Alcator C-Mod Run 1110309 Information

Miniproposals

Miniproposal: 655

Date Filed: 2/7/2011

Title: Characterization of WCM behavior and estimates of transport at the edge

First Author: Arturo Dominguez

Session Leader: Arturo Dominguez (shots 1-34)

Operators
Session leader(s):	Arturo Dominguez
Physics operator(s):	Greg Wallace
Engineering operator(s):	Bill Cochran,Bill Parkin,Bill Byford

Engineering Operator Run Comment
MP655:Characterization of WCM behavior and estimates of transport at the

Session Leader Plans

Entered: Mar 8 2011 09:11:54:257PM

Author: Arturo Dominguez

1110309
SL-plan for run:1110309
MP655:Characterization of WCM behavior and estimates of transport at the edge
SL: Dominguez
PO: Wallace

The objective of this MP is to study the relationship between the characteristics of the weakly coherent mode (WCM) and the energy and particle transport at the edge of the plasma as well as the WCM dependence on edge temperature and pressure gradients.

The use of various fluctuation diagnostics, mainly: O-mode reflectometry, GPI, PCI, fast magnetics and FRCECE, will be used to study the different characteristics of the WCM.

The experiment will focus on reproducing long sustained I-modes at 4 different (nl04,Ip) values during which the ICRF power will be stepped in order to modify the temperature and pressure gradients close to the LCFS.

The solicited diagnostic set is:
O-mode fixed reflectometry
Core and Edge Thomson
PCI (no masking)
Fast magnetics
GPI
FRCECE
X-mode SOL reflectometer
H(alpha) GPI camera set for profile measurements. To be used for particle transport analysis.
CXRS
HIREX Sr
HIREX Jr

If possible, it is asked for fluctuation diagnostics to connect the global timing signal for post-run analysis.

In order to optimize GPI fluctuation diagnostic, He puffing will be used. This is also compatible with the D(alpha) GPI camera. For this, set:
NINJA at 10psi in He^4

We plan to use 2-4 shots (depending on the run progress) to run MP#656, this will consist of repeating good I-mode shots using D2 instead of He puffing for which 2 cell accesses are required: one before the D2 shot and one after (to switch back).

The SOL-reflectometry system requires the LHRF antenna to be positioned at 1mm.

Run plan for 1110309xxx:

For all shots that follow, neon seeding will be used to try to control disruptions. For (1), use the same neon puff as in the target shot 1110215023

1) 3 shots:
Reproduce shot 1110215023 but with faster density and current ramps (flattop by 0.5s) to nl04=0.9E20m^-2 and Ip=1.2MA and ICRF power scan as described in the MP:
- At ~0.5s ramp ICRF:0-3MW during 200ms
- Ramp the PICRF from 3-5MW from 0.7-1.7s and determine the P(I-H)

2) 3 shots:
Using the recipe developed in (1), scan the ICRF power in 100ms steps from P(L-I) to right below the P(I-H)
and then step back down to below the P(L-I) (this step assumes some level of hysteresis). Refer to figure 1 attached.

**) 1 shot: LM calibration for Hirex Sr. use shot 1110216003 as reference.
(This in order to ensure proper Hirex Sr. alignment)

3a)Repeat 1) and 2) with nl04=1.1E20m^-2 and Ip=1.2MA. For this case, ICRF power will be scanned as:
- At ~0.5s ramp ICRF:0-3.5MW during 100ms
- Ramp the PICRF from 3.5-5.5MW from 0.6-1.6s and determine the P(I-H)

3b)Repeat 1) and 2) with nl04=0.7E20m^-2and Ip=1.0MA (reference 1110215017 if needed). For this case, ICRF power will be scanned as:
- At ~0.5s ramp ICRF:0-2MW during 100ms
- Ramp the PICRF from 2-4MW from 0.6-1.6s and determine the P(I-H)

3c)Repeat 1) and 2) with nl04=1.0E20m^-2 and Ip=1.0MA. For this case, ICRF power will be scanned as:
- At ~0.5s ramp ICRF:0-3MW during 100ms
- Ramp the PICRF from 3-5MW from 0.6-1.6s and determine the P(I-H)

Note that for each (ne,Ip) case we will try to repeat a good I-mode shot with a change of gas puffing to D2 in order to get a comparison for MP#656 (which will be very useful for post-analysis). This will comprise of a cell access before the shot and one after.

Physics Operators Plans

Entered: Mar 9 2011 08:12:54:557AM

Author: Greg Wallace

Engineering setup for Wednesday, March 9, 2011

MP655: Characterization of WCM behavior and estimates of transport at the edge

Session leader: A. Dominguez
Physics operator: G. Wallace

Overnight: standard ECDC in D2 and 60 C bake.

Run will start at 09:00 and end at 17:00

Power systems as on: 1110216003 (0.8 MA, 5.4 T reverse field, LSN)

A-coil configuration: -Dtop +Dbot +Jtop -Jbot; Hybrid enabled (standard
configuration for reversed field)

Gas Setup:
fill B-Top with 6 psi D2 Hybrid enabled (PG4)
fill B-side lower with 2 psi Ne Hybrid DISABLED (PG1)
leave B-side upper as is Hybrid DISABLED (PG2)
fill B-main (C-side) with 40 psi D2 Hybrid enabled (PG3)
fill H-bottom with 1 psi Ar Hybrid enabled (PG5)
fill NINJA with 10 psi He4

Enable the following gate valves and shutters, assuming no vacuum problems:
ECE, VUV, Z-bolo, HIREX-Sr, B-spectrometer GV

Torvac setup: keep gate valves open during pulse

Specific diagnostics:
O-mode fixed reflectometry
Core and Edge Thomson
PCI (no masking)
Fast magnetics
GPI
FRCECE
X-mode SOL reflectometer
H(alpha) GPI camera set for profile measurements. To be used for particle transport analysis.
CXRS
HIREX Sr
HIREX Jr

------------------------------------------------------------------------------
Boronization: no
Impurity injector: no
ICRF: yes, P <= 6 MW
LH: no
DNB: yes
Cryopump: no
------------------------------------------------------------------------------

Run plan: Start with locked mode calibration shot 1110216003 for HIREX.
Move on to reproduce I-mode shots (ref 1110216023) at nl_04=.7-1.1e20 and Ip=1-1.2MA.

Session Leader Summaries

Entered: Mar 10 2011 03:00:28:907PM

Author: Arturo Dominguez

1110309
MP655:Characterization of WCM behavior and estimates of transport at the edge
SL: Dominguez
PO: Wallace

The run was difficult due to the numerous disruptions. Nonetheless, several good I-mode shots were achieved for these conditions:

Shots 7 and 9 at
nl04=0.7-0.93
Ip=1.2
ICRF= 2.7-4.58

Shots 22, 24, (25), (26) at
nl04=0.65-0.8 (0.71 steady for 24,25,26)
Ip=1.0
ICRF= 2.84-3.2

Shots 32,(34)
nl04=0.7-0.91
Ip=1.1
ICRF= 2.3-4.5

Shot 33
Similar to 32 and 34 (but only at ICRF =4.5MW)

Shots 25,26 and 34 use D2 GPI for comparison (MP#656) (25 and 26 compare to 24 and 34 compare to 32)

There was little obvious hysteresis seen in the WCM characteristics when the power went below the P(L-I) so for the last I-mode shots (32-34) the steps where lengthened and the low power steps eliminated.

There were difficulties running above 1MA without disrupting, but the 1MA shots at nl04>0.8 were not going into I-mode (even at powers above 4MW) This is an interesting density threshold.

D-alpha camera measurements, at first glance, look good: good signal center/signal edge ratio and decent initial profiles. In depth analysis must be performed.

Finally, there were issues with edge TS reported by jwhughes. Repercussions of the data will have to be seen post run but Jerry reports that it might be salvageable.

Physics Operator Summaries

Entered: Mar 9 2011 05:19:09:320PM

Author: Greg Wallace

Run summary from 1110309
Physics Operator: G. Wallace
Session Leader: A. Dominguez
MP655: Characterization of WCM behavior and estimates of transport at the edge

Today's run was plagued by disruptions. After 3 gas-puff test shots and one dud due to EF1L, we finally got our first plasma on shot 5. A total of 15 disruptions during the day. Most seem to be due to Mo injections, although one was probably from an (intentional) locked mode.

Ne puffing was used all day to prevent injections during ICRF. Despite this there were fatal or nearly fatal injections on many shots. Avoiding the bottom tile of the outer divertor while sweeping the strike point along the middle tiles of the outer divertor seemed to help keep the late distruptions at bay. See shot 24 for RXL sweep programming.

Increasing the length and height of the seg1 PG3 puff around t=0 seemed to help reduce the number of early disruptions. Thanks to Ian Hutchinson for the suggestion.

Session Leader Comments

Mar 9 2011 09:19:03:957AM 1110309004 Arturo Dominguez First shot from part (1)
nl04=0.9
Ip=1

P(ICRF) ramp to try to determine P(L-I) and P(I-H)

Result:Dud, where's my plasma?

Mar 10 2011 09:09:01:377AM 1110309005 Arturo Dominguez second attempt from part (1)
nl04=0.9
Ip=1.2

P(ICRF) ramp to try to determine P(L-I) and P(I-H)

Result:
Plasma
disrupts at ~1.41

next: try again
change Bt to 5.8T
lower nl04 to try to stay at 0.9

Mar 10 2011 11:17:06:017AM 1110309006 Arturo Dominguez nl04=0.9
Ip=1.2

P(ICRF) ramp to try to determine P(L-I) and P(I-H)

Result:
Plasma
disrupts at ~0.31s

next: try again

Mar 10 2011 10:21:46:440AM 1110309007 Arturo Dominguez nl04=0.9
Ip=1.2

P(ICRF) ramp to try to determine P(L-I) and P(I-H)

Result:
I-Mode goes in at ~0.65 at P(ICRF)~2.7MW

next: Try to get to the P(I-H) so ramp the ICRF faster (3-5MW @ 0.7-1.25s)

Mar 9 2011 11:30:32:937AM 1110309008 Arturo Dominguez nl04=0.9
Ip=1.2

P(ICRF) ramp to try to determine P(L-I) and P(I-H)

Result:
Disruption at 0.64

next: Repeat shot 007 (less agressive that 008) to try to get to a P(I-H) (or a max P(ICRF) before disruption)

Mar 9 2011 11:00:57:843AM 1110309009 Arturo Dominguez There's an extended cell access after shot 9 to fix a problem with edge TS

Mar 10 2011 10:22:34:003AM 1110309009 Arturo Dominguez nl04=0.9
Ip=1.2

P(ICRF) ramp to try to determine P(L-I) and P(I-H)

Result:
I-Mode goes in at ~0.64 at P(ICRF)~2.4MW

next: Assuming Pmax~4.5MW, move to (2) using P(L-I)=2.7MW

Mar 10 2011 10:44:41:230AM 1110309010 Arturo Dominguez Move on to part 2: Use RF steps

nl04=0.9
Ip=1.2

P(ICRF) ramp to try to determine P(L-I) and P(I-H)

Result:
Early Disruption (0.6s)

next:
Move to Ip=1.0MA

Mar 9 2011 12:00:18:637PM 1110309011 Arturo Dominguez
nl04=0.9
Ip=1

P(ICRF) ramp to try to determine P(L-I) and P(I-H)

Result:
Disruption

next:
Try again

Mar 9 2011 12:00:53:667PM 1110309012 Arturo Dominguez
nl04=0.9
Ip=1

P(ICRF) ramp to try to determine P(L-I) and P(I-H)

Result:
Good ramp but no I-mode

next:
Try again but with P(ICRF) going up to 5MW

Mar 9 2011 12:33:29:957PM 1110309013 Arturo Dominguez nl04=0.9
Ip=1

P(ICRF) ramp to try to determine P(L-I) and P(I-H)

Increase the max ICRF power to 5MW

Result:
Good plasma no good I-mode

next:
decrease the target density

Mar 9 2011 12:32:40:013PM 1110309014 Arturo Dominguez nl04=0.8
Ip=1

P(ICRF) ramp to try to determine P(L-I) and P(I-H)

still try to ramp. reduce density from 0.9 to 0.8

Result:
Good plasma no good I-mode

next:
decrease the Ne puff

Mar 9 2011 12:40:49:007PM 1110309015 Arturo Dominguez nl04=0.8
Ip=1

P(ICRF) ramp to try to determine P(L-I) and P(I-H)
Decrease the ne puff to try to maintain the density low. Hopefully we can go into I-mode this way

Result:
Good plasma...super clear RF..no I-mode, which is problematic for an I-mode experiment

next:
Increase Ip to 1.1MA
increase Ne to like shot 013

Mar 9 2011 12:57:30:187PM 1110309016 Arturo Dominguez nl04=0.8
Ip=1.1

P(ICRF) ramp to try to determine P(L-I) and P(I-H)

Increase Ip to 1.1

Result:
Disruption right before it reaches Ip flattop

next:
Decrease the current slightly, decrease the Ne slightly

Mar 9 2011 01:16:49:697PM 1110309017 Arturo Dominguez nl04=0.8
Ip=1.05

P(ICRF) ramp to try to determine P(L-I) and P(I-H)

Repeat with Ip=1.05

Result:
Disruption at 0.56s

next:
Going back to the one case that worked well: shot 009

Mar 9 2011 01:30:13:860PM 1110309018 Arturo Dominguez nl04=0.9
Ip=1.2

Try to go back to our only condition with I-mode

Result:
Disruption at ~0.69

next:
It looks like we're in a rough spot. At high current (>1MA) it's disrupting, at 1MA it doesn't want to go into I-mode.
We'll go down in Ip to repeat shot 15 but reduce the density more (to make it more similar to Dennis' 1MA shots)

Mar 9 2011 01:37:49:633PM 1110309019 Arturo Dominguez nl04=0.7
Ip=1.0

Go back to Ip=1.0 but reduce the density to nl05~0.7

Result:
Disrupt at 0.23

next:
We'll load exactly shot 17 from Dennis' run

Mar 9 2011 01:51:45:210PM 1110309020 Arturo Dominguez Reload shot 1110215017 from Dennis' run

Result:
Disrupt at 0.55

next:
Increase the early density and increase the lower triangularity to move the strike point

Mar 9 2011 02:09:14:510PM 1110309021 Arturo Dominguez Try to reload shot 17 from Dennis' run but modify triangularity and density to try to move away from the danger zone

Result:
Ip reached 0.67 and then decreased and disrupted

next:
Take all suggestions from Dennis and Ian and do that.

Mar 9 2011 02:29:41:513PM 1110309022 Arturo Dominguez Modified shot 1110215017

Result:
Good plasma and an I-mode

next:
Take this as a scan and do the steps with P(low)=2.2 and P(high)=4.5
sweep the lower triangularity through the shot to scan the outer strike point.

Mar 9 2011 02:36:56:510PM 1110309023 Arturo Dominguez Steps for this (nl04,Ip) condition

Result:
Disruption at 0.588s

next:
Rinse and repeat

Mar 9 2011 02:49:30:150PM 1110309024 Arturo Dominguez Steps for this (nl04,Ip) condition

Result:
Good shot, good I-mode...keeper

next:
Ninja switch to D2 and repeat

Mar 9 2011 03:07:43:147PM 1110309025 Arturo Dominguez Steps for this (nl04,Ip) condition
Ninja Switch to D2

Result:
Full shot. I-mode present. Little signal on GPI

next:
Repeat for more GPI measurements

Mar 9 2011 03:46:37:720PM 1110309026 Arturo Dominguez Steps for this (nl04,Ip) condition
2nd shot Ninja Switch to D2

Result:
Full shot. I-mode throughout the steps

next:
LM shot

Mar 9 2011 03:47:19:583PM 1110309027 Arturo Dominguez LM for Hirex

Result:
Disrupted too early

next:
try again

Mar 9 2011 03:49:05:657PM 1110309028 Arturo Dominguez 2nd LM for Hirex

Result:
best LM in 2 weeks

next:
Go back to the good I-mode shots of 26 and before but increase the max P(ICRF), steady the nl04 throughout the I-mode and increase the ICRF step sizes sacrificing the P(ICRF)

Mar 9 2011 04:08:01:570PM 1110309029 Arturo Dominguez Go back to the good I-mode shots of 26 and before but increase the max P(ICRF), steady the nl04 throughout the I-mode and increase the ICRF step sizes sacrificing the P(ICRF)

Result:
Density ramped up during the RF phase making the RF trip...why?

next:
repeat

Mar 9 2011 04:25:39:463PM 1110309030 Arturo Dominguez Repeat shot 29 hoping the density is better controlled. The PO says it's not his fault...the SL is not so sure

Result:

Density is still rising during the RF phase

next:
Increase Ip to 1.1MA

Mar 9 2011 04:33:05:100PM 1110309031 Arturo Dominguez Ip=1.1MA shot

Result:

Disruption at ~0.6s. Jury says it's a LM

next:
Increase target nl_04 to 0.8

Mar 9 2011 04:50:40:427PM 1110309032 Arturo Dominguez Ip=1.1MA
nl04=0.8

Same ICRF steps are being used as for shot 29.

Result:
Good plasma...I-mode (not great RF)

next:
Repeat

Mar 9 2011 05:01:51:293PM 1110309033 Arturo Dominguez Ip=1.1MA
nl04=0.8

Repeat of shot 32

Result:
Good plasma...looks like a brief I-mode at the high ICRF step

next:
Repeat with Ninja change to D2

Mar 9 2011 05:10:21:473PM 1110309034 Arturo Dominguez Ip=1.1MA
nl04=0.8

Repeat of shot 33 with D2

Result:
Good shot, I-mode until it disrupts at ~1.42s

End of Run. Thanks everyone!

Physics Operator Comments

Mar 9 2011 09:02:30:770AM 1110309001 Greg Wallace Load seg 1 from seg 1 of 1110218015 (2011 rev B non-cryo startup)
Load seg 2 from seg 2 of 1110215023 (2011 rev B 1.2MA 5.4T LSN)
Load seg 3 from seg 2 of 1110216003 (0.8MA rev B locked mode) SEGMENT OFF

Changes:
Move Ip flattop to 0.5 s.
Move nl_04 flattop to 0.5 s. Keep nl_04 setpoint at 0.9e20 after 1.0 s (was negative for t>1.0).

Result:
No power gas-puff test. Looks like PG3 might not be firing properly??? Hard to tell with DNB firing.

Next shot:
Repeat no power gas-puff test.

Mar 9 2011 09:10:15:540AM 1110309002 Greg Wallace Changes:
Repeat no power gas-puff test.

Result:
PG4 looks OK, no puff from PG3.

Next shot:
Repeat no power gas-puff test. Increase PG3 puff length. New start and end times of -.02 and +.05 s, at 100 for entire pulse.

Mar 9 2011 09:15:36:267AM 1110309003 Greg Wallace Changes:
Repeat no power gas-puff test. Increase PG3 puff length. New start and end times of -.02 and +.05 s, at 100 for entire pulse.

Result:
Got PG3 puff this time.

Next shot:
Will reduce PG3 back to "normal" level. Next shot will try for plasma.

Mar 9 2011 09:20:15:693AM 1110309004 Greg Wallace Changes:
Will reduce PG3 back to "normal" level (-.02 to +.04 s, 90 falling to 50). Next shot will try for plasma.

Result:
Dud. EF1L did not go.

Next shot:
Try again with EF1L.

Mar 9 2011 09:50:09:750AM 1110309005 Greg Wallace Changes:
Try again with EF1L.

Result:
Plasma. 5.4 T, 1.2 MA. PO error on TF program, next shot will go to 5.8 T (160 kA) as requested by SL.
Disruption at 1.4 s.

Next shot:
Increase TF current to 160 kA for 5.8 T.
Decrease nl_04 program to 8e19 during flattop.

Mar 9 2011 10:06:27:760AM 1110309006 Greg Wallace Changes:
Increase TF current to 160 kA for 5.8 T.
Decrease nl_04 program to 8e19 during flattop.

Result:
Disruption at 0.31 s. Looks like something fell in? Did not get 5.8 T.

Next shot:
Try again. Enable PG1 for Ne puff.

Mar 9 2011 10:27:09:103AM 1110309007 Greg Wallace Changes:
Try again. Enable PG1 for Ne puff.

Result:
Plasma. Disruption at 1.25 s. Hot spot in lower inner divertor on WIDE2.
Increase nl_04 to 0.9e20 to avoid k limiter heating.

Next shot:
Increase Ip ramp rate slightly to get flattop by 0.5 s.

Mar 9 2011 10:42:14:657AM 1110309008 Greg Wallace Changes:
Increase Ip ramp rate slightly to get flattop by 0.5 s.
Increase nl_04 to 0.9e20 to avoid k limiter heating.

Result:
Disruption at 0.6 s. Mo injection from limiter? ICRF only at 3 MW when disruption happens. No hot spot visible on WIDE2.

Next shot:
Increase PG5 Ar puff from 30 to 35 ms for HIREX-SR.
Decrease ICRF ramp rate.

Mar 9 2011 11:06:14:613AM 1110309009 Greg Wallace Changes:
Increase PG5 Ar puff from 30 to 35 ms for HIREX-SR.
Decrease ICRF ramp rate.

Result:
Full length plasma. K limiter still red hot. Long cell access for Jerry to investigate edge TS problem.
Yuri complains about lack of Ar, although he says 35 ms should be enough. Verified that PG5 is enabled.

Next shot:
Increase PG5 Ar puff to 50 ms. Also increase Ar plenum pressure from .75 to 1.25 psi.

Mar 9 2011 11:30:43:627AM 1110309010 Greg Wallace Changes:
Increase PG5 Ar puff to 50 ms. Also increase Ar plenum pressure from .75 to 1.25 psi.

Result:
Disruption at 0.6 s. Injection just before 0.6 s. More Mo.
Another long cell access for Jerry to investigate edge TS. Still no dice on that.

Next shot:
Go to lower current (1.0 MA).

Mar 9 2011 11:45:07:357AM 1110309011 Greg Wallace Changes:
Go to lower current (1.0 MA).

Result:
Disruption at 0.25 s. Never diverted. ICRF did not cause this disruption.

Next shot:
Try again.

Mar 9 2011 12:01:44:800PM 1110309012 Greg Wallace Changes:
None.

Result:
Full length plasma. Injection at 1.06 s. Mo again. Matt says most likely from E-port area.

Next shot:
Repeat with more ICRF.

Mar 9 2011 12:18:20:257PM 1110309013 Greg Wallace Changes:
Repeat with more ICRF.

Result:
Disruption in rampdown at 600 kA. Density increases during ICRF from 0.9 to 1.2e20.

Next shot:
Reduce nl_04 setpoint to 0.8e20.

Mar 9 2011 12:29:55:710PM 1110309014 Greg Wallace Changes:
Reduce nl_04 setpoint to 0.8e20.

Result:
Plasma, disrupts in rampdown at 600 kA. Density is still overshooting. No puffing during the ICRF so not much I can do about it.

Next shot:
Reduce Ne chopper voltage from 100 to 70. Keep Ne pulse length the same.

Mar 9 2011 12:41:38:640PM 1110309015 Greg Wallace Changes:
Reduce Ne chopper voltage from 100 to 70. Keep Ne pulse length the same.

Result:
Disruption at 1.35 s. A few injections prior to the disruption. ICRF is happy, plasma is not.

Next shot:
Increase Ne chopper back to 100.
Increase Ip flattop to 1.1 MA.

Mar 9 2011 12:57:48:643PM 1110309016 Greg Wallace Changes:
Increase Ne chopper back to 100.
Increase Ip flattop to 1.1 MA.

Result:
Disruption at 0.51 s. Mo injection again.

Next shot:
Reduce Ip to 1.05 MA.
Reduce Ne chopper to 70.

Mar 9 2011 01:16:04:603PM 1110309017 Greg Wallace Changes:
Reduce Ip to 1.05 MA.
Reduce Ne chopper to 70.

Result:
Disruption at 0.57 s this time.

Next shot:
Go back to 1.2 MA to see if we can repeat shot 9.

Mar 9 2011 01:28:58:847PM 1110309018 Greg Wallace Changes:
Go back to 1.2 MA to see if we can repeat shot 9.

Result:
Disruption at 0.69 s.

Next shot:
Reduce Ip from 1.2 MA to 1.0 MA.
Reduce nl_04 from 8e19 to 7e19.

Mar 9 2011 01:37:58:337PM 1110309019 Greg Wallace Changes:
Reduce Ip from 1.2 MA to 1.0 MA.
Reduce nl_04 from 8e19 to 7e19.

Result:
Disruption at 0.22 s.

Next shot:
Load seg 2 of 1110215017 into seg 2 (active segment). Will be 1.0 MA with slightly different upper triangularity. Dennis thinks this might help with I-mode formation.

Mar 9 2011 01:52:52:373PM 1110309020 Greg Wallace Changes:
Load seg 2 of 1110215017 into seg 2 (active segment). Will be 1.0 MA with slightly different upper triangularity. Dennis thinks this might help with I-mode formation.

Result:
Disruption at 0.56 s.

Next shot:
Extend seg 1 PG3 puff end from 40 ms to 70 ms.
Reduce RXL by 2mm across shot.

Mar 9 2011 02:09:30:420PM 1110309021 Greg Wallace Changes:
Extend seg 1 PG3 puff end from 40 ms to 70 ms.
Reduce RXL by 2mm across shot.

Result:
Disruption at 0.25 s.

Next shot:
Increase seg 1 PG3 puff out to 80 ms. Also increase PG3 height from 50 to 70.

Mar 9 2011 02:27:46:937PM 1110309022 Greg Wallace Changes:
Increase seg 1 PG3 puff out to 80 ms. Also increase PG3 height from 50 to 70.

Result:
Plasma disrupts at 1.24 s. Mo injections at 0.6 and 1.2 s.

Next shot:
Reduce magnitude of RXL sweep by 2mm.
Increase Ar puff to 50 ms.
ICRF will be with Arturo's stepped scheme.

Mar 9 2011 02:38:49:033PM 1110309023 Greg Wallace Changes:
No DPCS changes.
ICRF will be with Arturo's stepped scheme.

Result:
Disruption at 0.59 s. Changes in RXL program were all after 0.6 s.

Next shot:
Repeat and hope for better results.

Mar 9 2011 02:55:58:677PM 1110309024 Greg Wallace Changes:
Repeat and hope for better results.

Result:
Plasma all the way through rampdown! And an I-mode! Cell access for GPI filter change from He to D.

Next shot:
Repeat with D NINJA puff.

Mar 9 2011 03:07:20:350PM 1110309025 Greg Wallace Changes:
Repeat with D NINJA puff.

Result:
Plasma.

Next shot:
Repeat for GPI measurement.

Mar 9 2011 03:22:03:007PM 1110309026 Greg Wallace Changes:
Repeat for GPI measurement.

Result:
Plasma, all the way through rampdown. Got GPI data.

Next shot:
Switching to locked mode from 1110216003. Seg 2 off, seg 3 on.
Change PG5 Ar puff to 150 ms in seg 3.

Mar 9 2011 03:34:48:203PM 1110309027 Greg Wallace Changes:
Switching to locked mode from 1110216003. Seg 2 off, seg 3 on.
Change PG5 Ar puff to 150 ms in seg 3.

Result:
Locked mode. Disruption at 0.54 s.

Next shot:
Reduce Ar puff (PG5) to 120 ms. Turn off Ne puff (PG1). Try again.

Mar 9 2011 03:49:11:670PM 1110309028 Greg Wallace Changes:
Reduce Ar puff to 120 ms. Try again.

Result:
Plasma into rampdown. Got locked mode.

Next shot:
Segment 3 off, segment 2 on.
Reload shot 26 from today.
Keep nl_04 steady at 7e19 after 1.0 s.

Mar 9 2011 04:06:57:530PM 1110309029 Greg Wallace Changes:
Segment 3 off, segment 2 on.
Reload shot 26 from today.
Keep nl_04 steady at 7e19 after 1.0 s.

Result:
Plasma. D-port tripped out. Density is higher than on shot 26, well above demand during ICRF pulse.

Next shot:
Repeat, cross fingers density does not rise as much during ICRF...

Mar 9 2011 04:23:04:873PM 1110309030 Greg Wallace Changes:
Repeat, cross fingers density does not rise as much during ICRF...

Result:
Plasma. Density is still not well controlled but there is no gas puffing. Maybe NINJA puff is partly responsible? My suspicion is that the ICRF may be the culprit.

Next shot:
Increase to 1.1 MA.

Mar 9 2011 04:32:44:167PM 1110309031 Greg Wallace Changes:
Increase to 1.1 MA.

Result:
Disruption at 0.59 s. Locked mode disruption?

Next shot:
Increase nl_04 from 7 to 8e19.

Mar 9 2011 04:45:02:330PM 1110309032 Greg Wallace Changes:
Increase nl_04 from 7 to 8e19.

Result:
Plasma into rampdown. ICRF tripped a few times.

Next shot:
Repeat.

Mar 9 2011 05:02:04:493PM 1110309033 Greg Wallace Changes:
Repeat.

Result:
Plasma. Disruption in rampdown at 400 kA.

Next shot:
Repeat with D NINJA puffing for GPI.

Mar 9 2011 05:11:34:240PM 1110309034 Greg Wallace Changes:
Repeat with D NINJA puffing for GPI.

Result:
Plasma. Last shot of the day.

Engineering Operator Comments

Shot Time Type Status Comment

1 08:56:43:593AM Test Bad Gas Test

2 09:02:54:223AM Test Bad Gas Test

3 09:09:37:750AM Test Ok Gas Test

4 09:16:24:050AM Plasma Bad EF1L did not fire

5 09:33:34:477AM Plasma Ok Plasma

6 09:54:19:597AM Plasma Ok

7 10:06:48:470AM Plasma Ok

8 10:27:03:200AM Plasma Ok

9 10:43:10:010AM Plasma Ok

10 11:07:24:620AM Plasma Ok

11 11:32:25:630AM Plasma Ok

12 11:45:36:140AM Plasma Ok

13 12:06:30:420PM Plasma Ok

14 12:19:02:933PM Plasma Ok

15 12:32:34:413PM Plasma Ok

16 12:47:30:203PM Plasma Ok

17 01:00:19:597PM Plasma Ok

18 01:16:59:030PM Plasma Ok

19 01:29:37:173PM Plasma Ok

20 01:42:10:950PM Plasma Ok

21 01:54:43:860PM Plasma Ok

22 02:12:59:793PM Plasma Ok

23 02:28:11:690PM Plasma Ok

24 02:40:43:287PM Plasma Ok

25 02:59:37:360PM Plasma Ok

26 03:12:06:487PM Plasma Ok

27 03:27:59:417PM Plasma Ok

28 03:40:32:520PM Plasma Ok

29 03:58:25:657PM Plasma Ok

30 04:12:04:310PM Plasma Ok

31 04:25:45:380PM Plasma Ok

32 04:38:34:397PM Plasma Ok

33 04:52:12:497PM Plasma Ok

34 05:06:30:173PM Plasma Ok

System Availability

Mar 9 2011 08:56:28:060AM

System Available Comment Availability
Changed Owner Description Who Can
Change
Active MHD no secured - tagged out Jun 02 2008 11:03AM (sears) Joe Snipes Active MHD Antenna sears,snipes
BES yes BES system is online Oct 21 2010 11:33AM (bespam) Bill Rowan Beam Emission Spectroscopy bespam,liao,rowan
Bolometers yes 2pi (D+F) working. All midplane and off-midplane diode arrays working except WB1AX. Midplane foils calibrated and PRAD_MAIN is being filled. Divertor/Ledge foils not yet ready. Jul 15 2010 08:27AM (mlreinke) Matt Reinke Bolometers hutch,mlreinke
Boronization yes Nov 16 2010 02:36PM (dekow) Jim Irby Boronization dekow,irby
CNPA yes Multiple channel CNPA available Oct 21 2010 07:11PM (parker) Ron Parker Compact Neutral Analyzer parker
Cryopump - Upper Divertor no Shut down. Helium dewar removed. LN2 manual valve and solenoid valves are closed and tagged. Apr 06 2010 10:51AM (labombard) Brian LaBombard Upper Divertor Cryopump irby,labombard
CXRS yes Wide-view CXRS system is online Oct 21 2010 11:33AM (bespam) Bill Rowan Charge Exchange Spectroscopy bespam,blip,liao,rachmcd,rowan
D Alpha yes \ha2_bright is available; \SPECTROSCOPY::TOP.VUV.VIS_SIGNALS:MCP_VIS_SIG1 is not available Jul 01 2009 09:45AM (terry) Jim Terry Balmer Alpha Monitor irby,terry,wolfe
Dalsa yes system is aligned; new calibrations (relative brightness and position) not yet implemented Jun 29 2010 10:27AM (marmar) Earl Marmar Visible Bremsstrahlung marmar
Disruption Mitigation yes operational, but turned off Nov 03 2009 04:59PM (granetz) Robert Granetz Gas Jet granetz,whyte
Divertor IR no Mar 06 2007 10:50AM Glen Wurden Divertor IR Digital Video gwurden,terry
Divertor IR Spectroscopy no Mar 06 2007 10:51AM Glen Wurden Divertor IR Spectroscopy gwurden,terry
DNB no in test mode only Nov 03 2009 05:01PM (granetz) Robert Granetz Diagnostic Neutral Beam dterry,granetz,gung
ECDC yes Operational Jun 26 2010 09:28PM (irby) Jim Irby 2.45 GHz, 3 kW, discharge cleaning system dekow,irby,pfeiffer
FRC-ECE yes All channels working and calibrated. Oct 27 2010 03:41PM (phillips) Perry Phillips Heterodyne ECE-32 channels phillips
G-Side Ratiomatic yes Gauges are operational. Jun 28 2010 08:02PM (labombard) Brian LaBombard G-side ratiomatic ionization gauge labombard,toland
Glow Discharge no Plugs for Power Supply and Controls have been unplugged and red tagged making system safe for In-Vessel Access. Apr 05 2010 11:18AM (dekow) Jim Irby 1 kV, 5 A, glow discharge system dekow,dterry,irby
GPC yes Operational. Jul 28 2009 04:23PM (hubbard) Amanda Hubbard ECE Polychromater hubbard,schmidt
GPC2 yes Most channels operational. Oct 22 2010 11:46AM (hubbard) Amanda Hubbard ECE Polychromater hubbard,schmidt
GPI yes The Xpt-view, the midplane-view cameras are operational. The innerwall GPI (coupled to the fast-diodes) is available. Jul 01 2009 09:45AM (terry) Jim Terry Gas Puff Imaging terry,zweben
H/D yes operating normally Jun 29 2010 10:26AM (marmar) Earl Marmar H/D Ratio marmar
HEAT yes Jun 26 2010 11:19PM (dekow) Gary Dekow - Machine Heaters - burke,dekow
Hirex Jr yes Hirex-Jr has been installed Jun 28 2010 03:36PM (rice) John Rice High Resolution X-Ray ince,rice
Hirex Sr yes System installed and aligned. Inverted Profiles for Ti are available upon request. Vtor profiles still under revision. Dec 17 2010 09:25AM (ypodpaly) John Rice High Resolution X-Ray ince,rice,ypodpaly
HXR yes 32 Channels operational Oct 23 2010 01:41PM (parker) Ron Parker Hard X-Ray Array faust,parker,schmidt
ICRF D-Antenna yes system checked out ok on 11006728. Jun 28 2010 04:57PM (ylin) Steve Wukitch D-port antenna wukitch,ylin
ICRF E-Antenna yes system checked out ok on 1100628 Jun 28 2010 04:57PM (ylin) Steve Wukitch E-port antenna wukitch,ylin
ICRF J-Antenna yes system checked out ok. conditioned to vacuum. Jun 28 2010 04:58PM (ylin) Steve Wukitch J-port antenna wukitch,ylin
Laser Blow-Off yes operational and tested Jul 20 2010 04:42PM (g) Martin Greenwald Impurity Injection System g,nthoward
Lower Hybrid yes LH working. New directional couplers installed at input to each klystron. Oct 21 2010 11:42AM (dterry) Ron Parker Lower Hybrid dterry,parker,wallaceg
Lower Hybrid Reflectometer yes 50GHz: up-, 60 GHz up- and down- Oct 21 2010 11:31AM (sgbaek) Arturo Dominguez Lower Hybrid Reflectometer dominguez,marmar,parker,sgbaek
Lower Hybrid SOL reflectometer yes profiles and fluctuations both working. If requested, please request LH launcher to be moved in. Jan 18 2011 03:07PM (cornwall) Cornwall Lau Lower Hybrid SOL reflectometer cornwall,wukitch,ylin
LPI no Beam line removed May 30 2008 02:09PM (bose) Earl Marmar Lithium Pellet Injector bose,marmar
Ly-alpha no WB4LY and LLY working but not during ICRF. WB1LY not attached due to pickup problems. LYMID attached but have profile problems. Aug 24 2010 09:17AM (mlreinke) Matt Reinke Lyman alpha cameras labombard,mlreinke
McPherson yes Spectra being collected and tree filled. Wavelength scan is broken so fixed on the Mo XXXI and XXXII lines. Jul 15 2010 08:28AM (mlreinke) Jim Terry VUV Spectrometer mlreinke,terry
Michelson yes Operational. Oct 22 2010 11:46AM (hubbard) Amanda Hubbard ECE Te Profiles hubbard,schmidt
MKS yes Gauges are operational Jun 28 2010 08:02PM (labombard) Brian LaBombard Baratron pressure gauges labombard
MLP no System is in edge lab. Version 2 drivers ready to test. Needs a student to help work on it. Jul 14 2009 09:20PM (labombard) Brian LaBombard Mirror Langmuir Probe Electronics System labombard
MSE no As of 6/10/09, MSE is calibrated & ready to go. Awaiting DNB. Jun 10 2009 10:34AM (sscott) Steve Scott Motional Stark Effect jinseok,sscott
Neutrons yes All systems are on and functional Jun 29 2010 12:56PM (fiore) Catherine Fiore Neutron Detectors fiore
Neuts and Hards yes PMT Neuts_hards, ssd_x01, ssd_x02, ssd_x03 Jun 26 2010 09:21PM (irby) Jim Irby X-Ray/Neutron Detectors at K-Hor irby
NINJA no Capillaries tested in-vessel. Jun 28 2010 08:08PM (labombard) Brian LaBombard NINJA gas puff labombard,terry
PCI yes Operational. AM (2 * 39.51) MHz. Dec 13 2010 05:29PM (ntsujii) Miklos Porkolab Phase Contrast Imaging ennever,ntsujii,porkolab
Penning Gauges no High voltage power supplies are turned off, waiting for work at A-port horizontal to be finished. Jun 28 2010 08:07PM (labombard) Brian LaBombard Penning Ionization Gauges labombard
Plasma TV yes WIDE1, WIDE2 (chan 33), DANT, JANT and DIV are operational. Jul 01 2009 09:46AM (terry) Jim Terry Video of plasma via several cameras dekow,irby,terry,wolfe
Polarimeter no Safe for Machine Entry Sep 14 2007 12:17PM (irby) Jim Irby C-Mod Polarimeter irby
Power - Alternator Air Switch yes Jun 26 2010 11:19PM (dekow) Gary Dekow feeds all the other supplies cochran,dekow,dterry,irby
Power - PEI yes Jun 26 2010 11:19PM (dekow) Gary Dekow PEI System cochran,dekow,dterry,irby
Power - TMX yes Jun 26 2010 11:19PM (dekow) Gary Dekow Ef2s,. EFCs and A-Coils byford,cochran,dekow,dterry,irby
Power Systems yes Jun 26 2010 11:20PM (dekow) Jim Irby C-Mod Magnet Supplies byford,cochran,dekow,dterry,irby
Probe Array - ISD yes Operational. Jun 28 2010 08:03PM (labombard) Brian Labombard Inner Lower Divertor Probe Array labombard
Probe Array - LH yes Operational. Jun 28 2010 08:03PM (labombard) Brian LaBombard Lower Hybrid Probe Array labombard
Probe Array - OSD yes F and J outer divertor probes are operational. Jun 28 2010 08:04PM (labombard) Brian LaBombard Outer Lower Divertor Probe Array labombard
Probe Array - UDIV yes Operational, except probe#13 Jun 28 2010 08:04PM (labombard) Brian LaBombard Upper Divertor Probe Array labombard
Reflectometer no 1110216000 all waveguides disconnected to protect mixers Feb 16 2011 08:21AM (dominguez) Earl Marmar Reflectometer dominguez,marmar
Scanning Probe - ASP yes Operational. New Langmuir-Mach probe head installed. Jun 28 2010 08:05PM (labombard) Brian LaBombard A-Port Scanning Probe labombard
Scanning Probe - FSP yes Operational. Jun 28 2010 08:05PM (labombard) Brian LaBombard F-Port Scanning Probe labombard
Scanning Probe - WASP yes Both A and K units are operational. Coil polarity needs to be checked. Jun 28 2010 08:06PM (labombard) Brian LaBombard Inner Wall Scanning Probe labombard,nsmick
Sparker yes HV supply on, cable run to sparker at k-hor Jun 23 2010 02:41PM (irby) Jim Irby Field Emission Preionization for C-Mod dekow,irby,parkin
Surface Science Station yes SSS installed and leak tested. Oct 21 2010 11:31AM (ochoukov) Bruce Lipschultz Radially scanning probe located on K-port blip,ochoukov
TCI yes No new CO2 detector, so still missing edge channels Jun 23 2010 02:40PM (irby) Jim Irby Two-Color Interferometer irby,murray
TS - Core yes Operating with 2 lasers Oct 22 2010 01:06PM (jwhughes) Jerry Hughes Core Thomson scattering jwhughes,yma
TS - Edge yes Operational Jul 14 2010 11:54AM (jwhughes) Jerry Hughes Millimeter resolution edge Thomson scattering jwhughes,yma
Vispec no 350 and 670 nm, 4 spatial channels Nov 28 2007 09:58AM (agraf) Alex Graf Visible Spectrometer agraf
XEUS yes Raw spectra stored but not line brightness time histories are going into the tree yet. Jan 20 2011 10:45AM (mlreinke) Matt Reinke X-ray Extended Ultraviolet Spectrometer mlreinke
XTOMO yes Core system working. Edge system waiting for H-modes. Jul 01 2010 11:55AM (mlreinke) Bob Granetz X-Ray Tomography granetz,mlreinke

Session Leader Comments
Mar 9 2011 09:19:03:957AM	1110309004	Arturo Dominguez	First shot from part (1) nl04=0.9 Ip=1 P(ICRF) ramp to try to determine P(L-I) and P(I-H) Result:Dud, where's my plasma?
Mar 10 2011 09:09:01:377AM	1110309005	Arturo Dominguez	second attempt from part (1) nl04=0.9 Ip=1.2 P(ICRF) ramp to try to determine P(L-I) and P(I-H) Result: Plasma disrupts at ~1.41 next: try again change Bt to 5.8T lower nl04 to try to stay at 0.9
Mar 10 2011 11:17:06:017AM	1110309006	Arturo Dominguez	nl04=0.9 Ip=1.2 P(ICRF) ramp to try to determine P(L-I) and P(I-H) Result: Plasma disrupts at ~0.31s next: try again
Mar 10 2011 10:21:46:440AM	1110309007	Arturo Dominguez	nl04=0.9 Ip=1.2 P(ICRF) ramp to try to determine P(L-I) and P(I-H) Result: I-Mode goes in at ~0.65 at P(ICRF)~2.7MW next: Try to get to the P(I-H) so ramp the ICRF faster (3-5MW @ 0.7-1.25s)
Mar 9 2011 11:30:32:937AM	1110309008	Arturo Dominguez	nl04=0.9 Ip=1.2 P(ICRF) ramp to try to determine P(L-I) and P(I-H) Result: Disruption at 0.64 next: Repeat shot 007 (less agressive that 008) to try to get to a P(I-H) (or a max P(ICRF) before disruption)
Mar 9 2011 11:00:57:843AM	1110309009	Arturo Dominguez	There's an extended cell access after shot 9 to fix a problem with edge TS
Mar 10 2011 10:22:34:003AM	1110309009	Arturo Dominguez	nl04=0.9 Ip=1.2 P(ICRF) ramp to try to determine P(L-I) and P(I-H) Result: I-Mode goes in at ~0.64 at P(ICRF)~2.4MW next: Assuming Pmax~4.5MW, move to (2) using P(L-I)=2.7MW
Mar 10 2011 10:44:41:230AM	1110309010	Arturo Dominguez	Move on to part 2: Use RF steps nl04=0.9 Ip=1.2 P(ICRF) ramp to try to determine P(L-I) and P(I-H) Result: Early Disruption (0.6s) next: Move to Ip=1.0MA
Mar 9 2011 12:00:18:637PM	1110309011	Arturo Dominguez	nl04=0.9 Ip=1 P(ICRF) ramp to try to determine P(L-I) and P(I-H) Result: Disruption next: Try again
Mar 9 2011 12:00:53:667PM	1110309012	Arturo Dominguez	nl04=0.9 Ip=1 P(ICRF) ramp to try to determine P(L-I) and P(I-H) Result: Good ramp but no I-mode next: Try again but with P(ICRF) going up to 5MW
Mar 9 2011 12:33:29:957PM	1110309013	Arturo Dominguez	nl04=0.9 Ip=1 P(ICRF) ramp to try to determine P(L-I) and P(I-H) Increase the max ICRF power to 5MW Result: Good plasma no good I-mode next: decrease the target density
Mar 9 2011 12:32:40:013PM	1110309014	Arturo Dominguez	nl04=0.8 Ip=1 P(ICRF) ramp to try to determine P(L-I) and P(I-H) still try to ramp. reduce density from 0.9 to 0.8 Result: Good plasma no good I-mode next: decrease the Ne puff
Mar 9 2011 12:40:49:007PM	1110309015	Arturo Dominguez	nl04=0.8 Ip=1 P(ICRF) ramp to try to determine P(L-I) and P(I-H) Decrease the ne puff to try to maintain the density low. Hopefully we can go into I-mode this way Result: Good plasma...super clear RF..no I-mode, which is problematic for an I-mode experiment next: Increase Ip to 1.1MA increase Ne to like shot 013
Mar 9 2011 12:57:30:187PM	1110309016	Arturo Dominguez	nl04=0.8 Ip=1.1 P(ICRF) ramp to try to determine P(L-I) and P(I-H) Increase Ip to 1.1 Result: Disruption right before it reaches Ip flattop next: Decrease the current slightly, decrease the Ne slightly
Mar 9 2011 01:16:49:697PM	1110309017	Arturo Dominguez	nl04=0.8 Ip=1.05 P(ICRF) ramp to try to determine P(L-I) and P(I-H) Repeat with Ip=1.05 Result: Disruption at 0.56s next: Going back to the one case that worked well: shot 009
Mar 9 2011 01:30:13:860PM	1110309018	Arturo Dominguez	nl04=0.9 Ip=1.2 Try to go back to our only condition with I-mode Result: Disruption at ~0.69 next: It looks like we're in a rough spot. At high current (>1MA) it's disrupting, at 1MA it doesn't want to go into I-mode. We'll go down in Ip to repeat shot 15 but reduce the density more (to make it more similar to Dennis' 1MA shots)
Mar 9 2011 01:37:49:633PM	1110309019	Arturo Dominguez	nl04=0.7 Ip=1.0 Go back to Ip=1.0 but reduce the density to nl05~0.7 Result: Disrupt at 0.23 next: We'll load exactly shot 17 from Dennis' run
Mar 9 2011 01:51:45:210PM	1110309020	Arturo Dominguez	Reload shot 1110215017 from Dennis' run Result: Disrupt at 0.55 next: Increase the early density and increase the lower triangularity to move the strike point
Mar 9 2011 02:09:14:510PM	1110309021	Arturo Dominguez	Try to reload shot 17 from Dennis' run but modify triangularity and density to try to move away from the danger zone Result: Ip reached 0.67 and then decreased and disrupted next: Take all suggestions from Dennis and Ian and do that.
Mar 9 2011 02:29:41:513PM	1110309022	Arturo Dominguez	Modified shot 1110215017 Result: Good plasma and an I-mode next: Take this as a scan and do the steps with P(low)=2.2 and P(high)=4.5 sweep the lower triangularity through the shot to scan the outer strike point.
Mar 9 2011 02:36:56:510PM	1110309023	Arturo Dominguez	Steps for this (nl04,Ip) condition Result: Disruption at 0.588s next: Rinse and repeat
Mar 9 2011 02:49:30:150PM	1110309024	Arturo Dominguez	Steps for this (nl04,Ip) condition Result: Good shot, good I-mode...keeper next: Ninja switch to D2 and repeat
Mar 9 2011 03:07:43:147PM	1110309025	Arturo Dominguez	Steps for this (nl04,Ip) condition Ninja Switch to D2 Result: Full shot. I-mode present. Little signal on GPI next: Repeat for more GPI measurements
Mar 9 2011 03:46:37:720PM	1110309026	Arturo Dominguez	Steps for this (nl04,Ip) condition 2nd shot Ninja Switch to D2 Result: Full shot. I-mode throughout the steps next: LM shot
Mar 9 2011 03:47:19:583PM	1110309027	Arturo Dominguez	LM for Hirex Result: Disrupted too early next: try again
Mar 9 2011 03:49:05:657PM	1110309028	Arturo Dominguez	2nd LM for Hirex Result: best LM in 2 weeks next: Go back to the good I-mode shots of 26 and before but increase the max P(ICRF), steady the nl04 throughout the I-mode and increase the ICRF step sizes sacrificing the P(ICRF)
Mar 9 2011 04:08:01:570PM	1110309029	Arturo Dominguez	Go back to the good I-mode shots of 26 and before but increase the max P(ICRF), steady the nl04 throughout the I-mode and increase the ICRF step sizes sacrificing the P(ICRF) Result: Density ramped up during the RF phase making the RF trip...why? next: repeat
Mar 9 2011 04:25:39:463PM	1110309030	Arturo Dominguez	Repeat shot 29 hoping the density is better controlled. The PO says it's not his fault...the SL is not so sure Result: Density is still rising during the RF phase next: Increase Ip to 1.1MA
Mar 9 2011 04:33:05:100PM	1110309031	Arturo Dominguez	Ip=1.1MA shot Result: Disruption at ~0.6s. Jury says it's a LM next: Increase target nl_04 to 0.8
Mar 9 2011 04:50:40:427PM	1110309032	Arturo Dominguez	Ip=1.1MA nl04=0.8 Same ICRF steps are being used as for shot 29. Result: Good plasma...I-mode (not great RF) next: Repeat
Mar 9 2011 05:01:51:293PM	1110309033	Arturo Dominguez	Ip=1.1MA nl04=0.8 Repeat of shot 32 Result: Good plasma...looks like a brief I-mode at the high ICRF step next: Repeat with Ninja change to D2
Mar 9 2011 05:10:21:473PM	1110309034	Arturo Dominguez	Ip=1.1MA nl04=0.8 Repeat of shot 33 with D2 Result: Good shot, I-mode until it disrupts at ~1.42s End of Run. Thanks everyone!

Physics Operator Comments
Mar 9 2011 09:02:30:770AM	1110309001	Greg Wallace	Load seg 1 from seg 1 of 1110218015 (2011 rev B non-cryo startup) Load seg 2 from seg 2 of 1110215023 (2011 rev B 1.2MA 5.4T LSN) Load seg 3 from seg 2 of 1110216003 (0.8MA rev B locked mode) SEGMENT OFF Changes: Move Ip flattop to 0.5 s. Move nl_04 flattop to 0.5 s. Keep nl_04 setpoint at 0.9e20 after 1.0 s (was negative for t>1.0). Result: No power gas-puff test. Looks like PG3 might not be firing properly??? Hard to tell with DNB firing. Next shot: Repeat no power gas-puff test.
Mar 9 2011 09:10:15:540AM	1110309002	Greg Wallace	Changes: Repeat no power gas-puff test. Result: PG4 looks OK, no puff from PG3. Next shot: Repeat no power gas-puff test. Increase PG3 puff length. New start and end times of -.02 and +.05 s, at 100 for entire pulse.
Mar 9 2011 09:15:36:267AM	1110309003	Greg Wallace	Changes: Repeat no power gas-puff test. Increase PG3 puff length. New start and end times of -.02 and +.05 s, at 100 for entire pulse. Result: Got PG3 puff this time. Next shot: Will reduce PG3 back to "normal" level. Next shot will try for plasma.
Mar 9 2011 09:20:15:693AM	1110309004	Greg Wallace	Changes: Will reduce PG3 back to "normal" level (-.02 to +.04 s, 90 falling to 50). Next shot will try for plasma. Result: Dud. EF1L did not go. Next shot: Try again with EF1L.
Mar 9 2011 09:50:09:750AM	1110309005	Greg Wallace	Changes: Try again with EF1L. Result: Plasma. 5.4 T, 1.2 MA. PO error on TF program, next shot will go to 5.8 T (160 kA) as requested by SL. Disruption at 1.4 s. Next shot: Increase TF current to 160 kA for 5.8 T. Decrease nl_04 program to 8e19 during flattop.
Mar 9 2011 10:06:27:760AM	1110309006	Greg Wallace	Changes: Increase TF current to 160 kA for 5.8 T. Decrease nl_04 program to 8e19 during flattop. Result: Disruption at 0.31 s. Looks like something fell in? Did not get 5.8 T. Next shot: Try again. Enable PG1 for Ne puff.
Mar 9 2011 10:27:09:103AM	1110309007	Greg Wallace	Changes: Try again. Enable PG1 for Ne puff. Result: Plasma. Disruption at 1.25 s. Hot spot in lower inner divertor on WIDE2. Increase nl_04 to 0.9e20 to avoid k limiter heating. Next shot: Increase Ip ramp rate slightly to get flattop by 0.5 s.
Mar 9 2011 10:42:14:657AM	1110309008	Greg Wallace	Changes: Increase Ip ramp rate slightly to get flattop by 0.5 s. Increase nl_04 to 0.9e20 to avoid k limiter heating. Result: Disruption at 0.6 s. Mo injection from limiter? ICRF only at 3 MW when disruption happens. No hot spot visible on WIDE2. Next shot: Increase PG5 Ar puff from 30 to 35 ms for HIREX-SR. Decrease ICRF ramp rate.
Mar 9 2011 11:06:14:613AM	1110309009	Greg Wallace	Changes: Increase PG5 Ar puff from 30 to 35 ms for HIREX-SR. Decrease ICRF ramp rate. Result: Full length plasma. K limiter still red hot. Long cell access for Jerry to investigate edge TS problem. Yuri complains about lack of Ar, although he says 35 ms should be enough. Verified that PG5 is enabled. Next shot: Increase PG5 Ar puff to 50 ms. Also increase Ar plenum pressure from .75 to 1.25 psi.
Mar 9 2011 11:30:43:627AM	1110309010	Greg Wallace	Changes: Increase PG5 Ar puff to 50 ms. Also increase Ar plenum pressure from .75 to 1.25 psi. Result: Disruption at 0.6 s. Injection just before 0.6 s. More Mo. Another long cell access for Jerry to investigate edge TS. Still no dice on that. Next shot: Go to lower current (1.0 MA).
Mar 9 2011 11:45:07:357AM	1110309011	Greg Wallace	Changes: Go to lower current (1.0 MA). Result: Disruption at 0.25 s. Never diverted. ICRF did not cause this disruption. Next shot: Try again.
Mar 9 2011 12:01:44:800PM	1110309012	Greg Wallace	Changes: None. Result: Full length plasma. Injection at 1.06 s. Mo again. Matt says most likely from E-port area. Next shot: Repeat with more ICRF.
Mar 9 2011 12:18:20:257PM	1110309013	Greg Wallace	Changes: Repeat with more ICRF. Result: Disruption in rampdown at 600 kA. Density increases during ICRF from 0.9 to 1.2e20. Next shot: Reduce nl_04 setpoint to 0.8e20.
Mar 9 2011 12:29:55:710PM	1110309014	Greg Wallace	Changes: Reduce nl_04 setpoint to 0.8e20. Result: Plasma, disrupts in rampdown at 600 kA. Density is still overshooting. No puffing during the ICRF so not much I can do about it. Next shot: Reduce Ne chopper voltage from 100 to 70. Keep Ne pulse length the same.
Mar 9 2011 12:41:38:640PM	1110309015	Greg Wallace	Changes: Reduce Ne chopper voltage from 100 to 70. Keep Ne pulse length the same. Result: Disruption at 1.35 s. A few injections prior to the disruption. ICRF is happy, plasma is not. Next shot: Increase Ne chopper back to 100. Increase Ip flattop to 1.1 MA.
Mar 9 2011 12:57:48:643PM	1110309016	Greg Wallace	Changes: Increase Ne chopper back to 100. Increase Ip flattop to 1.1 MA. Result: Disruption at 0.51 s. Mo injection again. Next shot: Reduce Ip to 1.05 MA. Reduce Ne chopper to 70.
Mar 9 2011 01:16:04:603PM	1110309017	Greg Wallace	Changes: Reduce Ip to 1.05 MA. Reduce Ne chopper to 70. Result: Disruption at 0.57 s this time. Next shot: Go back to 1.2 MA to see if we can repeat shot 9.
Mar 9 2011 01:28:58:847PM	1110309018	Greg Wallace	Changes: Go back to 1.2 MA to see if we can repeat shot 9. Result: Disruption at 0.69 s. Next shot: Reduce Ip from 1.2 MA to 1.0 MA. Reduce nl_04 from 8e19 to 7e19.
Mar 9 2011 01:37:58:337PM	1110309019	Greg Wallace	Changes: Reduce Ip from 1.2 MA to 1.0 MA. Reduce nl_04 from 8e19 to 7e19. Result: Disruption at 0.22 s. Next shot: Load seg 2 of 1110215017 into seg 2 (active segment). Will be 1.0 MA with slightly different upper triangularity. Dennis thinks this might help with I-mode formation.
Mar 9 2011 01:52:52:373PM	1110309020	Greg Wallace	Changes: Load seg 2 of 1110215017 into seg 2 (active segment). Will be 1.0 MA with slightly different upper triangularity. Dennis thinks this might help with I-mode formation. Result: Disruption at 0.56 s. Next shot: Extend seg 1 PG3 puff end from 40 ms to 70 ms. Reduce RXL by 2mm across shot.
Mar 9 2011 02:09:30:420PM	1110309021	Greg Wallace	Changes: Extend seg 1 PG3 puff end from 40 ms to 70 ms. Reduce RXL by 2mm across shot. Result: Disruption at 0.25 s. Next shot: Increase seg 1 PG3 puff out to 80 ms. Also increase PG3 height from 50 to 70.
Mar 9 2011 02:27:46:937PM	1110309022	Greg Wallace	Changes: Increase seg 1 PG3 puff out to 80 ms. Also increase PG3 height from 50 to 70. Result: Plasma disrupts at 1.24 s. Mo injections at 0.6 and 1.2 s. Next shot: Reduce magnitude of RXL sweep by 2mm. Increase Ar puff to 50 ms. ICRF will be with Arturo's stepped scheme.
Mar 9 2011 02:38:49:033PM	1110309023	Greg Wallace	Changes: No DPCS changes. ICRF will be with Arturo's stepped scheme. Result: Disruption at 0.59 s. Changes in RXL program were all after 0.6 s. Next shot: Repeat and hope for better results.
Mar 9 2011 02:55:58:677PM	1110309024	Greg Wallace	Changes: Repeat and hope for better results. Result: Plasma all the way through rampdown! And an I-mode! Cell access for GPI filter change from He to D. Next shot: Repeat with D NINJA puff.
Mar 9 2011 03:07:20:350PM	1110309025	Greg Wallace	Changes: Repeat with D NINJA puff. Result: Plasma. Next shot: Repeat for GPI measurement.
Mar 9 2011 03:22:03:007PM	1110309026	Greg Wallace	Changes: Repeat for GPI measurement. Result: Plasma, all the way through rampdown. Got GPI data. Next shot: Switching to locked mode from 1110216003. Seg 2 off, seg 3 on. Change PG5 Ar puff to 150 ms in seg 3.
Mar 9 2011 03:34:48:203PM	1110309027	Greg Wallace	Changes: Switching to locked mode from 1110216003. Seg 2 off, seg 3 on. Change PG5 Ar puff to 150 ms in seg 3. Result: Locked mode. Disruption at 0.54 s. Next shot: Reduce Ar puff (PG5) to 120 ms. Turn off Ne puff (PG1). Try again.
Mar 9 2011 03:49:11:670PM	1110309028	Greg Wallace	Changes: Reduce Ar puff to 120 ms. Try again. Result: Plasma into rampdown. Got locked mode. Next shot: Segment 3 off, segment 2 on. Reload shot 26 from today. Keep nl_04 steady at 7e19 after 1.0 s.
Mar 9 2011 04:06:57:530PM	1110309029	Greg Wallace	Changes: Segment 3 off, segment 2 on. Reload shot 26 from today. Keep nl_04 steady at 7e19 after 1.0 s. Result: Plasma. D-port tripped out. Density is higher than on shot 26, well above demand during ICRF pulse. Next shot: Repeat, cross fingers density does not rise as much during ICRF...
Mar 9 2011 04:23:04:873PM	1110309030	Greg Wallace	Changes: Repeat, cross fingers density does not rise as much during ICRF... Result: Plasma. Density is still not well controlled but there is no gas puffing. Maybe NINJA puff is partly responsible? My suspicion is that the ICRF may be the culprit. Next shot: Increase to 1.1 MA.
Mar 9 2011 04:32:44:167PM	1110309031	Greg Wallace	Changes: Increase to 1.1 MA. Result: Disruption at 0.59 s. Locked mode disruption? Next shot: Increase nl_04 from 7 to 8e19.
Mar 9 2011 04:45:02:330PM	1110309032	Greg Wallace	Changes: Increase nl_04 from 7 to 8e19. Result: Plasma into rampdown. ICRF tripped a few times. Next shot: Repeat.
Mar 9 2011 05:02:04:493PM	1110309033	Greg Wallace	Changes: Repeat. Result: Plasma. Disruption in rampdown at 400 kA. Next shot: Repeat with D NINJA puffing for GPI.
Mar 9 2011 05:11:34:240PM	1110309034	Greg Wallace	Changes: Repeat with D NINJA puffing for GPI. Result: Plasma. Last shot of the day.

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	08:56:43:593AM	Test	Bad	Gas Test
2	09:02:54:223AM	Test	Bad	Gas Test
3	09:09:37:750AM	Test	Ok	Gas Test
4	09:16:24:050AM	Plasma	Bad	EF1L did not fire
5	09:33:34:477AM	Plasma	Ok	Plasma
6	09:54:19:597AM	Plasma	Ok
7	10:06:48:470AM	Plasma	Ok
8	10:27:03:200AM	Plasma	Ok
9	10:43:10:010AM	Plasma	Ok
10	11:07:24:620AM	Plasma	Ok
11	11:32:25:630AM	Plasma	Ok
12	11:45:36:140AM	Plasma	Ok
13	12:06:30:420PM	Plasma	Ok
14	12:19:02:933PM	Plasma	Ok
15	12:32:34:413PM	Plasma	Ok
16	12:47:30:203PM	Plasma	Ok
17	01:00:19:597PM	Plasma	Ok
18	01:16:59:030PM	Plasma	Ok
19	01:29:37:173PM	Plasma	Ok
20	01:42:10:950PM	Plasma	Ok
21	01:54:43:860PM	Plasma	Ok
22	02:12:59:793PM	Plasma	Ok
23	02:28:11:690PM	Plasma	Ok
24	02:40:43:287PM	Plasma	Ok
25	02:59:37:360PM	Plasma	Ok
26	03:12:06:487PM	Plasma	Ok
27	03:27:59:417PM	Plasma	Ok
28	03:40:32:520PM	Plasma	Ok
29	03:58:25:657PM	Plasma	Ok
30	04:12:04:310PM	Plasma	Ok
31	04:25:45:380PM	Plasma	Ok
32	04:38:34:397PM	Plasma	Ok
33	04:52:12:497PM	Plasma	Ok
34	05:06:30:173PM	Plasma	Ok