Miniproposals

Miniproposal: 425 Date Filed: 5/13/2005 Title: Toroidal rotation in dimensionally similar discharges with no momentum input First Author: John Degrassie Session Leader: John Rice (shots 1-34) Session Leader: John Degrassie (shots 1-34)

Engineering Operator Run Comment

MP#425 Torque-free rotation - DIII-D Similarity SL: Degrassie, Rice PO:

Session Leader Plans

Entered: Jul 5 2005 05:35:02:537PM

Author: John Degrassie

SESSION LEADER PLAN 1050706*** MP 415 â??Toroidal rotation in dimensionally similar discharges with no momentum inputâ?? SL: J.S. deGrassie, J.E. Rice The goal is to run C-MOD discharges with dimensionless similarity to discharges run in DIII-D and measure the toroidal rotation velocity, thereby establishing whether non-driven rotation can be described in some way by the dimensionless parameters. These are to be H-mode discharges as much in steady state as possible. The desirability of this experiment was not anticipated when the DIII-D discharges were run, so there is some shape adjustment necessary to come close to the DIII-D shape in C-MOD. 1. We will start by replicating DIII-D 118190.01850 scaled to C-MOD: Bt= 6.0T q95= 4.9, n=3.9^20 (n/nG ~ 0.7) ,T_0= 2.2keV 2. Modify Beta and q95, with product the same as case 1. Bt= 6.0T q95= 7, n=2.7^20 (n/nG ~ 0.6), T_0= 2.2keV 3. Vary Beta from case 1 at same q95. Bt= 5.3T, q95= 4.9, n=2.1^20 (n/nG ~ 0.4), T_0= 1.65keV 4. Vary Collisionality from case 1, at same q95. Bt= 5.3T, q95= 4.9, n=4.1^20 (n/nG ~ 0.8), T_0= 1.45keV 5. Parameters for similar match to DIII-D lower q95 discharge, 111154.02000. Bt= 6.0T, q95= 3.1, n=4.9^20 (n/nG ~ 0.5), T_0= 2.0keV

Physics Operators Plans

Entered: Jul 5 2005 03:24:42:960PM

Author: Steve Wolfe

Physop Plan for Wednesday, 6-July-2005 MP#425 Torque-free rotation - DIII-D Similarity SL: Degrassie, Rice PO: Wolfe Run begins at 09:00 and ends at 17:00 Overnight boronization required before this run PEI settings 44/52/103 (Rmin/Rres/Rmax) followed by 4 hours ECDC in He and 1 hour D2 ECDC. Engineering Setup ------------------ Power systems as on 1050705 EXCEPT: TF current limit to 175kA A-coil in standard configuration (+Dtop -Dbot -Jtop +Jbot) C-coil start=0.3sec, invert=2.0sec All ICRF transmitters in RUN-ON by 8:30 Gas setup: ---------- fill B-top 6psi D2 Hybrid Enabled (PG4) fill B-side lower 1.5psi Argon, Hybrid enabled (PG1) leave B-side upper as is, Hybrid DISABLED fill B-side main 40psi D2, Hybrid Enabled (PG3) Enable ECE, VUV, Z-bolo shutter (assuming no vacuum problems) Run Plan -------- The first several shots will be a combination of boronization recovery and equilibrium development. The target is DIII-D shot 118190 at about 1850msec, with upper and lower triangularity increased somewhat to clear the C-Mod divertor hardware. The parameters of the target are kappa=1.8, delta_u=0.15, delta_l=0.32. We will be starting at a field of 6.0T and aiming for a qpsib=4.9, which is expected to correspond to a current around 900kA. I'll start from the JET-like geometry used on 1050415001 Segment 2 and: Change TF to 6.0 T (166700 A) Change PG1 (Argon puff) to 40msec Change Ip to 0.9 MA (and extend flattop to 1.5sec) Raise ZCUR to 0 Decrease CLEARIN from 0.015 to 0.005 (and extend flattop) Decrease RCUR by .005 Decrease ZXL by .01 (to start) Decrease RXL by .01 Increase RXU by .01 (to start) Leave ZXU unchanged (to start) RF should try for flat waveform from 0.7 to 1.2sec; try for 3.0MW to start, and we will adjust up and down to match target temperature and/or beta. Continue to adjust shape and Ip to match q95=4.9 at B=6.0 The initial density (in H-mode) should be nebar=3.9e20; adjust target density to try to control this. Initial target temperature is 2.2keV (target betat=1.0 to 1.1%); adjust RF power to match. This is condition C2-1 from SL's spreadsheet. Document rotation. C2-2: Reduce current to get q95=7.0 (guess is Ip~650kA) and target density to get nebar=2.7e20. Target temperature for RF is 2.2keV. Document rotation. C2-3: Decrease Bt to 5.3 T, repeat q95=4.9 (estimate Ip~800kA). Target density is 2.1e20 and Te=1.65keV. These conditions may be difficult to achieve in H-mode. If we can get them, document rotation. C2-4: Increase H-mode density to 4.1e20. Adjust RF to get Te=1.67keV, beta back to original value. Document rotation. If there is any time left, we can go back and try to cover the parameters of the lower q, higher current cases based on 111154 (Conditions C1-1 through C1-4 in the spreadsheet).

Session Leader Summaries

Entered: Jul 6 2005 05:37:11:597PM

Author: John Degrassie

Run 1050706 The modified C-Mod shape (to fit more closely DIII-D) was the problem today. (See PhysOp summary.) We readily achieved the targeted similarity density range, but not the temperature range due to lack of coupled RF power. q95 was matched and rho* was close enough (goes as sqrt(T)), but not beta and nu*. However, these 'near DIII-D' cases will give a comparison for a future try with a more standard C-Mod shape to obtain higher RF power. (If only 'we' had anticipated this comparison we would have run the standard C-Mod shape in DIII-D. 20/20 hindsight.) A number of shots today had time slices that were at least in the right ballpark. The targeted values of Beta (nT/B^2) and nu (an/T^2) are 2.4 and 1.7, respectively (Run plan case C2-1). Shot #32 has a time slice at Beta~1.9 and nu~2.6, while shots 23,27 and 29 have a timeslice in the vicinity of Beta~1.8 and nu~2.3. 'Only' and additional 400eV or so was needed. Shots 19, 20, 22, and 25 also have time slices of interest. The toroidal Mach number, M, will be analyzed for these cases. Very preliminary analysis puts the C-Mod M at the same order of magnitude as for the DIII-D target shot.

Physics Operator Summaries

Entered: Jul 6 2005 06:11:56:220PM

Author: Steve Wolfe

Physop summary for 1050706 MP#425 Torque-free rotation DIII-D similarity The goal of this experiment was to match DIII-D non-dimensional parameters from a ECH discharge (118190) which exhibited strong rotation, and compare the normalized rotation velocities. The plan was then to move to different values of q, beta, and nu* and determine the scaling of rotation with those parameters. We were unable to accomplish these goals. The target shape for the DIII-D match was a high elongation (kappa~1.8) low triangularity case. We knew we couldn't match the DIII-D aspect ratio, and would need to compromise on the triangularity because the scaled diii-d shape would have inter- sected the C-Mod outer divertor. The first half of the run was spent trying to get as good a shape and qpsi match as possible at the nomimal scaled field of 6.0T. The estimated current to get the desired q95=4.9 was 900kA, and we ended up finding a satisfactory match at 970kA. An example is shown below Note that this equilibrium is almost touching the outboard limiter near the top, and also is extremely close to the upper surface of the outer divertor. This case is close to being vertically unstable (n/nc~1.15) and we had a few vertical disruption on the way to getting it. Unfortunately, the RF was essentially unable to couple enough power to this shape to achieve the necessary density and temperature. In fact, we had no cases of fault-free rf pulses into this shape, although at lower power we had some shots with only a few trips. The RF group stated that the proximity to the antenna and the asymmetric loading between top and bottom contributed to the faulting problem. It is not believed that this was a conditioning issue. The run was also plagued by disruptions and fizzles. The disruptions were partly due to vertical instability and partly to injections, which may have been related to the shape; certainly we were putting power in unusual places. We didn't get any halo current warnings, unlike the case in the JET locked mode runs. Most of the injection events were identified as Mo. The fizzles were present from the beginning of the day, and were mostly characterized by failure to burn-through as observed on the Dalpha signal, which rose to about twice the normal level and never came down. This phenomenon, which is not typical, seems unrelated to the unusual shape since it appeared already on the first two shots. Adjusting the pre-puff did not cure the problem, and neither did decreasing bz by taking 15Amps off ef4, although the latter may have helped a little. During the run we had both argon (for HIREX) and neon (for NESOX) puffing, the latter through Bside-upper. We also had NINJA on for part of the run, but disabled again at shot#24, because I thought it might have been responsible for some density ramp in H-mode. Neon was turned off at shot#29 because NESOX had been incorrectly tuned and wasn't seeing it anymore. There was no indication either argon or neon were affecting the discharge. Radiated power was not especially low, considering we had just boronized, but it wasn't all that high except for injections, which were frequent. It probably would have been worthwhile to run a fiducial, but we didn't. There were problems in the morning, and continuing through the day, with water in the power room near the FMIT#3 and 4 transmitters, due to the heavy rain. Physical plant is hopefully going to try to deal with this issue during maintenance week next week (weather permitting). Scorecard: ---------- Duds 3 (1 No TF, 1 No EF4, 1 Ack fail on check-> pulse) Fizzles 11 Plasmas 20 ======= == Shots 34

Session Leader Comments
Jul 6 2005 09:04:39:970AM	1050706001	John Rice	fizzle
Jul 6 2005 09:17:25:610AM	1050706002	John Rice	fizzle
Jul 6 2005 09:32:33:737AM	1050706003	John Rice	6 T, 0.9 MA disrupted at 0.6 s
Jul 6 2005 09:47:37:267AM	1050706004	John Rice	fizzle
Jul 6 2005 10:13:05:347AM	1050706006	John Rice	fizzle
Jul 6 2005 10:25:35:953AM	1050706007	John Rice	dud
Jul 6 2005 10:43:05:017AM	1050706008	John Rice	6 T, 0.9 MA H-mode
Jul 6 2005 10:56:59:330AM	1050706009	John Rice	6 T, 0.9 MA L-mode
Jul 6 2005 11:10:58:267AM	1050706010	John Rice	no shot
Jul 6 2005 11:23:57:453AM	1050706011	John Rice	6 T, 0.9 MA H-mode with ELMs
Jul 6 2005 11:37:14:500AM	1050706012	John Rice	fizzle
Jul 6 2005 11:47:59:203AM	1050706013	John Rice	fizzle
Jul 6 2005 12:02:17:940PM	1050706014	John Rice	6 T, 0.9 MA L-mode
Jul 6 2005 12:44:16:313PM	1050706015	John Rice	6 T, 0.9 MA weak H-mode
Jul 6 2005 12:58:51:330PM	1050706016	John Rice	6 T, 0.9 MA H-mode
Jul 6 2005 01:11:33:830PM	1050706017	John Rice	fizzle
Jul 6 2005 01:35:44:453PM	1050706018	John Degrassie	Shot#18: Can see case C2-1 in the distance. Needs more Prf to raise temperature.
Jul 6 2005 01:36:29:330PM	1050706018	John Rice	6 T, 0.9 MA H-mode
Jul 6 2005 01:42:21:003PM	1050706019	John Rice	6 T, 0.9 MA H-mode
Jul 6 2005 01:55:05:953PM	1050706020	John Rice	6 T, 1.0 MA H-mode, disruption
Jul 6 2005 02:07:15:703PM	1050706021	John Rice	fizzle
Jul 6 2005 02:35:51:000PM	1050706022	John Rice	6 T, 1.0 MA H-mode
Jul 6 2005 02:44:00:190PM	1050706023	John Rice	6 T, 1.0 MA H-mode
Jul 6 2005 02:58:06:893PM	1050706024	John Rice	fizzle
Jul 6 2005 03:11:18:550PM	1050706025	John Rice	6 T, 1.0 MA H-mode and disruption
Jul 6 2005 03:21:32:190PM	1050706026	John Rice	6 T, 1.0 MA early disruption
Jul 6 2005 03:37:38:097PM	1050706027	John Rice	6 T, 1.0 MA H-mode
Jul 6 2005 03:48:06:730PM	1050706028	John Rice	dud
Jul 6 2005 04:00:13:080PM	1050706029	John Rice	6 T, 1.0 MA modest H-mode
Jul 6 2005 04:14:04:940PM	1050706030	John Rice	6 T, 1.0 MA modest H-mode
Jul 6 2005 04:23:23:033PM	1050706031	John Rice	fizzle
Jul 6 2005 04:38:19:860PM	1050706032	John Rice	6 T, 1.0 MA H-mode, higher density
Jul 6 2005 04:49:08:050PM	1050706033	John Rice	fizzle
Jul 6 2005 05:05:54:627PM	1050706034	John Rice	6 T, 1.0 MA short H-mode

Physics Operator Comments
Jul 6 2005 07:35:13:597AM		Steve Wolfe	Setting up for DIII-D Similarity run Load from 1050415001 In seg2: All_V: TF_CURRENT to -166700 PG1 to 40msec (from 50) Acoil_CUR start at 0.4sec, end at 1.6sec, 2500A All_P: Zcur from -0.015 to 0.000 Clearin from .015 to .005 RCUR in by .005 RXL from .025 to .015 (may move this back out later) ZXL from [-.005,-.010] to [-.015,-.02] RXU from -.02 to -.01 ZXU unchanged Ip from -810e3 to -900e3 Import seg1 from 1050525002 reduce pg4 from 21ms to 19ms Load at 6-Jul-2005 07:17:29.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done
Jul 6 2005 09:07:48:923AM	1050706001	Steve Wolfe	Shot#1: First go at matching DIII-D low triangularity shape fizzle. Looks like too much gas/slow current rise; never burns out. Fields and current look ok, drop pg4 some more.
Jul 6 2005 09:20:54:127AM	1050706002	Steve Wolfe	Shot#2: pg4 from 19ms to 17ms; first one didn't really look like low pressure at breakdown, it just evolved a lot of gas thereafter. Don't want to drop it too much or I risk a dud. Another fizzle. Still not burning out; maybe a little better than last time, but still a lot of gas coming in. I've got the post-boronization blues. next shot: reduce pg4 and delay pg3 in seg1
Jul 6 2005 09:42:04:097AM	1050706003	Steve Wolfe	Shot#3: pg4 from 17ms to 15ms;delay pg3 to 33ms in seg1 Very late breakdown 10msec. Early disruption .58sec; looks like a vertical upward going disruption. There's a datasystem problem, so I haven't got a lot of traces to go by. EFIT has come through, n/ncrit is big and it's going vertically unstable. Gaps look big on both sides. Kappa is over 1.8 at the end. next shot: clearin to -.005
Jul 6 2005 09:56:01:813AM	1050706004	Steve Wolfe	Shot#4: clearin to -.005 from +.005 fizzle. breakdown time back to 5.1ms Should have dropped the gas This one almost made it. Next one should go.
Jul 6 2005 10:07:25:627AM	1050706005	Steve Wolfe	Shot#5: clearin to -.005 from +.005 Also increase ZXU from .04 to .045 Plasma full length. Shape is not very close, but it's a start. kappa=1.75, du=.3 to .4, dl=.42 qpsib=5.0 at 900ka next shot: RXU from -.01 to +.01
Jul 6 2005 10:14:30:283AM	1050706006	Steve Wolfe	Shot#6: RXU from -.01 to +.01 fizzle. Still having burnout problems. Drop pg4 again
Jul 6 2005 10:27:46:517AM	1050706007	Steve Wolfe	Shot#7: pg4 from 15 to 14msec; RCUR offset from 1500 to 1200 (so much for Ian's robust startup) RXU from -.01 to +.01 dud. No EF4 - That one wasn't my fault, anyway.
Jul 6 2005 10:47:03:203AM	1050706008	Steve Wolfe	Shot#8: pg4 at 14msec; RCUR offset at 1200 RXU at +.01, while I'm waiting move ZXU up another 5mm to .05 plasma full length (finally!) H-mode at .77sec, shape is getting closer J-port is still faulting, E is up to 1MW through 1sec JR request 10ms more on Argon Next shot: move zxl down 1cm, RXU out 1cm, ZXU ramp up
Jul 6 2005 11:03:01:110AM	1050706009	Steve Wolfe	Shot#9: PG1 from 40ms to 50ms RXU from .01 to .02; ZXL from [-.015,-.02] to [-.02,-.03] ZXU ramp to .06 No startup changes, it looked pretty fast on #8 Plasma disrupted in rampdown. No H-mode. Looks like we're getting vertically unstable. kappa=1.8 I can stand to move ZXU up some more, ssep is getting small.
Jul 6 2005 11:11:09:907AM	1050706010	Steve Wolfe	Shot#10: ZXU up another 1cm, ends at .07 chopper voltage from 100 to 0 in seg2 No pulse. Ack failure on PLC to CAMAC communication. next shot: repeat.
Jul 6 2005 11:27:00:597AM	1050706011	Steve Wolfe	Shot#11: ZXU up another 1cm (from 9), ends at .07 chopper voltage from 100 to 0 in seg2 Extend current flattop from 1.4 to 1.5sec plasma full length, H-mode Has a burst of vertical instability late, but survived Still a little high at the top, could stand to lower the xpint a smidge. Still not getting much from J-port. John wants more Argon. Move ZXU up another cm and ZXL down 5mm
Jul 6 2005 11:35:56:737AM	1050706012	Steve Wolfe	Shot#12: ZXU up another 1cm, ends at .08 ZXL down 5mm ends at -.035 Argon puff to 60msec fizzle, choked. next shot: repeat
Jul 6 2005 11:54:19:157AM	1050706013	Steve Wolfe	Shot#13: ZXU up another 1cm (from #11), ends at .08 ZXL down 5mm ends at -.035 Argon puff to 60msec Another fizzle? What is the problem? Late breakdown (7ms), still not burning out on Dalpha pressure is down to .025mTorr, Br0 drifting down, Bz a little up next shot: put rcur offset back to 1500; Br0 to .0002
Jul 6 2005 12:08:57:050PM	1050706014	Steve Wolfe	Shot#14: ZXU up another 1cm (from #11), ends at .08 ZXL down 5mm ends at -.035 Argon puff to 60msec put rcur offset back to 1500 (?); Br0 to .0002 plasma full length. No h-mode. Another late breakdown though Shape looks pretty close. kappa=1.81, utri=0.18,ltri=.4 to .3 Yijun thinks we're too close at the top of the antenna. TS guys will adjust edge locations. Next shot: move rcur in by 3mm
Jul 6 2005 12:40:21:360PM	1050706014	Steve Wolfe	For shot#15:move rcur in by 3mm at eof (.6575 to .6545) Increase Ip from 900 to 930kA to match q95=4.9 There was a big Br0 excursion after 12msec on shot 14? Put Br0 back to 0, drop ef4 from -1310 to -1325 There will be a delay for bailing out the RF transmitter area. While we're waiting, Tommy has installed the Neon on the gas system for Alex and JR; fill B-side upper to 1psi Neon The shot#14 equilibrium is almost touching at the top of the outboard limiter and the nose of the outer divertor. I've moved the outer gap in, but I may need to back off on RXU and RXL as well. Yijun is blaming the closeness to the antenna for the RF problems (faulting, not flooding).
Jul 6 2005 12:50:38:657PM	1050706015	Steve Wolfe	Shot#15:move rcur in by 3mm at eof (.6575 to .6545) Increase Ip from 900 to 930kA to match q95=4.9 There was a big Br0 excursion after 12msec on shot 14? Put Br0 back to 0, drop ef4 from -1310 to -1325 Also, Tommy has closed the B injector gate valve; Jim saw some boron coming into the plasma on previous shot. Plasma disrupted at 1.28sec, had an injection during current rise too. This one had a bouncy startup and runaways. N/Ncrit is up close to 1.2, looks like a possible vertical instability. RF still faulting. Still almost touching at top of outboard limiter, I'm going to need to move it over a little.
Jul 6 2005 01:04:37:707PM	1050706016	Steve Wolfe	Shot#16: ZXU to .08; RXU from .02 to .015 Plasma disrupts at 1.52sec. Still vertically unstable at the end of flattop. It's ok through Little H-mode, RF still having trouble q95 is still a little high; increase ip to 950kA, ramp ZXU from .08 to .09
Jul 6 2005 01:12:43:517PM	1050706017	Steve Wolfe	Shot#17: increase ip to 950kA, ramp ZXU from .08 to .09 fizzle. Two bounces, didn't survive the second next: raise pg4 2ms!
Jul 6 2005 01:28:31:800PM	1050706018	Steve Wolfe	Shot#18: pg4 from 14->16ms ip to 950kA, ramp ZXU from .08 to .09 Enable B-side upper (30ms Ne pulse at .3sec for NESOX) Plasma disrupts at 1.52, same as last time. I can ramp ZXL back up after the RF to fix that, I think RF is better on this one next: add 10ms to neon puff; modify zxl
Jul 6 2005 01:47:24:157PM	1050706019	Steve Wolfe	Shot#19: PG2 to 40ms Program zxl=-.033 at 1.3sec, -.025 at 1.5sec rxl to .005 at 1.5sec (from .015) plasma full length. Bouncy startup, some early runaways. No vertical problem late this time. 2.5MW with some faulting. next: raise ip to 970kA to get down to q=4.9 RF will try to square up pulse, add a little power
Jul 6 2005 01:59:38:080PM	1050706020	Steve Wolfe	Shot#20: raise ip to 970kA to get down to q=4.9 RF will try to square up pulse, add a little power Plasma disrupts at .95sec, looks like an injection Startup still bouncy, not as bad as 19. RF added D this time, very choppy. next shot: repeat, hope it doesn't disrupt.
Jul 6 2005 02:08:07:720PM	1050706021	Steve Wolfe	Shot#21: No changes fizzle. Initial rise ok, then chokes. Cell access for DNB, NESOX; Power room for RF. next: no changes
Jul 6 2005 02:39:25:580PM	1050706022	Steve Wolfe	Shot#22: No changes plasma full length, h-mode seems flickery on tv RF around 2.7MW, only a few faults (except for D) Need more power to get the temperature up to 2.2keV target density seems about right, but takes a long time to get there. next shot: no changes, rf will try harder
Jul 6 2005 02:46:03:627PM	1050706023	Steve Wolfe	Shot#23: No changes plasma full length Drops out of hmode at 1sec, then back in. next shot: disable NINJA, see if it's causing the density rise in the H-mode phase
Jul 6 2005 03:02:57:923PM	1050706024	Steve Wolfe	Shot#24: No changes, except disable NINJA RF turning D off, raising power early on E and J fizzle. Br trace looks very strange. Dalpha still looks like its choking on gas. next shot: repeat
Jul 6 2005 03:14:33:970PM	1050706025	Steve Wolfe	Shot#25: repeat plasma disrupts at .95sec. Looks like a Mo injection? bouncy startup, some runaways. Got to 3.2MW for a little while. Te gets above 2keV for a short while; that one was getting close until it got killed. next shot: PG1 (Argon) from 60->50ms
Jul 6 2005 03:25:41:627PM	1050706026	Steve Wolfe	Shot#26: PG1 (Argon) from 60->50ms (per JR's request) Another early disruption, .69sec, before the RF? Startup looked better, one bounce but no runaways. Looks like another injection, but I'm going to back off on the acoil anyway; it's overdriving for these parameters Also, try raising the target density a little
Jul 6 2005 03:42:50:910PM	1050706027	Steve Wolfe	Shot#27: Acoil changed from 2500 flat to [500,1500] nl04 from 1.0e20 to 1.2e20 Another disruption, later this time 1.1sec, in trouble at 1.0 RF on and off, and so are the Hmodes. John says it's a Mo injection before the disruption. Plasma is bouncing on the top of the divertor at every RF fault. Next shot: Increase D gain on RCUR from 6 to 9.9 after .65sec
Jul 6 2005 03:49:24:057PM	1050706028	Steve Wolfe	Shot#28: Increase D gain on RCUR from 6 to 9.9 after .65sec RF is going to back the power down a little dud - No TF Chopper looks funny, but it's probably a feedback effect? next: no changes, try again
Jul 6 2005 04:04:32:893PM	1050706029	Steve Wolfe	Shot#29: Increase D gain on RCUR from 6 to 9.9 after .65sec RF raised power Turn off neon puff from b-side upper plasma full length, early runaways. RF faulting more frequently, peak is 3.4MW but it is more off than on. Still getting big fast excursions in the rcur; the extra derivative gain doesn't seem to help much. next shot: back off on power, and increase outer gap by 2mm
Jul 6 2005 04:16:39:207PM	1050706030	Steve Wolfe	Shot#30: increase outer gap by 2mm (Rcur down by 1mm) increase pg4 by 2ms to 18msec (last one bounced) rf dropping power to try to keep it on steady plasma full length, still multiple hmodes Still early runaways and a bouncy startup. On and off, 3MW. Density and temperature still too low. Try raising the target to 1.3, puffing into the hmode
Jul 6 2005 04:26:21:003PM	1050706031	Steve Wolfe	Shot#31: Increase target to nl04=1.3e20, program 2.2e20 during RF pulse fizzle. Dalpha stays high again. I don't understand this effect. It looks like something comes in at about 8-10msec just as it would normally burn through, and doubles the dalpha signal. No idea what to do about it, so just repeat.
Jul 6 2005 04:42:35:767PM	1050706032	Steve Wolfe	Shot#32: target at 1.3e20, h-mode density program=2.4e20 *which should give 3.9e20 nebar* plasma full length. Runaways are back. Bounces again. Got the density, actually a little too high but temperature is much too low. RF stays on for awhile at 3MW then loses it. next: drop nl04 demand in hmode to 2.2e20
Jul 6 2005 04:51:01:753PM	1050706033	Steve Wolfe	Shot#33: drop nl04 demand in hmode to 2.2e20 fizzle.
Jul 6 2005 05:08:53:957PM	1050706034	Steve Wolfe	Shot#34: nl04 demand in hmode at 2.2e20 @0.9sec pg4 from 18 to 16msec plasma disrupted at 1.36sec (after the RF) bounces on startup, some runaways but not bad. One short hmode. Peak rf power 2.6MW and faulting away. Not close to what we want.

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	09:03:10:657AM	Plasma	Ok
2	09:15:53:890AM	Plasma	Ok
3	09:28:47:390AM	Plasma	Ok
4	09:46:05:640AM	Plasma	Ok
5	09:58:29:080AM	Plasma	Ok
6	10:11:42:487AM	Plasma	Ok
7	10:24:14:970AM	Plasma	Ok
8	10:38:30:063AM	Plasma	Ok
9	10:53:58:377AM	Plasma	Ok
10	11:08:37:487AM	Plasma	Bad	Ack failure Igor
11	11:18:41:783AM	Plasma	Ok
12	11:32:03:673AM	Plasma	Ok
13	11:44:31:750AM	Plasma	Ok
14	11:57:07:640AM	Plasma	Ok
15	12:41:08:313PM	Plasma	Ok
16	12:55:47:737PM	Plasma	Ok
17	01:09:42:703PM	Plasma	Ok
18	01:22:18:313PM	Plasma	Ok
19	01:37:56:283PM	Plasma	Ok
20	01:51:22:080PM	Plasma	Ok
21	02:04:11:847PM	Plasma	Ok
22	02:28:08:627PM	Plasma	Ok
23	02:40:47:440PM	Plasma	Ok
24	02:53:40:550PM	Plasma	Ok
25	03:06:20:487PM	Plasma	Ok
26	03:19:16:390PM	Plasma	Ok
27	03:31:52:390PM	Plasma	Ok
28	03:45:51:143PM	Plasma	Bad	TF not fire
29	03:56:30:160PM	Plasma	Ok
30	04:09:11:893PM	Plasma	Ok
31	04:21:54:550PM	Plasma	Ok
32	04:34:25:813PM	Plasma	Ok
33	04:47:28:673PM	Plasma	Ok
34	05:00:09:503PM	Plasma	Ok