Alcator C-Mod Run 1100909 Information

Miniproposals

Miniproposal: 617

Date Filed: 8/13/2010

Title: Locked mode rotation studies and development of a novel spectral calibration technique for HiReX-Sr

First Author: Luis Felipe Delgado-Aparicio

Session Leader: Luis Felipe Delgado-Aparicio (shots 1-30)

Operators
Session leader(s):	Luis Felipe Delgado-Aparicio
Physics operator(s):	Bill Rowan
Engineering operator(s):	Andy Pfeiffer,Bill Byford,Gary Dekow

Engineering Operator Run Comment
MP617- Locked Mode rotation studies PO/APO: W. Rowan/Y. Lin, SL: L. Delg

Session Leader Plans

Entered: Sep 8 2010 04:40:25:707PM

Author: Luis Felipe Delgado-Aparicio

The main purpose of this experiment is to study the time-history of the toroidal velocity and ion temperature profiles during locked-modes as well as to attempt ā??unlockingā?? the mode using ICRF heating.

The run plan is as follows:
Part 0: Dial locked-mode shot (1100716004 and/or 1100721006): 3 shots
ā?¢ Use DNB on the third shot using 75 ms ON and 25 ms OFF (from 0.4 to 1.4 s)
Part 1: Early ICRF pulses:
ā?¢ Repeat background shot (e.g. 1100716004): 1 shot
ā?¢ Impart heating: 3 shot x 3 conditions (1, 2, 3 MW): 9 shots.
Part 2: Late ICRF pulses:
ā?¢ Impart heating: 3 shots x 3 conditions (1, 2, 3 MW): 9 shots.
Part 3: Late ICRF pulses: FINE TUNNING for finding ICRF unlocking threshold
ā?¢ 1.0 MW steps every 200 ms: TOTAL: 3 MW in 400 ms: 2 shots
ā?¢ 0.5 MW steps every 100 ms: TOTAL: 3 MW: 2 shots
ā?¢ 0.25 MW steps every 50 ms: TOTAL: 3 MW: 2 shots

Physics Operators Plans

Entered: Sep 8 2010 11:41:55:700AM

Author: Yijun Lin

Thursday, September 09, 2010

MP617- Locked Mode rotation studies and development of a novel spectral calibration technique for HiReX-Sr

PO/APO: W. Rowan/Y. Lin, SL: L. Delgado-Aparicio

------------------
Engineering Setup
-----------------

Run begins at 09:00 and ends at 17:00

Cryopump requested starting with first shot

Power systems as on: 1100716004 (5.4 T, 800 kA, nl target 0.5e20 m^-2)

Acoil: +Dtop -Dbot -Jtop +Jbot (standard) Hybrid Enabled

Gas setup:

Fill B-Top with 6 psi D2 Hybrid enabled (PG4)
fill B-side lower with 1 psi Ar Hybrid enabled (PG1)
leave B-side upper as is Hybrid DISABLED (PG2)
fill B-main (C-side) with 40 psi D2 Hybrid enabled (PG3)
leave NINJA as DISABLED

Enable gate-valves and shutters: ECE, VUV, HiREX Sr, Xeus, DNB
Leave z-bolo shutter as is (should be open)

Torvac gatevalve toggle (yes/no): no

Boronization: no
Overnight ECDC: yes
ICRF: YES (all transmitters, heating phase, up to 3 MW)
LH: no
Cryopump: YES
DNB: YES

Vessel temperature: 35/35/35

overnight ECDC
Gas Setup
Gas: D2
sweep: 44/45/103 cm
scan: 20/120 s
Pressure: 2.0e-4 Torr

-------------------------
PO-plan:
-------------------------

Reload shot 1100716004 (5.4 T, 0.8 MA, nl target = 0.5e20 m^-2).

After successfully obtaining locked mode plasma, vary ICRF waveforms (see SL_plan)

Session Leader Summaries

Entered: Sep 10 2010 11:02:56:680AM

Author: Luis Felipe Delgado-Aparicio

Luis Delgado Aparicio run MP617 on ā??Locked mode rotation studies and development of a novel spectral calibration technique for HiReX-Srā??. The main purpose of this experiment was to study the time-history of the toroidal velocity and ion temperature profiles during locked-modes as well as to attempt ā??unlockingā?? the mode using ICRF heating. The reproducibility of the locked-mode conditions was remarkable and allowed us to have thirty shots with a variety of early and late ICRF pulses of 1, 2 and 3 MW. Diagnostic-neutral-beam (DNB) blips were also used to ascertain the edge and core toroidal velocity from boron charge-exchange spectroscopy and compare it with the results from Doppler shift measurements using the HiReX-Sr spectrometer. The number of shots using 3 MW of ICRF power were reduced due to evidence of limiter heating and recommendations from the physics operator and RF leader. An interesting aspect of the experiment was the successful un-locking of the mode during long (500 ms) and short (50-100 ms) pulses without transition to H-mode; the latter were also part of a scoping study for further heat and momentum transport experiments.

Physics Operator Summaries

Entered: Sep 10 2010 08:18:02:830AM

Author: Yijun Lin

A successful run. Most parts in the SL-plan were accomplished. Got locked mode as required on most shots and (often) disruption during rampdown. The locked mode was shown to be unlocked by ICRF heating (see SL summary).

shot 4 was aborted by dpcs_xjump. After raising PG3 puff, the problem did not occur in the following shots.

Note: all these shots were run with segment 1 and segment 3. Segment 1 was loaded from 1100901004 and segment 3 was loaded from 1100716004. There was also a ACOIL 4 kA programmed. This program generated PLC warning saying the coil current is above the current limit (3 kA).

Score card:
30 plasma attempts
27 good plasmas (most have locked mode as requested)
1 soft-abort by dpcs_xjump
1 fizzle
1 disruption before rampdown

Session Leader Comments

Sep 9 2010 09:06:38:637AM 1100909001 Luis Felipe Delgado-Aparicio Plasma density was too high: neL(t=0.7)~6.74e19 while the density for the shot of interest should be of the order of 5.2-5.5e19. Try it again.

Sep 9 2010 09:26:28:800AM 1100909002 Luis Felipe Delgado-Aparicio That was much better. We observed indications of mode-locking. Sawtoothing dissapeared at ~ 682 ms, though I did not see the temperature flattening from FRC. Shot #003 will also be a repeat.

Sep 9 2010 09:43:39:720AM 1100909003 Luis Felipe Delgado-Aparicio Sawtoothing dissapeared at ~ 735 ms, possibly due to a change in density. Reflectometer data indicates a density pump-out at ~756 ms.

DND is not ready yet so we are repeating the shot. They are requesting 100 ms ON and 100 ms OFF from 0.4 to 1.5 s; instead of the short 25 ms OFF.

Sep 9 2010 09:56:46:343AM 1100909004 Luis Felipe Delgado-Aparicio Disrupt! Try it again. DND is reeady for the next shot.

Sep 9 2010 10:15:00:997AM 1100909005 Luis Felipe Delgado-Aparicio Nice shot. The small change in density also translated in changing the locked-mode timing. This time the sawtooth dissapear is approx 823 ms.

The change of toroidal velocity from HITEX-Sr is of the order of 20-30 km/s. Compare with shot #4. Check the cell temperature and TURN on the thermocouple inside the spectrometer.

END OF PART 0.

Sep 9 2010 10:34:15:953AM 1100909006 Luis Felipe Delgado-Aparicio BEGIN PART 1.

Begin ICRF at 420 ms with the correction coil current. It locked later at around 1.05 secs!

Take a look at the velocity profiles at ~0.8 sec (?). 13 km/sec change in 50 ms => transport?

Sep 9 2010 10:43:47:260AM 1100909007 Luis Felipe Delgado-Aparicio Begin ICRF at 660 ms after the correction coil current has reached flattop. Also lockes at a later time!

Sep 9 2010 11:06:56:270AM 1100909008 Luis Felipe Delgado-Aparicio This was a repeat of shot 007. We decided to remove the ICRF modulation at the end because we need to see the locking data using HIREX-Sr.

NOTE: We may want to revisit this 1MW shot WITHOUT the RF modulation at the end!

Using 1MW of ICRF the stored energy grows from 37.6 kJ at 0.65 s to 58.4 kJ at 0.817 sec.

END of part 1a)!

Sep 9 2010 11:43:42:183AM 1100909009 Luis Felipe Delgado-Aparicio Steve and friends fixed the RF power supply "problem".

BEGIN of part 1b)

PLAN: 2 MW RF power begins at 440 ms. NO RF modulation at the end.

RESULT: We only got 1 MW! Lets consider it as the final shot for part 1a), that actually we wanted to repeat without the RF modulation. Good. Certainly RF has done its job on delaying the locked-mode.

Sep 9 2010 12:01:40:093PM 1100909010 Luis Felipe Delgado-Aparicio PLAN: 2 MW RF power begins at 440 ms.

RESULT: Good shot. Got into H-mode and back to Ohmic 4 times.

After the RF power is turned OFF the plasma recovers its original -10 km/sec and then the error field locks it again! Take a look at ~1.45 sec.

Sep 9 2010 12:09:47:557PM 1100909011 Luis Felipe Delgado-Aparicio RF tripped. The locked mode still appear.
Lets repeat this shot.

Don't forget to take a look at the Lyman-a 1 & 2 and compare their ratios at 1, 2 and 3 MW.

Sep 9 2010 12:23:39:280PM 1100909012 Luis Felipe Delgado-Aparicio PLAN: 2 MW RF power begins at 660 ms.

RESULT: Good shot. Locked again at 1.2 sec instead that at 1.4 sec in shot #010.

Sep 9 2010 12:38:07:180PM 1100909013 Luis Felipe Delgado-Aparicio PLAN: 3 MW RF power begins at 420 ms.

RESULT: "Choppy" 3 MW. Lets repeat.

Sep 9 2010 01:03:26:290PM 1100909014 Luis Felipe Delgado-Aparicio PLAN: 3 MW RF power begins at 420 ms.

RESULT: Another "2MW" pulse. The velocity at the locking time seem a bit too high (~10 km/sec ???). The spectrometer temperature has not change THAT much! A 0.5 degree change from 10 am in the morning will result in approximately + 2-3 km/s but not 10! Plasma locks again at ~1.13 sec.

Lets look for the 3 MW pulse again.

Sep 9 2010 01:34:32:580PM 1100909016 Luis Felipe Delgado-Aparicio PLAN: 3 MW RF power begins at 660 ms.

RESULT: "Good", some trips, but good.Locked now at ~1.33 sec.

Note: We got 10 times more signal during ICRF than without

We just finished part 1c).

Sep 9 2010 01:49:50:623PM 1100909017 Luis Felipe Delgado-Aparicio BEGIN part 2

PLAN: Get the original locked-mode

RESULT: Good shot. Locked at ~815 ms. The velocity well within the locked-mode appears now to be consistent to what we have observed in the last few shots and of the order of 10 km/s instead of ZERO!!!! We have drifted to longer wavelengths indicating a cooling of the crystal temperature. Check the temperatures on the crystal and the cell!

Sep 9 2010 02:15:17:450PM 1100909018 Luis Felipe Delgado-Aparicio PLAN: Get the original locked-mode + 1 MW ICRF from 1sec to 1.5 sec. We want to get it out of the locked-mode. Lets make it rotate!

RESULT: Good shot. Get locked again like around 0.832 sec. It appears locked for the whole entire time. Next shot will be a repeat.

The core temperature at the locking time is 1.81 keV while dueing the ICRF pulse
rises to 2.37 keV at 1.5 sec.

Sep 9 2010 02:29:56:983PM 1100909019 Luis Felipe Delgado-Aparicio PLAN: Get the original locked-mode + 1 MW ICRF from 1sec to 1.5 sec. We want to get it out of the locked-mode. Lets make it rotate!

RESULT: The plasma did not lock mainly because of a density effect from 4.7e19 on the previous shot to 5.4e19 in this shot. The density control did not work as expected from 0.7 onwards.

We got H-mode transitions as well.Lets try a repeat.

Sep 9 2010 02:35:27:410PM 1100909020 Luis Felipe Delgado-Aparicio PLAN: Repeat from the previous shot. Get the original locked-mode + 1 MW ICRF from 1sec to 1.5 sec.

RESULT: Good it locked at the same times as shot #18.

Sep 9 2010 02:53:41:930PM 1100909021 Luis Felipe Delgado-Aparicio PLAN: 2 MW ICRF from 1sec to 1.5 sec.

RESULT: It appears that we have unlocked the mode. We recover the sawtheeth and the plasma appers to be rotating at approximately -10 km/sec. Lets repeat this shot.

Sep 9 2010 03:05:41:407PM 1100909022 Luis Felipe Delgado-Aparicio PLAN: 2 MW ICRF from 1sec to 1.5 sec.

RESULT: The same as before! Locks and "unlocks" with -10 km/sec. After RF turns off the velocity goes to zero. Does it locks again? From 1.5 sec onwards we have the current ramp down and the locked-mode threshold depends also on Ip! Be careful.

Sep 9 2010 03:28:39:183PM 1100909023 Luis Felipe Delgado-Aparicio PLAN: 3 MW ICRF from 1sec to 1.5 sec.

RESULT: I think we did not lock! Lets repeat!

Sep 9 2010 03:38:40:450PM 1100909024 Luis Felipe Delgado-Aparicio PLAN: 3 MW ICRF from 1sec to 1.5 sec.

RESULT: We locked at around t=763 ms. The unlocking took place and we got a toroidal velocity of -10 km/sec, the same as the 2 MW case. Not power sensitive?

BY THE WAY, we DID not get into H-mode.

Sep 9 2010 03:58:29:350PM 1100909025 Luis Felipe Delgado-Aparicio PLAN: 3 MW ICRF from 1sec to 1.5 sec.

RESULT: Disrupted! No more 3 MW RF plasmas cause we do not want to burn the limiter.

Next shot we will try some RF modulations. First, 50 ms ON/OFF, then later some 100 ms ON/OFF

Sep 9 2010 04:27:19:003PM 1100909027 Luis Felipe Delgado-Aparicio PLAN: 2 MW ICRF power modulation: 50 ms ON/OFF

RESULT: Nice modulations. the fourth did not work. REPEAT.

Sep 9 2010 04:33:26:020PM 1100909028 Luis Felipe Delgado-Aparicio PLAN: 2 MW ICRF power modulation: 50 ms ON/OFF

RESULT: Worked!

Sep 9 2010 04:54:49:773PM 1100909029 Luis Felipe Delgado-Aparicio PLAN: 2 MW ICRF power modulation: 100 ms ON/OFF

RESULT: Very good. It locks like around 750 ms.

Moreover, we begin to observe a relationship between the ICRF pulses and the locking and unlocking of the plasma. Great shot. Lets repeat!

Sep 9 2010 05:03:32:357PM 1100909030 Luis Felipe Delgado-Aparicio PLAN: 2 MW ICRF power modulation: 100 ms ON/OFF

RESULT: Very good. It locks like around 700 ms.

Physics Operator Comments

Sep 9 2010 09:13:39:687AM 1100909001 Yijun Lin Loaded from 1100716004,
imported segment 1 from 1100901004 (2010 cryopump start)
Segment 1 on
PG4 prefill 40 ms (for cryopump start)
PG3 at 50 until 100 ms.
Segment 3 on
(there is ACOIL current programed from 0.4 to 1.6 sec for locked mode)

1st shot:
cryopump, ohmic, attempt for locked mode
(0.8 MA, 5.4 T, target nl 0.5e20 m^-2)

loaded 9-Sep-2010 08:01:32.00

Result: ran. full length.
Density higher than programed (0.7e20 at 0.7 sec) (Typically, it is not so easy to get low density in the first plasma).
(No PG3 puff after 0.1 sec. Apparently, the programed PG3 between 0.-0.1 sec is more than required to get the programed density)

No locked mode (ACOIL ran as programed).

Startup ok.
warning on ACOIL
Coil --PLC-- --Range-- -- % --

CCOIL 3.0 3.0 3.724 -0.234 124.1 7.8
(the coil was programed at 4 kA. This was discussed with Steve Wolfe yesterday and he said it was OK).

Next: no pcs change.

Sep 9 2010 09:23:43:397AM 1100909002 Yijun Lin Program: 0.8 MA, 5.4 T, targe nl04 = 0.5e20 m^02, ACOIL 0.4-1.6 sec for Locked-mode.

Result:
Density as programed.
Got locked mode as requested. (SL is happy).
Disruption at 1.67 s.

Next: no dpcs change.

Sep 9 2010 09:35:34:940AM 1100909003 Yijun Lin Program: 0.8 MA, 5.4 T, targe nl04 = 0.5e20 m^02, ACOIL 0.4-1.6 sec for Locked-mode.

Result: Disruption at 1.71 s.

Got locked mode at 0.74 s

Bounced in startup.

Next: same plasma, add DNB.

add 1 ms in PG4 pre-puff (hope to eliminate the bouncer).

Sep 9 2010 09:57:34:020AM 1100909004 Yijun Lin DPCS_XJUMP caused soft abort at 0.1212 sec.

Plasma aborted.

next:
Add more PG3 gas puff. (0.01s/50 to 0.01s/60 and 0.1s/50 to 0.1s/60), to increase density in the startup, to reduce hards.

Sep 9 2010 10:07:21:567AM 1100909005 Yijun Lin Program: 0.8 MA, 5.4 T, targe nl04 = 0.5e20 m^02, ACOIL 0.4-1.6 sec for Locked-mode.

Result: Disruption at 1.70 s.

Got locked mode

So adding PG3 puff got rid of the hards (and dpcs_xjump soft abort)

Next: Add 1 MW rf power.

no change in dpcs.

Sep 9 2010 10:24:50:660AM 1100909006 Yijun Lin Program: 0.8 MA, 5.4 T, targe nl04 = 0.5e20 m^02, ACOIL 0.4-1.6 sec for Locked-mode.

Result: plasma full-length.

startup ok

Next: no dpcs change.

Sep 9 2010 10:41:55:737AM 1100909007 Yijun Lin Program: 0.8 MA, 5.4 T, targe nl04 = 0.5e20 m^02, ACOIL 0.4-1.6 sec for Locked-mode.

Result: plasma full-length.

startup ok

Next: no dpcs change.

Sep 9 2010 11:02:39:170AM 1100909008 Yijun Lin Program: 0.8 MA, 5.4 T, targe nl04 = 0.5e20 m^02, ACOIL 0.4-1.6 sec for Locked-mode.

Result: plasma full-length.

startup ok

Cell access after the shot

Next: no dpcs change.

Sep 9 2010 11:53:07:043AM 1100909010 Yijun Lin Program: 0.8 MA, 5.4 T, targe nl04 = 0.5e20 m^02, ACOIL 0.4-1.6 sec for Locked-mode.

Result: plasma. disruption 1.67s. H-modes with ICRF.

Startup ok.

Next: no dpcs change. (change ICRF timing)

Sep 9 2010 12:06:16:857PM 1100909011 Yijun Lin Program: 0.8 MA, 5.4 T, targe nl04 = 0.5e20 m^02, ACOIL 0.4-1.6 sec for Locked-mode.

Result: plasma. disruption 1.67s. H-modes with ICRF.

Startup ok.

Next: no dpcs change.

Sep 9 2010 12:24:19:503PM 1100909012 Yijun Lin Program: 0.8 MA, 5.4 T, targe nl04 = 0.5e20 m^02, ACOIL 0.4-1.6 sec for Locked-mode.

Result: plasma. disruption 1.67s. H-modes with ICRF. Locked mode.

Startup ok. Injection at 34 ms, but survived.
a marfe was going to form (Dalpha peak) at 0.12 sec, but did not last.

Next: no dpcs change. (Higher RF power)

Sep 9 2010 12:38:01:473PM 1100909013 Yijun Lin Program: 0.8 MA, 5.4 T, targe nl04 = 0.5e20 m^02, ACOIL 0.4-1.6 sec for Locked-mode.

Result: plasma. disruption 1.67s. H-modes with ICRF. Locked mode.
A marfe forming at 0.12 sec, but decide not to do anything about it.
Next: no dpcs change.

Sep 9 2010 12:52:01:497PM 1100909014 Yijun Lin Program: 0.8 MA, 5.4 T, targe nl04 = 0.5e20 m^02, ACOIL 0.4-1.6 sec for Locked-mode.

Result: plasma. disruption 1.69s. H-modes with ICRF. Locked mode.

Next: no dpcs change.

Sep 9 2010 01:18:32:823PM 1100909015 Yijun Lin Program: 0.8 MA, 5.4 T, targe nl04 = 0.5e20 m^02, ACOIL 0.4-1.6 sec for Locked-mode.

Result: plasma. disruption 1.66s. H-modes with ICRF. Locked mode.

Startup ok.

Next: no dpcs change.

Sep 9 2010 01:29:59:287PM 1100909016 Yijun Lin Program: 0.8 MA, 5.4 T, targe nl04 = 0.5e20 m^02, ACOIL 0.4-1.6 sec for Locked-mode.
Result: plasma. disruption 1.66s. H-modes with ICRF. Locked mode.
Startup ok
Next: no dpcs change. (no RF) (SL plan part 2)

Sep 9 2010 01:44:37:883PM 1100909017 Yijun Lin Program: 0.8 MA, 5.4 T, targe nl04 = 0.5e20 m^02, ACOIL 0.4-1.6 sec for Locked-mode.
Result: plasma. full-length. Locked mode.
Startup ok

Next: no dpcs change. (with RF)

Sep 9 2010 02:01:17:797PM 1100909018 Yijun Lin Program: 0.8 MA, 5.4 T, targe nl04 = 0.5e20 m^02, ACOIL 0.4-1.6 sec for Locked-mode.
Result: plasma. full-length. Locked mode.
Startup ok

Next: no dpcs change.

Sep 9 2010 02:28:34:603PM 1100909019 Yijun Lin Program: 0.8 MA, 5.4 T, targe nl04 = 0.5e20 m^02, ACOIL 0.4-1.6 sec for Locked-mode.
Result: plasma. full-length.
No locked mode. density was somewhat higher than last shot. (don't know why. Everything worked as programed.)
Startup ok

Next: Lower the nl04 point slightly at 0.38 sec (from 0.5e20 to 4.2e20). no other change.

Sep 9 2010 02:38:32:893PM 1100909020 Yijun Lin Program: 0.8 MA, 5.4 T, targe nl04 = 0.5e20 m^02, ACOIL 0.4-1.6 sec for Locked-mode.
Result: plasma. disruption 1.7 sec. locked mode.

(maybe the small change of nl04 programing improved the density control)
Startup ok

Next: no dpcs change. (2 MW ICRF)

Sep 9 2010 02:50:34:467PM 1100909021 Yijun Lin Program: 0.8 MA, 5.4 T, targe nl04 = 0.5e20 m^02, ACOIL 0.4-1.6 sec for Locked-mode.
Result: plasma. disruption 1.7 sec. locked mode.

Startup ok

Next: no dpcs change. (2 MW ICRF)

Sep 9 2010 03:04:07:727PM 1100909022 Yijun Lin Program: 0.8 MA, 5.4 T, targe nl04 = 0.5e20 m^02, ACOIL 0.4-1.6 sec for Locked-mode.
Result: plasma. disruption 1.7 sec. locked mode.

Startup ok

Next: no dpcs change. (3 MW ICRF)

Sep 9 2010 03:22:23:650PM 1100909023 Yijun Lin Program: 0.8 MA, 5.4 T, targe nl04 = 0.5e20 m^02, ACOIL 0.4-1.6 sec for Locked-mode.
Result: plasma. disruption 1.76 sec. locked mode.

Startup ok

Next: no dpcs change. (3 MW ICRF)

Sep 9 2010 03:35:26:900PM 1100909024 Yijun Lin Program: 0.8 MA, 5.4 T, targe nl04 = 0.5e20 m^02, ACOIL 0.4-1.6 sec for Locked-mode.
Result: plasma. full length. locked mode.

Startup ok (rather smooth current rise. the small bounce in the previous shots disappeared without doing anything)

Next: no dpcs change. (3 MW ICRF)

Sep 9 2010 03:58:08:647PM 1100909025 Yijun Lin Program: 0.8 MA, 5.4 T, targe nl04 = 0.5e20 m^02, ACOIL 0.4-1.6 sec for Locked-mode.
Result: plasma. locked mode. disrupted at 1 sec just before RF.

Startup ok.

Concerning about melting the limiter at 3 MW Prf.

Next: no dpcs change. (modulate RF)

Sep 9 2010 04:11:31:037PM 1100909026 Yijun Lin fizzle. (post-disruption)
(Ratiomatic gauge was turned off after the disruption). I don't know the pre-fill gas pressure. Presumably, it is too high.

(Bill toggled it on after the shot).

Next: shorten PG4 pre-fill by 2 ms.

Sep 9 2010 04:19:05:480PM 1100909027 Yijun Lin Program: 0.8 MA, 5.4 T, targe nl04 = 0.5e20 m^02, ACOIL 0.4-1.6 sec for Locked-mode.
Result: plasma. locked mode.

Startup good. (maybe due to what I did, or not)

Next: no dpcs change. (modulate RF)

Sep 9 2010 04:50:13:203PM 1100909029 Yijun Lin Program: 0.8 MA, 5.4 T, targe nl04 = 0.5e20 m^02, ACOIL 0.4-1.6 sec for Locked-mode.
Result: plasma. locked mode.

Startup good.

Next: no dpcs change. (modulate RF)

Sep 9 2010 05:00:23:900PM 1100909030 Yijun Lin Program: 0.8 MA, 5.4 T, targe nl04 = 0.5e20 m^02, ACOIL 0.4-1.6 sec for Locked-mode.
Result: plasma. locked mode.

End of run.

Engineering Operator Comments

Shot Time Type Status Comment

1 08:58:00:373AM Plasma Ok

2 09:12:23:733AM Plasma Ok

3 09:25:33:180AM Plasma Ok

4 09:45:45:663AM Plasma Ok

5 09:59:29:043AM Plasma Ok

6 10:16:31:560AM Plasma Ok

7 10:32:29:043AM Plasma Ok

8 10:52:19:140AM Plasma Ok

9 11:30:02:640AM Plasma Ok

10 11:45:00:437AM Plasma Ok

11 12:01:11:787PM Plasma Ok

12 12:14:09:520PM Plasma Ok

13 12:29:35:077PM Plasma Ok

14 12:45:56:183PM Plasma Ok

15 01:08:47:620PM Plasma Ok

16 01:23:41:237PM Plasma Ok

17 01:38:21:853PM Plasma Ok

18 01:54:19:263PM Plasma Ok

19 02:13:19:060PM Plasma Ok

20 02:29:18:367PM Plasma Ok

21 02:43:04:273PM Plasma Ok

22 02:56:51:177PM Plasma Ok

23 03:12:34:840PM Plasma Ok

24 03:27:18:680PM Plasma Ok

25 03:44:59:303PM Plasma Ok

26 03:58:54:407PM Plasma Ok

27 04:11:53:050PM Plasma Ok

28 04:26:43:207PM Plasma Ok

29 04:42:24:517PM Plasma Ok

30 04:56:14:370PM Plasma Ok

System Availability

Sep 9 2010 08:57:40:540AM

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 no BES system is ready for Up-to-air (Apr, 2010) Mar 31 2010 10:36AM (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 no 3/26/10 Bottle Removed From Cell, monitors powered down, Autodialer function bypassed Mar 26 2010 05:29PM (dekow) Jim Irby Boronization dekow,irby
CNPA no Single channel CNPA available as of 12/1707 Jun 10 2009 10:22AM (twf) 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 no Wide-view CXRS system is power down and ready for up-to-air (Apr, 2010) Mar 31 2010 10:36AM (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. Jul 30 2010 08:13AM (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. Ch 5 preamp replaced 6/18. Jun 22 2010 03:03PM (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 are still not available. Jul 22 2010 08:41AM (ypodpaly) John Rice High Resolution X-Ray ince,rice,ypodpaly
HXR yes Jun 28 2010 12:12PM (schmidt) Ron Parker Hard X-Ray Array 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 was tested into dummy loads synced to shot. Shorts have been removed. Probe Cal. 6/29/10 evening. Jun 29 2010 03:51PM (dterry) Ron Parker Lower Hybrid dterry,parker,wallaceg
Lower Hybrid Reflectometer yes 60 GHz system to detect upshifted signal Jul 28 2010 01:39PM (sgbaek) Arturo Dominguez Lower Hybrid Reflectometer dominguez,marmar,parker,sgbaek
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. Start at reduced speed. Jun 22 2010 03:02PM (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. Jul 19 2010 05:54PM (ntsujii) Miklos Porkolab Phase Contrast Imaging arai,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 yes On 1100817xxx the system is fully connected. These are still some noise issues but the system should be in better shape than the previous week. Aug 17 2010 08:53AM (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 no SSS installed and leak tested, individual probes not installed Jun 28 2010 01:28PM (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, but density is **uncalibrated** Jul 14 2010 11:54AM (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 Operational. Raw spectra stored but not line brightness time histories are going into the tree yet. Aug 24 2010 09:17AM (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
Sep 9 2010 09:06:38:637AM	1100909001	Luis Felipe Delgado-Aparicio	Plasma density was too high: neL(t=0.7)~6.74e19 while the density for the shot of interest should be of the order of 5.2-5.5e19. Try it again.
Sep 9 2010 09:26:28:800AM	1100909002	Luis Felipe Delgado-Aparicio	That was much better. We observed indications of mode-locking. Sawtoothing dissapeared at ~ 682 ms, though I did not see the temperature flattening from FRC. Shot #003 will also be a repeat.
Sep 9 2010 09:43:39:720AM	1100909003	Luis Felipe Delgado-Aparicio	Sawtoothing dissapeared at ~ 735 ms, possibly due to a change in density. Reflectometer data indicates a density pump-out at ~756 ms. DND is not ready yet so we are repeating the shot. They are requesting 100 ms ON and 100 ms OFF from 0.4 to 1.5 s; instead of the short 25 ms OFF.
Sep 9 2010 09:56:46:343AM	1100909004	Luis Felipe Delgado-Aparicio	Disrupt! Try it again. DND is reeady for the next shot.
Sep 9 2010 10:15:00:997AM	1100909005	Luis Felipe Delgado-Aparicio	Nice shot. The small change in density also translated in changing the locked-mode timing. This time the sawtooth dissapear is approx 823 ms. The change of toroidal velocity from HITEX-Sr is of the order of 20-30 km/s. Compare with shot #4. Check the cell temperature and TURN on the thermocouple inside the spectrometer. END OF PART 0.
Sep 9 2010 10:34:15:953AM	1100909006	Luis Felipe Delgado-Aparicio	BEGIN PART 1. Begin ICRF at 420 ms with the correction coil current. It locked later at around 1.05 secs! Take a look at the velocity profiles at ~0.8 sec (?). 13 km/sec change in 50 ms => transport?
Sep 9 2010 10:43:47:260AM	1100909007	Luis Felipe Delgado-Aparicio	Begin ICRF at 660 ms after the correction coil current has reached flattop. Also lockes at a later time!
Sep 9 2010 11:06:56:270AM	1100909008	Luis Felipe Delgado-Aparicio	This was a repeat of shot 007. We decided to remove the ICRF modulation at the end because we need to see the locking data using HIREX-Sr. NOTE: We may want to revisit this 1MW shot WITHOUT the RF modulation at the end! Using 1MW of ICRF the stored energy grows from 37.6 kJ at 0.65 s to 58.4 kJ at 0.817 sec. END of part 1a)!
Sep 9 2010 11:43:42:183AM	1100909009	Luis Felipe Delgado-Aparicio	Steve and friends fixed the RF power supply "problem". BEGIN of part 1b) PLAN: 2 MW RF power begins at 440 ms. NO RF modulation at the end. RESULT: We only got 1 MW! Lets consider it as the final shot for part 1a), that actually we wanted to repeat without the RF modulation. Good. Certainly RF has done its job on delaying the locked-mode.
Sep 9 2010 12:01:40:093PM	1100909010	Luis Felipe Delgado-Aparicio	PLAN: 2 MW RF power begins at 440 ms. RESULT: Good shot. Got into H-mode and back to Ohmic 4 times. After the RF power is turned OFF the plasma recovers its original -10 km/sec and then the error field locks it again! Take a look at ~1.45 sec.
Sep 9 2010 12:09:47:557PM	1100909011	Luis Felipe Delgado-Aparicio	RF tripped. The locked mode still appear. Lets repeat this shot. Don't forget to take a look at the Lyman-a 1 & 2 and compare their ratios at 1, 2 and 3 MW.
Sep 9 2010 12:23:39:280PM	1100909012	Luis Felipe Delgado-Aparicio	PLAN: 2 MW RF power begins at 660 ms. RESULT: Good shot. Locked again at 1.2 sec instead that at 1.4 sec in shot #010.
Sep 9 2010 12:38:07:180PM	1100909013	Luis Felipe Delgado-Aparicio	PLAN: 3 MW RF power begins at 420 ms. RESULT: "Choppy" 3 MW. Lets repeat.
Sep 9 2010 01:03:26:290PM	1100909014	Luis Felipe Delgado-Aparicio	PLAN: 3 MW RF power begins at 420 ms. RESULT: Another "2MW" pulse. The velocity at the locking time seem a bit too high (~10 km/sec ???). The spectrometer temperature has not change THAT much! A 0.5 degree change from 10 am in the morning will result in approximately + 2-3 km/s but not 10! Plasma locks again at ~1.13 sec. Lets look for the 3 MW pulse again.
Sep 9 2010 01:34:32:580PM	1100909016	Luis Felipe Delgado-Aparicio	PLAN: 3 MW RF power begins at 660 ms. RESULT: "Good", some trips, but good.Locked now at ~1.33 sec. Note: We got 10 times more signal during ICRF than without We just finished part 1c).
Sep 9 2010 01:49:50:623PM	1100909017	Luis Felipe Delgado-Aparicio	BEGIN part 2 PLAN: Get the original locked-mode RESULT: Good shot. Locked at ~815 ms. The velocity well within the locked-mode appears now to be consistent to what we have observed in the last few shots and of the order of 10 km/s instead of ZERO!!!! We have drifted to longer wavelengths indicating a cooling of the crystal temperature. Check the temperatures on the crystal and the cell!
Sep 9 2010 02:15:17:450PM	1100909018	Luis Felipe Delgado-Aparicio	PLAN: Get the original locked-mode + 1 MW ICRF from 1sec to 1.5 sec. We want to get it out of the locked-mode. Lets make it rotate! RESULT: Good shot. Get locked again like around 0.832 sec. It appears locked for the whole entire time. Next shot will be a repeat. The core temperature at the locking time is 1.81 keV while dueing the ICRF pulse rises to 2.37 keV at 1.5 sec.
Sep 9 2010 02:29:56:983PM	1100909019	Luis Felipe Delgado-Aparicio	PLAN: Get the original locked-mode + 1 MW ICRF from 1sec to 1.5 sec. We want to get it out of the locked-mode. Lets make it rotate! RESULT: The plasma did not lock mainly because of a density effect from 4.7e19 on the previous shot to 5.4e19 in this shot. The density control did not work as expected from 0.7 onwards. We got H-mode transitions as well.Lets try a repeat.
Sep 9 2010 02:35:27:410PM	1100909020	Luis Felipe Delgado-Aparicio	PLAN: Repeat from the previous shot. Get the original locked-mode + 1 MW ICRF from 1sec to 1.5 sec. RESULT: Good it locked at the same times as shot #18.
Sep 9 2010 02:53:41:930PM	1100909021	Luis Felipe Delgado-Aparicio	PLAN: 2 MW ICRF from 1sec to 1.5 sec. RESULT: It appears that we have unlocked the mode. We recover the sawtheeth and the plasma appers to be rotating at approximately -10 km/sec. Lets repeat this shot.
Sep 9 2010 03:05:41:407PM	1100909022	Luis Felipe Delgado-Aparicio	PLAN: 2 MW ICRF from 1sec to 1.5 sec. RESULT: The same as before! Locks and "unlocks" with -10 km/sec. After RF turns off the velocity goes to zero. Does it locks again? From 1.5 sec onwards we have the current ramp down and the locked-mode threshold depends also on Ip! Be careful.
Sep 9 2010 03:28:39:183PM	1100909023	Luis Felipe Delgado-Aparicio	PLAN: 3 MW ICRF from 1sec to 1.5 sec. RESULT: I think we did not lock! Lets repeat!
Sep 9 2010 03:38:40:450PM	1100909024	Luis Felipe Delgado-Aparicio	PLAN: 3 MW ICRF from 1sec to 1.5 sec. RESULT: We locked at around t=763 ms. The unlocking took place and we got a toroidal velocity of -10 km/sec, the same as the 2 MW case. Not power sensitive? BY THE WAY, we DID not get into H-mode.
Sep 9 2010 03:58:29:350PM	1100909025	Luis Felipe Delgado-Aparicio	PLAN: 3 MW ICRF from 1sec to 1.5 sec. RESULT: Disrupted! No more 3 MW RF plasmas cause we do not want to burn the limiter. Next shot we will try some RF modulations. First, 50 ms ON/OFF, then later some 100 ms ON/OFF
Sep 9 2010 04:27:19:003PM	1100909027	Luis Felipe Delgado-Aparicio	PLAN: 2 MW ICRF power modulation: 50 ms ON/OFF RESULT: Nice modulations. the fourth did not work. REPEAT.
Sep 9 2010 04:33:26:020PM	1100909028	Luis Felipe Delgado-Aparicio	PLAN: 2 MW ICRF power modulation: 50 ms ON/OFF RESULT: Worked!
Sep 9 2010 04:54:49:773PM	1100909029	Luis Felipe Delgado-Aparicio	PLAN: 2 MW ICRF power modulation: 100 ms ON/OFF RESULT: Very good. It locks like around 750 ms. Moreover, we begin to observe a relationship between the ICRF pulses and the locking and unlocking of the plasma. Great shot. Lets repeat!
Sep 9 2010 05:03:32:357PM	1100909030	Luis Felipe Delgado-Aparicio	PLAN: 2 MW ICRF power modulation: 100 ms ON/OFF RESULT: Very good. It locks like around 700 ms.

Physics Operator Comments
Sep 9 2010 09:13:39:687AM	1100909001	Yijun Lin	Loaded from 1100716004, imported segment 1 from 1100901004 (2010 cryopump start) Segment 1 on PG4 prefill 40 ms (for cryopump start) PG3 at 50 until 100 ms. Segment 3 on (there is ACOIL current programed from 0.4 to 1.6 sec for locked mode) 1st shot: cryopump, ohmic, attempt for locked mode (0.8 MA, 5.4 T, target nl 0.5e20 m^-2) loaded 9-Sep-2010 08:01:32.00 Result: ran. full length. Density higher than programed (0.7e20 at 0.7 sec) (Typically, it is not so easy to get low density in the first plasma). (No PG3 puff after 0.1 sec. Apparently, the programed PG3 between 0.-0.1 sec is more than required to get the programed density) No locked mode (ACOIL ran as programed). Startup ok. warning on ACOIL Coil --PLC-- --Range-- -- % -- CCOIL 3.0 3.0 3.724 -0.234 124.1 7.8 (the coil was programed at 4 kA. This was discussed with Steve Wolfe yesterday and he said it was OK). Next: no pcs change.
Sep 9 2010 09:23:43:397AM	1100909002	Yijun Lin	Program: 0.8 MA, 5.4 T, targe nl04 = 0.5e20 m^02, ACOIL 0.4-1.6 sec for Locked-mode. Result: Density as programed. Got locked mode as requested. (SL is happy). Disruption at 1.67 s. Next: no dpcs change.
Sep 9 2010 09:35:34:940AM	1100909003	Yijun Lin	Program: 0.8 MA, 5.4 T, targe nl04 = 0.5e20 m^02, ACOIL 0.4-1.6 sec for Locked-mode. Result: Disruption at 1.71 s. Got locked mode at 0.74 s Bounced in startup. Next: same plasma, add DNB. add 1 ms in PG4 pre-puff (hope to eliminate the bouncer).
Sep 9 2010 09:57:34:020AM	1100909004	Yijun Lin	DPCS_XJUMP caused soft abort at 0.1212 sec. Plasma aborted. next: Add more PG3 gas puff. (0.01s/50 to 0.01s/60 and 0.1s/50 to 0.1s/60), to increase density in the startup, to reduce hards.
Sep 9 2010 10:07:21:567AM	1100909005	Yijun Lin	Program: 0.8 MA, 5.4 T, targe nl04 = 0.5e20 m^02, ACOIL 0.4-1.6 sec for Locked-mode. Result: Disruption at 1.70 s. Got locked mode So adding PG3 puff got rid of the hards (and dpcs_xjump soft abort) Next: Add 1 MW rf power. no change in dpcs.
Sep 9 2010 10:24:50:660AM	1100909006	Yijun Lin	Program: 0.8 MA, 5.4 T, targe nl04 = 0.5e20 m^02, ACOIL 0.4-1.6 sec for Locked-mode. Result: plasma full-length. startup ok Next: no dpcs change.
Sep 9 2010 10:41:55:737AM	1100909007	Yijun Lin	Program: 0.8 MA, 5.4 T, targe nl04 = 0.5e20 m^02, ACOIL 0.4-1.6 sec for Locked-mode. Result: plasma full-length. startup ok Next: no dpcs change.
Sep 9 2010 11:02:39:170AM	1100909008	Yijun Lin	Program: 0.8 MA, 5.4 T, targe nl04 = 0.5e20 m^02, ACOIL 0.4-1.6 sec for Locked-mode. Result: plasma full-length. startup ok Cell access after the shot Next: no dpcs change.
Sep 9 2010 11:53:07:043AM	1100909010	Yijun Lin	Program: 0.8 MA, 5.4 T, targe nl04 = 0.5e20 m^02, ACOIL 0.4-1.6 sec for Locked-mode. Result: plasma. disruption 1.67s. H-modes with ICRF. Startup ok. Next: no dpcs change. (change ICRF timing)
Sep 9 2010 12:06:16:857PM	1100909011	Yijun Lin	Program: 0.8 MA, 5.4 T, targe nl04 = 0.5e20 m^02, ACOIL 0.4-1.6 sec for Locked-mode. Result: plasma. disruption 1.67s. H-modes with ICRF. Startup ok. Next: no dpcs change.
Sep 9 2010 12:24:19:503PM	1100909012	Yijun Lin	Program: 0.8 MA, 5.4 T, targe nl04 = 0.5e20 m^02, ACOIL 0.4-1.6 sec for Locked-mode. Result: plasma. disruption 1.67s. H-modes with ICRF. Locked mode. Startup ok. Injection at 34 ms, but survived. a marfe was going to form (Dalpha peak) at 0.12 sec, but did not last. Next: no dpcs change. (Higher RF power)
Sep 9 2010 12:38:01:473PM	1100909013	Yijun Lin	Program: 0.8 MA, 5.4 T, targe nl04 = 0.5e20 m^02, ACOIL 0.4-1.6 sec for Locked-mode. Result: plasma. disruption 1.67s. H-modes with ICRF. Locked mode. A marfe forming at 0.12 sec, but decide not to do anything about it. Next: no dpcs change.
Sep 9 2010 12:52:01:497PM	1100909014	Yijun Lin	Program: 0.8 MA, 5.4 T, targe nl04 = 0.5e20 m^02, ACOIL 0.4-1.6 sec for Locked-mode. Result: plasma. disruption 1.69s. H-modes with ICRF. Locked mode. Next: no dpcs change.
Sep 9 2010 01:18:32:823PM	1100909015	Yijun Lin	Program: 0.8 MA, 5.4 T, targe nl04 = 0.5e20 m^02, ACOIL 0.4-1.6 sec for Locked-mode. Result: plasma. disruption 1.66s. H-modes with ICRF. Locked mode. Startup ok. Next: no dpcs change.
Sep 9 2010 01:29:59:287PM	1100909016	Yijun Lin	Program: 0.8 MA, 5.4 T, targe nl04 = 0.5e20 m^02, ACOIL 0.4-1.6 sec for Locked-mode. Result: plasma. disruption 1.66s. H-modes with ICRF. Locked mode. Startup ok Next: no dpcs change. (no RF) (SL plan part 2)
Sep 9 2010 01:44:37:883PM	1100909017	Yijun Lin	Program: 0.8 MA, 5.4 T, targe nl04 = 0.5e20 m^02, ACOIL 0.4-1.6 sec for Locked-mode. Result: plasma. full-length. Locked mode. Startup ok Next: no dpcs change. (with RF)
Sep 9 2010 02:01:17:797PM	1100909018	Yijun Lin	Program: 0.8 MA, 5.4 T, targe nl04 = 0.5e20 m^02, ACOIL 0.4-1.6 sec for Locked-mode. Result: plasma. full-length. Locked mode. Startup ok Next: no dpcs change.
Sep 9 2010 02:28:34:603PM	1100909019	Yijun Lin	Program: 0.8 MA, 5.4 T, targe nl04 = 0.5e20 m^02, ACOIL 0.4-1.6 sec for Locked-mode. Result: plasma. full-length. No locked mode. density was somewhat higher than last shot. (don't know why. Everything worked as programed.) Startup ok Next: Lower the nl04 point slightly at 0.38 sec (from 0.5e20 to 4.2e20). no other change.
Sep 9 2010 02:38:32:893PM	1100909020	Yijun Lin	Program: 0.8 MA, 5.4 T, targe nl04 = 0.5e20 m^02, ACOIL 0.4-1.6 sec for Locked-mode. Result: plasma. disruption 1.7 sec. locked mode. (maybe the small change of nl04 programing improved the density control) Startup ok Next: no dpcs change. (2 MW ICRF)
Sep 9 2010 02:50:34:467PM	1100909021	Yijun Lin	Program: 0.8 MA, 5.4 T, targe nl04 = 0.5e20 m^02, ACOIL 0.4-1.6 sec for Locked-mode. Result: plasma. disruption 1.7 sec. locked mode. Startup ok Next: no dpcs change. (2 MW ICRF)
Sep 9 2010 03:04:07:727PM	1100909022	Yijun Lin	Program: 0.8 MA, 5.4 T, targe nl04 = 0.5e20 m^02, ACOIL 0.4-1.6 sec for Locked-mode. Result: plasma. disruption 1.7 sec. locked mode. Startup ok Next: no dpcs change. (3 MW ICRF)
Sep 9 2010 03:22:23:650PM	1100909023	Yijun Lin	Program: 0.8 MA, 5.4 T, targe nl04 = 0.5e20 m^02, ACOIL 0.4-1.6 sec for Locked-mode. Result: plasma. disruption 1.76 sec. locked mode. Startup ok Next: no dpcs change. (3 MW ICRF)
Sep 9 2010 03:35:26:900PM	1100909024	Yijun Lin	Program: 0.8 MA, 5.4 T, targe nl04 = 0.5e20 m^02, ACOIL 0.4-1.6 sec for Locked-mode. Result: plasma. full length. locked mode. Startup ok (rather smooth current rise. the small bounce in the previous shots disappeared without doing anything) Next: no dpcs change. (3 MW ICRF)
Sep 9 2010 03:58:08:647PM	1100909025	Yijun Lin	Program: 0.8 MA, 5.4 T, targe nl04 = 0.5e20 m^02, ACOIL 0.4-1.6 sec for Locked-mode. Result: plasma. locked mode. disrupted at 1 sec just before RF. Startup ok. Concerning about melting the limiter at 3 MW Prf. Next: no dpcs change. (modulate RF)
Sep 9 2010 04:11:31:037PM	1100909026	Yijun Lin	fizzle. (post-disruption) (Ratiomatic gauge was turned off after the disruption). I don't know the pre-fill gas pressure. Presumably, it is too high. (Bill toggled it on after the shot). Next: shorten PG4 pre-fill by 2 ms.
Sep 9 2010 04:19:05:480PM	1100909027	Yijun Lin	Program: 0.8 MA, 5.4 T, targe nl04 = 0.5e20 m^02, ACOIL 0.4-1.6 sec for Locked-mode. Result: plasma. locked mode. Startup good. (maybe due to what I did, or not) Next: no dpcs change. (modulate RF)
Sep 9 2010 04:50:13:203PM	1100909029	Yijun Lin	Program: 0.8 MA, 5.4 T, targe nl04 = 0.5e20 m^02, ACOIL 0.4-1.6 sec for Locked-mode. Result: plasma. locked mode. Startup good. Next: no dpcs change. (modulate RF)
Sep 9 2010 05:00:23:900PM	1100909030	Yijun Lin	Program: 0.8 MA, 5.4 T, targe nl04 = 0.5e20 m^02, ACOIL 0.4-1.6 sec for Locked-mode. Result: plasma. locked mode. End of run.

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	08:58:00:373AM	Plasma	Ok
2	09:12:23:733AM	Plasma	Ok
3	09:25:33:180AM	Plasma	Ok
4	09:45:45:663AM	Plasma	Ok
5	09:59:29:043AM	Plasma	Ok
6	10:16:31:560AM	Plasma	Ok
7	10:32:29:043AM	Plasma	Ok
8	10:52:19:140AM	Plasma	Ok
9	11:30:02:640AM	Plasma	Ok
10	11:45:00:437AM	Plasma	Ok
11	12:01:11:787PM	Plasma	Ok
12	12:14:09:520PM	Plasma	Ok
13	12:29:35:077PM	Plasma	Ok
14	12:45:56:183PM	Plasma	Ok
15	01:08:47:620PM	Plasma	Ok
16	01:23:41:237PM	Plasma	Ok
17	01:38:21:853PM	Plasma	Ok
18	01:54:19:263PM	Plasma	Ok
19	02:13:19:060PM	Plasma	Ok
20	02:29:18:367PM	Plasma	Ok
21	02:43:04:273PM	Plasma	Ok
22	02:56:51:177PM	Plasma	Ok
23	03:12:34:840PM	Plasma	Ok
24	03:27:18:680PM	Plasma	Ok
25	03:44:59:303PM	Plasma	Ok
26	03:58:54:407PM	Plasma	Ok
27	04:11:53:050PM	Plasma	Ok
28	04:26:43:207PM	Plasma	Ok
29	04:42:24:517PM	Plasma	Ok
30	04:56:14:370PM	Plasma	Ok