Miniproposals

Miniproposal: 317 Date Filed: 8/21/2002 Title: ITB Study with Expanded Diagnostic Set First Author: Catherine Fiore Session Leader: Catherine Fiore (shots 1-28)

Engineering Operator Run Comment

MP #317 ITB Studieswith improved diagnostics. Fiore/Wolfe/Cochran

Session Leader Plans

Physics Operators Plans

Session Leader Summaries

Entered: Jul 7 2004 03:49:31:320PM

Author: To Be Determined

This run is in support of MP#317, ITB with improved diagnostics. The purpose of this experiment is to reproduce the off-axis ITB studies from 2001 described in MP269, MP289a,and MP291a with the expanded diagnostic set which is now available. The goal is to obtain detailed density profiles from visible bremsstrahlung and Thomson scattering, detailed temperature measurements from Thomson scattering, ECE, HIREX, and CX (if available) diagnostics, and improved plasma rotation data for input into TRANSP and GS2 or other gyrokinetic codes. This proposal calls for obtaining EDA H-mode plasmas at a series of magnetic fields, suitable for obtaining both high and low field ITBs. We will begin with a shot from August 20th (5) where we obtained an ITB using 70 MHz off axis on the low field side. Overall the run was successful, with a number of shots having ITBs. We should have good temperature profiles from ECE, Thomson and HIREX for these shots. The operating space for obtaining these appears to be quite narrow, however. The ITB density from the visible bremsstrahlung profiles were noticeably narrower than in the high field side cases measured earlier. We were not able to obtain ITBs at Bfields lower than 5.5 T, even though we tried to lower it in increments as low as .05 T. We had more success at higher field, but were probably limited by having the resonance too close to the antenna at 5.7 T. Attempts to tune in the ITB at 5.45 T were unsuccessful, so we returned to 5.5 T just in time to lose the J4 rf power system, leading to early termination of the run. ---------------- Shot summary ---------------------------------------------------------------------------- 1021011001 5.5T J-port RF power is being brought up slowly and is still at low power (also J4 was apparently not turned on.) The plasma went into H-mode when D and E fired late in the shot. Good first shot. ----------------------------------------------------------------------------- 1021011002 5.5T Good H-mode, but starts late. It goes into an ITB late as well. No Thomson data was available on this shot, however. ----------------------------------------------------------------------------- 1021011003 5.5T Two H-modes, but starts late. It goes into an ITB late as well. Thomson data has returned. Density starts to peak on 2nd H-mode. ----------------------------------------------------------------------------- 1021011004 5.5T Good H-mode, starting somewhat later. A strong ITB develops after 1.28 ms. ----------------------------------------------------------------------------- 1021011005 5.5T Two good H-modes. A strong ITB develops after 1.2 ms. Hirex had Camac errors. ---------------------------------------------------------------------------- 1021011006 5.5T Two good H-modes, with an ITB on the first one which ends when the H-mode drops out. HIREX is back on. We will try to repeat the shot for them before changing field. ----------------------------------------------------------------------------- 1021011007 5.5T Three H-modes. Density remains peaked through the H-mode drop outs. We wil try lowering the RF power to see if we can steady the H-mode. ----------------------------------------------------------------------------- 1021011008 5.5T Two H-modes. Density remains peaked through the H-mode drop out. We will next add central RF to try and heat and control the density rise. ----------------------------------------------------------------------------- 1021011009 5.5T Two H-modes, although the first one started later. The 2nd rf pulse came in just after the start of the first H-mode, and the density peaked somewhat anyway. It did not maintain the peaking through the H-mode drop out, however. We will repeat the shot in the hopes that the first H-mode will start earlier, as it had done on previous shots. ----------------------------------------------------------------------------- 1021011011 5.5T Two H-modes, with an ITB forming on the first pulse. The peaking is halted by the 80 Mhz rf pulse at 1.1s, and no further peaking appeared in the 2nd H-mode. We will increment the toroidal field up by 0.1 T and delay the 2nd RF pulse to 1.3 s. ----------------------------------------------------------------------------- 1021011012 5.6T Two H-modes, with an ITB forming on the first pulse. The peaking is halted when the plasma drops out of H-mode, and is not recovered on the second H-mode. ---------------------------------------------------------------------------- 1021011013 5.6 T Two H-modes, with an ITB forming on the first pulse and continuing into the 2nd. ---------------------------------------------------------------------------- 1021011014 5.7 T Three H-modes, No obvious ITB ----------------------------------------------------------------------------- 1021011015 5.7 T Three H-modes, No obvious ITB, just like shot 14. ----------------------------------------------------------------------------- 1021011016 5.4 T Three H-modes, no ITBs. ----------------------------------------------------------------------------- 1021011017 5.4 T Two H-modes, no ITBs. ----------------------------------------------------------------------------- 1021011018 5.5 T One H-mode, ITB returns. ----------------------------------------------------------------------------- 1021011019 5.45 T Several H-modes, no good ITB . ----------------------------------------------------------------------------- 1021011020 5.45 T Three H-modes, no good ITB . - ---------------------------------------------------------------------------- 1021011021 5.45 T Two H-modes with a later start time, no good ITB . The target density was higher. It will be lowered on the next shot. ----------------------------------------------------------------------------- 1021011022 Fizzle ----------------------------------------------------------------------------- 1021011023 5.45 T Good shot, earlier H-mode. Target density was lower. No ITB. ---------------------------------------------------------------------------- 1021011024 5.5 T Good shot, three H-modes. No ITB even though the last H-mode was long enough to support it. ----------------------------------------------------------------------------- 1021011025 5.5 T L mode until quite late. No ITB 5.5 T ----------------------------------------------------------------------------- 1021011026 fizzle ---------------------------------------------------------------------------- 1021011027 5.5 T J4 did not fire, and we didn't get into H-mode until D port came on late. ---------------------------------------------------------------------------- 1021011028 5.5 T J4 did not fire, and we didn't get into H-mode until D port came on late.

Physics Operator Summaries

Entered: Jul 7 2004 04:37:16:537PM

Author: To Be Determined

Physop Summary for Friday, Oct 11, 2002 MP#317 ITB Studies with Improved Diag. Set (low-field resonance) SL: Fiore PO: Wolfe EO: Cochran,Fitzgerald,Parkin The run plan is to start with a shot like 1020820005, 800kA, 5.4T,nl4=8e19, 70MHz and obtain good ITB discharges to document with all available diagnostics. Fine scans of Bt and perhaps Ip will be carried out to determine effect on ITB formation and location. J-port may be limited to P70 < 1.5MW, which may be problematic. An earlier example of low-field-side ITB in this power range is 1010801025. The main difference in equilibrium is ZXU was 1.8cm higher in that shot than for the more recent case, so that would be the first thing to try. If ITB's cannot be reliably obtained with J-port, then we will raise the field to ~6.3T and use D+E at 80MHz to heat on the low-field side. Setup: ------ Power Systems as on 1020820005 Overnight ECDC in D2 at 2e-4 torr off by 7:00AM Gas setup: B-Top 6 psi D2 Hybrid Enabled (PG4) B-side lower 1 psi Ar Hybrid Enabled (PG1) B-side upper 10 psi D2 Hybrid DISABLED (PG2, for ECDC) C-Side 30 psi D2 Hybrid Enabled (PG3) J-Bottom as is, Hybrid DISABLED Enable the following gate valves, assuming no vacuum problems: ECE,VUV,DNB RF Setup: #1,2,3,4 in Run On by 7:00AM PCS loaded seg2 from 1020820005; removed TF waggles and added a maintenance waveform on PG3. Start with seg1 from last shot of yesterday (1021010031) with ICEF4 changed from -1325 to -1315. PG4 left at 26msec, Br0 .0015. ------------------- Results: The run got off to a good start. J-port quickly came up to 1.6MW with few faults. ITB's were obtained at the starting field of 5.5T (153kA, PCS setting), apparently cutting off the central ECE signal, although the Te was dropping over the whole profile, and may have actually been getting hollow. We then addded central power from D (80.5MHz) and got some heating inside the barrier. A field scan indicated the effect is incredibly sensitive to B, with a lower bound between 5.45 and 5.5, and an upper bound between 5.6 and 5.7. Shot 17 was a repeat at 5.5T, confirming that the ITB was still present at that field. At the higher fields we may have been having problems because the resonance was close to or inside the antenna box at the top and bottom. Raising the density to 9e19 at 5.45T gave a later H-mode, but no ITB as the H/L transition came too soon. Lowering to 7e19 gave ELM-free hmodes, and no ITB. Returning to 5.5T at 7e19 also gave ELM-free hmode, with no ITB apparent, and 9e19 stayed in L-mode until after 1sec; Wukitch reported that the higher density gave a large change in tune. We then returned to the original condition (5.5T, 8e19) for shot 26, which fizzled, and shot 27, which had an RF problem (J4 screen supply). Fuses were replaced, but J4 still failed on shot #28, and subsequently on a test shot into dummy load. Since there was no time to find and fix the problem or to begin a new sequence of experiments with D&E, the run was terminated at 16:45. Startup was quite reliable today; only two fizzles out of 28 shots. There were no disruptions (sorry Bob). All engineering systems ran without problems, as did data acquisition and computers. DNB ran most of the day, and Bill has hopes of extracting CXRS profiles. Scorecard ---------- Tests 0 Duds 0 Fizzles 2 Plasmas 26 ------ -- shots 28

Session Leader Comments
Oct 11 2002 08:34:46:190AM		Catherine Fiore	This run is in support of MP#317, ITB with improved diagnostics. The purpose of this experiment is to reproduce the off-axis ITB studies from 2001 described in MP269, MP289a,and MP291a with the expanded diagnostic set which is now available. The goal is to obtain detailed density profiles from visible bremsstrahlung and Thomson scattering, detailed temperature measurements from Thomson scattering, ECE, HIREX, and CX (if available) diagnostics, and improved plasma rotation data for input into TRANSP and GS2 or other gyrokinetic codes. This proposal calls for obtaining EDA H-mode plasmas at a series of magnetic fields, suitable for obtaining both high and low field ITBs. We will begin with a shot from August 20th (5) where we obtained an ITB using 70 MHz off axis on the low field side.
Oct 11 2002 09:14:03:860AM	1021011001	Catherine Fiore	J-port RF power is being brought up slowly and is still at low power (also J4 was apparently not turned on.) The plasma went into H-mode when D and E fired late in the shot. Good first shot.
Oct 11 2002 09:31:06:440AM	1021011002	Catherine Fiore	Good H-mode, but starts late. It goes into an ITB late as well. No Thomson data was available on this shot, however.
Oct 11 2002 09:44:53:590AM	1021011003	Catherine Fiore	Two H-modes, but starts late. It goes into an ITB late as well. Thomson data has returned. Density starts to peak on 2nd H-mode.
Oct 11 2002 10:00:45:153AM	1021011004	Catherine Fiore	Good H-mode, starting somewhat later. A strong ITB develops after 1.28 ms. We are adding a little more argon for HIREX
Oct 11 2002 10:15:16:383AM	1021011005	Catherine Fiore	Two good H-modes. A strong ITB develops after 1.2 ms. Cell entry requested for HIREX to improve RF shielding. Also HIREX camac errors appeared.
Oct 11 2002 10:32:26:497AM	1021011006	Catherine Fiore	Two good H-modes, with an ITB on the first one which ends when the H-mode drops out. HIREX is back on. We will try to get a repeat for them before changing field.
Oct 11 2002 10:48:08:853AM	1021011007	Catherine Fiore	Three H-modes. Density remains peaked through the H-mode drop outs. We wil try lowering the RF power to see if we can steady the H-mode.
Oct 11 2002 10:56:55:103AM	1021011008	Catherine Fiore	Two H-modes. Density remains peaked through the H-mode drop out. We will next add central RF to try and heat and control the density rise.
Oct 11 2002 11:12:26:510AM	1021011009	Catherine Fiore	Two H-modes, although the first one started later. The 2nd rf pulse came in just after the start of the first H-mode, and the density peaked somewhat anyway. It did not maintain the peaking through the H-mode drop out, however. We will repeat the shot in the hopes that the first H-mode will start earlier, as it had done on previous shots.
Oct 11 2002 11:29:14:057AM	1021011010	Catherine Fiore	Two H-modes, with an ITB forming on the first pulse. The peaking is halted by the 80 Mhz rf pulse at 1 s, and no further peaking appeared in the 2nd H-mode. We will delay the 2nd rf pulse until 1.1 s.
Oct 11 2002 11:41:38:887AM	1021011011	Catherine Fiore	Two H-modes, with an ITB forming on the first pulse. The peaking is halted by the 80 Mhz rf pulse at 1.1s, and no further peaking appeared in the 2nd H-mode. We will increment the toroidal field up by 0.1 T and delay the 2nd RF pulse to 1.3 s.
Oct 11 2002 11:52:52:077AM	1021011012	Catherine Fiore	Two H-modes, with an ITB forming on the first pulse. The peaking is halted when the plasma drops out of H-mode, and is not recovered on the second H-mode. We will repeat this shot.
Oct 11 2002 12:11:33:880PM	1021011013	Catherine Fiore	Two H-modes, with an ITB forming on the first pulse and continuing into the 2nd. We will increase by another 0.1 T.
Oct 11 2002 12:21:44:630PM	1021011014	Catherine Fiore	Three H-modes, No obvious ITB We will repeat to check for consistency.
Oct 11 2002 12:38:45:397PM	1021011015	Catherine Fiore	Three H-modes, No obvious ITB, just like shot 14. We will drop the field to 5.4T.
Oct 11 2002 12:53:42:910PM	1021011016	Catherine Fiore	Three H-modes, no ITBs.
Oct 11 2002 01:06:50:647PM	1021011017	Catherine Fiore	Two H-modes, no ITBs. Go back to 5.5 T
Oct 11 2002 01:15:59:257PM	1021011018	Catherine Fiore	One H-mode, ITB returns. Try 5.45 T
Oct 11 2002 01:27:44:350PM	1021011019	Catherine Fiore	Several H-modes, no good ITB . Repeat for consistency
Oct 11 2002 01:43:11:670PM	1021011020	Catherine Fiore	Three H-modes, no good ITB . Try to adjust the target density
Oct 11 2002 01:56:35:250PM	1021011021	Catherine Fiore	Two H-modes with a later start time, no good ITB . The target density was higher. It will be lowered on the next shot.
Oct 11 2002 02:04:46:450PM	1021011022	Catherine Fiore	Fizzle
Oct 11 2002 02:26:09:790PM	1021011023	Catherine Fiore	Good shot, earlier H-mode. No ITB.
Oct 11 2002 02:40:45:237PM	1021011024	Catherine Fiore	Good shot, three H-modes. No ITB even though the last H-mode was long enough to support it. Back at 5.5 T
Oct 11 2002 02:47:24:527PM	1021011025	Catherine Fiore	L mode until quite late. No ITB 5.5 T
Oct 11 2002 02:59:14:480PM	1021011026	Catherine Fiore	fizzle
Oct 11 2002 03:14:52:270PM	1021011027	Catherine Fiore	J4 did not fire, and we didn't get into H-mode until D port came on late.
Oct 11 2002 04:26:42:910PM	1021011028	Catherine Fiore	J4 did not fire, and we didn't get into H-mode until D port came on late.

Physics Operator Comments
Oct 11 2002 07:12:45:160AM		Steve Wolfe	Setting up for 1021011 Run Import seg2 from 1020820005 Eliminate tf waggles around .5 and 1.25 sec, leaving a flat 153kA waveform after .15sec Copy over a pg3 waveform (use the one in seq 4) In seg 1, change ICEF4 from -1325 to -1315, leave Br0 at .0015, leave PG4 at 26msec Load it.
Oct 11 2002 09:12:44:343AM	1021011001	Steve Wolfe	Shot#1: plasma, bouncy startup. Hmode at 1.3sec fomr D&E J3 has 350kW, J4 has nohing?????? next shot: turn off D&E,raise pre-puff to 27msec
Oct 11 2002 09:27:13:183AM	1021011002	Steve Wolfe	Shot#2: turn off D&E,raise pre-puff to 27msec Steve found the Kalmus for j4 was off on shot 1 and turned it on for shot#2. plasma, hmode at 1.1sec, jport at 1.2MW, possible ITB at 1.39sec next shot: repeat with more power
Oct 11 2002 09:44:55:980AM	1021011003	Steve Wolfe	Shot#3: repeat with more power plasma-hmode starts at .87, 2nd at 1.21 RF gets 1.6MW next shot: repeat, see if it will stay in H-mode.
Oct 11 2002 09:55:24:847AM	1021011004	Steve Wolfe	Shot#4: repeat, see if it will stay in H-mode. plasma - hmode at 0.92, seems to last this time. ECE is going into cutoff after 1.3 This looks like a good one. next shot: raise the Argon puff for Hirex
Oct 11 2002 10:10:33:220AM	1021011005	Steve Wolfe	Shot#5: Argon puff from 30->40msec plasma- looks like 2 hmodes, second one long second one looks like good ITB. breakdown is getting a little later 6.9msec; leave it for now
Oct 11 2002 10:29:11:223AM	1021011006	Steve Wolfe	Shot#6: repeat hmode starts at .83, H-L at 1.3 next shot: repeat one more for JR
Oct 11 2002 10:44:21:220AM	1021011007	Steve Wolfe	Shot#7:repeat one more for JR plasma, 3 hmodes. next shot: drop power to 1.5MW
Oct 11 2002 10:52:46:173AM	1021011008	Steve Wolfe	Shot#8: drop power to 1.5MW plasma - 2 Hmodes both have ITB's next shot: put some power on axis.
Oct 11 2002 11:10:36:710AM	1021011009	Steve Wolfe	Shot#9: put some power on axis. request 80MHz at 600kW at 1.0sec plasma; hmode from .85 to 1.25, again from 1.3 to 1.5 D stayed on fine. More peaking in first hmode than in second. next shot: repeat
Oct 11 2002 11:23:32:110AM	1021011010	Steve Wolfe	Shot#10: repeat plasma, hmode starts earlier, .76, seems to clamp and heat after 1sec next shot: delay D until 1.1sec
Oct 11 2002 11:34:03:613AM	1021011011	Steve Wolfe	Shot#11: delay D until 1.1sec plasma, hmode starts at .83, next shot: raise field by .1T, delay RF another 100msec
Oct 11 2002 11:52:38:607AM	1021011012	Steve Wolfe	Shot#12: raise Itf from 153 to 155.8kA , delay RF another 200msec to 1.3 plasma, hmode starts at .88, H/L at 1.14, 2nd hmode at 1.19 70MHz resonance looks like it is just in front of the limiter corners next shot: repeat, see if H-mode comes on a bit earlier.
Oct 11 2002 12:05:43:083PM	1021011013	Steve Wolfe	Shot#13: repeat, see if H-mode comes on a bit earlier. plasma - hmode at .74sec, H/L at 1.02, second Hmode shortly thereafter. next shot:raise Bt another 0.1T
Oct 11 2002 12:20:45:613PM	1021011014	Steve Wolfe	Shot#14:TF current to 158600A. plasma - three hmodes, not enough time for any to develop ITB's some early hard xrays, bouncy startup, but it survived. next shot: repeat, see if it gets better
Oct 11 2002 12:30:42:520PM	1021011015	Steve Wolfe	Shot#15: repeat plasma - hmode started a little earlier.75, saw sparks from J antenna. Still 3 hmodes. next shot: drop tf to 5.4T
Oct 11 2002 12:52:31:193PM	1021011016	Steve Wolfe	Shot#16: Itf to 150.2KA plasma, three hmodes again. next shot: try again
Oct 11 2002 01:01:13:443PM	1021011017	Steve Wolfe	Shot#17: repeat plasma, 2 hmodes still not good ITB's next shot: go back to 5.5T and see if we can repeat earlier shots
Oct 11 2002 01:14:11:943PM	1021011018	Steve Wolfe	Shot#18: go back to 5.5T and see if we can repeat earlier shots Longer hmode, but lots of jumpiness. Got the ITB back! This is incredibly narrow range. next shot: 5.45T
Oct 11 2002 01:26:38:677PM	1021011019	Steve Wolfe	Shot#19: Itf to 151600A. 3 hmodes again, second fairly long, but no ITB next shot: repeat
Oct 11 2002 01:37:09:453PM	1021011020	Steve Wolfe	Shot#20: repeat plasma, 3 hmodes. next shot: raise nl4 by 1e19
Oct 11 2002 01:52:48:873PM	1021011021	Steve Wolfe	Shot#21: raise nl4 fr0m 8e19->9e19 Hmode starts late, 1.0sec, no ITB next shot: 7e19
Oct 11 2002 02:04:37:840PM	1021011022	Steve Wolfe	Shot#22: nl4 to 7e19 fizzle, first one all day. next shot: raise the pre-puff by 2msec
Oct 11 2002 02:20:35:773PM	1021011023	Steve Wolfe	Shot#23: nl4 to 7e19, raise the pre-puff 27->29msec plasma, bounced again but made it. At least 2 Hmodes. next shot: back to 5.5T, leave nl4 at 7e19
Oct 11 2002 02:32:32:397PM	1021011024	Steve Wolfe	Shot#24: back to 5.5T, leave nl4 at 7e19 plasma, multiple hmodes, no ITB next shot: 9e19
Oct 11 2002 02:45:07:340PM	1021011025	Steve Wolfe	Shot#25: nl4 to 9e19, still at 5.5T; raise pre-puff to 30msec hmode at 1.23 sec. next shot: back to 8e19
Oct 11 2002 03:01:59:970PM	1021011026	Steve Wolfe	Shot#26: nl4 to 8e19, still at 5.5T - this should be a repeat of 17 and the early cases. another fizzle. That one went inside. next shot: icef4 10A more negative, pg4 back to 28msec
Oct 11 2002 03:14:54:287PM	1021011027	Steve Wolfe	Shot#27: nl4 to 8e19, still at 5.5T - this should be a repeat of 17 and the early cases. icef4 -1315->-1325, pg4 back to 28msec plasma: late hmode, no J4 after .66sec; Wukitch says screen supply went down.
Oct 11 2002 04:25:34:490PM	1021011028	Steve Wolfe	Shot#28: Move Dport from 1.3sec to 1.2sec; otherwise no changes - about one hour downtime to replace fuses in J4 screen supply. plasma, Hmode at 1.2sec, Again no J4. Possible a key wasn't turned to the correct position when they reset things; Dave is checking.
Oct 11 2002 04:46:48:850PM	1021011028	Steve Wolfe	Shot#28: The J4 problem is real, but cause still undetermined. END OF RUN

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	09:05:20:297AM	Plasma	Ok
2	09:18:46:837AM	Plasma	Ok
3	09:33:39:587AM	Plasma	Ok
4	09:49:42:443AM	Plasma	Ok
5	10:02:46:330AM	Plasma	Ok
6	10:23:23:213AM	Plasma	Ok
7	10:36:25:487AM	Plasma	Ok
8	10:50:00:810AM	Plasma	Ok
9	11:03:20:383AM	Plasma	Ok
10	11:16:23:860AM	Plasma	Ok
11	11:29:53:103AM	Plasma	Ok
12	11:42:57:930AM	Plasma	Ok
13	11:56:22:633AM	Plasma	Ok
14	12:13:15:253PM	Plasma	Ok
15	12:26:51:240PM	Plasma	Ok
16	12:40:34:223PM	Plasma	Ok
17	12:54:49:880PM	Plasma	Ok
18	01:08:11:990PM	Plasma	Ok
19	01:21:30:973PM	Plasma	Ok
20	01:34:44:440PM	Plasma	Ok
21	01:48:39:220PM	Plasma	Ok
22	02:02:38:370PM	Plasma	Ok
23	02:15:57:280PM	Plasma	Ok
24	02:29:00:457PM	Plasma	Ok
25	02:42:06:413PM	Plasma	Ok
26	02:57:22:010PM	Plasma	Ok
27	03:10:13:287PM	Plasma	Ok
28	04:18:44:793PM	Plasma	Ok