Alcator C-Mod Run 1090710 Information

Miniproposals

Miniproposal: 556

Date Filed: 6/29/2009

Title: Lower Bt Operation, Breakdown and Discharge Development

First Author: Chuck Kessel

Session Leader: Chuck Kessel (shots 1-35)

Operators
Session leader(s):	Chuck Kessel
Physics operator(s):	Ian Hutchinson
Engineering operator(s):	Andy Pfeiffer,Bill Cochran,Ed Fitzgerald

Engineering Operator Run Comment
automatically entered by signon - please replace with real comment

Session Leader Plans

Entered: Jul 8 2009 04:10:29:863PM

Author: Chuck Kessel

MP 556 Low Bt startup and discharge development

The purpose of this experiment is to establish low Bt (3.0-3.3 T) breakdown and reference ohmic discharges for use in future experiments. Plans below depend heavily on I. Hutchinson's progress and operating.

recover 1080221010, without aux heating, Ip = 450 kA in 500 ms, flattop out to 1.5 s

1) begin with Bt = 3.3 T, establish breakdown, with as close as possible AT rampup with early divert

2) pursue lower voltage startup to enable lower Bt startup and also smooth out transition from ressitors to power supplies in AT rampup, attempting to maintain early divert time

3) pursue higher plasma currents, 600 kA, 750kA, and >850kA (which gives q95 of 3 depending on shape)

4) density scan and ohmic H-mode access at lower Bt, at various Ip values established

5) understand any impacts on diagnostics at lower field

Physics Operators Plans

Entered: Jul 8 2009 04:09:22:007PM

Author: Ian Hutchinson

Shot references:
________________

1090707010 this week's decent start up.
1030515014 no-commutation startup.
1080221010 slow-ramp-up. But has a bouncy startup that whole day.
segment switch is at .08s.

Null adjustment for lowered Bt
______________________________

We plan to do this with EF1 adjustment that adjusts the current in about
the right place.

According to Wolfe, the effects of these currents are (signed)
EF1 gives B_z: 11.4e-6 T/A
TF gives B_z: 5.96e-8 T/A

150kA corresponds to 5.3T. So 3 T is 85kA = 150 - 75kA.
To compensate -75kA TF requires 75x 5.96e-8 / 11.4e-6 = -0.39 kA EF1.
Currently we have currents of about -5.85kA these will have to be
lowered to about -6.25kA. The PLC limits are set at [-.5,7.5] with
irrational sign reversal so there is no need to adjust PLC limits.

Outline Day plan. (What I planned to do)
________________

1.Commutated Startup: (preprepared)

Take shot 1080221010, which Chuck likes, but has hopeless initiation.
Import segment 1 from 1090907010, the present programming.
Lower B_t to 3T throughout segs 1 and 2, I guess.
Adjust EF1 currents downward by 0.4kA.
Move crowbars on all circuits to 40ms otherwise that shot won't
make much sense and will overshoot the current required.
Look at voltage programming and adjust in line with crowbar timing.
Try.

Tweak fields. Simultaneously tweak later voltages as necessary.
Get breakdown, and current ramp. That's step1. Commutated startup.

2.Uncommutated Startup: (preprepared)

Take shot 1080221010.
Import segment 1 from 1030515014.
Lower the effective voltage after 40ms through current and voltage
programming.

Try
Tweak fields to get breakdown and ramp up.
Adjust later ramp-rate, shape, and position.

3. Further Commutated Adjustments:

If 2. is unsuccessful, reload the results of 1 and move the crowbars
to 30ms or even 25ms. Adjust the voltages and currents to make the
Ip ramp slower during the rest of seg 1.

Prepreparation (What I did.)
______________

Early Crowbar at 3T
___________________

Load from 1080221010. Warning to recalculate magnetics predictors.
Do this for segment 2. Top 8 predictors.
RCUR factor needs to be lowered a bit.

Import seg1 from 1090701021. But Wolfe has changed the Bt offsets.
So instead use 1090907010 from Tuesday, which is already fixed.
No popup warning.

Build all.
Save as shot 1001 in scratch.

Restart PCS.
Load from scratch 1001. Get a warning. Why?
PCS config 21-nov-07 does not match hybrid 7-jul-09.
build all. save as shot 1001. quit. pcs(safe). load from 1001.
Warns again.
Wolfe says that is probably ok. Should go away after a load, which I
can't do at the moment.

Set TF current to 85kA in Seg 1, Seg 2.
Set IC_EF1U (was -5887) to -6287
Set IC_EF1L (was -5885) to -6285
Build all. Save as 1001.

Standard crowbar times are 120ms OHs, 200 EFs. There's no voltage
programming steps in PCS that correspond to that. (Seg2)

The Bus Voltage steps at the 40ms crowbar (of OHs only) are about
-100V OH2, and -400V OH1. These need to be compensated.
Nothing was programmed in for the prior shot.

Also we need to crowbar the EF1s (for which we've only got the late
crowbar to read from). It looks as if the crowbar causes a negative
step of about 400V on EF1 bus. Which is consistent with 70mOmh x 6kA.

Suppose we wish to step to about half the total loop voltage at 40ms.
That is to about 3V from about 6V. This is roughly bus voltages
of 240V EF1, 80V OH2, 375V OH1. These voltages must come from the
power supplies. That's what we should have after the crowbar.
Did that.

For EF3 we need to reduce its voltage also by about a factor of 2.
From about 2200V to about 1100V. Did that. That should complete
the prepreparation for step 1. Save as 1001.

However, that might not be enough. Look at the ICs. The following
have zero gain after time t=0: OH1, OH2.
But EF1 does not. It is zero till 60ms. Then comes on again for no
obvious reason. Zero it. Leave others alone.
Build all. Save as 1001.

Uncommutated 3T.
________________

Start from what we now have. Import seg 1 from 1030515014.
PCS configuration warnings. Error opening dpcs tree.
Call all predictors in seg 1.
Make Br offset .001
Build All. Save as 1002.

Zero the IC_EF1 gain in seg1.
Voltage programming. Change nothing prior to 30ms.
Ramp to the 3V equivalent voltages above at 40ms.
Set TF to -85000A.
Build All. Save as 1002.

That's the prepreparation for step 2.

Made logbook entry as PO-Plan. It did not appear in logbook.

Entered: Jul 8 2009 05:40:22:507PM

Author: Ian Hutchinson

Engineering setup for Friday 10 July.

Low Field Startup.

Engineering settings ought to be the same as 07 July 09. (Tuesday this week).
The one exception is that we will have _all_ crowbars (OH1,2 EF1) at 0.04s.

We will start by lowering the TF current to 85kA (for shot 1).

Later in the day, we will probably be going to no commutation startup.
This was implemented in the past (1030515014) by delaying the commutation
(Open) and the switch Crowbar to well after the shot (e.g. 5sec or later).
At that time there won't be any current in the coils, and the charging of the
commutation banks are therefore unnecessary (and possibly undesirable).

I urge that the Engineering Operator do what homework is necessary to know
how to do the change to no-commutation in the middle of the run with no fuss. Thanks.

Session Leader Summaries

Physics Operator Summaries

Entered: Jul 10 2009 05:26:55:147PM

Author: Ian Hutchinson

Overall
_______

Step 1 of the plan was amazingly successful. We got full plasmas with
3T startup at shot 3 and they all but one went from then
on. Considerable adjustment of the crowbar and segment switch
programming was used to get rid of jolts at those switches. Various
flattop plasma currents were explored at the desire of the SL. A few
disruptions were obtained which proved the robustness of the startup
of the next shot. Two ohmic H-modes were obtained by running at qpsi
of 2.8 shots 14, 15.

Use the startup of shot 15 for future low field slow ramp-ups.

The only real disadvantage is that we already reach 200kA by crowbar.

Step2 of the plan was much less successful. Non-commutation shots at
3T proved to be easy to get a fizzle but a current ramp-up was not
found. The coil currents and voltages appeared to be different from
2003 despite a load from prior shots with plasma. The prior attempts
proved difficult because of persistent duds. This time duds were not a
serious problem, but control of the coil currents and voltages during
initial rise was bothersome.

I am convinced that there is a way to get the machine to start without
commutation, at 3T or 5T field. But it's going to take more physoping
to develop it.

Scorecard --------- Shot,Duration(s),Ipmax(MA),Result Shot,Duration(s),Ipmax,Result | 01 0.000 0.030 Dud | 02 0.000 0.028 Dud | | 03 1.964 0.452 Plasma | 04 1.963 0.452 Plasma | | 05 0.000 0.039 Fizzle | 06 1.970 0.453 Plasma | | 07 1.971 0.452 Plasma | 08 1.964 0.454 Plasma | | 09 1.276 0.602 Plasma | 10 1.967 0.600 Plasma | | 11 0.609 0.792 Plasma | 12 0.942 0.694 Plasma | | 13 1.939 0.689 Plasma | 14 1.918 0.789 Plasma | | 15 1.650 0.789 Plasma | 16 0.000 0.033 Fizzle | | 17 0.000 0.032 Fizzle | 18 0.000 0.032 Fizzle | | 19 0.000 0.032 Fizzle | 20 0.000 0.032 Fizzle | | 21 0.000 0.031 Fizzle | 22 0.000 0.031 Fizzle | | 23 0.000 0.031 Fizzle | 24 0.000 0.030 Fizzle | | 25 0.000 0.030 Fizzle | 26 0.000 0.031 Fizzle | | 27 0.000 0.031 Fizzle | 28 0.000 0.031 Fizzle | | 29 0.000 0.030 Dud | 30 0.000 0.032 Fizzle | | 31 0.000 0.030 Fizzle | 32 0.000 0.031 Fizzle | | 33 0.000 0.030 Fizzle | 34 0.000 0.030 Fizzle | | 35 0.000 0.030 Dud Date 1090710: 35 shots. 12 plasmas. 19 fizzles. 4 duds. 0 System Error. (Plasma = Ip gt 60.0 kA Dud = H_alpha lt 0.40 V) Total plasma duration: 20.13 s (exceeding -100 kA)

Peculiarity for consideration
-----------------------------
The fizzle programming ramps the field up to 5T even though we are only asking
for 3T. That's a bit bizarre, but we don't know if it is a good idea to change it. The programming is not directly available in the PCS screens, but is under
PCS control.

Session Leader Comments

Jul 10 2009 11:08:35:470AM 1090710008 Chuck Kessel shots 003, 004, 006, 006, 007, 008 all good discharges at Bt = 3.42-3.5
Ip = 450 kA at 500 ms
good reproductions of last years discharges with several improvements from Ian
early diverts are preserved

Jul 10 2009 11:40:59:440AM 1090710010 Chuck Kessel good shot at 600 kA by 500 ms, Bt at 3.42 T, all the way thru

Jul 10 2009 12:12:48:143PM 1090710012 Chuck Kessel 011 and 012 targeting higher Ip to get close to q95=3
011 750 kA too high
012 700 kA looks like vertical stability, q95 OK, higher density
good startup and rampup, but disruptions in flattop

Jul 10 2009 12:27:42:753PM 1090710013 Chuck Kessel excellent, 700 kA, q95 = 3.2 ish, good shot all the way thru, Bt = 3.42

Jul 10 2009 12:35:02:610PM 1090710014 Chuck Kessel YES! 800 kA, q95 = 2.8, H-modes late in flattop, Bt = 3.42
Great day for low Bt expt
Thanks Ian!

Physics Operator Comments

Jul 10 2009 08:58:49:893AM Ian Hutchinson Load from /home/hutch/scratch/1001 build all, load. Ok.

Tell engineering operators to start TF at -0.5s.
Draw TF curve that takes us through 88kA at 0s.
EF1U to -6187A EF1L to -6185A.
PG4 Gas prefill is 17ms. Leave alone.

Bus Currents in this shot at t=0 were (L,U):
EF1 -5825 -5874
EF2 -1951, -2000
EF4 -1265
OH1 -19700
OH2 -25710 26237

Load

Jul 10 2009 09:26:46:250AM 1090710001 Ian Hutchinson Pressures are 6 psi in B-top, 40psi in B-main.
We've lost the ratiomatic. There's a short. We're running blind.
Problem with EF3 upper cooling delays us slightly.
Let's go!

Dud.
Null fairly open.
At times t=0 and t=10ms
Bz=-2.3 +4.3 mT
Br=-.5 -.5mT
Slow the Bz ramp: EF3 to 2400V.
EF1s to -608. from -618.A
Load.

Jul 10 2009 09:44:03:767AM 1090710002 Ian Hutchinson Dud.
Null opened up as expected however Bz rose too much.
Bz= -.8, +4.2 Br=-.5,-.5

TF demands to 89000 99000 at -20, +20ms because we are not getting what
we are asking for.
ICEF4 to -1340 from -1290
Load

Jul 10 2009 10:06:10:410AM 1090710003 Ian Hutchinson Plasma to Rampdown.
Breakdown at 5.2ms. Very nice open null.
Plasma seems high by 2.5cm initially then comes down.
Nothing visible on bounce scope.

Reaches 200kA at 40ms. The crowbar crunches the plasma on inner wall.
EF3 voltage to 900V from 1100V at crowbar.
Tweak TF current in seg1. Set to 93500 in seg2.
Load

Jul 10 2009 10:19:42:957AM 1090710004 Ian Hutchinson Plasma to rampdown.
Breakdown at 4.9ms. Slight bounce early.
Still big inward thrash at crowbar. Better than it was but still bad.
Z-thrash at segment switch.

TF to 96kA in seg1.
Ef3 to 700V at 41ms.
Zcur to 0 vs -1cm in seg2 at 80ms.

Jul 10 2009 10:31:14:893AM 1090710005 Ian Hutchinson Fizzle. Bounce at 15ms not survived this time. Probably on outside.

EF3V to 2600 from 2400 at 13ms.
Load.

Jul 10 2009 10:46:32:440AM 1090710006 Ian Hutchinson Plasma to rampdown.
Breakdown at 5.1ms
Still a pretty severe bounce.

EF3V to 2800 at 13ms.
Move OH transition programming 2ms earlier.

Jul 10 2009 11:01:08:910AM 1090710007 Ian Hutchinson Plasma till rampdown.
Breadown at 5.2ms. Bounce still present at 12ms.
Crowbar excursion substantially reduces.

Move EF3 crowbar programming step 2ms earlier.
Raise EF1 voltage during 50-80ms. Load.
Add 7ms EF3V point at 2800V. Load.

Jul 10 2009 11:17:29:393AM 1090710008 Ian Hutchinson Plasma to rampdown. Early bounce gone.

Put a point in seg1 at 30ms to reduce the TF.
Enable Hirex Sr. Enable Ar puff 30ms.
Current to 0.6MA at .5s
RCUR to .65 at 50ms.
EF1 voltage increase initial point of seg2.

Jul 10 2009 11:38:39:533AM 1090710009 Ian Hutchinson Plasma disrupts at 1.27s. Growing vertical oscillation.

Add 3mm to rcur late, and 2mm to rcur at .25s to fix vertical oscillations.
Add 5mm to rcur at 80ms in seg 2 to fix the excursion at seg switch.

Jul 10 2009 11:43:12:097AM 1090710010 Ian Hutchinson Plasma to rampdown.
Late oscillation fixed. 0.2s still a bit problematic.

Ip to 0.75MA
EF3V to 1000 in seg2 start.
Tweak rcur out a bit in seg2.
Load

Jul 10 2009 12:02:46:893PM 1090710011 Ian Hutchinson Plasma disrupts at .6s.
Getting several minor disruptions as go through qpsi of 3.

Ip to .7MA. nl04 to .6e20.

Jul 10 2009 12:24:06:190PM 1090710012 Ian Hutchinson Plasma disrupts at .92s. Signs of vertical stability problems.

EF1V to 50V from 100V at .1s in seg2.
Move plasma out 2mm at .8s onwards.
Tweak OH1 crowbar programming.

Jul 10 2009 12:30:37:660PM 1090710013 Ian Hutchinson Plasma to rampdown.

Ip to 0.8MA.
Move Rcur out another 1mm.
Move Rcur out 5mm in seg1.
EF1V to 0 at 80ms in seg2.
Disable Argon.

Jul 10 2009 12:45:10:017PM 1090710014 Ian Hutchinson Plasma till rampdown. H-mode at 1.3s. qpsi=2.8

Rcur to .66 in seg2.

Jul 10 2009 01:05:22:377PM 1090710015 Ian Hutchinson Plasma till rampdown. Disruption at 1.65s. H-mode from 1.1s on.

Move to uncommutated startup.
Call for commutation to be turned off.
Load segment4 from shot 15 segment1 to get TF programming.
Copy and paste.
Move rcur out in seg1.
ICEF1s are -6000A. And that's pretty much what we got. We need to subtract
about 0.4kA from each because of the lowered field.
Set both to -6400A.
Load.

Jul 10 2009 01:16:36:753PM 1090710016 Ian Hutchinson Breakdown at 20ms. Bad null till too late. No Bz ramp.
I guess a bit too negative EF1.

ICEF1 to -6300 from -6400A
ICEF4 to -1340 from -1320A
EF3V to 1500 from 1300V.
Load

Jul 10 2009 01:29:18:330PM 1090710017 Ian Hutchinson Fizzle. Breakdown at 11ms. Gas current ~10kA.

ICEF1s to -6100A
ICEF4 to -1370A
EF1V to 1800V
Load

Jul 10 2009 01:42:33:910PM 1090710018 Ian Hutchinson Fizzle. Open null. Breakdown at 13ms. Fixed the gradients but not the
Bz ramp.

ICEF4 to -1410A
EF3 raise some more: 2100 max.

Jul 10 2009 01:56:39:487PM 1090710019 Ian Hutchinson Fizzle. Breakdown at 11ms.
Bz is nulled from early. But there's no field ramp.

ICEF4 to -1450A
EF3 to 2300V at 13-19ms
OH2s drop to 100V at 13ms.

Jul 10 2009 02:09:32:127PM 1090710020 Ian Hutchinson Fizzle.

EF3V to 2300V at 5ms. Bring up the voltage quicker.

Jul 10 2009 02:22:41:347PM 1090710021 Ian Hutchinson Fizzle. Breakdown at 10ms.

Lower OH2V 13-25ms to 100/90V.
We seem to be getting more voltage than is preprogrammed. I think that must
be Rcur.

Jul 10 2009 02:35:49:783PM 1090710022 Ian Hutchinson Fizzle. Breakdown at 9.7ms.

Lower OH2Vs to 80V at 10-15ms.
Br offset to 1.5mT from 1mT

Jul 10 2009 02:48:10:813PM 1090710023 Ian Hutchinson Fizzle. Breakdown at 10ms.

OH2s to 70/80V during 10-20ms.

Jul 10 2009 03:02:51:970PM 1090710024 Ian Hutchinson Fizzle. Bkdwn 11ms.

Lower OH1V to 550V from 624 5-15ms.

Jul 10 2009 03:21:09:007PM 1090710025 Ian Hutchinson Fizzle. Hardly any change.
Seems that OH1 is railed.

EF3V to 2600 from 2300V.
Br offset back to 1mT.

Jul 10 2009 03:26:52:830PM 1090710026 Ian Hutchinson Fizzle.

OH1V to 500V.
It's pretty clear that we are needing very different settings to get anything
close to the same null. This might be because of different power supply
gains or it might be different hardware.

Jul 10 2009 03:39:34:287PM 1090710027 Ian Hutchinson Fizzle. No visible change. A clear demo that OH1 is railed well above its
voltage setting. However, it appears to be PCS demand.

Set OH1V to 300V to get a bench mark.

Jul 10 2009 03:51:32:960PM 1090710028 Ian Hutchinson Fizzle. Fields actually changed this time. Fairly sensible field rise.
Much more rapid.
Breakdown 11ms.
When asking for 300V we get nearly 500V

Reduce OH1v second point after t=0.
Reduce EF3V at 5ms.

Jul 10 2009 04:08:09:817PM 1090710029 Ian Hutchinson Dud. I guess we went too far.

Move oh1 voltage step 1ms earlier.
ICEF4 to -1420A

Jul 10 2009 04:18:54:990PM 1090710030 Ian Hutchinson Fizzle. 20kA of gas current, then crunched on inboard.

OH1V notch to 400 from 300

Jul 10 2009 04:29:43:910PM 1090710031 Ian Hutchinson Fizzle.

Import seg1 from 30
EF3V to 2400 from 2600V at 11-20ms

Jul 10 2009 04:49:50:677PM 1090710032 Ian Hutchinson Fizzle. Breakdown at 9ms.

EF3V 5ms point to 2600V from 2400V.

Jul 10 2009 05:04:47:927PM 1090710033 Ian Hutchinson Fizzle.

ICEF1s to 6000A.
EF3V to 2300 at 12ms.

Jul 10 2009 05:05:43:990PM 1090710034 Ian Hutchinson Fizzle.

ICEF1s to 6050
EF3V to 2300 at 19ms.

Engineering Operator Comments

Shot Time Type Status Comment

1 09:12:51:877AM Plasma Ok

2 09:29:12:267AM Plasma Ok

3 09:41:51:597AM Plasma Ok

4 10:02:09:283AM Plasma Ok

5 10:16:42:487AM Plasma Ok

6 10:29:18:847AM Plasma Ok

7 10:44:30:360AM Plasma Ok

8 10:59:56:673AM Plasma Ok

9 11:14:37:207AM Plasma Ok

10 11:28:20:363AM Plasma Ok

11 11:40:58:877AM Plasma Ok

12 12:01:45:330PM Plasma Ok

13 12:14:30:267PM Plasma Ok

14 12:28:04:690PM Plasma Ok

15 12:42:27:487PM Plasma Ok

16 01:01:00:487PM Plasma Ok

17 01:14:31:610PM Plasma Ok

18 01:27:27:940PM Plasma Ok

19 01:40:45:957PM Plasma Ok

20 01:54:50:250PM Plasma Ok

21 02:07:47:080PM Plasma Ok

22 02:20:56:520PM Plasma Ok

23 02:33:48:767PM Plasma Ok

24 02:46:23:220PM Plasma Ok

25 02:59:24:017PM Plasma Ok

26 03:11:55:173PM Plasma Ok

27 03:25:04:000PM Plasma Ok

28 03:37:41:443PM Plasma Ok

29 03:51:19:910PM Plasma Ok

30 04:04:34:567PM Plasma Ok

31 04:17:02:363PM Plasma Ok

32 04:31:37:600PM Plasma Ok

33 04:44:05:770PM Plasma Ok

34 04:56:37:240PM Plasma Ok

35 05:10:17:677PM Plasma Ok

System Availability

Jul 10 2009 09:12:29:237AM

System Available Comment Availability
Changed Owner Description Who Can
Change
Active MHD no secured - tagged out Jun 02 2008 11:03AM (sears) Joe Snipes Active MHD Antenna sears,snipes
BES yes 7 horizontal views spread out R_maj=[0.72-0.9m], 3 cm over the tokamak midplane (beam) Jul 09 2009 05:12PM (bespam) Bill Rowan Beam Emission Spectroscopy bespam,liao,rowan
Bolometers yes Most systems collecting data but not calibrated. WB2 and WB1 not attached. Jul 07 2009 01:00PM (mlreinke) Matt Reinke Bolometers hutch,mlreinke
Boronization no Bottle Removed from the Cell, Piezo box on Igloo Removed. System in safe mode for In-Vessel Access May 30 2008 02:25PM (dekow) Jim Irby Boronization dekow,irby
CNPA no Single channel CNPA available as of 12/1707 Jun 10 2009 10:22AM (twf) Ron Parker Compact Neutral Analyzer parker
Cryopump - Upper Divertor no external cryopump hardware removed from machine --- system is safe May 30 2008 01:48PM (irby) Brian LaBombard Upper Divertor Cryopump irby,labombard
CXRS yes The wide-view toroidal array was installed, spatially and absolutely calibrated. There are 7 toroidal chords intersect the beam at the major_R_range=[74.2:83.6]cm. Spatial resolution: 1.2 cm. The F-top wide-view poloidal array was installed and spatially calibrated. There are 19 chords intersect the beam at the major_R_range=[0.65:0.9.]m. Spatial resolution: 1.22 cm. Jul 09 2009 05:16PM (bespam) Bill Rowan Charge Exchange Spectroscopy bespam,blip,liao,rachmcd,rowan
D Alpha yes \ha2_bright is available; \SPECTROSCOPY::TOP.VUV.VIS_SIGNALS:MCP_VIS_SIG1 is not available Jul 01 2009 09:45AM (terry) Jim Terry Balmer Alpha Monitor irby,terry,wolfe
Dalsa no poses no safety hazard for people working around the machine May 30 2008 01:54PM (marmar) Earl Marmar Visible Bremsstrahlung marmar
Disruption Mitigation no safely disabled; ready to be dismantled May 28 2008 10:22AM (granetz) Robert Granetz Gas Jet granetz,whyte
Divertor IR no Mar 06 2007 10:50AM Glen Wurden Divertor IR Digital Video gwurden,terry
Divertor IR Spectroscopy no Mar 06 2007 10:51AM Glen Wurden Divertor IR Spectroscopy gwurden,terry
DNB no power locked & tagged out; gate valve disabled May 28 2008 10:03AM (granetz) Robert Granetz Diagnostic Neutral Beam dterry,granetz,gung
ECDC no 6/10/09 Magnetron relocated to west wall in cell at H-port. All controls and hardware have been installed but need to be tested prior to full operation. Magnetron Unplugged and Red tagged, PEI breaker red tagged, Safe for In-Vessel Activity Jun 10 2009 02:35PM (dekow) Jim Irby 2.45 GHz, 3 kW, discharge cleaning system dekow,irby,pfeiffer
FRC-ECE no Computer system problem, the lower freq. 16 channels are ready. Jun 26 2009 03:37PM (phillips) Perry Phillips Heterodyne ECE-32 channels phillips
G-Side Ratiomatic yes Gauge installed. Controlleer is on. Jun 24 2009 10:00AM (toland) Brian LaBombard G-side ratiomatic ionization gauge labombard,toland
Glow Discharge no 6/10/09: Paddles meggered at 1000 v to machine ground (>300 Mohm) prior to closing the vacuum chamber. Plugs for Power Supply and Controls Unplugged and Red Tagged, Safe for In-Vessel Access Jun 10 2009 01:47PM (dekow) Jim Irby 1 kV, 5 A, glow discharge system dekow,dterry,irby
GPC yes Operational, but NOT CALIBRATED. Ch 1 seems low, others reasonable. Jun 26 2009 08:25AM (hubbard) Amanda Hubbard ECE Polychromater hubbard,schmidt
GPC2 yes Operational, but NOT CALIBRATED Jun 26 2009 08:26AM (hubbard) Amanda Hubbard ECE Polychromater hubbard,schmidt
GPI yes The Xpt-view, the midplane-view cameras are operational. The innerwall GPI (coupled to the fast-diodes) is available. Jul 01 2009 09:45AM (terry) Jim Terry Gas Puff Imaging terry,zweben
H/D yes poses no safety hazard for people working around the machine Jun 18 2009 01:04PM (marmar) Earl Marmar H/D Ratio marmar
HEAT no Disconnect switch is open, reg tagged and locked. Shunt Trip Breaker is opened. Safe for in-vessel work. Jun 04 2008 12:24PM (dekow) Gary Dekow - Machine Heaters - burke,dekow
Hirex Jr yes Hirex-Jr has been installed and tested Jun 17 2009 11:54AM (rice) John Rice High Resolution X-Ray ince,rice
Hirex Sr no Hirex-Sr has been removed from the cell and is in temporary storage May 30 2008 01:48PM (ince) John Rice High Resolution X-Ray ince,rice
HXR no In safe mode (high voltage turned off) May 27 2008 09:19PM (schmidt) Ron Parker Hard X-Ray Array parker,schmidt
ICRF D-Antenna no Transmission line disconnected. HV tagged out. Safe for machine entry. May 28 2008 08:16AM (ylin) Steve Wukitch D-port antenna wukitch,ylin
ICRF E-Antenna no Transmission line disconnected. HV tagged out. Safe for machine entry. FFT out May 28 2008 08:17AM (ylin) Steve Wukitch E-port antenna wukitch,ylin
ICRF J-Antenna no HV tagged. Safe for machine entry. loop dissembly started. May 28 2008 08:17AM (ylin) Steve Wukitch J-port antenna wukitch,ylin
Lower Hybrid no Breaker locked and tagged out. Waveguide disassembly started. Open Waveguides have been shorted. May 28 2008 09:47AM (dterry) Ron Parker Lower Hybrid dterry,parker,wallaceg
LPI no Beam line removed May 30 2008 02:09PM (bose) Earl Marmar Lithium Pellet Injector bose,marmar
Ly-alpha yes Midplane, WB4-LY, LEDGE-LY all collecting data but processed data not in tree. WB1-LY not attached. Jul 07 2009 01:01PM (mlreinke) Matt Reinke Lyman alpha cameras labombard,mlreinke
McPherson no Rolled back Jun 17 2009 03:43PM (mlreinke) Jim Terry VUV Spectrometer mlreinke,terry
Michelson yes Operational. NOT RECALIBRATED Jun 26 2009 11:25AM (hubbard) Amanda Hubbard ECE Te Profiles hubbard,schmidt
MKS yes Gauges are on. B-bottom is reading identically zero - probably a CAMAC problem. Jun 30 2009 09:40PM (labombard) Brian LaBombard Baratron pressure gauges labombard
MLP no Initial 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 LaBombard Mirror Langmuir Probe Electronics System labombard
MSE no As of 6/10/09, MSE is calibrated & ready to go. Awaiting DNB. Jun 10 2009 10:34AM (sscott) Steve Scott Motional Stark Effect jinseok,sscott
Neutrons yes Neutron detectors are calibrated and ready to go. Voltages will be turned on prior to first plasma. Jun 10 2009 10:35AM (fiore) Catherine Fiore Neutron Detectors fiore
Neuts and Hards yes Operational --- Uncalibrated and needs to be positioned at port Jun 25 2009 05:08PM (irby) Jim Irby X-Ray/Neutron Detector at K-Hor irby
NINJA no Capillaries were tested in-vessel. Plenum needs to be baked and tested for leaks. Jun 30 2009 09:41PM (labombard) Brian LaBombard NINJA gas puff labombard,terry
PCI no Both HeNe and CO2 lasers have been shutdown. System is safe. May 30 2008 01:58PM (lianglin) Miklos Porkolab Phase Contrast Imaging edlund,lianglin,ntsujii,porkolab
Penning Gauges yes High voltage is enabled (on during INIT, off during RECOOL). Jun 30 2009 09:42PM (labombard) Brian LaBombard Penning Ionization Gauges labombard
Plasma TV yes WIDE1, WIDE2 (chan 33), DANT, JANT and DIV are operational. Jul 01 2009 09:46AM (terry) Jim Terry Video of plasma via several cameras dekow,irby,terry,wolfe
Polarimeter no Safe for Machine Entry Sep 14 2007 12:17PM (irby) Jim Irby C-Mod Polarimeter irby
Power - Alternator Air Switch yes Checked and Operational as of 06/18/09 Jun 19 2009 08:04AM (irby) Gary Dekow feeds all the other supplies cochran,dekow,dterry,irby
Power - PEI yes Operational ---- ECDC running as required Jun 19 2009 08:06AM (irby) Gary Dekow PEI System cochran,dekow,dterry,irby
Power - TMX yes Checked out and ready for Magnet Tests as of 06/18/09 Jun 19 2009 08:07AM (irby) Gary Dekow Ef2s,. EFCs and A-Coils byford,cochran,dekow,dterry,irby
Power Systems yes Checked out and ready for Magnet Tests as of 06/18/09 Jun 19 2009 08:07AM (irby) Jim Irby C-Mod Magnet Supplies byford,cochran,dekow,dterry,irby
Probe Array - ISD no Power supplies are off. All cables are unplugged at the F-port rack. Jun 02 2008 01:10PM (labombard) Brian Labombard Inner Lower Divertor Probe Array labombard
Probe Array - LH no All power supplies are off. Cables are unplugged at the A-port rack. Jun 02 2008 01:10PM (labombard) Brian LaBombard Lower Hybrid Probe Array labombard
Probe Array - OSD no All power supplies are off. Cables are unplugged at the F-port rack. Jun 02 2008 01:11PM (labombard) Brian LaBombard Outer Lower Divertor Probe Array labombard
Probe Array - UDIV no All power supplies are off. Cables are unplugged at the F-port rack. Jun 02 2008 01:11PM (labombard) Brian LaBombard Upper Divertor Probe Array labombard
Reflectometer yes As of 7/8/09, the 50, 60, 75 and 88 (baseband, lsb and usb) are available. The 140 and swept are connected and currently being tested but should be available too. The 110 is offline Jul 08 2009 09:47AM (dominguez) Earl Marmar Reflectometer dominguez,marmar
Scanning Probe - ASP no Probe is retracted behind gatevalve. Air lines are disconnected. Probes cables disconnected at A-port rack. Jun 02 2008 01:14PM (labombard) Brian LaBombard A-Port Scanning Probe labombard
Scanning Probe - FSP no Probe is retracted fully. Air lines are disconnected. Probe cables disconnected at F-port rack. Jun 02 2008 01:13PM (labombard) Brian LaBombard F-Port Scanning Probe labombard
Scanning Probe - WASP no Probe cables are disconnected at F-port rack. Jun 02 2008 01:17PM (labombard) Brian LaBombard Inner Wall Scanning Probe labombard,nsmick
Sparker yes Sparker now at K-Hor. Set for 100 uA of current. Will up to 200 uA before first plasma Jun 18 2009 01:01PM (irby) Jim Irby Field Emission Preionization for C-Mod dekow,irby,parkin
TCI yes System restarted and aligned. Several chords available including NL04. Density Feedback available. Ready for plasma. Jun 18 2009 09:15AM (murray) Jim Irby Two-Color Interferometer irby,murray
TS - Core no Expected availability: week of June 29 Jun 24 2009 01:31PM (jwhughes) Jerry Hughes Core Thomson scattering jwhughes,yma
TS - Edge no Expected availability: week of July 20 Jun 24 2009 01:32PM (jwhughes) Jerry Hughes Millimeter resolution edge Thomson scattering jwhughes,yma
Vispec no 350 and 670 nm, 4 spatial channels Nov 28 2007 09:58AM (agraf) Alex Graf Visible Spectrometer agraf
XTOMO yes cables attached, DAQ test run, ready for first plasma Jun 17 2009 03:42PM (mlreinke) Bob Granetz X-Ray Tomography granetz,mlreinke

Session Leader Comments
Jul 10 2009 11:08:35:470AM	1090710008	Chuck Kessel	shots 003, 004, 006, 006, 007, 008 all good discharges at Bt = 3.42-3.5 Ip = 450 kA at 500 ms good reproductions of last years discharges with several improvements from Ian early diverts are preserved
Jul 10 2009 11:40:59:440AM	1090710010	Chuck Kessel	good shot at 600 kA by 500 ms, Bt at 3.42 T, all the way thru
Jul 10 2009 12:12:48:143PM	1090710012	Chuck Kessel	011 and 012 targeting higher Ip to get close to q95=3 011 750 kA too high 012 700 kA looks like vertical stability, q95 OK, higher density good startup and rampup, but disruptions in flattop
Jul 10 2009 12:27:42:753PM	1090710013	Chuck Kessel	excellent, 700 kA, q95 = 3.2 ish, good shot all the way thru, Bt = 3.42
Jul 10 2009 12:35:02:610PM	1090710014	Chuck Kessel	YES! 800 kA, q95 = 2.8, H-modes late in flattop, Bt = 3.42 Great day for low Bt expt Thanks Ian!

Physics Operator Comments
Jul 10 2009 08:58:49:893AM		Ian Hutchinson	Load from /home/hutch/scratch/1001 build all, load. Ok. Tell engineering operators to start TF at -0.5s. Draw TF curve that takes us through 88kA at 0s. EF1U to -6187A EF1L to -6185A. PG4 Gas prefill is 17ms. Leave alone. Bus Currents in this shot at t=0 were (L,U): EF1 -5825 -5874 EF2 -1951, -2000 EF4 -1265 OH1 -19700 OH2 -25710 26237 Load
Jul 10 2009 09:26:46:250AM	1090710001	Ian Hutchinson	Pressures are 6 psi in B-top, 40psi in B-main. We've lost the ratiomatic. There's a short. We're running blind. Problem with EF3 upper cooling delays us slightly. Let's go! Dud. Null fairly open. At times t=0 and t=10ms Bz=-2.3 +4.3 mT Br=-.5 -.5mT Slow the Bz ramp: EF3 to 2400V. EF1s to -608. from -618.A Load.
Jul 10 2009 09:44:03:767AM	1090710002	Ian Hutchinson	Dud. Null opened up as expected however Bz rose too much. Bz= -.8, +4.2 Br=-.5,-.5 TF demands to 89000 99000 at -20, +20ms because we are not getting what we are asking for. ICEF4 to -1340 from -1290 Load
Jul 10 2009 10:06:10:410AM	1090710003	Ian Hutchinson	Plasma to Rampdown. Breakdown at 5.2ms. Very nice open null. Plasma seems high by 2.5cm initially then comes down. Nothing visible on bounce scope. Reaches 200kA at 40ms. The crowbar crunches the plasma on inner wall. EF3 voltage to 900V from 1100V at crowbar. Tweak TF current in seg1. Set to 93500 in seg2. Load
Jul 10 2009 10:19:42:957AM	1090710004	Ian Hutchinson	Plasma to rampdown. Breakdown at 4.9ms. Slight bounce early. Still big inward thrash at crowbar. Better than it was but still bad. Z-thrash at segment switch. TF to 96kA in seg1. Ef3 to 700V at 41ms. Zcur to 0 vs -1cm in seg2 at 80ms.
Jul 10 2009 10:31:14:893AM	1090710005	Ian Hutchinson	Fizzle. Bounce at 15ms not survived this time. Probably on outside. EF3V to 2600 from 2400 at 13ms. Load.
Jul 10 2009 10:46:32:440AM	1090710006	Ian Hutchinson	Plasma to rampdown. Breakdown at 5.1ms Still a pretty severe bounce. EF3V to 2800 at 13ms. Move OH transition programming 2ms earlier.
Jul 10 2009 11:01:08:910AM	1090710007	Ian Hutchinson	Plasma till rampdown. Breadown at 5.2ms. Bounce still present at 12ms. Crowbar excursion substantially reduces. Move EF3 crowbar programming step 2ms earlier. Raise EF1 voltage during 50-80ms. Load. Add 7ms EF3V point at 2800V. Load.
Jul 10 2009 11:17:29:393AM	1090710008	Ian Hutchinson	Plasma to rampdown. Early bounce gone. Put a point in seg1 at 30ms to reduce the TF. Enable Hirex Sr. Enable Ar puff 30ms. Current to 0.6MA at .5s RCUR to .65 at 50ms. EF1 voltage increase initial point of seg2.
Jul 10 2009 11:38:39:533AM	1090710009	Ian Hutchinson	Plasma disrupts at 1.27s. Growing vertical oscillation. Add 3mm to rcur late, and 2mm to rcur at .25s to fix vertical oscillations. Add 5mm to rcur at 80ms in seg 2 to fix the excursion at seg switch.
Jul 10 2009 11:43:12:097AM	1090710010	Ian Hutchinson	Plasma to rampdown. Late oscillation fixed. 0.2s still a bit problematic. Ip to 0.75MA EF3V to 1000 in seg2 start. Tweak rcur out a bit in seg2. Load
Jul 10 2009 12:02:46:893PM	1090710011	Ian Hutchinson	Plasma disrupts at .6s. Getting several minor disruptions as go through qpsi of 3. Ip to .7MA. nl04 to .6e20.
Jul 10 2009 12:24:06:190PM	1090710012	Ian Hutchinson	Plasma disrupts at .92s. Signs of vertical stability problems. EF1V to 50V from 100V at .1s in seg2. Move plasma out 2mm at .8s onwards. Tweak OH1 crowbar programming.
Jul 10 2009 12:30:37:660PM	1090710013	Ian Hutchinson	Plasma to rampdown. Ip to 0.8MA. Move Rcur out another 1mm. Move Rcur out 5mm in seg1. EF1V to 0 at 80ms in seg2. Disable Argon.
Jul 10 2009 12:45:10:017PM	1090710014	Ian Hutchinson	Plasma till rampdown. H-mode at 1.3s. qpsi=2.8 Rcur to .66 in seg2.
Jul 10 2009 01:05:22:377PM	1090710015	Ian Hutchinson	Plasma till rampdown. Disruption at 1.65s. H-mode from 1.1s on. Move to uncommutated startup. Call for commutation to be turned off. Load segment4 from shot 15 segment1 to get TF programming. Copy and paste. Move rcur out in seg1. ICEF1s are -6000A. And that's pretty much what we got. We need to subtract about 0.4kA from each because of the lowered field. Set both to -6400A. Load.
Jul 10 2009 01:16:36:753PM	1090710016	Ian Hutchinson	Breakdown at 20ms. Bad null till too late. No Bz ramp. I guess a bit too negative EF1. ICEF1 to -6300 from -6400A ICEF4 to -1340 from -1320A EF3V to 1500 from 1300V. Load
Jul 10 2009 01:29:18:330PM	1090710017	Ian Hutchinson	Fizzle. Breakdown at 11ms. Gas current ~10kA. ICEF1s to -6100A ICEF4 to -1370A EF1V to 1800V Load
Jul 10 2009 01:42:33:910PM	1090710018	Ian Hutchinson	Fizzle. Open null. Breakdown at 13ms. Fixed the gradients but not the Bz ramp. ICEF4 to -1410A EF3 raise some more: 2100 max.
Jul 10 2009 01:56:39:487PM	1090710019	Ian Hutchinson	Fizzle. Breakdown at 11ms. Bz is nulled from early. But there's no field ramp. ICEF4 to -1450A EF3 to 2300V at 13-19ms OH2s drop to 100V at 13ms.
Jul 10 2009 02:09:32:127PM	1090710020	Ian Hutchinson	Fizzle. EF3V to 2300V at 5ms. Bring up the voltage quicker.
Jul 10 2009 02:22:41:347PM	1090710021	Ian Hutchinson	Fizzle. Breakdown at 10ms. Lower OH2V 13-25ms to 100/90V. We seem to be getting more voltage than is preprogrammed. I think that must be Rcur.
Jul 10 2009 02:35:49:783PM	1090710022	Ian Hutchinson	Fizzle. Breakdown at 9.7ms. Lower OH2Vs to 80V at 10-15ms. Br offset to 1.5mT from 1mT
Jul 10 2009 02:48:10:813PM	1090710023	Ian Hutchinson	Fizzle. Breakdown at 10ms. OH2s to 70/80V during 10-20ms.
Jul 10 2009 03:02:51:970PM	1090710024	Ian Hutchinson	Fizzle. Bkdwn 11ms. Lower OH1V to 550V from 624 5-15ms.
Jul 10 2009 03:21:09:007PM	1090710025	Ian Hutchinson	Fizzle. Hardly any change. Seems that OH1 is railed. EF3V to 2600 from 2300V. Br offset back to 1mT.
Jul 10 2009 03:26:52:830PM	1090710026	Ian Hutchinson	Fizzle. OH1V to 500V. It's pretty clear that we are needing very different settings to get anything close to the same null. This might be because of different power supply gains or it might be different hardware.
Jul 10 2009 03:39:34:287PM	1090710027	Ian Hutchinson	Fizzle. No visible change. A clear demo that OH1 is railed well above its voltage setting. However, it appears to be PCS demand. Set OH1V to 300V to get a bench mark.
Jul 10 2009 03:51:32:960PM	1090710028	Ian Hutchinson	Fizzle. Fields actually changed this time. Fairly sensible field rise. Much more rapid. Breakdown 11ms. When asking for 300V we get nearly 500V Reduce OH1v second point after t=0. Reduce EF3V at 5ms.
Jul 10 2009 04:08:09:817PM	1090710029	Ian Hutchinson	Dud. I guess we went too far. Move oh1 voltage step 1ms earlier. ICEF4 to -1420A
Jul 10 2009 04:18:54:990PM	1090710030	Ian Hutchinson	Fizzle. 20kA of gas current, then crunched on inboard. OH1V notch to 400 from 300
Jul 10 2009 04:29:43:910PM	1090710031	Ian Hutchinson	Fizzle. Import seg1 from 30 EF3V to 2400 from 2600V at 11-20ms
Jul 10 2009 04:49:50:677PM	1090710032	Ian Hutchinson	Fizzle. Breakdown at 9ms. EF3V 5ms point to 2600V from 2400V.
Jul 10 2009 05:04:47:927PM	1090710033	Ian Hutchinson	Fizzle. ICEF1s to 6000A. EF3V to 2300 at 12ms.
Jul 10 2009 05:05:43:990PM	1090710034	Ian Hutchinson	Fizzle. ICEF1s to 6050 EF3V to 2300 at 19ms.

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	09:12:51:877AM	Plasma	Ok
2	09:29:12:267AM	Plasma	Ok
3	09:41:51:597AM	Plasma	Ok
4	10:02:09:283AM	Plasma	Ok
5	10:16:42:487AM	Plasma	Ok
6	10:29:18:847AM	Plasma	Ok
7	10:44:30:360AM	Plasma	Ok
8	10:59:56:673AM	Plasma	Ok
9	11:14:37:207AM	Plasma	Ok
10	11:28:20:363AM	Plasma	Ok
11	11:40:58:877AM	Plasma	Ok
12	12:01:45:330PM	Plasma	Ok
13	12:14:30:267PM	Plasma	Ok
14	12:28:04:690PM	Plasma	Ok
15	12:42:27:487PM	Plasma	Ok
16	01:01:00:487PM	Plasma	Ok
17	01:14:31:610PM	Plasma	Ok
18	01:27:27:940PM	Plasma	Ok
19	01:40:45:957PM	Plasma	Ok
20	01:54:50:250PM	Plasma	Ok
21	02:07:47:080PM	Plasma	Ok
22	02:20:56:520PM	Plasma	Ok
23	02:33:48:767PM	Plasma	Ok
24	02:46:23:220PM	Plasma	Ok
25	02:59:24:017PM	Plasma	Ok
26	03:11:55:173PM	Plasma	Ok
27	03:25:04:000PM	Plasma	Ok
28	03:37:41:443PM	Plasma	Ok
29	03:51:19:910PM	Plasma	Ok
30	04:04:34:567PM	Plasma	Ok
31	04:17:02:363PM	Plasma	Ok
32	04:31:37:600PM	Plasma	Ok
33	04:44:05:770PM	Plasma	Ok
34	04:56:37:240PM	Plasma	Ok
35	05:10:17:677PM	Plasma	Ok