Alcator C-Mod Run 1120906 Information

Miniproposals

Miniproposal: 722

Date Filed: 7/27/2012

Title: Assessment of LHCD efficiency and advanced scenario prospects of high Te I-mode plasmas

First Author: Amanda Hubbard

Session Leader: Amanda Hubbard (shots 1-30)

Operators
Session leader(s):	Amanda Hubbard
Physics operator(s):	Yijun Lin
Engineering operator(s):	Bill Parkin,Bill Byford,Roza Tesfaye

Engineering Operator Run Comment
MP 722 "Assessment of LHCD efficiency in high Te I-mode"

Session Leader Plans

Entered: Sep 5 2012 02:47:52:167PM

Author: Amanda Hubbard

Run plan for 1120906. MP 722 "Assessment of LHCD efficiency in high Te I-mode"

Session leader: Amanda Hubbard
Phys op: Yijun Lin.

Do NOT want overnight boronization.
DO want overnight ECDC, in HELIUM.
Request cryopump available, but do not turn on first thing (we may or may not use it).
Will need Neon available for seeding and D2 in NINJA near LH grill.

The objective of this run is simple: Couple LHCD into a high Te I-mode at moderate density, where we would typically be seeing 'density limits', and compare with colder plasmas at the same density, see if CD effects are larger.

Key diagnostics: HXR, edge density measurements (reflectometers, probes, including scanning probes if available), polarimeter, ECE, PDI probes.

Achieving it may not prove as simple; last week the SOL densities proved surpisingly low in this configuration. We will need to combine LHCD and ICRF, without melting anything. So, stay watchful and flexible.

Tentative run plan:

1). Reproduce good I-mode shot 1120829017 (5.8 T, 1.1 MA, nebar 1.0e20 m-3).
Check target density, about nel 5e19 I think. Adjust startup for NO cryopump.
3 MW ICRF, 0.7-1.1 secs; increase pulse length on subsequent shots to 0.7-1.3 s, using Ne seeding if injections or heating seen.

LH will monitor local density, may try to couple a little.

2) Try reducing Bt to 5.2 T, to put ICRF resonance on HFS rather than LFS (and thus further from outer limiter and shoelace antenna).
If we get equivalently good I-mode, will run here rest of day. If not, go back.
Again, monitor edge density.

3) Next shot, reduce Ip to 1 MA (same q95 as target shot). If hot I-mode still achieved, and SOL densities increase, will stay here. (don't want to go lower due to concerns about fast ions).

4) Once target shot determined, increase coupled LH. Starting 100 ms after I-mode, turning off 100 ms before it ends. Means to improve coupling include:

- reducing outer gap (while keeping loads on limiter and QC antenna reasonable).
- puffing from NINJA near LH launcher (while not increasing plasma density too much; if need be reduce the ohmic target.)

5). N// scan, from 1.9 to about 2.5, to determine maximum effect on HXR.

6) VERY IMPORTANT: Ohmic (or low P ICRF control shot with same density, N// lower Te. Measure HXR, polarimeter effects, etc.

7) Assuming some positive effects were seen at high Te, scan ICRF power over a few shots (L and/or I-mode) to determine its threshold.

Time permitting, and depending on results, repeat steps 4 and 5 at higher or lower densities; ideally we want to determine the density dependence at high Te.

Physics Operators Plans

Entered: Sep 5 2012 03:31:21:457PM

Author: Yijun Lin

1120906: MP 722 Assessment of LHCD efficiency and advanced scenario prospects of high Te I-mode plasmas

SL: A. Hubbard
PO: Y. Lin
-----------------
Engineering Setup
-----------------

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

Power systems as on: 1120829017

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

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)
leave B-div as is Hybrid DISABLED (PG6)
leave H-div as is Hybrid DISABLED (PG7)
Fill NINJA F-port with 10 psi D2 and DISABLED
Leave NINJA C-port as is and DISABLED

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

Torvac setup: keep gate valves open during pulse

Required systems: ICRF and LH
------------------------------------------
Boronization overnight: no
ECDC overnight: yes
ICRF: yes
LH: yes
Impurity injector: no
DNB: yes, if possible.
Cryopump: yes (but not first shot).
----------------------------------
------------------------------
ECDC Parameters: NOTE: HELIUM ECDC
-----------------------------
gas and pressure: HELIUM at 5.e-5 Torr
sweep: 44/45/103 cm
scan: 20/120 s
----------------------

Run plan:
Start with shot 1120829017 (5.8 T, 1.1 MA, nebar = 1.0e20, nl04 ~ 0.5e20), no cryopump.

see SL_plan for details.

Session Leader Summaries

Entered: Sep 6 2012 05:19:25:503PM

Author: Amanda Hubbard

Run summary for 1120906. MP 722 "Assessment of LHCD efficiency in high Te I-mode"

Session leader: Amanda Hubbard
Phys op: Yijun Lin.

A challenging run as expected. But, in the end we did get through essentially all of the run plan, and I think have the data to accomplish the assessment of LHCD efficiency at high Te. Although the quick assessment is that it likely is not dramatically different than at lower Te.

It was indeed hard to couple LHCD into an ICRF I-mode. The first 11 shots were unsuccessful due to high reflections. The steps needed, each of which helped to some degree, were

- Reducing gap (to < 1 cm) and making shape more up-down centered.
- Puffing gas in NINJA near LH grill.
- Reducing Ip to 1 MA.
- Using as little E-port power as possible (it reduces ne)
- TURNING UP THE FAULT LIMITS SO LH COULD RUN ANYWAY.

We managed to get LHCD into I-mode (or in some cases hot L-modes) at N//= 2.2, plus a few cases at N//=1.9 (eg shot 24) and N//=2.6 (shot 26, vry high reflections).

Shots 17, 18 and 26 were steadiest I-modes, many shots transitioned rather late; we were marginal on power and density. nebar was typically 1.3-1.5e20 m-3.

Ran ohmic target comparison shots with ne ramp in shots 27, 28 (same ne range, lower Te).

Last couple shots were at 900 kA; good plasmas but only brief LH pulses.

thanks to all - machine operators (no fizzles by Yijun!) LH and ICRF crews for a good run.

Tomorrow, more I-modes, no LH, all the ICRF!
(Steve Wukitch tuned up D-port today late in shot, got 5 MW total)

Physics Operator Summaries

Entered: Sep 6 2012 04:57:26:507PM

Author: Yijun Lin

PO-summary
The machine ran very well today. No fizzle.
Possible N2 leak after shot 25, 27, 28, 29, have slowed down the shot cycle.

score card:
shot attempt: 30
full plasma: 26
disruption: 3, (two early disruption, one at 1.4 sec)
fizzle: 0 (my 2nd fizzle-free PO run-day)
data test: 1 (first shot)

Session Leader Comments

Sep 6 2012 09:14:47:260AM 1120906002 Amanda Hubbard First plasma, 5.8 T, 1.06 MA. Disrupted at 0.67 s, before either ICRF or LH on.

Probably because density was much lower than expected, dropped to nel 3.5e19!
GOt to Te0= 5 keV (big sawteeth!).

Next shot, increase target ne, and enable Neon to be on the safe side.

Sep 6 2012 09:38:07:447AM 1120906003 Amanda Hubbard Nice I-mode this time. Te0 > 6 keV. But disrupted 1.08 s.

Density is dropping lower than in target shot, probably contributing. We will raise the next shot, before we start reducing gaps as LH wants, we need shots that survive.

Sep 6 2012 09:56:54:893AM 1120906004 Amanda Hubbard Nice I-mode again, full shot this time. Te0 > 6 keV.

Got desired target density nel 6e19 m-2, nebar ~ 10^20. This completes step 1 of run plan.

But, as we feared very low density at LH grill. Before we start reducing gaps, reduce Bt to 5.2 T to move ICRF resonance further from outboard hardware.

Sep 6 2012 10:12:17:403AM 1120906005 Amanda Hubbard Good shot, 5.2 T, 1.1 MA. Still get an I-mode, Te0 ~ 5 keV early (on GPC2 and FRCECE, GPC not yet recalibrated). Cools after 0.92 secs, probably linked to rising Prad. We will increase Neon next shot to try and deal with this.

This will be a suitable target shot. (Step 2) I don't see a good reason to reduce Ip (step 3) yet. Now we need to figure out how to get some LH into it - has been tripping due to low grill density. (Step 4).

We will start by reducing the outer gap from 1.7 mm to about 1 cm.

Sep 6 2012 10:25:11:337AM 1120906006 Amanda Hubbard Similar shot, still no LH coupled.

I-mode at least until 1 sec. Edge cools at 1 s. Prad still rising to 1.5 MW, think we are heating the divertor. Will try some strike pt sweeping, and reduce outer gap more for LH.

Sep 6 2012 10:43:37:607AM 1120906007 Amanda Hubbard Good I-mode again. Smaller gap (about 7 mm) but ngrill still too low.

Will try the famous LH grill NINJA next shot.

Edge Te cooling is delayed to 1.05 s, maybe the strike pt sweep helped. The NINJA may help with that and the ne droop (to nebar 9e19 m-3) we are seeing. These will all be issues when we get to extending the pulse lengths. But first we need to couple some LH.

Sep 6 2012 10:49:23:387AM 1120906008 Amanda Hubbard Disrupted before either RF or NINJA came on.

Sep 6 2012 11:13:15:540AM 1120906009 Amanda Hubbard Full shot, with some edge cooling mid pulse. Density still too low at grill, esp during ICRF.

Next: try to center plasma vertically on grill.

Sep 6 2012 11:21:23:090AM 1120906010 Amanda Hubbard THis was a hotter, steadier, I-mode discharge; the centering of the plasma may have improved some PFC interaction. 130 kJ, Te0 6 keV, Te8 1.1 keV (cools after 1.05 s when Prad rises, 1 MW until then.

But, LH still not coupling, even in the ohmic period.

Sep 6 2012 11:33:00:263AM 1120906011 Amanda Hubbard Good shot, but no LH at all. Extended J longer, reverted to L-mode in that period.

Sep 6 2012 11:39:50:443AM 1120906011 Amanda Hubbard Good shot, but no LH at all. Extended J longer, reverted to L-mode in that period. LH crew reports local density is lower when E on.

Sep 6 2012 11:53:19:243AM 1120906012 Amanda Hubbard First shot where some LH is coupled - trip levels were raised. Reflections are still very high (70% to 40%). NINJA puff (<~ 1 sec) did help, but also raised target density, from nebar 1.2 (higher than a few shots ago) to 1.5. They will back off.

Next shot: Reduce Ip to 1 MA, see if it affects SOL lengths. Better keep a close eye on limiter....

Sep 6 2012 12:14:23:283PM 1120906013 Amanda Hubbard Good. 1 MA. Nebar 1.1-1.3. Coupled 200-400 kW LH.

From ECE, looks like more effect in the ohmic period, not what is expected. But ne is a little lower.

Note: At today's field, should use GPC2 channels 7 or lower, eg Ch 6, for non-thermals, not Ch 10.

Sep 6 2012 12:17:09:930PM 1120906014 Amanda Hubbard Used 2.6 MW J+ 0.5 E. This gave good hot plasma, and better LH (but still high reflections). Definitely some non-thermals on ECE. nebar 1.2-1.5e20.

Next: Try just J-port. Don't think this will be an I-mode but you never know.

Sep 6 2012 12:37:16:023PM 1120906015 Amanda Hubbard 2.5 MW, J-port only. We did get an I-mode, but as expected, rather marginal and late, ~ sec. This would make seeing small changes due to LHCD hard. Greg reports coupling not all that much better. So we will go back to the waveforms of shot 14, start modifying the timing of ICRF and LH to see the effects more clearly. And hopefully raise the LH power.

Sep 6 2012 12:52:33:670PM 1120906016 Amanda Hubbard 3 MW ICRF. I-mode still comes rather late, about 940 ms, which reduces Prad and ne. Did get about 3 keV non-thermal ECE.

Sep 6 2012 01:20:31:270PM 1120906017 Amanda Hubbard Good shot for the MP. Steady hot plasma, with LH ~ 400 kW, N//=1.3-1.5.

Small effect on ECE. Should have HXR data.

Sep 6 2012 01:47:04:677PM 1120906018 Amanda Hubbard Another very good shot, steady hot plasma, with ~ 500 kW LH mid I-mode,

SHoudl be good data at turnoff. But, nebar by then is 1.5e20, more than we had wanted (shot 17 also). So, repeat with lower target ne.

As I feared, Ian reports little HXR response on this shot and 17, more on 16 and 19.

Sep 6 2012 01:41:38:467PM 1120906019 Amanda Hubbard Lower target density gave a lower density in flat top (1.1e20 m-3), but unfortunately a much less steady shot. I mode didn't come until about 0.9 s, perhaps triggered by NINJA puff?? Did get more ECE, but will be hard to sort out transients. By LH turnoff, ne is up to 1.3e20, and ECE effect is small.

Try going back to higher target, turning off NINJA puff. Can LH couple without it?

Sep 6 2012 02:06:52:050PM 1120906020 Amanda Hubbard Turning off the NINJA gave no LH power; not a good thing. Also resulted in another very late I-mode (after 1 sec).

Did give lower density, nebar 1.3 to 1e20.

Next, turn NINJA puff back on, earlier (0.8 s).

Sep 6 2012 02:17:21:003PM 1120906021 Amanda Hubbard Low density discharge, but again not very steady - Confinement transition not until after 1 second. Density drops throughout pulse.

LH issue prevents any power.

Raise target density to nel 6.5ee19 and repeat.

Sep 6 2012 02:29:29:880PM 1120906022 Amanda Hubbard Got good LH this time, but many trips in ICRF (J-port). Result was a moderately hot L-mode. Some ECE response to the LH. nebar 1.2 to 1.5 to 1.3e20; NINJA puff is having quite a big effect I think.

Rebalance J and E. And hope LH still couples.

Sep 6 2012 02:51:17:753PM 1120906023 Amanda Hubbard Good ICRF and LH. Te0 5 keV, Te8 below 1 keV, not an I-mode except perhaps at very end of ICRF pulse (after LH). nebar ~ 1.5e20 during LH.

Should have good data on the LH effect at turnoff (I think it was small, though).

Next: Try some N// variation.

Sep 6 2012 03:07:50:957PM 1120906024 Amanda Hubbard Good ICRF and LH. N//=1.9

This time got a short, late, I-mode 1.04-1.16 s, complicating interpretation of HXR I expect. Do see ECE turnoff, ~1 keV. nebar 1.5 - 1.4 during LH.

Next: Repeat trying more E-port power. See if coupling can handle it.

Sep 6 2012 03:34:51:453PM 1120906025 Amanda Hubbard Good ICRF and LH. N//=1.9 Higher ICRF power. 3.7 MW.

Again got a short, late, I-mode 1.04-1.16 s, complicating interpretation of HXR I expect. Do see ECE turnoff, ~1 keV. A second I-mode after 1.2 s.
Next higher N//.

And Cornwall will delay his NINJA puff from 0.8 to 0.9 secs (moving it earlier is one of the few changes we've made since the better shots 17 and 18).

Sep 6 2012 03:59:34:350PM 1120906026 Amanda Hubbard Got the early I-mode back, steady until after LH. Looks like the earlier NINJA puff was the problem (mea culpa, I asked for the change).

Good ICRF. N//=2.5 High reflected power, so low (350 - 200 kW) forward power. But enough I hope to see any LH effects. I do see some ECE rise, which is higher than at lower N//.

Next, we will turn off ICRF, program ne ramps during LHCD, to get a low Te comparison for the analysis and modeling.

Sep 6 2012 04:02:10:953PM 1120906027 Amanda Hubbard Comparison shot, with ne ramp and LHCD N// 1.9.

nebar is 1.2 -1.35e20 during ICRF, which is 660 kW. Got more ECE response than we've had all day - so much for the 'high Te is good' theory. Though ne and power may not be quite comparable.

next, repeat at N//=2.2, increase ne ramp.

Sep 6 2012 04:35:52:880PM 1120906028 Amanda Hubbard Another good comparison shot, with ne ramp and LHCD N// 2.2.

nebar is 1.2 -1.6e20 during ICRF, which is 600 kW. Good, covered the range of most of today's ICRF shots, for comparison of HXR, PDI etc.

Next, try for a 900 kA I-mode.

Sep 6 2012 04:49:42:413PM 1120906029 Amanda Hubbard 900 kA, with 3 MW ICRF. Got a hot L-mode, no sign of limiter heating. LH tripped early. nebar ~ 1.3e20m-3.

Repeat with

- slightly lower target ne.
- 0.5 MW more ICRF, and power to 1.4 s for better baseline.
- LH staying on.

(too late in the day for one thing at a time...)

Sep 6 2012 05:05:03:140PM 1120906030 Amanda Hubbard Very similar, both the plasma and (unfortunately) the LH; only a short pulse. Got an I-mode this time, but after LHCD. 6 keV!

I aw ~ 700 eV non-thermal response, Ian reports no HXR. But a short and low power LH pulse.

Thanks everyone! We proved LH and ICRF CAN play together, with a little nudging.

Physics Operator Comments

Sep 6 2012 09:30:08:700AM 1120906002 Yijun Lin shot 1: loaded segment 2 from 1120829017, segment 1 from 1120905002,
Neon disabled. no cryopump
ICRF 0.7-1.1 sec
LH 0.8-1.3 sec

Load at 6-Sep-2012 08:53:57.00
Open tree /home/ylin/pcs_scratch -1
Open tree done

result: disrupted at 0.68. no RF.
next: raise nl04 to 0.5e20, and enable neon (150 ms)

Sep 6 2012 09:35:58:567AM 1120906003 Yijun Lin added neon 150 ms (PG1), raise nl04 to 0.5e20.

Load at 6-Sep-2012 09:09:18.00
Open tree /home/ylin/pcs_scratch -1
Open tree done

result: I-mode. disrupted at 1.09 sec. possibly heating something.

next shot: raise density to 0.6
Load at 6-Sep-2012 09:35:02.00
Open tree /home/ylin/pcs_scratch -1
Open tree done

Sep 6 2012 09:47:58:487AM 1120906004 Yijun Lin raise density to 0.6e20.
result: full plasma. Hot I-mode (Te0 ~ 7.7 keV)

next shot: lower field to 5.2 T (TF 145.7 kA). no other change.

Load at 6-Sep-2012 09:47:06.00
Open tree /home/ylin/pcs_scratch -1
Open tree done

Sep 6 2012 10:08:41:877AM 1120906005 Yijun Lin lower field to 5.2 T.

result: full plasma.

next shot: Neon 200 ms (60%).
Reduce outer gap by 7 mm to 10 mm. (for LH coupling)

Load at 6-Sep-2012 10:05:51.00
Open tree /home/ylin/pcs_scratch -1
Open tree done

Sep 6 2012 10:28:02:853AM 1120906006 Yijun Lin Programed outer gap to 10 mm, got 10 mm.

result: full plasma. got a little LH.

next shot:
Add a little strike point sweep 0.9-1.1 sec...(only touched ZXL)
reduce outergap to 5 mm.

Load at 6-Sep-2012 10:27:22.00
Open tree /home/ylin/pcs_scratch -1
Open tree done

Sep 6 2012 10:41:42:500AM 1120906007 Yijun Lin Programed outer gap to 5 mm, got 7 mm.
no more hot spot in divertor (the strike point sweep might have helped)

result: full plasma. got a little LH.

next shot: add NINJA puff from C-Port. (Controlled by M. Churchill and C. Lau)

Sep 6 2012 10:42:13:963AM 1120906007 Yijun Lin Programed outer gap to 5 mm, got 7 mm.
no more hot spot in divertor (the strike point sweep might have helped)

result: full plasma. got a little LH.

next shot: add NINJA puff from C-Port. (Controlled by M. Churchill and C. Lau)

Load at 6-Sep-2012 10:42:05.00
Open tree /home/ylin/pcs_scratch -1
Open tree done

Sep 6 2012 10:51:35:593AM 1120906008 Yijun Lin with NINJA puff.

result: disrupted at 0.53 sec. impurity injection...

next: repeat. no PCS change.

Sep 6 2012 11:10:16:077AM 1120906009 Yijun Lin with NINJA puff.

result: full length. LH was still struggling.

next: move Zcur down by 7 mm..

Load at 6-Sep-2012 11:10:09.00
Open tree /home/ylin/pcs_scratch -1
Open tree done

Sep 6 2012 11:24:05:833AM 1120906010 Yijun Lin result: full length. LH was still struggling (even in ohmic part)

next: Lengthen Ar puff to 125 ms per Matt Reinke's remote request.
also some NINJA change.

Load at 6-Sep-2012 11:22:52.00
Open tree /home/ylin/pcs_scratch -1
Open tree done

Sep 6 2012 11:32:15:687AM 1120906011 Yijun Lin result: full length. LH was to dummyload (LH-OP error)

next: no PCS change.

Sep 6 2012 11:50:39:833AM 1120906012 Yijun Lin result: full length. LH power good (after adjusting trip level)

next: lower Ip to 1 MA. lower NINJA pressure. no other changes.

Load at 6-Sep-2012 11:50:26.00
Open tree /home/ylin/pcs_scratch -1
Open tree done

Sep 6 2012 12:05:36:717PM 1120906013 Yijun Lin result: full length. 1 MA.

next: no pcs change. (change ICRF. lower E, higher J)

Sep 6 2012 12:15:36:593PM 1120906014 Yijun Lin result: full length. LH had power in.

next: no pcs change. (change ICRF. J only).

Sep 6 2012 12:32:51:550PM 1120906015 Yijun Lin result: full length.

next: reduce outer gap by 2 mm.

Load at 6-Sep-2012 12:29:40.00
Open tree /home/ylin/pcs_scratch -1
Open tree done

Sep 6 2012 12:51:11:380PM 1120906016 Yijun Lin result: full length.

next: Neon puff 250 ms (60%)

Load at 6-Sep-2012 12:51:02.00
Open tree /home/ylin/pcs_scratch -1
Open tree done

Sep 6 2012 01:05:27:580PM 1120906017 Yijun Lin result: plasma full length. (250 ms Neon)

next: no pcs change.

Sep 6 2012 01:15:49:650PM 1120906018 Yijun Lin result: plasma full length.
next: lower target nl04 to 0.5e20 from 0.6e20.

Load at 6-Sep-2012 13:15:31.00
Open tree /home/ylin/pcs_scratch -1
Open tree done

Sep 6 2012 01:39:22:690PM 1120906019 Yijun Lin result: plasma full length.

next: raise target density back to 0.6, turn off NINJA

Load at 6-Sep-2012 13:39:09.00
Open tree /home/ylin/pcs_scratch -1
Open tree done

Sep 6 2012 02:00:02:420PM 1120906020 Yijun Lin result: plasma, disrupted 1.4 sec. LH faulted out.

next: add back NINJA puff. no pcs change.

Sep 6 2012 02:16:38:640PM 1120906021 Yijun Lin result: plasma, full length. LH faulted out.

next: raise nl04 to 0.65e20
Load at 6-Sep-2012 14:16:30.00
Open tree /home/ylin/pcs_scratch -1
Open tree done

Sep 6 2012 02:32:59:003PM 1120906022 Yijun Lin result: plasma, full length. raised density, got LH, but many ICRF faults

next: no pcs change.

Sep 6 2012 02:48:05:020PM 1120906023 Yijun Lin result: plasma, full length. good LH, good ICRF, but I-mode?

next: no pcs change. vary LH N//

Sep 6 2012 03:03:36:397PM 1120906024 Yijun Lin result: plasma, full length. good LH, good ICRF

next: no pcs change. (raise ICRF power)

Sep 6 2012 03:35:25:610PM 1120906025 Yijun Lin result: plasma, full length. good LH, good ICRF, but I-mode?

next: no pcs change. move NINJA later.
seems there is a N2 leak..

Sep 6 2012 03:50:25:817PM 1120906026 Yijun Lin result: plasma, full length. got LH and ICRF. and I-mode is back.

next: density ramp during LH...(nl04 0.6-0.8 at 1.1 sec)

Load at 6-Sep-2012 15:50:20.00
Open tree /home/ylin/pcs_scratch -1
Open tree done

Sep 6 2012 03:59:35:493PM 1120906027 Yijun Lin result: plasma, full length. got LH and ICRF.
with nl04 ramp..

next: no pcs change. raise target density to 0.9e20 at the end of rampup.

Sep 6 2012 04:08:08:523PM 1120906027 Yijun Lin result: plasma, full length. got LH and ICRF.
with nl04 ramp..

next: no pcs change. raise target density to 1.0e20 at the end of rampup.
Load at 6-Sep-2012 16:01:15.00
Open tree /home/ylin/pcs_scratch -1
Open tree done

Seems to be another N2 leak.

Sep 6 2012 04:25:12:793PM 1120906028 Yijun Lin result: plasma full length

next: reload shot 26, reduce Ip to 900 kA.

Load at 6-Sep-2012 16:25:07.00
Open tree /home/ylin/pcs_scratch -1
Open tree done

Sep 6 2012 04:43:41:697PM 1120906029 Yijun Lin result: plasma full length. LH faulted out

next: lower target nl04 0.5e20. no other changes.

Sep 6 2012 04:57:23:173PM 1120906030 Yijun Lin result: plasma full length

end of run.

Engineering Operator Comments

Shot Time Type Status Comment

1 07:28:32:720AM Test Ok cycle test OK, but no Pat

2 09:01:18:633AM Plasma Ok

3 09:24:14:610AM Plasma Ok

4 09:36:56:220AM Plasma Ok

5 09:55:20:420AM Plasma Ok

6 10:14:00:093AM Plasma Ok

7 10:28:18:030AM Plasma Ok

8 10:42:59:013AM Plasma Ok

9 10:56:15:030AM Plasma Ok

10 11:10:58:177AM Plasma Ok

11 11:26:55:890AM Plasma Ok

12 11:39:58:593AM Plasma Ok

13 11:53:45:880AM Plasma Ok

14 12:06:28:430PM Plasma Ok

15 12:20:43:177PM Plasma Ok

16 12:38:28:620PM Plasma Ok

17 12:52:13:307PM Plasma Ok

18 01:07:33:427PM Plasma Ok

19 01:25:20:927PM Plasma Ok

20 01:50:33:260PM Plasma Ok

21 02:04:46:387PM Plasma Ok

22 02:19:57:533PM Plasma Ok

23 02:34:32:843PM Plasma Ok

24 02:55:56:213PM Plasma Ok

25 03:11:01:950PM Plasma Ok

26 03:38:57:243PM Plasma Ok

27 03:52:27:473PM Plasma Ok

28 04:15:19:170PM Plasma Ok

29 04:35:14:653PM Plasma Ok

30 04:55:23:717PM Plasma Ok

System Availability

Sep 6 2012 07:28:14:267AM

System Available Comment Availability
Changed Owner Description Who Can
Change
Active MHD no secured - tagged out Jun 2 2008 11:03:58:433AM (sears) Joe Snipes Active MHD Antenna golfit
BES yes BES system is online Nov 22 2011 02:21:12:050PM (bespam) Bill Rowan Beam Emission Spectroscopy bespam,liao,rowan
Bolometers yes Midplane diodes functioning properly. Midplane bolometers working and calibrated. DIV bolometers installed but not yet toaster calibrated Apr 20 2012 09:57:29:520AM (mlreinke) Matt Reinke Bolometers hutch,mlreinke
Boronization yes Jun 15 2012 05:02:46:313PM (dekow) Jim Irby Boronization dekow,irby
CECE yes The system is currently operational for Te tilde measurement. Talk to Choongki about the current configuration Jul 3 2012 04:38:00:317PM (nthoward) Anne White Correlation ECE nthoward,sck83,whitea
CNPA yes Multiple channel CNPA available, no safety risk for in-vessel access Apr 14 2011 12:01:59:693PM (parker) Ron Parker Compact Neutral Analyzer parker
Cryopump - Upper Divertor yes Jun 15 2012 05:02:31:550PM (dekow) Brian LaBombard Upper Divertor Cryopump dekow,irby,labombard
CXRS yes core-CXRS system is online Nov 22 2011 02:21:22:280PM (bespam) Bill Rowan Charge Exchange Spectroscopy bespam,blip,liao,rachmcd,rowan
CXRS edge yes Michael CHurchill has primary responsibility at the moment Apr 19 2011 11:44:46:247AM (blip) Bruce Lipshultz Measurement of CXR light in the pedestal region at both the high- and low-field sides blip,rmchurch
D Alpha yes \ha2_bright is available; \SPECTROSCOPY::TOP.VUV.VIS_SIGNALS:MCP_VIS_SIG1 is not available Jul 1 2009 09:45:41:090AM (terry) Jim Terry Balmer Alpha Monitor irby,terry,wolfe
Dalsa no system is is installed and aligned, but not functional (appears to be a broken cable) Dec 5 2011 02:41:42:867PM (marmar) Earl Marmar Visible Bremsstrahlung Imaging marmar
Disruption Mitigation yes two gas jet valves active as of Feb 2012 May 15 2012 10:09:23:597AM (granetz) Robert Granetz Gas Jet granetz,whyte
Divertor IR no Mar 6 2007 10:50:41:677AM Glen Wurden Divertor IR Digital Video gwurden,terry
Divertor IR Spectroscopy no Mar 6 2007 10:51:39:897AM Glen Wurden Divertor IR Spectroscopy gwurden,terry
DMBolo AXUV diodes yes Diodes are taking usable data. Not all post-processing code is working yet. Feb 1 2012 01:24:23:953PM (golynyk) Geoff Olynyk Set of six AXUV diodes in a toroidal array of midplane wall boxes. golynyk,granetz,mlreinke,whyte
DNB yes "The beam could break at any moment." May 15 2012 10:09:52:470AM (granetz) Robert Granetz Diagnostic Neutral Beam dterry,granetz,mochung
ECDC yes Apr 26 2012 03:23:19:057PM (dekow) Jim Irby 2.45 GHz, 3 kW, discharge cleaning system dekow,irby,pfeiffer
FRC-ECE yes FRC-ECE is online May 14 2012 11:53:01:693AM (bespam) Perry Phillips Heterodyne ECE-32 channels bespam,liao,phillips,rowan,whitea
FTCI yes System Operational May 14 2012 11:50:45:590AM (irby) Jim Irby Fast two-color interferometer irby
G-Side Ratiomatic yes Installed April 25,2012. New controller installed 5/29/2012 Jun 7 2012 10:40:00:957AM (toland) Brian LaBombard G-side ratiomatic ionization gauge labombard,toland
Glow Discharge no HV cables disconnected and power supplies off. Electrical plugs have been disconnected, capped and red tagged. Mar 5 2012 10:21:53:460AM (dekow) Jim Irby 1 kV, 5 A, glow discharge system dekow,dterry,irby
GPC yes Operational Apr 27 2012 07:41:46:907AM (hubbard) Amanda Hubbard ECE Polychromater hubbard
GPC2 yes Operational Apr 27 2012 07:42:03:317AM (hubbard) Amanda Hubbard ECE Polychromater hubbard
GPI yes The Xpt-view, the midplane-view cameras are operational. The innerwall GPI (coupled to the fast-diodes) is available. Jul 1 2009 09:45:50:933AM (terry) Jim Terry Gas Puff Imaging terry,zweben
H/D yes system is functional and taking data Dec 5 2011 02:42:29:857PM (marmar) Earl Marmar H/D Ratio marmar
HEAT yes Apr 26 2012 03:23:49:607PM (dekow) Gary Dekow - Machine Heaters - burke,dekow
Hirex Jr yes Hirex-Jr has been installed Jun 28 2010 03:36:33:420PM (rice) John Rice High Resolution X-Ray ince,rice
Hirex Sr yes Installed and aligned. Will be available for Ti/Vr profiles after focusing tests and locked modes are taken. Dec 6 2011 08:21:02:453AM (ypodpaly) John Rice High Resolution X-Ray cgao,ldelgado,rice,ypodpaly
HXR yes 32 Channels operational,, no safety risk for in-vessel access Apr 14 2011 12:05:24:810PM (parker) Ron Parker Hard X-Ray Array faust,parker,schmidt
ICRF D-Antenna yes May 31 2012 09:20:06:827AM (wukitch) Steve Wukitch D-port antenna wukitch,ylin
ICRF E-Antenna yes May 31 2012 09:19:57:640AM (wukitch) Steve Wukitch E-port antenna wukitch,ylin
ICRF J-Antenna yes May 31 2012 09:19:47:443AM (wukitch) Steve Wukitch J-port antenna wukitch,ylin
Impurity Spectroscopy yes Being upgraded with better optics and new spectrographs. Dan Miller has primary responsibility. Apr 19 2011 11:46:02:193AM (blip) Bruce Lipshultz Measurement of recycling light and impurity source rates at multiple surfaces around the tokamak blip,miller
Laser Blow-Off yes Pumped Down, Laser has not yet been tested but otherwise operational May 14 2012 04:31:17:037PM (nthoward) Martin Greenwald Impurity Injection System g,nthoward
Lower Hybrid yes LH is now available for plasma operation up to ~900 kW net power. Jul 3 2012 02:50:00:693PM (wallaceg) Ron Parker Lower Hybrid dterry,parker,wallaceg
Lower Hybrid Reflectometer no off Apr 15 2011 08:24:27:930AM (dominguez) Arturo Dominguez Lower Hybrid Reflectometer dominguez,marmar,parker,sgbaek
LoWEUS yes LoWEUS viewing the 10-30 nm region, spectral brightness vs. lambda and time are being stored in tree. Apr 20 2012 10:43:34:077AM (mlreinke) Matthew L. Reinke Long Wavelength Extreme Ultraviolet Spectrometer markchil,mlreinke
LPI no Beam line removed May 30 2008 02:09:12:833PM (bose) Earl Marmar Lithium Pellet Injector bose,marmar
Ly-alpha no Midplane Lyman-a not functioning. New B-PORT Lyman (BPLY) still being debugged. Jul 12 2012 08:52:28:233AM (mlreinke) Matt Reinke Lyman alpha cameras faustian,labombard,mlreinke
Magnetics yes Dec 1 2011 11:51:51:970AM (g) Robert Granetz Bp coils and flux loops for equilibrium control granetz,wolfe
McPherson no McPherson under vacuum but is not run on a day-to-day basis. Can be requested if desired. LoWEUS has taken over as the primary Mo monitor. Jul 12 2012 08:53:14:937AM (mlreinke) Jim Terry VUV Spectrometer markchil,mlreinke,terry
Michelson yes Vacuum 3-4e-8 T. Starting with Michelson at reduced speed. Apr 27 2012 07:42:41:960AM (hubbard) Amanda Hubbard ECE Te Profiles hubbard,schmidt
MKS yes Dec 2 2011 12:27:47:163PM (toland) Brian LaBombard Baratron pressure gauges labombard,toland
MLP yes Operational. Connected to A-port probe system May 10 2012 08:40:19:910AM (labombard) Brian LaBombard Mirror Langmuir Probe Electronics System labombard
MSE yes 2/29/2012 MSE operational. No HV or vacuum safety issues Feb 29 2012 12:26:13:863PM (sscott) Steve Scott Motional Stark Effect jinseok,sscott
Neutrons yes Voltage is on for He3 detectors on J port. Remaining voltages will be turned on for the first run. Apr 23 2012 09:31:22:063AM (fiore) Catherine Fiore Neutron Detectors fiore
Neuts and Hards yes All detectors Powered On --- Waiting for neutrons for calibration Nov 22 2011 01:05:24:380PM (irby) Jim Irby X-Ray/Neutron Detectors at K-Hor irby
NINJA yes C-bottom and new F-bottom system ready. Dec 2 2011 12:28:44:843PM (toland) Brian LaBombard NINJA gas puff labombard,terry,toland
PCI yes Operational. Jul 10 2012 07:08:06:883PM (ntsujii) Miklos Porkolab Phase Contrast Imaging emd,ennever,ntsujii,porkolab
Penning Gauges yes HV power supplies turned ON in INIT, off in RECOOL May 10 2012 08:41:03:000AM (labombard) Brian LaBombard Penning Ionization Gauges labombard
Plasma TV yes WIDE1, WIDE2 (chan 33), DANT, JANT and DIV are operational. Jul 1 2009 09:46:29:543AM (terry) Jim Terry Video of plasma via several cameras dekow,irby,terry,wolfe
Polarimeter yes 3 chords operational but with high noise level Jan 6 2012 04:22:20:903PM (irby) Jim Irby C-Mod Polarimeter irby
Power - Alternator Air Switch yes Apr 26 2012 03:24:21:607PM (dekow) Gary Dekow Alternator to Power Room Power Supply Connection cochran,dekow,dterry,irby
Power - PEI yes Apr 26 2012 03:24:41:250PM (dekow) Gary Dekow PEI System cochran,dekow,dterry,irby
Power - TMX yes Apr 26 2012 03:24:57:153PM (dekow) Gary Dekow Ef2s,. EFCs and A-Coils byford,cochran,dekow,dterry,irby
Power Systems yes Apr 26 2012 03:25:14:497PM (dekow) Jim Irby C-Mod Magnet Supplies byford,cochran,dekow,dterry,irby
Probe Array - ISD yes Operational. Some dead probes. May 10 2012 08:41:58:120AM (labombard) Brian Labombard Inner Lower Divertor Probe Array labombard
Probe Array - LH yes Operational. 4 out of 6 probes working. May 10 2012 08:41:40:557AM (labombard) Brian LaBombard Lower Hybrid Probe Array labombard
Probe Array - OSD yes Operational. May 10 2012 08:42:13:733AM (labombard) Brian LaBombard Outer Lower Divertor Probe Array (F and J) labombard
Probe Array - UDIV yes Operational. Some dead probes. May 10 2012 08:42:32:663AM (labombard) Brian LaBombard Upper Divertor Probe Array labombard
Reflectometer yes On 1120608, the high frequency channels: 112, 140 and the variable, have been disconnected for some troubleshooting. All other channels are connected Jun 14 2012 11:28:59:603AM (dominguez) Earl Marmar Reflectometer dominguez,marmar
Scanning Probe - ASP yes Operational. A variety of probe heads are ready for use. May 10 2012 08:43:10:937AM (labombard) Brian LaBombard A-Port Scanning Probe labombard
Scanning Probe - FSP yes Operational. May 10 2012 08:43:24:887AM (labombard) Brian LaBombard F-Port Scanning Probe labombard
Scanning Probe - WASP no Not functioning. Probe tips are melted. Repair not performed during break. May 10 2012 08:44:43:137AM (labombard) Brian LaBombard Inner Wall Scanning Probe labombard,nsmick
Shoelace Antenna yes Operational May 10 2012 08:45:08:320AM (labombard) Brian LaBombard High-k active MHD antenna, for QCM, WCM studies golfit,labombard
SOL reflectometer yes c-port (top, middle, bottom) and h-port available. Only 1 of 4 locations can be used for each discharge May 1 2012 04:54:58:820PM (cornwall) Cornwall Lau SOL reflectometer cornwall,wukitch,ylin
Sparker yes Sparker Power Supply powered up. Connected at K port using red cable 4/23/12 9:25AM Apr 23 2012 12:06:10:983PM (parkin) Jim Irby Field Emission Preionization for C-Mod dekow,irby,parkin
Surface Science Station yes SSS is under vacuum and fully available. Jul 3 2012 02:46:59:753PM (ochoukov) Bruce Lipschultz Radially scanning probe located on K-port blip,ochoukov
TCI yes TCI lasers in operation May 14 2012 11:51:18:700AM (irby) Jim Irby Two-Color Interferometer irby,murray
TS - Core yes Operating with both lasers, density calibration ongoing. Jul 19 2012 10:20:09:220AM (jrwalk) Jerry Hughes Core Thomson scattering jrwalk,jwhughes,yma
TS - Edge yes Operating with both lasers, density calibration ongoing. Jul 19 2012 10:20:28:323AM (jrwalk) Jerry Hughes Millimeter resolution edge Thomson scattering jrwalk,jwhughes,yma
Vispec no 350 and 670 nm, 4 spatial channels Nov 28 2007 09:58:35:493AM (agraf) Alex Graf Visible Spectrometer agraf
XEUS yes XEUS viewing the 1-6 nm region, spectral brightness vs. lambda and time are being stored in tree. Apr 20 2012 10:43:43:107AM (mlreinke) Matt Reinke X-ray Extended Ultraviolet Spectrometer markchil,mlreinke
XTOMO yes ARRAY1->5 available. Specific channels on various arrays display issues. Apr 20 2012 05:36:28:523PM (faustian) Robert Granetz X-Ray Tomography faustian,granetz,mlreinke

Session Leader Comments
Sep 6 2012 09:14:47:260AM	1120906002	Amanda Hubbard	First plasma, 5.8 T, 1.06 MA. Disrupted at 0.67 s, before either ICRF or LH on. Probably because density was much lower than expected, dropped to nel 3.5e19! GOt to Te0= 5 keV (big sawteeth!). Next shot, increase target ne, and enable Neon to be on the safe side.
Sep 6 2012 09:38:07:447AM	1120906003	Amanda Hubbard	Nice I-mode this time. Te0 > 6 keV. But disrupted 1.08 s. Density is dropping lower than in target shot, probably contributing. We will raise the next shot, before we start reducing gaps as LH wants, we need shots that survive.
Sep 6 2012 09:56:54:893AM	1120906004	Amanda Hubbard	Nice I-mode again, full shot this time. Te0 > 6 keV. Got desired target density nel 6e19 m-2, nebar ~ 10^20. This completes step 1 of run plan. But, as we feared very low density at LH grill. Before we start reducing gaps, reduce Bt to 5.2 T to move ICRF resonance further from outboard hardware.
Sep 6 2012 10:12:17:403AM	1120906005	Amanda Hubbard	Good shot, 5.2 T, 1.1 MA. Still get an I-mode, Te0 ~ 5 keV early (on GPC2 and FRCECE, GPC not yet recalibrated). Cools after 0.92 secs, probably linked to rising Prad. We will increase Neon next shot to try and deal with this. This will be a suitable target shot. (Step 2) I don't see a good reason to reduce Ip (step 3) yet. Now we need to figure out how to get some LH into it - has been tripping due to low grill density. (Step 4). We will start by reducing the outer gap from 1.7 mm to about 1 cm.
Sep 6 2012 10:25:11:337AM	1120906006	Amanda Hubbard	Similar shot, still no LH coupled. I-mode at least until 1 sec. Edge cools at 1 s. Prad still rising to 1.5 MW, think we are heating the divertor. Will try some strike pt sweeping, and reduce outer gap more for LH.
Sep 6 2012 10:43:37:607AM	1120906007	Amanda Hubbard	Good I-mode again. Smaller gap (about 7 mm) but ngrill still too low. Will try the famous LH grill NINJA next shot. Edge Te cooling is delayed to 1.05 s, maybe the strike pt sweep helped. The NINJA may help with that and the ne droop (to nebar 9e19 m-3) we are seeing. These will all be issues when we get to extending the pulse lengths. But first we need to couple some LH.
Sep 6 2012 10:49:23:387AM	1120906008	Amanda Hubbard	Disrupted before either RF or NINJA came on.
Sep 6 2012 11:13:15:540AM	1120906009	Amanda Hubbard	Full shot, with some edge cooling mid pulse. Density still too low at grill, esp during ICRF. Next: try to center plasma vertically on grill.
Sep 6 2012 11:21:23:090AM	1120906010	Amanda Hubbard	THis was a hotter, steadier, I-mode discharge; the centering of the plasma may have improved some PFC interaction. 130 kJ, Te0 6 keV, Te8 1.1 keV (cools after 1.05 s when Prad rises, 1 MW until then. But, LH still not coupling, even in the ohmic period.
Sep 6 2012 11:33:00:263AM	1120906011	Amanda Hubbard	Good shot, but no LH at all. Extended J longer, reverted to L-mode in that period.
Sep 6 2012 11:39:50:443AM	1120906011	Amanda Hubbard	Good shot, but no LH at all. Extended J longer, reverted to L-mode in that period. LH crew reports local density is lower when E on.
Sep 6 2012 11:53:19:243AM	1120906012	Amanda Hubbard	First shot where some LH is coupled - trip levels were raised. Reflections are still very high (70% to 40%). NINJA puff (<~ 1 sec) did help, but also raised target density, from nebar 1.2 (higher than a few shots ago) to 1.5. They will back off. Next shot: Reduce Ip to 1 MA, see if it affects SOL lengths. Better keep a close eye on limiter....
Sep 6 2012 12:14:23:283PM	1120906013	Amanda Hubbard	Good. 1 MA. Nebar 1.1-1.3. Coupled 200-400 kW LH. From ECE, looks like more effect in the ohmic period, not what is expected. But ne is a little lower. Note: At today's field, should use GPC2 channels 7 or lower, eg Ch 6, for non-thermals, not Ch 10.
Sep 6 2012 12:17:09:930PM	1120906014	Amanda Hubbard	Used 2.6 MW J+ 0.5 E. This gave good hot plasma, and better LH (but still high reflections). Definitely some non-thermals on ECE. nebar 1.2-1.5e20. Next: Try just J-port. Don't think this will be an I-mode but you never know.
Sep 6 2012 12:37:16:023PM	1120906015	Amanda Hubbard	2.5 MW, J-port only. We did get an I-mode, but as expected, rather marginal and late, ~ sec. This would make seeing small changes due to LHCD hard. Greg reports coupling not all that much better. So we will go back to the waveforms of shot 14, start modifying the timing of ICRF and LH to see the effects more clearly. And hopefully raise the LH power.
Sep 6 2012 12:52:33:670PM	1120906016	Amanda Hubbard	3 MW ICRF. I-mode still comes rather late, about 940 ms, which reduces Prad and ne. Did get about 3 keV non-thermal ECE.
Sep 6 2012 01:20:31:270PM	1120906017	Amanda Hubbard	Good shot for the MP. Steady hot plasma, with LH ~ 400 kW, N//=1.3-1.5. Small effect on ECE. Should have HXR data.
Sep 6 2012 01:47:04:677PM	1120906018	Amanda Hubbard	Another very good shot, steady hot plasma, with ~ 500 kW LH mid I-mode, SHoudl be good data at turnoff. But, nebar by then is 1.5e20, more than we had wanted (shot 17 also). So, repeat with lower target ne. As I feared, Ian reports little HXR response on this shot and 17, more on 16 and 19.
Sep 6 2012 01:41:38:467PM	1120906019	Amanda Hubbard	Lower target density gave a lower density in flat top (1.1e20 m-3), but unfortunately a much less steady shot. I mode didn't come until about 0.9 s, perhaps triggered by NINJA puff?? Did get more ECE, but will be hard to sort out transients. By LH turnoff, ne is up to 1.3e20, and ECE effect is small. Try going back to higher target, turning off NINJA puff. Can LH couple without it?
Sep 6 2012 02:06:52:050PM	1120906020	Amanda Hubbard	Turning off the NINJA gave no LH power; not a good thing. Also resulted in another very late I-mode (after 1 sec). Did give lower density, nebar 1.3 to 1e20. Next, turn NINJA puff back on, earlier (0.8 s).
Sep 6 2012 02:17:21:003PM	1120906021	Amanda Hubbard	Low density discharge, but again not very steady - Confinement transition not until after 1 second. Density drops throughout pulse. LH issue prevents any power. Raise target density to nel 6.5ee19 and repeat.
Sep 6 2012 02:29:29:880PM	1120906022	Amanda Hubbard	Got good LH this time, but many trips in ICRF (J-port). Result was a moderately hot L-mode. Some ECE response to the LH. nebar 1.2 to 1.5 to 1.3e20; NINJA puff is having quite a big effect I think. Rebalance J and E. And hope LH still couples.
Sep 6 2012 02:51:17:753PM	1120906023	Amanda Hubbard	Good ICRF and LH. Te0 5 keV, Te8 below 1 keV, not an I-mode except perhaps at very end of ICRF pulse (after LH). nebar ~ 1.5e20 during LH. Should have good data on the LH effect at turnoff (I think it was small, though). Next: Try some N// variation.
Sep 6 2012 03:07:50:957PM	1120906024	Amanda Hubbard	Good ICRF and LH. N//=1.9 This time got a short, late, I-mode 1.04-1.16 s, complicating interpretation of HXR I expect. Do see ECE turnoff, ~1 keV. nebar 1.5 - 1.4 during LH. Next: Repeat trying more E-port power. See if coupling can handle it.
Sep 6 2012 03:34:51:453PM	1120906025	Amanda Hubbard	Good ICRF and LH. N//=1.9 Higher ICRF power. 3.7 MW. Again got a short, late, I-mode 1.04-1.16 s, complicating interpretation of HXR I expect. Do see ECE turnoff, ~1 keV. A second I-mode after 1.2 s. Next higher N//. And Cornwall will delay his NINJA puff from 0.8 to 0.9 secs (moving it earlier is one of the few changes we've made since the better shots 17 and 18).
Sep 6 2012 03:59:34:350PM	1120906026	Amanda Hubbard	Got the early I-mode back, steady until after LH. Looks like the earlier NINJA puff was the problem (mea culpa, I asked for the change). Good ICRF. N//=2.5 High reflected power, so low (350 - 200 kW) forward power. But enough I hope to see any LH effects. I do see some ECE rise, which is higher than at lower N//. Next, we will turn off ICRF, program ne ramps during LHCD, to get a low Te comparison for the analysis and modeling.
Sep 6 2012 04:02:10:953PM	1120906027	Amanda Hubbard	Comparison shot, with ne ramp and LHCD N// 1.9. nebar is 1.2 -1.35e20 during ICRF, which is 660 kW. Got more ECE response than we've had all day - so much for the 'high Te is good' theory. Though ne and power may not be quite comparable. next, repeat at N//=2.2, increase ne ramp.
Sep 6 2012 04:35:52:880PM	1120906028	Amanda Hubbard	Another good comparison shot, with ne ramp and LHCD N// 2.2. nebar is 1.2 -1.6e20 during ICRF, which is 600 kW. Good, covered the range of most of today's ICRF shots, for comparison of HXR, PDI etc. Next, try for a 900 kA I-mode.
Sep 6 2012 04:49:42:413PM	1120906029	Amanda Hubbard	900 kA, with 3 MW ICRF. Got a hot L-mode, no sign of limiter heating. LH tripped early. nebar ~ 1.3e20m-3. Repeat with - slightly lower target ne. - 0.5 MW more ICRF, and power to 1.4 s for better baseline. - LH staying on. (too late in the day for one thing at a time...)
Sep 6 2012 05:05:03:140PM	1120906030	Amanda Hubbard	Very similar, both the plasma and (unfortunately) the LH; only a short pulse. Got an I-mode this time, but after LHCD. 6 keV! I aw ~ 700 eV non-thermal response, Ian reports no HXR. But a short and low power LH pulse. Thanks everyone! We proved LH and ICRF CAN play together, with a little nudging.

Physics Operator Comments
Sep 6 2012 09:30:08:700AM	1120906002	Yijun Lin	shot 1: loaded segment 2 from 1120829017, segment 1 from 1120905002, Neon disabled. no cryopump ICRF 0.7-1.1 sec LH 0.8-1.3 sec Load at 6-Sep-2012 08:53:57.00 Open tree /home/ylin/pcs_scratch -1 Open tree done result: disrupted at 0.68. no RF. next: raise nl04 to 0.5e20, and enable neon (150 ms)
Sep 6 2012 09:35:58:567AM	1120906003	Yijun Lin	added neon 150 ms (PG1), raise nl04 to 0.5e20. Load at 6-Sep-2012 09:09:18.00 Open tree /home/ylin/pcs_scratch -1 Open tree done result: I-mode. disrupted at 1.09 sec. possibly heating something. next shot: raise density to 0.6 Load at 6-Sep-2012 09:35:02.00 Open tree /home/ylin/pcs_scratch -1 Open tree done
Sep 6 2012 09:47:58:487AM	1120906004	Yijun Lin	raise density to 0.6e20. result: full plasma. Hot I-mode (Te0 ~ 7.7 keV) next shot: lower field to 5.2 T (TF 145.7 kA). no other change. Load at 6-Sep-2012 09:47:06.00 Open tree /home/ylin/pcs_scratch -1 Open tree done
Sep 6 2012 10:08:41:877AM	1120906005	Yijun Lin	lower field to 5.2 T. result: full plasma. next shot: Neon 200 ms (60%). Reduce outer gap by 7 mm to 10 mm. (for LH coupling) Load at 6-Sep-2012 10:05:51.00 Open tree /home/ylin/pcs_scratch -1 Open tree done
Sep 6 2012 10:28:02:853AM	1120906006	Yijun Lin	Programed outer gap to 10 mm, got 10 mm. result: full plasma. got a little LH. next shot: Add a little strike point sweep 0.9-1.1 sec...(only touched ZXL) reduce outergap to 5 mm. Load at 6-Sep-2012 10:27:22.00 Open tree /home/ylin/pcs_scratch -1 Open tree done
Sep 6 2012 10:41:42:500AM	1120906007	Yijun Lin	Programed outer gap to 5 mm, got 7 mm. no more hot spot in divertor (the strike point sweep might have helped) result: full plasma. got a little LH. next shot: add NINJA puff from C-Port. (Controlled by M. Churchill and C. Lau)
Sep 6 2012 10:42:13:963AM	1120906007	Yijun Lin	Programed outer gap to 5 mm, got 7 mm. no more hot spot in divertor (the strike point sweep might have helped) result: full plasma. got a little LH. next shot: add NINJA puff from C-Port. (Controlled by M. Churchill and C. Lau) Load at 6-Sep-2012 10:42:05.00 Open tree /home/ylin/pcs_scratch -1 Open tree done
Sep 6 2012 10:51:35:593AM	1120906008	Yijun Lin	with NINJA puff. result: disrupted at 0.53 sec. impurity injection... next: repeat. no PCS change.
Sep 6 2012 11:10:16:077AM	1120906009	Yijun Lin	with NINJA puff. result: full length. LH was still struggling. next: move Zcur down by 7 mm.. Load at 6-Sep-2012 11:10:09.00 Open tree /home/ylin/pcs_scratch -1 Open tree done
Sep 6 2012 11:24:05:833AM	1120906010	Yijun Lin	result: full length. LH was still struggling (even in ohmic part) next: Lengthen Ar puff to 125 ms per Matt Reinke's remote request. also some NINJA change. Load at 6-Sep-2012 11:22:52.00 Open tree /home/ylin/pcs_scratch -1 Open tree done
Sep 6 2012 11:32:15:687AM	1120906011	Yijun Lin	result: full length. LH was to dummyload (LH-OP error) next: no PCS change.
Sep 6 2012 11:50:39:833AM	1120906012	Yijun Lin	result: full length. LH power good (after adjusting trip level) next: lower Ip to 1 MA. lower NINJA pressure. no other changes. Load at 6-Sep-2012 11:50:26.00 Open tree /home/ylin/pcs_scratch -1 Open tree done
Sep 6 2012 12:05:36:717PM	1120906013	Yijun Lin	result: full length. 1 MA. next: no pcs change. (change ICRF. lower E, higher J)
Sep 6 2012 12:15:36:593PM	1120906014	Yijun Lin	result: full length. LH had power in. next: no pcs change. (change ICRF. J only).
Sep 6 2012 12:32:51:550PM	1120906015	Yijun Lin	result: full length. next: reduce outer gap by 2 mm. Load at 6-Sep-2012 12:29:40.00 Open tree /home/ylin/pcs_scratch -1 Open tree done
Sep 6 2012 12:51:11:380PM	1120906016	Yijun Lin	result: full length. next: Neon puff 250 ms (60%) Load at 6-Sep-2012 12:51:02.00 Open tree /home/ylin/pcs_scratch -1 Open tree done
Sep 6 2012 01:05:27:580PM	1120906017	Yijun Lin	result: plasma full length. (250 ms Neon) next: no pcs change.
Sep 6 2012 01:15:49:650PM	1120906018	Yijun Lin	result: plasma full length. next: lower target nl04 to 0.5e20 from 0.6e20. Load at 6-Sep-2012 13:15:31.00 Open tree /home/ylin/pcs_scratch -1 Open tree done
Sep 6 2012 01:39:22:690PM	1120906019	Yijun Lin	result: plasma full length. next: raise target density back to 0.6, turn off NINJA Load at 6-Sep-2012 13:39:09.00 Open tree /home/ylin/pcs_scratch -1 Open tree done
Sep 6 2012 02:00:02:420PM	1120906020	Yijun Lin	result: plasma, disrupted 1.4 sec. LH faulted out. next: add back NINJA puff. no pcs change.
Sep 6 2012 02:16:38:640PM	1120906021	Yijun Lin	result: plasma, full length. LH faulted out. next: raise nl04 to 0.65e20 Load at 6-Sep-2012 14:16:30.00 Open tree /home/ylin/pcs_scratch -1 Open tree done
Sep 6 2012 02:32:59:003PM	1120906022	Yijun Lin	result: plasma, full length. raised density, got LH, but many ICRF faults next: no pcs change.
Sep 6 2012 02:48:05:020PM	1120906023	Yijun Lin	result: plasma, full length. good LH, good ICRF, but I-mode? next: no pcs change. vary LH N//
Sep 6 2012 03:03:36:397PM	1120906024	Yijun Lin	result: plasma, full length. good LH, good ICRF next: no pcs change. (raise ICRF power)
Sep 6 2012 03:35:25:610PM	1120906025	Yijun Lin	result: plasma, full length. good LH, good ICRF, but I-mode? next: no pcs change. move NINJA later. seems there is a N2 leak..
Sep 6 2012 03:50:25:817PM	1120906026	Yijun Lin	result: plasma, full length. got LH and ICRF. and I-mode is back. next: density ramp during LH...(nl04 0.6-0.8 at 1.1 sec) Load at 6-Sep-2012 15:50:20.00 Open tree /home/ylin/pcs_scratch -1 Open tree done
Sep 6 2012 03:59:35:493PM	1120906027	Yijun Lin	result: plasma, full length. got LH and ICRF. with nl04 ramp.. next: no pcs change. raise target density to 0.9e20 at the end of rampup.
Sep 6 2012 04:08:08:523PM	1120906027	Yijun Lin	result: plasma, full length. got LH and ICRF. with nl04 ramp.. next: no pcs change. raise target density to 1.0e20 at the end of rampup. Load at 6-Sep-2012 16:01:15.00 Open tree /home/ylin/pcs_scratch -1 Open tree done Seems to be another N2 leak.
Sep 6 2012 04:25:12:793PM	1120906028	Yijun Lin	result: plasma full length next: reload shot 26, reduce Ip to 900 kA. Load at 6-Sep-2012 16:25:07.00 Open tree /home/ylin/pcs_scratch -1 Open tree done
Sep 6 2012 04:43:41:697PM	1120906029	Yijun Lin	result: plasma full length. LH faulted out next: lower target nl04 0.5e20. no other changes.
Sep 6 2012 04:57:23:173PM	1120906030	Yijun Lin	result: plasma full length end of run.

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	07:28:32:720AM	Test	Ok	cycle test OK, but no Pat
2	09:01:18:633AM	Plasma	Ok
3	09:24:14:610AM	Plasma	Ok
4	09:36:56:220AM	Plasma	Ok
5	09:55:20:420AM	Plasma	Ok
6	10:14:00:093AM	Plasma	Ok
7	10:28:18:030AM	Plasma	Ok
8	10:42:59:013AM	Plasma	Ok
9	10:56:15:030AM	Plasma	Ok
10	11:10:58:177AM	Plasma	Ok
11	11:26:55:890AM	Plasma	Ok
12	11:39:58:593AM	Plasma	Ok
13	11:53:45:880AM	Plasma	Ok
14	12:06:28:430PM	Plasma	Ok
15	12:20:43:177PM	Plasma	Ok
16	12:38:28:620PM	Plasma	Ok
17	12:52:13:307PM	Plasma	Ok
18	01:07:33:427PM	Plasma	Ok
19	01:25:20:927PM	Plasma	Ok
20	01:50:33:260PM	Plasma	Ok
21	02:04:46:387PM	Plasma	Ok
22	02:19:57:533PM	Plasma	Ok
23	02:34:32:843PM	Plasma	Ok
24	02:55:56:213PM	Plasma	Ok
25	03:11:01:950PM	Plasma	Ok
26	03:38:57:243PM	Plasma	Ok
27	03:52:27:473PM	Plasma	Ok
28	04:15:19:170PM	Plasma	Ok
29	04:35:14:653PM	Plasma	Ok
30	04:55:23:717PM	Plasma	Ok