Alcator C-Mod Run 1120907 Information

Miniproposals

Miniproposal: 712

Date Filed: 7/2/2012

Title: Density range and denpendences of I-mode in Rev Bt LSN plasmas

First Author: Amanda Hubbard

Session Leader: Amanda Hubbard (shots 1-37)

Operators
Session leader(s):	Amanda Hubbard
Physics operator(s):	Ian Hutchinson
Engineering operator(s):	Roza Tesfaye,Gary Dekow,Bill Parkin,Thomas Toland

Engineering Operator Run Comment
Density range and dependence of I-mode in Rev Bt LSN plasmas; SL:Hubbard

Session Leader Plans

Entered: Sep 7 2012 07:49:09:973AM

Author: Amanda Hubbard

Run Plan for 1120907

MP 712 "Density range and dependence of I-mode in Rev Bt LSN plasmas"

Session Leader: Amanda Hubbard
Physics Operator: Ian Hutchinson

This run will continue the run from 1120829, which made good progress but was limited in power (to about 3.7 MW) due to lack of E-port ICRF.

Before run, do short boronization followed by Helium ECDC.
See OPS bulletin by Gary Dekow for details.
Cryopump is desired. Gas setup as on 1120829. We will need Ne seeding; start with 150 ms.

Step 0: Boronization recovery. Recover density control and ICRF power (all 2 antennas). If this takes too long, consider a deliberate VDE shot or two.
4-5 shots?

We may decide to do step 2 before step 1 if the target density hard to reduce.

1. Complete high power part of Part A, scan to low densities.

Start with repeat of 1120829015, a nice I-mode with moderately low density. But, increase ICRF power to max available. Will we get an I-H transition?

Scan density shot to shot, starting with lower densities. Shorten pulse and use Neon as needed to avoid overheating Mo. Either reach I-H transitions or, more likely, establish lower bound.

2. MP Part B: Scan target density to higher values, document L-I and I-H thresholds.

Start with nebar 1.5e20 m-3 (as on 1120829012). Step ICRF power, determine L-I and I-H tresholds.

Then increase density shot to shot. Based on prior experience we expect the power window to get rather narrow at higher densities. Determine max ne at which we get a clear I-mode, as opposed to direct L-H transition.

3. Part C: Fuel density DURING a hot I-mode.

Return to one of the moderate density I-modes from Part 1 (nebar ~ 1.2-1.3), with high ICRF. Program density to rise, and/or puff with NINJAs, AFTER I-mode is established. Goal is to see if we can increase I-mode density above the usual upper limit found eg in Part 2. This is likely to take a number of discharges to optimize.

4. Part D; Ip scan, performance optimization.

Time permitting, which is as usual unlikely, we will take some of the most interesting cases from the earlier shots, and vary current. Up to 1.3 MA for maximum performance. And down as low as 0.9 MA to establish a hot target for future LHCD scenarios.

Physics Operators Plans

Session Leader Summaries

Entered: Sep 10 2012 12:37:28:560PM

Author: Amanda Hubbard

Run summary for 1120907

MP 712 "Density range and dependence of I-mode in Rev Bt LSN plasmas"

Session Leader: Amanda Hubbard
Physics Operator: Ian Hutchinson

This run continued the run from 1120829, which made good progress but was limited in power (to about 3.7 MW) due to lack of E-port ICRF. Today we had full ICRF power (4.7 MW routinely clean, up to 5 MW on some shots), which proved needed and valuable in expanding the C-Mod operation space. MANY THANKS TO ANDY AND THE REST OF THE RF CREW WHO WORKED OVER (AND OVER)TIME IN THE PAST WEEK TO GET ALL THE TRANSMITTERS WORKING.

We used a short boronization followed by overnight He ECDC, as before 1120829, so conditions were good and comparable. Little trouble with Mo radiation. Boronization recovery (outgassing, RF tripping) took about 6 shots. On shot 4 we induced a deliberate VDE, which was helpful - future run leaders might want to consider this.

Given densities were high, started with MP Part B, determining L-I and I-H thresholds at moderately high densities. (Shots 9-15). Got good points between nebar 1.3-1.8 e20 m-3. At the higher densities, the window between I and H-mode transitions was extremely narrow; no steady I-modes, at most a brief transient phase before the H-mode transition. eg shots 12-15, nebar 1.55-1.8.

We then went to lower densities (Part A), which had been covered on 1120829, with the goal of injecting higher ICRF. Density programming proved tricky; shot 16 evolved to higher density during I-mode. Reducing target density on shot 17 led to a locked mode and disruption, the start of a series of locked modes and fizzles; by this point the walls were completely outgassed and we were actually getting lower densities than programmed. (shots 17-23).

Recovered good, full length discharge with I-mode on shot 24 (nebar 10^20, I-modes a 2, 3 ~4 MW, no H-mode.

Shots 25-28 were very good I-mode discharges, nebar ~ 1.3-1.5. Progressively better ICRF. Shot 28 is a particularly nice, high performance discharge (tweaking Zcur and gaps ameliorated the ipurity influx at highest P on shot 26, a good equilibrium for future use). This had nearly 5 MW ICRF, > 1 keV pedestals (with great ETS data), Te0 7.5 keV (on GPC, GPC2 was saturating!), WMHD 178 kJ and H98 =1.1.

From shots 29-32 we did Part C, fueling DURING an I-mode. This is something we've wanted to try for a long time, and worked better than I had dared expect. We used NINJA puffing, mainly HFS. Extended I-mode density to 1.7 e20 on shot 29, 1.8e20 on shot 31, and 2e20 m-3 on shot 32 (another 'trophy'). The pedestal cooled, and we could see changing fluctuaions, but still solidly an I-mode and WMHD stayed nearly as high. Note that this density is above that for which we could make a steady I-mode starting with a cold target. It thus appears that the trajectory matters; creating a hot pedestal and strong WCM first enables avoiding H-mode to higher densities.

The run was going well enough it was decided to extend an hour - many thanks to those who stayed on no notice!

Shots 33 and 34 were locked mode shots for HIREX. Shot 35 we used even stronger NINJA fueling; got some RF trips, and eventually an I-H transitions at nebar ~ 2e20 m-3. It tentatively appears that lower Te correlated with I-H modes. Clearly there is room to expand further, and the prospect that with more power even higher densities and pressures could be optained.

Shots 36 and 37 we went on to 1.3 MA. (Part D) Again got very high performance I-modes. The early part of 36 reached over 200 kJ with 4.7 MW ICRF! Again H98 > 1.1. NINJA puffing degraded things somewhat, partly due to causing RF trips. But, we again remained in I-mode to 2e20 m-3, with a late I-H transition when Tped was relatively cool. Shot 37 had delayed fuelling and lower density, but lower ICRF power and performance.

We have much data to analyse, for IAEA and likely a long time beyond. An expanded operating space for I-mode and tantalizing prospects for the regime in the future, on C-Mod and elsewhere. If this was my last run, I'm glad it was a good one! Many thanks to the large team (engineering, RF, many diagnostics) who made it happen.

Session Leader Comments

Sep 7 2012 09:10:15:210AM 1120907001 Amanda Hubbard First shot ran well. As expected post-boronization, lots of gas - nel 8e19 m-2 pre-RF, 1.3e20 after. E had only a few trips, D ran clean, J was tripping.

5.8 T, 1.1 MA; we plan to stay at this field all day, and current most of the day.
Try again.

Sep 7 2012 09:16:01:133AM 1120907002 Amanda Hubbard Similar - D and E ran clean, J is tripping early. We will use cryopump next shot to try and reduce neutral pressure.

Sep 7 2012 09:38:27:633AM 1120907003 Amanda Hubbard Similar again - D and E ran clean, J is tripping early in high P phase.

Cryopump did reduce densities, by about 0.1 nel (now 1 to 1.2e20, still well above our target of 0.6).

Next shot we will try to induce a disruption at 1.2 secs.

Sep 7 2012 09:52:22:930AM 1120907004 Amanda Hubbard 900 kA conditioning shot. Density and RF were somewhat better (nel 0.7 to 1.2 e20 m-2), up to 4 MW though J is still ratty.

VDE induced 1.23 secs (went down). We'll see if this reduces density and gas on the next shot.

Sep 7 2012 10:09:00:237AM 1120907005 Amanda Hubbard Conditioning shot (maybe next to last one?). Getting better - we actually got a short I-mode followed by an ELM-free H-mode duirng the higher power ICRF phase. Max nel 10^20 m-3 before H-mode. The disruption appears to help.

One more cleanup shot coming up.

Sep 7 2012 10:17:17:687AM 1120907006 Amanda Hubbard Similar. Again a quick L to I to H-mode sequence, early in the 4 MW RF step, not in the 2 MW step. So we have some idea of the thresholds (at nel ~ 9e19,
nebar ~1.5-1.6e20.).

Next, start the physics. RF step 3 and 4 MW.

Sep 7 2012 10:34:49:337AM 1120907007 Amanda Hubbard GOod plasma. 3 MW was already enough to make an I-mode and I-H transition; thresholds are low. So, next shot use 2, 2.5 and 3 MW steps.

nel 0.7-0.9 in this period. nebar 1.1-1.5e20. More outgassing and evoultion than I'd like, hopefully the early 2 MW step will help get that out of the way.

Radiation is nice and low - only 0.5 MW in I-mode phase on 2 pi diode, which had ~ 2 MW yesterday. So boronization has helped!

Sep 7 2012 10:48:12:210AM 1120907008 Amanda Hubbard Good. I-mode starts developing I think already in 2 MW step, certainly in 2.5 MW. nebar evolving 1.0-1.3 e20. Then I-H at 0.87 s, 2.6 MW, nebar 1.4e20.

Next shot we (Yijun) will reduce power further, and make longer steps since it is taking some time for density and I-mode to evolve.
Power window is indeed rather narrow in this density range.

Sep 7 2012 11:05:48:553AM 1120907009 Amanda Hubbard Perfect threshold shot, at fairly constant density nebar 1.2-1.3e20 m-3 (nel 0.75e19 m-2).

Got gradual L-I evolution at 0.85 s (only 2 MW ICRF), very clear and hot at 2.6 MW. H98 ~ 1. And I-H transition late in 2.6 MW step, so this must be about the threshold.

Next: Repeat with slightly higher target ne. Decided to go up first, until we lose the I-mode phase, and then go down.

Sep 7 2012 11:24:14:460AM 1120907010 Amanda Hubbard Good shot. Got very clear L-I at 2 MW. Though density was not much higher at this time, nel 1.3e20. NO I-H transition, up to 2.6 MW, nel 1.4. So we will add more power next shot. Also extend duration and have NINJA puff at 1.2 secs.

Sep 7 2012 11:40:09:453AM 1120907011 Amanda Hubbard Good shot. Got brief I-mode then I-H transition, all in the 3 MW power step.

nel was 8.2e19, nebar 1.3 e20, not as high as I wanted. Outgassing is now pretty low.

second H-mode transition at nebar 1.7e20, and 3.4 MW ICRF. This one seems to go directly L-H.

Next increase target by nel 0.2e19, use bigger RF steps since I don't know what thresholds to expect.

Sep 7 2012 11:53:06:970AM 1120907012 Amanda Hubbard Good shot. nel was 1.0e20. nebar 1.55

Again, got brief I-mode then I-H transition, all in the 3 MW power step.

Repeat with 2.5 MW in first step to bracket L-I power.

Sep 7 2012 12:16:05:090PM 1120907013 Amanda Hubbard Good shot. nel was 1.0e20. nebar 1.6e20 (slightly higher than in 12, maybe due to more early RF?)

No apparent I-mode even at 2.5 MW, then perhaps a brief transient phase just before H-mode at 3 MW - the window is indeed narrow!

Prad staying low (0.4 MW) in L/I mode, up to > 3 MW in H-mode(s).

Next: Increase target density. I rather expect direct L-H transition, we'll see.

Sep 7 2012 12:32:02:900PM 1120907014 Amanda Hubbard Good shot. nel was again 1.1e20, nebar 1.8e20.

Definitely L-mode at 3 MW. H-mode early in 4 MW step (1.055 s), with perhaps a brief, transient, I-mode phase at RF stepup. (starting 1.025 s).

The RF step was rather big, so next shot increase middle step, reduce last step to 3.9 MW.

Sep 7 2012 12:52:17:753PM 1120907015 Amanda Hubbard Good shot. nel was again 1.1e20, nebar 1.8e20.

Even at 3.89 MW (with some trips) there is at most a weak, transient, I-mode phase prior to H-mode; slight change in fluctuations and Tedg at 0.935 s, no real increase in confinement. Prompt I(?)-H transition very early in the step to 4 MW. With simultaneous Te and ne increases.

Could go even higher in density. But, given the long run plan we will instead go down. Program target nel 5e19 m-3, use bigger RF steps until we see how wide the I-mode power window is.

Sep 7 2012 01:20:58:930PM 1120907017 Amanda Hubbard Locked mode before RF leads to disruption; ne dropping too low (3.5e19!)

Sep 7 2012 01:31:37:157PM 1120907018 Amanda Hubbard Same again only worse; nel to 2e19, followed by strong non-thermals!

Sep 7 2012 01:37:27:600PM 1120907019 Amanda Hubbard Fizzle.

Sep 7 2012 02:07:52:553PM 1120907020 Amanda Hubbard
Plasma. Got a very low density throughout; about what was programmed, but less than expected based on prior shots - no increase during ICRF this time. nebar only 6e19 m-3, less than half that on shot 16!

Decent plasma until 0.9 s when there is a locked mode and/or injection. Te0 7 keV, and H-mode like confinement, though not an evident pedestal; 60 GHz reflectometer does show decrease in fluctuations. So, either an I-mode or very hot L-mode. Certainly no H-mode. 3 MW.

But also high impurities and disruptions.

Sep 7 2012 02:21:12:323PM 1120907021 Amanda Hubbard Disrupted about 0.25 s.

Sep 7 2012 02:28:29:110PM 1120907022 Amanda Hubbard Plasma to 1.2 secs. But again very low density (nebar 7e19), and high radiation, esp in 4 MW ste. There is now no increase at all when RF is on.

High Te and confinement, though. Fluctuaions do look like I-mode. But not a pretty discharge; Zeff = 8!

We will raise target nel to 7e19,

Sep 7 2012 02:29:28:640PM 1120907023 Amanda Hubbard Fizzle

Sep 7 2012 02:54:31:150PM 1120907024 Amanda Hubbard Got a full shot back. Density ended up lower than programmed, but higher than prior shots; nel 6e19, nebar 1.0e20 m-3. H98=1. Good I-mode at 2 and 3 MW, except for big W injection that almost killed the shot. RF struggles at 4 MW, and Prad is up to 0.9 sec.

Good data points, and clearly no H-mode.

We will increase density and Neon a bit on next shot.

Sep 7 2012 03:11:09:477PM 1120907025 Amanda Hubbard Nice one. nebar 1.2-1.3. RF up to 4.1 MW, pretty clean. I-mode all the way, at least 3 and 4 MW steps. (maybe not 2 MW, ne is higher now). H98 > 1.

Disrupted after ICRF off, for unclear reasons.

Keep this target, try for even more RF, earlier.

Sep 7 2012 03:20:15:613PM 1120907026 Amanda Hubbard Another good I-mode; clean 4 MW but tripping at 5 MW; no sign of H-mode. 1.15-1.3e20.

This one had clear L-I already in 2 MW step (after I just asked Yijun to raise for next shot). nebar was 1.2 e20 at that time.

Rebalance and repeat. Should be a good one for demonstrating nice wide power window.

Sep 7 2012 03:45:54:933PM 1120907027 Amanda Hubbard This time nice clean RF, up to about 5 MW. But not so clean plasma, getting 3 big injections in the high power phase. I'd really like this example shot, so try one more time, adjusting gaps to reduce interaction.

After this we will go to step C and try to fuel the I-mode. Which is indeed hot, Te8 ~ 1 keV and T0 7.5 keV! nebar up to 1.4 e 20.

163 kJ, and H98>1, even with the injections. Ploss is exceeding 5 MW.

This time no L-I at 2.5 MW. nebar was 1.4. So another threshold data point.

Sep 7 2012 04:01:04:717PM 1120907028 Amanda Hubbard Trophy shot - IAEA here it comes.

4.7 MW ICRF, stays in I-mode, no obvious injections. Prad rises smoothly.

nebar 1.35 to 1.55e10 20 m-3, increasing during high P phase.

W 178 kJ, H98 1.1.

Now we will move high P phase a bit earlier, and try increasing density with NINJA puff.

Sep 7 2012 04:19:38:237PM 1120907029 Amanda Hubbard Good. Puffed D2 NINJA at 0.9 secs. Nebar gets to 1.7e20, still solidly in I-mode though it is cooling a bit, and I can see changes in fluctuations. 175 kJ. H98 1.13.

This density is roughly where we were finding no I-mode window, at much lower ICRF power, in earlier shots today. So the trajectory does seem to make a difference, worth pursuing.

But, we used both LFS and HFS NINJA, seems to be making D-port trip. So adjust to mostly HFS fueling.

Sep 7 2012 04:28:33:887PM 1120907030 Amanda Hubbard Fizzle.

Sep 8 2012 12:19:07:300PM 1120907031 Amanda Hubbard Great I-mode, with fuelling. RF 4.7 MW, clean. And NIJA got us to nebar 1.77e20 m-3, still clearly in I-mode with no sign of H-mode transitions. Slight pedestal cooling (1 keV to ~ 850), but only a tiny drop in WMHD (178 to 175 kJ).

Another keeper!

Sep 7 2012 05:07:13:143PM 1120907032 Amanda Hubbard Even nicer! Longer ICRF and NINJA puffs achieved nebar to to 2e20 m-2, with only a few ICRF trips (still 4.7 MW) and keeping WMHD up - to 178 kJ.

This is well higher than we've been able to make I-modes before.

Sep 7 2012 05:25:36:487PM 1120907033 Amanda Hubbard Locked mode attempt - that didn't lock.

Sep 7 2012 05:25:22:377PM 1120907034 Amanda Hubbard Locked mode shot - that locked (early).

Sep 7 2012 05:53:10:270PM 1120907035 Amanda Hubbard Change of plans - these shots have been so good we are continuing until 6pm.

Next shot will be like 32, but with a larger gas puff, to find out what the density limit to the I-mode is, and what it then transitions to (L or H-mode?).

Result: An H-mode. Very strong NINJA puff, from 0.9 secs. Cools edge. I-H transition at 1.026 secs. nebar was just over 2e20, not very different than the highest we reached in I-mode shot 31. Likely it depends somewhat on the power and density/Te nu* trajectory somewhat. We had somewhat less steady ICRF this shot.

Next: 1.3 MA

Sep 7 2012 06:13:53:303PM 1120907036 Amanda Hubbard Good I-mode, 1.3 MA. Peak WMHD 200 kJ. W and T roll over after 0.9 s, when NINJA puff hits. RF also trips, these may be related.
High WCM frequency, about 450 kHz.

Get an I-H transition late, after edge cools.

Last shot coming up: We will delay the NINJA, tune the RF.

Sep 7 2012 06:26:13:820PM 1120907037 Amanda Hubbard Another good one - worth the wait for cryopump.

Got I-mode, no H-mode. Lower density, droops without NINJA.

Some ICRF tripping, W HMD 188-155 kJ.

THAT'S ALL FOLKS - THE LONG LATE RUN IS VERY MUCH APPRECIATED! WILL BRING GOODIES ON MONDAY.

Have a good weekend - I'll post a proper summary on Monday.

Physics Operator Comments

Sep 7 2012 09:06:22:083AM Ian Hutchinson Load shot from 1120906003.

[This was constructed by YLin from
"shot 1: loaded segment 2 from 1120829017, segment 1 from 1120905002"]

Set nl04 to 0.6e20
Bt is 5.8T TF current 162500A.

Move clearin rampup 25ms earlier because this shot doesn't divert quickly enough.

Load.

Sep 7 2012 09:12:18:103AM 1120907001 Ian Hutchinson Plasma to rampdown. Substantial gas from the RF.

Move clearin ramp another 20ms earlier. Load.

Sep 7 2012 09:30:57:847AM 1120907002 Ian Hutchinson Plasma to rampdown.

Move to cryopump.
Fill puff to 42ms ending at -0.4s. Load.

Sep 7 2012 09:42:50:460AM 1120907003 Ian Hutchinson Plasma.

Plan a VDE with an attempt at downward motion.
Install a zcur downward ramp from 1.2s to -4cm at 1.3s.
Turn off fast zcur at 1.22s.
Ip to 0.9MA.

Sep 7 2012 10:00:32:230AM 1120907004 Ian Hutchinson Plasma. VDE at about 1.2s went down.

Load from shot 3. Load.

Sep 7 2012 10:10:47:090AM 1120907005 Ian Hutchinson Plasma. H-mode triggered by 4MW. Ratiomatic neutral pressure now below 0.2.

Sep 7 2012 10:23:54:597AM 1120907006 Ian Hutchinson Plasma. 2 H-modes.

Sep 7 2012 10:38:19:417AM 1120907007 Ian Hutchinson Plasma. 2 H-modes.

Sep 7 2012 10:48:15:210AM 1120907008 Ian Hutchinson Plasma. 1 H-mode.

Sep 7 2012 11:23:13:380AM 1120907009 Ian Hutchinson Plasma. Good I-mode signatures followed by I-H transition.

nl04 to .7e20 Load.

Sep 7 2012 11:32:28:850AM 1120907010 Ian Hutchinson Plasma. No I-H transition.

Sep 7 2012 11:46:59:043AM 1120907011 Ian Hutchinson Plasma. Two H-modes. Impurity injection at crossover.

nl04 to 0.9e20. Load.

Sep 7 2012 12:09:50:083PM 1120907012 Ian Hutchinson Plasma. Two H-modes.

Sep 7 2012 12:22:24:180PM 1120907013 Ian Hutchinson Plasma. Two H-modes

nl04 to 1.1e20. Load.

Sep 7 2012 12:45:46:253PM 1120907014 Ian Hutchinson Plasma. Transitions to H-mode quite quickly at 4MW, perhaps passing through an I-mode phase.

Sep 7 2012 12:55:45:660PM 1120907015 Ian Hutchinson Plasma. H-mode.

nl04 to 0.5e20. Load.

Sep 7 2012 01:08:25:930PM 1120907016 Ian Hutchinson Plasma. I followed by 3 H-modes.

nl04 to .4e20. Load.

Sep 7 2012 01:22:39:450PM 1120907017 Ian Hutchinson Plasma disrupts at 0.7s. Appears to be a locked mode starting between .55 and .6s.

Raise nl04 to .5 at .3s

Sep 7 2012 01:49:14:627PM 1120907018 Ian Hutchinson Plasma disrupts at 0.7s. Pretty similar.

Raise nl04 early substantially more. Load.

Sep 7 2012 01:49:23:267PM 1120907019 Ian Hutchinson Fizzle.

Sep 7 2012 02:02:46:597PM 1120907020 Ian Hutchinson Plasma disrupts at 1.05s.

Raise nl04 to 0.5 throughout.
Enable B-side-lower 150ms Ne puff at 2psi, level 60.
Load.

Sep 7 2012 02:16:46:023PM 1120907021 Ian Hutchinson Plasma disrupts at 0.26s. Very ugly and dirty.

Raise early nl04

Sep 7 2012 02:29:53:263PM 1120907022 Ian Hutchinson Plasma disrupts at 1.2s.

nl04 to .7e20. Load.

Sep 7 2012 02:43:19:007PM 1120907023 Ian Hutchinson Fizzle.

ICEF4 to 1320 from 1290A.

Sep 7 2012 02:56:02:300PM 1120907024 Ian Hutchinson Plasma to rampdown.

nl04 to 0.8e20. Load.
PG1 Neon puff to 200ms duration. Load.

Sep 7 2012 03:10:48:203PM 1120907025 Ian Hutchinson Plasma disrupts at 1.2s.

Sep 7 2012 03:31:30:220PM 1120907026 Ian Hutchinson Plasma to rampdown.

Sep 7 2012 03:47:30:390PM 1120907027 Ian Hutchinson Plasma to rampdown. Some serious radiation losses at high RF.

Set zcur to -.01 to moderate upper outer limiter interaction.
Set rcur to .656 (was .657) ditto. Load.

Sep 7 2012 04:00:13:633PM 1120907028 Ian Hutchinson Plasma to rampdown. Trophy I-mode shot.

Rcur in 1 mm to .655.

Sep 7 2012 04:27:30:347PM 1120907029 Ian Hutchinson Plasma. Good I-mode.

Sep 7 2012 04:53:17:687PM 1120907030 Ian Hutchinson Fizzle. Cryopump burped.

Sep 7 2012 04:53:28:000PM 1120907031 Ian Hutchinson Plasma. Good I-mode.

Sep 7 2012 05:08:06:747PM 1120907032 Ian Hutchinson Plasma. Good I-mode trophy.

Try to get locked mode shot.
Load seg 4 from seg 4 of 1120830005.
Disable B-side lower. No ICRF. Load.

Sep 7 2012 05:21:03:910PM 1120907033 Ian Hutchinson Plasma to rampdown.

Did not appear to lock.
Adjust nl04 to get rid of third puff.

Sep 7 2012 05:48:57:117PM 1120907034 Ian Hutchinson Plasma. Disrupts at 0.77s. Locked mode as required.

Switch back to segment 2 as in shot 33. Load.

Sep 7 2012 05:55:48:287PM 1120907035 Ian Hutchinson Plasma. I to H mode

Ip to 1.3MA at 0.6s
nl04 to .9e20
Load.

Sep 7 2012 06:20:09:063PM 1120907036 Ian Hutchinson Plasma to rampdown. I to H mode.

Sep 7 2012 06:20:21:667PM 1120907037 Ian Hutchinson Plasma to rampdown.

Engineering Operator Comments

Shot Time Type Status Comment

1 08:57:40:477AM Plasma Ok

2 09:10:55:853AM Plasma Ok

3 09:25:35:037AM Plasma Ok

4 09:39:57:620AM Plasma Ok

5 09:53:18:510AM Plasma Ok

6 10:07:44:417AM Plasma Ok

7 10:21:03:403AM Plasma Ok

8 10:36:20:527AM Plasma Ok

9 10:51:41:100AM Plasma Ok

10 11:12:36:203AM Plasma Ok

11 11:27:20:823AM Plasma Ok

12 11:44:07:277AM Plasma Ok

13 12:03:45:443PM Plasma Ok

14 12:17:23:947PM Plasma Ok

15 12:36:00:580PM Plasma Ok

16 12:51:16:227PM Plasma Ok

17 01:05:56:463PM Plasma Ok

18 01:20:38:243PM Plasma Ok

19 01:34:21:797PM Plasma Ok

20 01:46:57:060PM Plasma Ok

21 02:00:24:593PM Plasma Ok

22 02:14:22:847PM Plasma Ok

23 02:27:07:303PM Plasma Ok

24 02:40:07:583PM Plasma Ok

25 02:53:51:023PM Plasma Ok

26 03:07:43:050PM Plasma Ok

27 03:22:38:163PM Plasma Ok

28 03:44:27:427PM Plasma Ok

29 03:57:46:353PM Plasma Ok

30 04:24:20:040PM Plasma Ok

31 04:36:47:080PM Plasma Ok

32 04:50:04:183PM Plasma Ok

33 05:04:55:713PM Plasma Ok

34 05:19:09:340PM Plasma Ok

35 05:40:04:307PM Plasma Ok

36 05:52:48:737PM Plasma Ok

37 06:17:14:463PM Plasma Ok

System Availability

Sep 7 2012 08:57:21:443AM

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 7 2012 09:10:15:210AM	1120907001	Amanda Hubbard	First shot ran well. As expected post-boronization, lots of gas - nel 8e19 m-2 pre-RF, 1.3e20 after. E had only a few trips, D ran clean, J was tripping. 5.8 T, 1.1 MA; we plan to stay at this field all day, and current most of the day. Try again.
Sep 7 2012 09:16:01:133AM	1120907002	Amanda Hubbard	Similar - D and E ran clean, J is tripping early. We will use cryopump next shot to try and reduce neutral pressure.
Sep 7 2012 09:38:27:633AM	1120907003	Amanda Hubbard	Similar again - D and E ran clean, J is tripping early in high P phase. Cryopump did reduce densities, by about 0.1 nel (now 1 to 1.2e20, still well above our target of 0.6). Next shot we will try to induce a disruption at 1.2 secs.
Sep 7 2012 09:52:22:930AM	1120907004	Amanda Hubbard	900 kA conditioning shot. Density and RF were somewhat better (nel 0.7 to 1.2 e20 m-2), up to 4 MW though J is still ratty. VDE induced 1.23 secs (went down). We'll see if this reduces density and gas on the next shot.
Sep 7 2012 10:09:00:237AM	1120907005	Amanda Hubbard	Conditioning shot (maybe next to last one?). Getting better - we actually got a short I-mode followed by an ELM-free H-mode duirng the higher power ICRF phase. Max nel 10^20 m-3 before H-mode. The disruption appears to help. One more cleanup shot coming up.
Sep 7 2012 10:17:17:687AM	1120907006	Amanda Hubbard	Similar. Again a quick L to I to H-mode sequence, early in the 4 MW RF step, not in the 2 MW step. So we have some idea of the thresholds (at nel ~ 9e19, nebar ~1.5-1.6e20.). Next, start the physics. RF step 3 and 4 MW.
Sep 7 2012 10:34:49:337AM	1120907007	Amanda Hubbard	GOod plasma. 3 MW was already enough to make an I-mode and I-H transition; thresholds are low. So, next shot use 2, 2.5 and 3 MW steps. nel 0.7-0.9 in this period. nebar 1.1-1.5e20. More outgassing and evoultion than I'd like, hopefully the early 2 MW step will help get that out of the way. Radiation is nice and low - only 0.5 MW in I-mode phase on 2 pi diode, which had ~ 2 MW yesterday. So boronization has helped!
Sep 7 2012 10:48:12:210AM	1120907008	Amanda Hubbard	Good. I-mode starts developing I think already in 2 MW step, certainly in 2.5 MW. nebar evolving 1.0-1.3 e20. Then I-H at 0.87 s, 2.6 MW, nebar 1.4e20. Next shot we (Yijun) will reduce power further, and make longer steps since it is taking some time for density and I-mode to evolve. Power window is indeed rather narrow in this density range.
Sep 7 2012 11:05:48:553AM	1120907009	Amanda Hubbard	Perfect threshold shot, at fairly constant density nebar 1.2-1.3e20 m-3 (nel 0.75e19 m-2). Got gradual L-I evolution at 0.85 s (only 2 MW ICRF), very clear and hot at 2.6 MW. H98 ~ 1. And I-H transition late in 2.6 MW step, so this must be about the threshold. Next: Repeat with slightly higher target ne. Decided to go up first, until we lose the I-mode phase, and then go down.
Sep 7 2012 11:24:14:460AM	1120907010	Amanda Hubbard	Good shot. Got very clear L-I at 2 MW. Though density was not much higher at this time, nel 1.3e20. NO I-H transition, up to 2.6 MW, nel 1.4. So we will add more power next shot. Also extend duration and have NINJA puff at 1.2 secs.
Sep 7 2012 11:40:09:453AM	1120907011	Amanda Hubbard	Good shot. Got brief I-mode then I-H transition, all in the 3 MW power step. nel was 8.2e19, nebar 1.3 e20, not as high as I wanted. Outgassing is now pretty low. second H-mode transition at nebar 1.7e20, and 3.4 MW ICRF. This one seems to go directly L-H. Next increase target by nel 0.2e19, use bigger RF steps since I don't know what thresholds to expect.
Sep 7 2012 11:53:06:970AM	1120907012	Amanda Hubbard	Good shot. nel was 1.0e20. nebar 1.55 Again, got brief I-mode then I-H transition, all in the 3 MW power step. Repeat with 2.5 MW in first step to bracket L-I power.
Sep 7 2012 12:16:05:090PM	1120907013	Amanda Hubbard	Good shot. nel was 1.0e20. nebar 1.6e20 (slightly higher than in 12, maybe due to more early RF?) No apparent I-mode even at 2.5 MW, then perhaps a brief transient phase just before H-mode at 3 MW - the window is indeed narrow! Prad staying low (0.4 MW) in L/I mode, up to > 3 MW in H-mode(s). Next: Increase target density. I rather expect direct L-H transition, we'll see.
Sep 7 2012 12:32:02:900PM	1120907014	Amanda Hubbard	Good shot. nel was again 1.1e20, nebar 1.8e20. Definitely L-mode at 3 MW. H-mode early in 4 MW step (1.055 s), with perhaps a brief, transient, I-mode phase at RF stepup. (starting 1.025 s). The RF step was rather big, so next shot increase middle step, reduce last step to 3.9 MW.
Sep 7 2012 12:52:17:753PM	1120907015	Amanda Hubbard	Good shot. nel was again 1.1e20, nebar 1.8e20. Even at 3.89 MW (with some trips) there is at most a weak, transient, I-mode phase prior to H-mode; slight change in fluctuations and Tedg at 0.935 s, no real increase in confinement. Prompt I(?)-H transition very early in the step to 4 MW. With simultaneous Te and ne increases. Could go even higher in density. But, given the long run plan we will instead go down. Program target nel 5e19 m-3, use bigger RF steps until we see how wide the I-mode power window is.
Sep 7 2012 01:20:58:930PM	1120907017	Amanda Hubbard	Locked mode before RF leads to disruption; ne dropping too low (3.5e19!)
Sep 7 2012 01:31:37:157PM	1120907018	Amanda Hubbard	Same again only worse; nel to 2e19, followed by strong non-thermals!
Sep 7 2012 01:37:27:600PM	1120907019	Amanda Hubbard	Fizzle.
Sep 7 2012 02:07:52:553PM	1120907020	Amanda Hubbard	Plasma. Got a very low density throughout; about what was programmed, but less than expected based on prior shots - no increase during ICRF this time. nebar only 6e19 m-3, less than half that on shot 16! Decent plasma until 0.9 s when there is a locked mode and/or injection. Te0 7 keV, and H-mode like confinement, though not an evident pedestal; 60 GHz reflectometer does show decrease in fluctuations. So, either an I-mode or very hot L-mode. Certainly no H-mode. 3 MW. But also high impurities and disruptions.
Sep 7 2012 02:21:12:323PM	1120907021	Amanda Hubbard	Disrupted about 0.25 s.
Sep 7 2012 02:28:29:110PM	1120907022	Amanda Hubbard	Plasma to 1.2 secs. But again very low density (nebar 7e19), and high radiation, esp in 4 MW ste. There is now no increase at all when RF is on. High Te and confinement, though. Fluctuaions do look like I-mode. But not a pretty discharge; Zeff = 8! We will raise target nel to 7e19,
Sep 7 2012 02:29:28:640PM	1120907023	Amanda Hubbard	Fizzle
Sep 7 2012 02:54:31:150PM	1120907024	Amanda Hubbard	Got a full shot back. Density ended up lower than programmed, but higher than prior shots; nel 6e19, nebar 1.0e20 m-3. H98=1. Good I-mode at 2 and 3 MW, except for big W injection that almost killed the shot. RF struggles at 4 MW, and Prad is up to 0.9 sec. Good data points, and clearly no H-mode. We will increase density and Neon a bit on next shot.
Sep 7 2012 03:11:09:477PM	1120907025	Amanda Hubbard	Nice one. nebar 1.2-1.3. RF up to 4.1 MW, pretty clean. I-mode all the way, at least 3 and 4 MW steps. (maybe not 2 MW, ne is higher now). H98 > 1. Disrupted after ICRF off, for unclear reasons. Keep this target, try for even more RF, earlier.
Sep 7 2012 03:20:15:613PM	1120907026	Amanda Hubbard	Another good I-mode; clean 4 MW but tripping at 5 MW; no sign of H-mode. 1.15-1.3e20. This one had clear L-I already in 2 MW step (after I just asked Yijun to raise for next shot). nebar was 1.2 e20 at that time. Rebalance and repeat. Should be a good one for demonstrating nice wide power window.
Sep 7 2012 03:45:54:933PM	1120907027	Amanda Hubbard	This time nice clean RF, up to about 5 MW. But not so clean plasma, getting 3 big injections in the high power phase. I'd really like this example shot, so try one more time, adjusting gaps to reduce interaction. After this we will go to step C and try to fuel the I-mode. Which is indeed hot, Te8 ~ 1 keV and T0 7.5 keV! nebar up to 1.4 e 20. 163 kJ, and H98>1, even with the injections. Ploss is exceeding 5 MW. This time no L-I at 2.5 MW. nebar was 1.4. So another threshold data point.
Sep 7 2012 04:01:04:717PM	1120907028	Amanda Hubbard	Trophy shot - IAEA here it comes. 4.7 MW ICRF, stays in I-mode, no obvious injections. Prad rises smoothly. nebar 1.35 to 1.55e10 20 m-3, increasing during high P phase. W 178 kJ, H98 1.1. Now we will move high P phase a bit earlier, and try increasing density with NINJA puff.
Sep 7 2012 04:19:38:237PM	1120907029	Amanda Hubbard	Good. Puffed D2 NINJA at 0.9 secs. Nebar gets to 1.7e20, still solidly in I-mode though it is cooling a bit, and I can see changes in fluctuations. 175 kJ. H98 1.13. This density is roughly where we were finding no I-mode window, at much lower ICRF power, in earlier shots today. So the trajectory does seem to make a difference, worth pursuing. But, we used both LFS and HFS NINJA, seems to be making D-port trip. So adjust to mostly HFS fueling.
Sep 7 2012 04:28:33:887PM	1120907030	Amanda Hubbard	Fizzle.
Sep 8 2012 12:19:07:300PM	1120907031	Amanda Hubbard	Great I-mode, with fuelling. RF 4.7 MW, clean. And NIJA got us to nebar 1.77e20 m-3, still clearly in I-mode with no sign of H-mode transitions. Slight pedestal cooling (1 keV to ~ 850), but only a tiny drop in WMHD (178 to 175 kJ). Another keeper!
Sep 7 2012 05:07:13:143PM	1120907032	Amanda Hubbard	Even nicer! Longer ICRF and NINJA puffs achieved nebar to to 2e20 m-2, with only a few ICRF trips (still 4.7 MW) and keeping WMHD up - to 178 kJ. This is well higher than we've been able to make I-modes before.
Sep 7 2012 05:25:36:487PM	1120907033	Amanda Hubbard	Locked mode attempt - that didn't lock.
Sep 7 2012 05:25:22:377PM	1120907034	Amanda Hubbard	Locked mode shot - that locked (early).
Sep 7 2012 05:53:10:270PM	1120907035	Amanda Hubbard	Change of plans - these shots have been so good we are continuing until 6pm. Next shot will be like 32, but with a larger gas puff, to find out what the density limit to the I-mode is, and what it then transitions to (L or H-mode?). Result: An H-mode. Very strong NINJA puff, from 0.9 secs. Cools edge. I-H transition at 1.026 secs. nebar was just over 2e20, not very different than the highest we reached in I-mode shot 31. Likely it depends somewhat on the power and density/Te nu* trajectory somewhat. We had somewhat less steady ICRF this shot. Next: 1.3 MA
Sep 7 2012 06:13:53:303PM	1120907036	Amanda Hubbard	Good I-mode, 1.3 MA. Peak WMHD 200 kJ. W and T roll over after 0.9 s, when NINJA puff hits. RF also trips, these may be related. High WCM frequency, about 450 kHz. Get an I-H transition late, after edge cools. Last shot coming up: We will delay the NINJA, tune the RF.
Sep 7 2012 06:26:13:820PM	1120907037	Amanda Hubbard	Another good one - worth the wait for cryopump. Got I-mode, no H-mode. Lower density, droops without NINJA. Some ICRF tripping, W HMD 188-155 kJ. THAT'S ALL FOLKS - THE LONG LATE RUN IS VERY MUCH APPRECIATED! WILL BRING GOODIES ON MONDAY. Have a good weekend - I'll post a proper summary on Monday.

Physics Operator Comments
Sep 7 2012 09:06:22:083AM		Ian Hutchinson	Load shot from 1120906003. [This was constructed by YLin from "shot 1: loaded segment 2 from 1120829017, segment 1 from 1120905002"] Set nl04 to 0.6e20 Bt is 5.8T TF current 162500A. Move clearin rampup 25ms earlier because this shot doesn't divert quickly enough. Load.
Sep 7 2012 09:12:18:103AM	1120907001	Ian Hutchinson	Plasma to rampdown. Substantial gas from the RF. Move clearin ramp another 20ms earlier. Load.
Sep 7 2012 09:30:57:847AM	1120907002	Ian Hutchinson	Plasma to rampdown. Move to cryopump. Fill puff to 42ms ending at -0.4s. Load.
Sep 7 2012 09:42:50:460AM	1120907003	Ian Hutchinson	Plasma. Plan a VDE with an attempt at downward motion. Install a zcur downward ramp from 1.2s to -4cm at 1.3s. Turn off fast zcur at 1.22s. Ip to 0.9MA.
Sep 7 2012 10:00:32:230AM	1120907004	Ian Hutchinson	Plasma. VDE at about 1.2s went down. Load from shot 3. Load.
Sep 7 2012 10:10:47:090AM	1120907005	Ian Hutchinson	Plasma. H-mode triggered by 4MW. Ratiomatic neutral pressure now below 0.2.
Sep 7 2012 10:23:54:597AM	1120907006	Ian Hutchinson	Plasma. 2 H-modes.
Sep 7 2012 10:38:19:417AM	1120907007	Ian Hutchinson	Plasma. 2 H-modes.
Sep 7 2012 10:48:15:210AM	1120907008	Ian Hutchinson	Plasma. 1 H-mode.
Sep 7 2012 11:23:13:380AM	1120907009	Ian Hutchinson	Plasma. Good I-mode signatures followed by I-H transition. nl04 to .7e20 Load.
Sep 7 2012 11:32:28:850AM	1120907010	Ian Hutchinson	Plasma. No I-H transition.
Sep 7 2012 11:46:59:043AM	1120907011	Ian Hutchinson	Plasma. Two H-modes. Impurity injection at crossover. nl04 to 0.9e20. Load.
Sep 7 2012 12:09:50:083PM	1120907012	Ian Hutchinson	Plasma. Two H-modes.
Sep 7 2012 12:22:24:180PM	1120907013	Ian Hutchinson	Plasma. Two H-modes nl04 to 1.1e20. Load.
Sep 7 2012 12:45:46:253PM	1120907014	Ian Hutchinson	Plasma. Transitions to H-mode quite quickly at 4MW, perhaps passing through an I-mode phase.
Sep 7 2012 12:55:45:660PM	1120907015	Ian Hutchinson	Plasma. H-mode. nl04 to 0.5e20. Load.
Sep 7 2012 01:08:25:930PM	1120907016	Ian Hutchinson	Plasma. I followed by 3 H-modes. nl04 to .4e20. Load.
Sep 7 2012 01:22:39:450PM	1120907017	Ian Hutchinson	Plasma disrupts at 0.7s. Appears to be a locked mode starting between .55 and .6s. Raise nl04 to .5 at .3s
Sep 7 2012 01:49:14:627PM	1120907018	Ian Hutchinson	Plasma disrupts at 0.7s. Pretty similar. Raise nl04 early substantially more. Load.
Sep 7 2012 01:49:23:267PM	1120907019	Ian Hutchinson	Fizzle.
Sep 7 2012 02:02:46:597PM	1120907020	Ian Hutchinson	Plasma disrupts at 1.05s. Raise nl04 to 0.5 throughout. Enable B-side-lower 150ms Ne puff at 2psi, level 60. Load.
Sep 7 2012 02:16:46:023PM	1120907021	Ian Hutchinson	Plasma disrupts at 0.26s. Very ugly and dirty. Raise early nl04
Sep 7 2012 02:29:53:263PM	1120907022	Ian Hutchinson	Plasma disrupts at 1.2s. nl04 to .7e20. Load.
Sep 7 2012 02:43:19:007PM	1120907023	Ian Hutchinson	Fizzle. ICEF4 to 1320 from 1290A.
Sep 7 2012 02:56:02:300PM	1120907024	Ian Hutchinson	Plasma to rampdown. nl04 to 0.8e20. Load. PG1 Neon puff to 200ms duration. Load.
Sep 7 2012 03:10:48:203PM	1120907025	Ian Hutchinson	Plasma disrupts at 1.2s.
Sep 7 2012 03:31:30:220PM	1120907026	Ian Hutchinson	Plasma to rampdown.
Sep 7 2012 03:47:30:390PM	1120907027	Ian Hutchinson	Plasma to rampdown. Some serious radiation losses at high RF. Set zcur to -.01 to moderate upper outer limiter interaction. Set rcur to .656 (was .657) ditto. Load.
Sep 7 2012 04:00:13:633PM	1120907028	Ian Hutchinson	Plasma to rampdown. Trophy I-mode shot. Rcur in 1 mm to .655.
Sep 7 2012 04:27:30:347PM	1120907029	Ian Hutchinson	Plasma. Good I-mode.
Sep 7 2012 04:53:17:687PM	1120907030	Ian Hutchinson	Fizzle. Cryopump burped.
Sep 7 2012 04:53:28:000PM	1120907031	Ian Hutchinson	Plasma. Good I-mode.
Sep 7 2012 05:08:06:747PM	1120907032	Ian Hutchinson	Plasma. Good I-mode trophy. Try to get locked mode shot. Load seg 4 from seg 4 of 1120830005. Disable B-side lower. No ICRF. Load.
Sep 7 2012 05:21:03:910PM	1120907033	Ian Hutchinson	Plasma to rampdown. Did not appear to lock. Adjust nl04 to get rid of third puff.
Sep 7 2012 05:48:57:117PM	1120907034	Ian Hutchinson	Plasma. Disrupts at 0.77s. Locked mode as required. Switch back to segment 2 as in shot 33. Load.
Sep 7 2012 05:55:48:287PM	1120907035	Ian Hutchinson	Plasma. I to H mode Ip to 1.3MA at 0.6s nl04 to .9e20 Load.
Sep 7 2012 06:20:09:063PM	1120907036	Ian Hutchinson	Plasma to rampdown. I to H mode.
Sep 7 2012 06:20:21:667PM	1120907037	Ian Hutchinson	Plasma to rampdown.

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	08:57:40:477AM	Plasma	Ok
2	09:10:55:853AM	Plasma	Ok
3	09:25:35:037AM	Plasma	Ok
4	09:39:57:620AM	Plasma	Ok
5	09:53:18:510AM	Plasma	Ok
6	10:07:44:417AM	Plasma	Ok
7	10:21:03:403AM	Plasma	Ok
8	10:36:20:527AM	Plasma	Ok
9	10:51:41:100AM	Plasma	Ok
10	11:12:36:203AM	Plasma	Ok
11	11:27:20:823AM	Plasma	Ok
12	11:44:07:277AM	Plasma	Ok
13	12:03:45:443PM	Plasma	Ok
14	12:17:23:947PM	Plasma	Ok
15	12:36:00:580PM	Plasma	Ok
16	12:51:16:227PM	Plasma	Ok
17	01:05:56:463PM	Plasma	Ok
18	01:20:38:243PM	Plasma	Ok
19	01:34:21:797PM	Plasma	Ok
20	01:46:57:060PM	Plasma	Ok
21	02:00:24:593PM	Plasma	Ok
22	02:14:22:847PM	Plasma	Ok
23	02:27:07:303PM	Plasma	Ok
24	02:40:07:583PM	Plasma	Ok
25	02:53:51:023PM	Plasma	Ok
26	03:07:43:050PM	Plasma	Ok
27	03:22:38:163PM	Plasma	Ok
28	03:44:27:427PM	Plasma	Ok
29	03:57:46:353PM	Plasma	Ok
30	04:24:20:040PM	Plasma	Ok
31	04:36:47:080PM	Plasma	Ok
32	04:50:04:183PM	Plasma	Ok
33	05:04:55:713PM	Plasma	Ok
34	05:19:09:340PM	Plasma	Ok
35	05:40:04:307PM	Plasma	Ok
36	05:52:48:737PM	Plasma	Ok
37	06:17:14:463PM	Plasma	Ok