Alcator C-Mod Run 1070726 Information

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Miniproposals
Miniproposal:504
Date Filed: 7/12/2007
Title:Slow Evolution or Two Phase L-H Transitions
First Author:Rachael Mcdermott
Session Leader:Rachael Mcdermott (shots 1-31)

Operators
Session leader(s):Rachael Mcdermott
Physics operator(s):Joseph Snipes
Engineering operator(s):Bill Cochran,Andy Pfeiffer,Gary Dekow,Bill Byford

Engineering Operator Run Comment
MP#504: Slow L-H Transitions with Reversed Field MP#481A Lithium pellets

Session Leader Plans
Entered: Jul 25 2007 05:14:59:560PM
Author: Rachael Mcdermott
Session Leader Plan Thursday 7/26/07 MP 504

The purpose of this experiment is to try and slow down the L-H transition by operating in the unfavorable drift direction and heating just at the threshold power. A slow evolution of the edge temperature pedestal and a reduction in edge fluctuations prior to the L-H transition have been observed in the past when operating under these conditions. We'll try to reproduce and better diagnose these results. This run will utilize the new edge CXRS diagnostics which is now able to make ion temperature, velocity and density measurements in the edge which can then be used to calculate edge radial electric field profiles.

A well boronized machine is requested for this run.
Boronization Plan:

Boronize with 90%/10% boron bottle for at least 10 hours but limit to 120 psi:

tc6 70 to 75 mTorr (if discharge kept out of port)

ef4 at 200 A
rmin 60
rmax 85
rdwell 80

period 20/120

We will begin in LSN low density plasmas attempting to induce slow transition behaviour in the edge tempertature profiles (TS, ECE CXRS) prior to the actual L-H transition. This will be done at several different density points.

Toroidal Field: 5.4 T
Plasma Current: 0.8-1.0 MA
Working Gas Species: D2
Density: nl04 = 0.5-0.9*10^20 m^-2
Use the following reference equilibria: LSN 1070531015 and USN 1070525026

Auxiliary Systems
RF: Yes. 2-3+MW
DNB: Yes.
Current: 6+Amps
Timing: 20ms off 40ms on starting time between .4-.5s (will be varied)
NINJA puffing as necessary for CXRS, Argon as necessary for core rotation measurements

Desired Diagnostics:
All CXRS (DNB/GPI), Edge and Core TS, ECE, scanning probes, bolometry, Hirex and all its relations, Fast Magnetics, PCI, Reflectometry

Shot sequence plan:
For each current/ density you RF current ramp to find threshold power (as necessary)
Subsequent shots will have long pulse steady RF operation just at threshold power starting at t=0.7s. Want 3-4 Good shots at each target

Shots 1-5: LSN, Ip=800kA, nl04=0.7*10^20m^-2

Shots 6-10: LSN, Ip=800k,A nl04=0.9*10^20m^-2.

Shots 11-15: LSN, Ip=800kA, nl04=0.5*10^20m^-2

Shots16-20: LSN, Ip=1MA, nl04=0.7*10^20m^-2

Shots 21-25: LSN, Ip=1MA, nl04=0.5*10^20m^-2

Shots 26-28: USN, Ip=800ka, nl04=0.7*10^20m^-2

Shots 29-30: USN, Ip=800ka, nl04=0.9*10^20m^-2

Physics Operators Plans
Entered: Jul 25 2007 03:17:23:643PM
Author: Joseph Snipes
Engineering setup for Thursday July 26, 2007

MP#504: Slow L-H Transitions with Reversed Field
MP#481A Lithium pellets in reversed B (last 2 hours)

Session leaders: R McDermott, B Bose
Physics operator: J A Snipes

***Overnight boronization***
***This run begins at 8:00 am and continues until 6:00 pm***

Power systems as on 1070531015.

LSN - 1070531015
USN - 1070525026

A-coil configuration for reversed field: [Dtop +Dbot +Jtop -Jbot] and enabled.

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

Enable the following gate valves and shutters: ECE, VUV, DNB, Z-bolo shutters

Torvac setup: Gate valves open after the shot

Specific diagnostics:
HIREX & HIREX-Sr, CXRS (DNB/GPI), Edge and core TS, ECE, scanning probes,
bolometry, fast magnetics, PCI, reflectometry

ICRF Setup: 2 - 3 MW from 0.7 to 1.2 s

LH Setup: LH will be needed early in the pulse at up to 500 kW 0.02 - 0.1 s

DNB: yes, 6+ amps, 20 ms off, 40 ms on starting between 0.4 and 0.5 s

Cryopump: No cryopump for this run

Run plan: Begin with LSN at 5.4 T, 0.8 MA, nl04 = 0.7 x 10^20 m^-2 (e.g., 1070531015) and ramp ICRF power to find the threshold. Then, repeat at constant threshold power for several shots. Repeat at 0.9 x 10^20 m^-2 and then at 0.5 x 10^20 m^-2. Then, repeat the two lower densities at 1 MA and finally, repeat the two higher densities at 0.8 MA in USN (e.g., 1070525026).


Session Leader Summaries
Entered: Jul 27 2007 05:59:20:010PM
Author: Rachael Mcdermott
This run was dedicated to MP504 "slow evolution" or "two phase" evolution H-modes. The objective was to re-create and study, with all available diagnostics, the "two-phase" L-H transition that has previously been observed when operating in the unfavorable drift direction. In these transitions a slow evolution of the edge temperature pedestal culminating in the formation of the edge temp pedestal was observed well before the actual L-H transition, while the edge density showed little evolution until the actual transition. This indicates a separation of energy transport from particle transport.

This time the experiment was performed in reversed field LSN rather than forward field USN, which is a better geometry for the TS diagnostic. We ran at Ip=800KA all day, and densities between nl04=0.4 - 0.9x10^20 m^-2.

The run was sucessful in so for as we created these transitions and collected a very complete data set on them at one of our desired plasma targets. However, the goal was to do this at 5 target plasmas (several densities and plasma currents), and we only achieved one of five.

The run day began at 8AM, but due to camac trouble was delayed.
The RF had trouble coming up in the morning, due to the heavy boronization and much of the beginning portion of the run was dedicated to getting the RF conditioned. Once conditioned the RF performed very well.

The interesting portion of the run began around shot 10 when we finally achieved two very brief H-modes, although they were the result of monster-saw teeth crashing rather than RF power. However, later in this discharge the RF was steady for long periods, and the plasma started to look like it wanted to go into H-mode all on it's own at surprisingly low input power <2MW ICRF

Shot 11 we reduced the density to nl04=0.4x10^20m^-2. and all though it disrupted, there was an L-H transition just before the disruption. Prior to the transition the H-factor reached 1.3, the edge temperature AND density pedestals began to form and large edge toroidal velocity shear was observed.

Starting with shot 13-16 we started getting almost exactly what we wanted; H-modes with edge temperature evolution prior to the transition, little density evolution and a suppresion of edge fluctuations. Althought the RF power was constant the stored energy and the H-factor rose steadily for a good 200ms before the actual L-H transition. The H-factor reached up to 2.5, and the stored energy 120KJ, with 2MW total input power. The temperature pedestals and edge toroidal velocity shear hung around even after the H-mode crashed and the H-factor stayed around 1.4. However, we were getting the H-modes almost too easily and attempted to use slow RF ramps to try to lengthen the "pre-transition" portion of the shot and only get the H-mode at the very end.

The RF power ramps were v. successful on shots 17 & 18. We didn't get an H-mode on shot 17, so increased the RF power ramp a little bit and got the slow transition plus an H-mode at the end of shot 18. Prior to the L-H transition on shot 18 temperature pedestals were already formed that were 80% of the H-mode pedestal and toroidal edge velocity gradients existed 60+% of their h-mode values. There was no appreciable rise in the edge density prior to the transition. Stored energy and the H-factor were rising before the transition, but the RF was ramping as well.

After shot 18 we decided to move onto nl04=0.9x10^20m^-2. Shot 20 was the only shot at this target where we obtained the "two-phase" transition. After this point we were plauged by disruptions, fizzles and duds, oh my! Cameras showed we were cooking something on the inner wall though it's not clear what, and had lots of UFO's flying around. Also, we lost another flux loop, which officially ended the run.

All in all, once the RF was conditioned it ran very cleanly, and we got some very interested results and a very complete data set on at least 1 of the desired target points.



Physics Operator Summaries
Entered: Jul 27 2007 02:39:57:153PM
Author: Joseph Snipes
The run started out slow with some CAMAC problems that ended up costing us the first hour of the run so that the early start still meant first plasma at 9:00 am. Then, there were some problems charging the EF1 capacitor that cost us a couple of test shots. Once we got going, it took some time for the ICRF to tune up, but eventually, we did get a number of good shots with slow L-H transitions that will be quite useful. See the Session Leader's summary for details. We also added a brief pulse of LHCD at the very beginning of the discharge for several shots to do some piggyback work on MP494a, which were successful as a number of high frequency bursting modes were observed with reversed field. Then, we started getting early disruptions. First, they were blamed on the early LH pulse, but then when that was turned off, the disruptions continued and it appeared that something might be sticking into the plasma from somewhere as there were showers of sparks after the disruptions in the JANT camera view. The WIDE1 camera failed for some reason so that its view was not available. Then, I had some problems with startup and modified Br0 and Bz0 a bit and the startup improved, but the disruptions continued early in the current rise. Finally, there was an offset error on flux loop F19 on shot 28, which got even larger for shot 29, which was a dud. So, we stopped the run to discharge a capacitor on F19 and ran a couple of EF3 test shots to see if the flux loop were repaired. Its signal was still lower than its symmetric loop indicating a short circuit. So, we stopped the run early. Steve Wolfe then began rewriting the analysis software to ignore F19 and make up an equilibrium without it. We expect to run again on Tuesday next week, though it will mean finding a new starting point and all old shots will have to be modified to remove the broken flux loop from the analysis. This is the third flux loop to fail together with F10 and F11, so we are seriously limping in the equilibrium analysis at this point and we will soon have to stop and replace at least the broken flux loops to get good quality equilibrium reconstructions again.
Overall, there were 31 shots with 24 plasmas, 5 tests, 1 fizzle and 1 dud.

Shot,Duration(s),Ipmax(MA),Result Shot,Duration(s),Ipmax,Result
| 01 0.000 0.002 Test | 02 1.965 0.813 Plasma |
| 03 0.000 0.002 Test | 04 0.000 0.002 Test |
| 05 1.967 0.818 Plasma | 06 1.965 0.821 Plasma |
| 07 1.966 0.824 Plasma | 08 1.967 0.843 Plasma |
| 09 1.966 0.852 Plasma | 10 1.967 0.857 Plasma |
| 11 1.028 0.861 Plasma | 12 0.609 0.882 Plasma |
| 13 1.423 0.832 Plasma | 14 1.971 0.830 Plasma |
| 15 1.970 0.831 Plasma | 16 1.971 0.834 Plasma |
| 17 1.971 0.832 Plasma | 18 1.971 0.833 Plasma |
| 19 0.365 0.769 Plasma | 20 1.970 0.821 Plasma |
| 21 0.079 0.497 Plasma | 22 1.958 0.813 Plasma |
| 23 0.000 0.049 Fizzle | 24 0.029 0.125 Plasma |
| 25 0.218 0.733 Plasma | 26 0.110 0.551 Plasma |
| 27 0.104 0.412 Plasma | 28 0.041 0.183 Plasma |
| 29 0.000 0.037 Dud | 30 0.000 0.034 Test |
| 31 0.000 0.034 Test
Date 1070726: 31 shots. 24 plasmas. 1 fizzles. 1 dud. 5 Test shots.
(Plasma = Ip gt 60.0 kA Dud = H_alpha lt 0.40 V)
Total plasma duration: 31.55 s (exceeding 100 kA)

Session Leader Comments
Jul 26 2007 09:07:43:730AM1070726002Rachael Mcdermottnext shot lower density a little bit, and increase outer gap by 0.5cm to help RF come up
Jul 26 2007 09:58:29:710AM1070726005Rachael McdermottL-mode, LSN, nl04 .7*10^20
next shot repeat, trying for more power

Jul 26 2007 10:09:28:443AM1070726007Rachael McdermottL-mode, LSN
next shot repeat
RF coming up slowly, try again

Jul 26 2007 10:21:37:723AM1070726008Rachael McdermottSame shot, longer flat RF pulse, LSN, still no H-mode. RF still coming up
Beam current looks good, CX signal still mediocre at best, don't know why.

Jul 26 2007 11:21:26:603AM1070726010Rachael McdermottRepeat RF getting better
edge temperatures coming up a bit every shot
increased DNB arc current to 4.1, test 312 looks good
CX data not so good not much on either H-mode


Jul 26 2007 11:33:48:837AM1070726011Rachael McdermottSomething funny with DNB store. Tree says gate valve did not open, though it clearly did!
toroidal velocity looks H-mode like by .89s. something funny in the build up just before this, too.
Jul 26 2007 11:35:03:090AM1070726013Rachael McdermottMoved DNB start time back to 0.4s.
Jul 26 2007 11:47:53:353AM1070726013Rachael McdermottMoved DNB start time back to 0.4s.
Exactly what we want! Slow transition. yay! Serious velocity shear before the RF transition
Sep 11 2007 06:14:04:180PM1070726014Rachael McdermottAnother great shot, 2-phase transition. Getting into H-mode almost too easily, lower the power down to 1.8-1.9MW, other than that keep everything the same.

There is a tiny impurity injection? at T=.79s that messes up 1 frame of CX data. Frame number 34.
Jul 26 2007 12:27:42:820PM1070726015Rachael McdermottChanging beam timing to 15ms off 30 ms on.
Running NCS cycle between shots, Mass=2 line
Argon puff increased to 60 ms
LH turning on, in the first 100ms for 300kw.
RF reduced to 1.6MW, starting at same time

Jul 26 2007 12:28:30:620PM1070726016Rachael McdermottNext shot Ramp RF from 1Ma to 1.7 MW starting at .7s
Good shot, like the fast beam timing, still enough signal even in L-mode sections
H-factor on this up to 2.5s
Jul 26 2007 12:35:18:127PM1070726017Rachael McdermottGood shot, stored energy and H-factor ramping throughout the shot, but no transition. Ramp the RF hirer next shot.
Next shot Ramp RF from 1.2MW to 2.0MW starting at .7s

Otherwise same shot.

LH still firing in very beginning of shot
Jul 26 2007 12:59:15:030PM1070726018Rachael McdermottGood shot, H-mode at the end of the RF ramp.
Clear temperature pedestal and large toroidal velocity shear before the transition, building throughout the shot
Finished this target, move to higher plasma density
Next Shot nl04 = 0.9*10^20
Ip=800KA
RF ramp from 1.4MW to 2.4MW starting at t=0.7s
Everything else the same.

Jul 26 2007 01:00:54:313PM1070726019Rachael McdermottDisrupted. ouch.
Next: Repeat this shot (minus the disruption)
Changed DNB timing back to 20off 40ms on.


Jul 26 2007 01:21:34:697PM1070726020Rachael McdermottNice. Two-phase transition
Transition to H-mode occured at RF=1.8MW, didn't quite get to requetsed density
Next shot:
Increase requested density to nl04=1.0 to get to 0.9
RF power ramp 0.7s from 1.2MW to 2.0MW


Jul 26 2007 01:25:54:763PM1070726021Rachael McdermottDisruption
Turning off LH.

Physics Operator Comments
Jul 26 2007 07:48:20:497AMSteve Wolfe
Setting up PCS for today's run, in case Joe doesn't make it in. 
Import seg2 from 1070531015
Import seg2 from 1070525026

Start the flipping sequence:
seg2 v01-16: all the coil voltages
     all_p's:ef2 by ef4, ic_ef4u, ip
           change ip from 1MA to 0.8MA
           nl04 from 1 to 0.7e20
     recalc b21_proj
    rename it and turn it on, seg3 off.

Rachel has changed the USN shot request to 1070718015
import seg3 from there
It doesn't seem to need any adjustments.

Load it
Load at 26-Jul-2007 07:47:37.00
Open tree /home/wolfe/pcs_scratch      -1
Open tree done

Joe is in, I'll exit and turn over to him.



Jul 26 2007 08:11:30:423AM1070726001Joseph SnipesShot 1: Took over after Wolfe's setup. The LSN 0.8 MA, 7 x 10^19 m^-2 plasma is in segment 2 and looks OK. The density needed to be flattened at 0.7 x 10^20 m^-2 in segment 3 for the USN. Otherwise, it appears OK. CAMAC problems holding up the start of the run.
Jul 26 2007 08:23:19:950AM1070726001Joseph SnipesShot 1: No power test shot due to computer problems.
Jul 26 2007 09:02:20:163AM1070726002Joseph SnipesShot 2: Try for plasma at 9:00 as usual. ICRF tripped out. Good shot!
Jul 26 2007 09:16:41:507AM1070726003Joseph SnipesShot 3: No power test shot because it was hung in Check.
Jul 26 2007 09:18:43:150AM1070726004Joseph SnipesShot 4: EF1 capacitor charging test shot. No plasma.
Jul 26 2007 09:38:18:343AM1070726005Joseph SnipesShot 5: Increased RCUR by 2 mm to 0.657 m to increase the outer gap by 4 mm. Reduced nl04 from 7 to 6 x 10^19 m^-2. Try for plasma again. Good shot. Still
little RF.
Jul 26 2007 10:02:50:123AM1070726006Joseph SnipesShot 6: Try again with more power. Good shot. Got a bit more ICRF, but still
no H-mode.
Jul 26 2007 10:08:17:520AM1070726007Joseph SnipesShot 7: Repeat. Good shot. Still no H-mode. RF still tripping, particularly J-port.
Jul 26 2007 10:18:56:517AM1070726008Joseph SnipesShot 8: Repeat. Good shot. Still no H-mode.
Jul 26 2007 10:37:32:037AM1070726009Joseph SnipesShot 9: Repeat. Good shot. Still no H-mode. ICRF up to nearly 2 MW.
Jul 26 2007 10:54:13:370AM1070726010Joseph SnipesShot 10: Repeat. Good shot. Got a couple of very brief H-modes finally!
Jul 26 2007 11:04:59:443AM1070726011Joseph SnipesShot 11: Reduced nl04 to 4 x 10^19 m^-2. Reduced RCUR in the rampdown to pull the
plasma further away from the LH grill due to high ion saturation current warnings.
Disrupted at 1.02 s.
Jul 26 2007 11:25:13:310AM1070726012Joseph SnipesShot 12: Enabled argon gas puff and set it to 40 ms duration starting at 0.3 s. Disrupted at 0.6 s.
Jul 26 2007 11:44:36:473AM1070726013Joseph SnipesShot 13: Reduced prepuff by 3 ms to 16 ms duration. RF delayed to 0.6 s. Increased nl04 programming to 5 x 10^19 m^-2. Good startup. Disrupted at 1.4 s.
Several H-modes.
Jul 26 2007 11:52:41:343AM1070726014Joseph SnipesShot 14: Raised nl04 to 6 x 10^19 m^-2. RF turn on set to 0.7 s. Good shot ramped
all the way down. Got a few H-modes.
Jul 26 2007 12:06:56:593PM1070726015Joseph SnipesShot 15: Try again with slightly lower ICRF power. Several H-modes. Good shot.
Jul 26 2007 12:31:26:623PM1070726016Joseph SnipesShot 16: Adding Lower Hybrid pulse from 0.02 to 0.1 s at 300 kW. Argon puff increased to 60 ms duration. Good shot with one H-mode.
Jul 26 2007 12:32:22:013PM1070726017Joseph SnipesShot 17: Repeat. Good shot with ramping ICRF.
Jul 26 2007 12:49:51:770PM1070726018Joseph SnipesShot 18: Increased prepuff by 3 ms to 19 ms duration. Good shot. H-mode late in
the ICRF ramp up.
Jul 26 2007 01:09:19:103PM1070726019Joseph SnipesShot 19: Increased nl04 to 9 x 10^19 m^-2. Disrupted at 0.36 s. Fast electrons
up to the disruption. They increase sharply after 0.08 s. Turn off LH for
the next shot.
Jul 26 2007 01:14:33:983PM1070726020Joseph SnipesShot 20: LH turned off. Density increased at 0.157 s from 3 to 3.5 x 10^19 m^-2
to also try to kill any runaway electrons. Good shot.
Jul 26 2007 01:35:25:633PM1070726021Joseph SnipesShot 21: LH turned back on from 0.02 to 0.07 s. Increased nl04 to 1 x 10^20 m^-2.
Disrupted at 0.08 s.
Jul 26 2007 01:40:47:950PM1070726022Joseph SnipesShot 22: Turned off LH as it seems to have led to the disruption. Try again.
Good shot.
Jul 26 2007 01:50:41:463PM1070726023Joseph SnipesShot 23: Fizzle!
Jul 26 2007 02:09:19:437PM1070726024Joseph SnipesShot 24: Reduced prepuff by 3 ms to 16 ms duration. Failed current rise after
reaching 130 kA. Bz is a little too negative.
Jul 26 2007 02:16:26:837PM1070726025Joseph SnipesShot 25: Increased EF4 current from 1310 to 1325 A. Increased Br0 offset from
0.0025 to 0.003 T. Disrupted at 0.2 s.
Jul 26 2007 02:41:08:863PM1070726026Joseph SnipesShot 26: Repeat. Disrupted at 97 ms. It appears to be injections seen in the JANT video camera view.
Jul 26 2007 02:43:40:680PM1070726027Joseph SnipesShot 27: Try again. Disrupted at 0.09 s.
Jul 26 2007 02:59:43:713PM1070726028Joseph SnipesShot 28: Increased prepuff by 3 ms to 19 ms duration. Raised preprogrammed gas
on PG3 from 0.07 to 0.1 s slightly. Reached 170 kA then died at 35 ms.
Jul 26 2007 03:16:43:687PM1070726029Joseph SnipesShot 29: Reloaded shot 22 and increased EF4 current by 15 A to 1325 A and increased Br0 by 0.5 mT to 3 mT and decreased prepuff by 4 ms to 15 ms duration.
Dud! Offset on F19 up to -4.6E-02 on this and shot 28.
Jul 26 2007 04:04:42:210PM1070726030Joseph SnipesShot 30: EF3 test shot for F19. F19 was not fixed by zapping it with a capacitor.
So, we seem to have another dead flux loop in addition to F10 and F11.
Jul 26 2007 04:26:21:690PM1070726031Joseph SnipesShot 31: Another EF3 test shot for F19. It seems F19 is still not measuring
correctly. So, the run is over until the software can be reconfigured to ignore
this flux loop. Perhaps, we will run again on Tuesday.

Engineering Operator Comments
ShotTimeTypeStatusComment
108:47:19:037AMTestOkNo power test shot
208:59:12:707AMPlasmaOk
309:13:30:473AMPlasmaBadEF1U Capacitor bank problem
409:24:17:687AMTestOkEF1 Cap Bank test
509:36:37:750AMPlasmaOk
609:49:51:873AMPlasmaOk
710:03:37:547AMPlasmaOk
810:16:41:390AMPlasmaOk
910:30:50:670AMPlasmaOk
1010:46:06:343AMPlasmaOk
1111:02:38:067AMPlasmaOk
1211:23:05:370AMPlasmaOk
1311:35:57:370AMPlasmaOk
1411:50:05:543AMPlasmaOk
1512:03:18:247PMPlasmaOk
1612:15:50:887PMPlasmaOk
1712:28:58:790PMPlasmaOk
1812:44:50:137PMPlasmaOk
1912:58:20:263PMPlasmaOk
2001:11:06:793PMPlasmaOk
2101:23:30:590PMPlasmaOk
2201:36:14:760PMPlasmaOk
2301:48:42:197PMPlasmaOk
2402:01:18:507PMPlasmaOk
2502:13:53:740PMPlasmaOk
2602:27:50:333PMPlasmaOk
2702:40:54:583PMPlasmaOk
2802:56:49:917PMPlasmaOk
2903:13:02:200PMPlasmaOk
3003:52:45:260PMTestOkEF3 Test
3104:21:53:890PMTestOk

System Availability
Jul 26 2007 08:46:54:503AM
SystemAvailableCommentAvailability
Changed
OwnerDescriptionWho Can
Change
Active MHDyesFully operationalMar 28 2007 09:19PM (sears)Joe SnipesActive MHD Antennasears,snipes
BESyesvertical array of six views at R ~ 87.3 cm, radial array of three views out to R ~ 89 cm, both at outboard midplane. Three discrete fiber views of beam at R ~ 70.0, 76.5 and 82.5 cm.Feb 06 2007 10:00AM (bravenec)Ron BravenecBeam Emission Spectroscopybravenec
Bolometersyes2Pi diode operational, 2Pi foil being upgrade for noise resistance. Midplane foils calibrated and operational, data in the tree. Outboard midplane AXUV calibrated and operational, data in the tree. Full midplane and divertor views being digitized.Jul 19 2007 04:48PM (mlreinke)Matt ReinkeBolometershutch,mlreinke
BoronizationyesFirst Boronization 5/9/07May 10 2007 04:55PM (irby)Jim IrbyBoronizationdekow,irby
CNPAno Jan 14 2007 02:06PM Ron ParkerCompact Neutral Analyzerparker
Cryopump - Upper DivertoryesThe cryopump is operational in a manual mode. We will be working on interfacing its control system with the C-Mod state machine for semi-automatic operation.May 30 2007 07:58PM (labombard)Brian LaBombardUpper Divertor Cryopumpirby,labombard
CXRSyesThe pedestal toroidal array was installed, spatially and absolutely calibrated. There are 10 chords intersect the beam at the major_R_range=[75,4:87.4]cm. Spatial resolution: 1.2 cm. The F-top poloidal array was installed and spatially calibrated. There are 19 chords intersect the beam at the major_R_range=[67.8:91.0]cm. Spatial resolution: 1.22 cm.Jun 20 2007 05:35PM (bespam)Bill RowanCharge Exchange Spectroscopybespam,blip,rachmcd,rowan
D Alphayes\ha2_bright and \SPECTROSCOPY::TOP.VUV.VIS_SIGNALS:MCP_VIS_SIG1 are availableMar 11 2007 10:28PM (terry)Jim TerryBalmer Alpha Monitorirby,terry,wolfe
Dalsayescamera is re-installed, and view has been calibratedFeb 26 2007 03:28PM (marmar)Earl MarmarVisible Bremsstrahlungmarmar
Disruption Mitigationno Jan 14 2007 02:02PM Bob GranetzGas Jetgranetz,whyte
Divertor IRno Mar 06 2007 10:50AM Glen WurdenDivertor IR Digital Videogwurden,terry
Divertor IR Spectroscopyno Mar 06 2007 10:51AM Glen WurdenDivertor IR Spectroscopygwurden,ldorf,terry
DNByesAll systems are operational, but as of 28 March 2007, the beam needs additional conditioning for full performance shotsMar 28 2007 09:36AM (beals)Bob GranetzDiagnostic Beambeals,granetz
FRC-ECEnoOnly high frequency channels now working (17 to 32). Ch 22 has bad video amp. LO is OK. Problem looks to be in mixer amp unit.Jul 11 2007 10:52AM (phillips)Perry PhillipsHeterodyne ECE-32 channelsphillips
G-Side RatiomaticyesThe gauge is operational.Mar 30 2007 10:54AM (labombard)Brian LaBombardG-side ratiomatic ionization gaugelabombard,toland
GPCyesChs 1-8 operational. May 24 2007 08:40AM (hubbard)Amanda HubbardECE Polychromaterhubbard,schmidt
GPC2yesMost channels (except 1,5,8,10,17) operational. Jun 08 2007 08:29AM (hubbard)Amanda HubbardECE Polychromaterhubbard,schmidt
GPIyesNew view just outside of the lower X-point is operational, but data is being archived locally , not to the tree. Midplane GPI is not operational.Mar 27 2007 01:59PM (terry)Jim TerryGas Puff Imagingterry,zweben
H/Dyesspectral calibration needs to be checked, but system should be ready for the runFeb 26 2007 03:28PM (marmar)Earl MarmarH/D Ratiomarmar
Hirex Jryes Mar 06 2007 08:59AM (rice)John RiceHigh Resolution X-Rayince,rice
Hirex SryesStoring Data, but profiles not yet availableApr 27 2007 01:20PM (ince)John RiceHigh Resolution X-Rayince,rice
HXRyesSomething might be wrong with channel 26; all others working fine.Mar 23 2007 10:43AM (schmidt)Ron ParkerHard X-Ray Arrayparker,schmidt
ICRF D-Antennayes80.5 MHz. Max power is about 1.5 MWJun 20 2007 09:23AM (ylin)Steve WukitchD-port antennawukitch,ylin
ICRF E-Antennayes80 MHz. Maxc power is about 1.5 MWJun 20 2007 09:23AM (ylin)Steve WukitchE-port antennawukitch,ylin
ICRF J-Antennayes78 MHz. 4-strap configuration. Max ~ 3 MW.Jul 17 2007 03:52PM (ylin)Steve WukitchJ-port antennawukitch,ylin
Lower Hybridno6B Pressure window failed. Arcing in 6B, 8B,9B & 23B. May 04 2007 03:44PM (dterry)Ron ParkerLower Hybriddterry,parker
LPIyes Apr 26 2007 08:35PM (bose)Earl MarmarLithium Pellet Injectorbose,marmar
Ly-alphayesMidplane calibrated and operational, data being stored in tree. Divertor views showing significant noise, and not available. Upper view being digitized and analyzed.Jul 19 2007 04:49PM (mlreinke)Matt ReinkeLyman alpha cameraslabombard,mlreinke
McPhersonyesWorking normally.Apr 19 2007 09:52AM (mlreinke)Jim TerryVUV Spectrometermlreinke,terry
MichelsonyesOperational. Mar 28 2007 08:33AM (hubbard)Amanda HubbardECE Te Profileshubbard,schmidt
MKSyesE-Top, E-Bottom, F-top (cryo), G-side, and B-bottom are operational. F-top gauge has a 'sniffer tube' to measure pressures in cryopump gas box.Mar 20 2007 06:42PM (g)Brian LaBombardBaratron pressure gaugeslabombard
MLPnoInitial tests on the A-port scanning probe went well. We need to take care of some control glitches that caused some component failures. May 30 2007 08:01PM (labombard)Brian LaBombardMirror Langmuir Probe Electronics Systemlabombard
MSEno(1) Bandpass filters replacement underway (2) Beam-into-gas spectrum measurement underway (3) Shutter mechanism currently unstable; remains open. (4) Expect beam-into-gas calibrations complete about 4/24. Apr 03 2007 12:05PM (sscott)Steve ScottMotional Stark Effectjinseok,sscott
NeutronsyesBoth neutron systems are fully operationalApr 05 2007 11:19AM (fiore)Catherine FioreNeutron Detectorsfiore
Neuts and HardsyesoperationalMar 21 2007 04:29PM (irby)Jim IrbyX-Ray/Neutron Detector at K-Horirby
NINJAyesAll capillaries displayed by the NINJA_CONTROL GUI have been tested. NINJA puffed on 1070329009 (A-B limiter).Mar 29 2007 11:47AM (terry)Brian LaBombardNINJA gas pufflabombard,terry
PCIyesThe system is to be optimized.May 30 2007 01:12PM (lianglin)Miklos PorkolabPhase Contrast Imagingedlund,lianglin,ntsujii,porkolab
Penning Gaugesyes8 in-situ Penning ionization gauges appear to be operational: CB_DivU, CB_OutL, CB_DivL, KA_OutU, KA_OutL, B_DivL, Cryo_1, Cryo_2. Cryo_1 and Cryo_2 are new and installed in the upper cryopump 'gas-box'.Mar 13 2007 10:01PM (labombard)Brian LaBombardPenning Ionization Gaugeslabombard
Plasma TVyesWIDE1, WIDE2 (chan 33), DANT, JANT and DIV (without an ND filter) are operational.Mar 27 2007 01:53PM (terry)Jim TerryVideo of plasma via several camerasdekow,irby,terry,wolfe
PolarimeternoRetro shutter closedMar 15 2007 11:00AM (irby)Jim IrbyC-Mod Polarimeterirby
Probe Array - ISDyesProbes at 15 of the 16 poloidal locations ('ramped' geometry) are operational. n,Te, particle flux reported every 10 ms.Mar 13 2007 09:47PM (labombard)Brian LabombardInner Lower Divertor Probe Arraylabombard
Probe Array - LHyesAll 6 probes on the lower hybrid launcher (tungsten, 1.5 mm projection) are operational. Mar 13 2007 09:46PM (labombard)Brian LaBombardLower Hybrid Probe Arraylabombard
Probe Array - OSDyesProbes at 10 poloidal locations (one 'ramped' and one 'flush') are operational. n,Te, particle flux reported every 10 ms. Mar 13 2007 09:45PM (labombard)Brian LaBombardOuter Lower Divertor Probe Arraylabombard
Probe Array - UDIVyes14 probes are operational ('ramped' geometry). n,Te, particle flux reported every 10 ms.Two high-gain channels are installed and operational for ECDC plasma diagnosis.Mar 13 2007 12:46PM (labombard)Brian LaBombardUpper Divertor Probe Arraylabombard
Reflectometeryes50, 60, 75 88, 88l,88u and 110 are operational. 60GHz is a little noisy. Variable frequency channel set at 6.473V (~130GHz), not a clear signal.Jul 26 2007 07:14AM (dominguez)Earl MarmarReflectometerdominguez,marmar
Scanning Probe - ASPyesPerpendicular Mach probe head is installed. The drive is operational.Mar 15 2007 09:09PM (labombard)Brian LaBombardA-Port Scanning Probelabombard
Scanning Probe - FSPyesPerpendicular Mach probe head is installed. The probe drive is now operational.Mar 13 2007 09:51PM (labombard)Brian LaBombardF-Port Scanning Probelabombard
Scanning Probe - WASPyesA-port WASP successfully collected data on 04/04. Some intermittent open circuit on SE Electrode. K-WASP took data on 04/11. Both ready to scan as needed.Apr 12 2007 04:18PM (nsmick)Brian LaBombardInner Wall Scanning Probelabombard,nsmick
TCIyesNL_04 at 71.04 cm from 3/9/07 calibrationMay 23 2007 07:38AM (irby)Jim IrbyTwo-Color Interferometerirby,murray
TS - Coreyes2 lasers, 10 spatial channels. Density is calibrated based on ECE cutoffs obtained on 4 May 2007. Additional spatial channels will be added over the next several weeks.Jul 11 2007 09:18AM (jwhughes)Jerry HughesCore Thomson scatteringjwhughes
TS - Edgeyes2 lasers, 20 spatial channels. Fiber holder position is -120.0mm. Density is calibrated according to Raman scattering results from 26 May, supplemented with ECE cutoffs obtained on shot 1070531015.Jul 24 2007 06:49PM (jwhughes)Jerry HughesMillimeter resolution edge Thomson scatteringjwhughes
Vispecyes350 and 670 nm, 4 spatial channelsMay 04 2007 01:02PM (agraf)Alex GrafVisible Spectrometeragraf