Miniproposals

Miniproposal: Date Filed: Title: First Author: Session Leader: Earl Marmar (shots 1-19)

Miniproposal: 283 Date Filed: 10/27/2000 Title: Long Pulse Plasma Operation First Author: Steve Wolfe Session Leader: Ian Hutchinson (shots 1-10)

Miniproposal: 286a Date Filed: 11/30/2000 Title: Divertor heating during long-pulse, low-density operation First Author: Jim Terry Session Leader: Jim Terry (shots 11-19)

Engineering Operator Run Comment

MP#283,MP#286,MP#EM_IHH; PO:Irby;SL:Terry/Marmar/Hutch; EO:Cochran/Dekow

Session Leader Plans

Physics Operators Plans

Session Leader Summaries

Entered: Jul 7 2004 03:49:28:383PM

Author: To Be Determined

Session Leader (1st ten shots) Hutch PO Irby Ten shots were dedicated to high-field plasma operation. We operated at toroidal fields up to 8.0T for the first time in several years. All systems functioned nominally, and several 1MA plasmas were produced. ICRF heating (D-He3 minority heating scenario) was applied successfully, but not efficiently. This operation was important to be sure that there was no engineering difficulty with 8T operation or to reveal those difficulties prior to magnet inspection. No problems were discovered.

Entered: Jul 7 2004 03:49:28:400PM

Author: To Be Determined

Phys op: J. Irby Session Leader: J. Terry/ S. Wolfe/ J. Irby Following is the report describing the second half of the 1010803 run, which continues with the long pulse experiments, investigating wall/gas inventory issues and divertor heating issues. RUNPLAN ECDC between shots in D2 for all shots to control the H/D Shot #"1" - begin from the low density shot 1010802022, but with 1 MW of RF from .6 s until 2.6 s. The Ip EOF is programmed for 3sec, and on 022 we got to 2.8 or so before it disrupted. The low density should be below the H-mode low density limit, so we can hope to remain in L-mode, but with somewhat higher temperature. This might be enough to prevent the ef1's from hitting the current limit and causing a disruption. However, we have no experience coupling to such a low density, so it may take a few shots to get the RF to stay on. Also on this shot repeat the pitcher puffs, which had some interesting features on 1010802022, however turn off the nl feedback during the puffs at 1 and 2 sec, so they aren't truncated by the feedback response. (On 022 these puffs broke the coupling between midplane pressure and density with the pressure staying high and the density dropping. This implies that something is changing in how the gas inventory is distributed.) Shot #"2" - same as #1, lower the Z position of the X-point early in the pulse by 1 cm. Don't try to keep it low since this will cause us to reach the EF1 limit. The Z position will therefore rise later in the pulse. Shot #"3" - same as #1, but increase the RF power to 1.5 MW and flap the flappers at 1.5 s and 2.5 s, OPEN for 0.25 s. (Keep the Pitcher puffs.) The increased RF power may put us into H-mode. Shot #"4" - Same as 1 and 2 but reduce EOF to 2.7 s and begin N_2 feedback to reduce the heatload on the divertor. Leave bolofeed on its present wire and change the Ref of 9-12 to "10", since strkpsi control isn't being used. Steve Wolfe has the wire set up correctly, so program the waveform to be ~30% higher than the "no-puff" signal put a gain of 5 on the wire. ***************************************** RESULTS We took over the run on shot 1010803011 and had 9 shots. This part of the run was successful. We investigated further, although did not solve, the low density gas inventory story. We showed that the wall does NOT saturate at a time <3 seconds, at least at the low densities run in this experiment. We also showed that the inventory in the walls is not so large that it will significantly affect our ability to run at low density. The shots related to these observations are 1010802021,002 and 1010803013 and 015 (X pt lower with no effect). We observed H-modes at NL04 of ~4e19 with a power of 1 MW. This may be the lowest density for H-mode on C-Mod. Shot 1010803014. We observed a (poorer) confinement mode at these low densities. Temperature drops, sawtooth amplitude decreases, and fueling efficiency decreases (as evidenced by the Ha increase). Shots 1010803011, 013, 015, 018, 019 and shots from 1010802 We were able to puff N_2 via feedback in an attempt to reduce the heat load on the divertor. The effects on the divertor were monitored by the IR camera, but the results still need analysis. This comparison occurred on shots 101080318 (no puff) and 019 (N_2 puff). Shot 011 - Ip flattop to 2.5 s, RF on at 1.0 MW for 1.9 s, causing dithers between ELMfree, EDA, and L-mode, neither gas puff is seen on the density, but there are steps in both the divertor pressure and the midplane pressure at each puff (no decay on midplane pressure, no decay on divertor pressure for first puff, long decay on second puff) pre H-mode density was 5e19 (NL04) (3e19 was programmed), post H-mode density was 1.18e20. Shot 012 - disrupted after breaker pulled at 0.53 s Shot 013 - Ip flattop to 2.86 s, RF on at 1.0 MW from 1.3 to 2.6 - no H-mode! both gas puffs are seen on density and midplane pressure - essentially the same as 1010802022. The implication from this shot and 1010802021 and 1010802022 is that the wall can only supply a small amount of gas which cannot lead to loss of density control at C-Mod densities (even AT current drive densities). pre H-mode density was 3e19 (NL04) Shot 014 - Asked for a repeat of 013, but with the X point lower by 1 cm early (i.e. at 1 s) in the pulse. result - Ip flattop to 2.5 s, RF on at 1.0 MW from 0.6 to 2.5 s, causing dithers between ELMfree, EDA, and L-mode. The reason it went into H-mode is because of a small puff arising from the antenna turn on. The density rise due to that puff was to 4e19. Neither gas puff is seen on the density, but there are steps in both the divertor pressure and the midplane pressure at each puff. Each puff changed the character of the H-mode. pre H-mode density was 3e19 (NL04) Shot 015 - Asked for a repeat of 014, but with no RF result - Ip flattop to 2.66s, The response to the puffs are very similar to shot 1010802022. There are steps in the midplane pressure at each puff. The conclusion is that the X pt position is not a factor in this midplane pressure phenomenon. non-puff density was 2.4e19 (NL04) Shot 016 - Start Nitrogen feedback - look for NVI - Lyman alpha in VUV Ask for 0.1 V on BOLOFEED Ask for 1 MW of RF from 0.6 to 2.6 s result - disrupted at 0.9s, i.e. before BOLOFEED had a chance to turn on. Shot 017 - Again attempt Nitrogen feedback - look for NVI - Lyman alpha in VUV Ask for 0.25 V on BOLOFEED Ask for 1 MW of RF from 0.6 to 2.6 s result - disrupted at 1.17s, this is before BOLOFEED was to turn on, but in fact the J-bottom (N_2) valve may have been open a little. No increased NVI was seen with McPherson. Shot 018 - Again attempt Nitrogen feedback - look for NVI - Lyman alpha in VUV Ask for 0.25 V on BOLOFEED Ask for 1 MW of RF from 0.6 to 2.6 s result- Ip flattop to 3.0 s, disrupted on the way down at 3.17 s. BOLOFEED was turned on. No increased NVI was seen with McPherson. Poor transport mode seen starting at 1.175 s (sawteeth amplitude decreases, H_a increases) density at 2.4e19 Shot 019 - Again attempt Nitrogen feedback - look for NVI - Lyman alpha in VUV Ask for 0.25 V on BOLOFEED, but increase gain by a factor of ~4 Ask for 1 MW of RF from 0.6 to 3.0 s result- Ip flattop to 2. s, disrupted. BOLOFEED was turned on. Increased NVI and NV was seen with McPherson -signal increased linearly from valve turn on. Strange transport mode seen starting at 1. 4 s (sawteeth amplitude decreases, H_a increases) coincident with the N_2 feedback valve opening density at 2.5e19

Physics Operator Summaries

Entered: Jul 7 2004 04:37:14:630PM

Author: To Be Determined

Physop Summary for Run 1010803 PO: Irby EO: Cochran, Dekow, Parkin SL: Terry/Marmar/Hutch Run in Support of: MP#283 Long Pulse MP#286 Divertor/Long Pulse MP#EM_IHH 8T operation Summary: This run went extremely well from the PO point-of-view. We began the run doing the high field tests. After a standard 5.3 T startup shot, we increased the TF field shot-to-shot in 0.5 T steps. Startup was very reliable, even though we made no attempt to keep the TF field constant at startup by changing the TF start time. We had two fizzles during this part of the run probably associated with pressure and not fields, though we did tweak Bz0 a couple of times. From data taken during the TF backporch it was clear that the joint resistances were not being affected by the high field operation during the shots. However, the between shot scanner measurements of the highest joint resistance actually decreased from the 4 to the 2 uOhm level. Backporch resistances were in the 1.8 to 1.9 uOhm range (about the same as 5 T operation). No excursions of joint resistance of interest were noted during long pulse operation either. OH coax resistances did go up during the high field run, but were coming back down during the long pulse operation. The machine ran well during long pulse operation also, except for the power supply limitations mentioned by Steve Wolfe in his 1010803 run summmary. We obtained several long discharges the longest of which lasted 3.12 s. The last three shots of the day were 2 s long, 150 kA, TF only shots to warm up the TF and make cylinder removal easier. We raised the TF temperature about 90 C by the end of shot 22. Problems during this run were associated mostly with settings of protection circuitry that required small tweaks as we attemped high field and long pulse operation. Several fuses were blown in the TF and at least one in the EF1 supply. We now have the data we need to improve these systems before the next period of long pulse operation (which I suspect will be before Mar 03). I would like to congratulate the many people involved in the months of effort required to run the long pulse work so successfully. Score: Plasmas 17 Fizzles 02 Tests 03 Cycles 22 Engineering setup for Run 1010802 PO: Irby EO: Cochran, Dekow, Parkin SL: Terry/Marmar/Hutch Run in Support of: MP#283 Long Pulse MP#286 Divertor/Long Pulse MP#EM_IHH 8T operation ECDC in D2 at 2.e-4 Torr overnight prior to run. Power systems as on 1010802019 or last shot of run 1010802 Gas setup: fill B-top with 6 psi of D2 Hybrid enabled (PG4) fill B-side lower with 1 psi of Ar Hybrid enabled (PG1) fill B-side upper with 30 psi of D2 Hybrid DISABLED (PG2) fill C-side with 30 psi of D2 Hybrid enabled (PG3) fill J-bottom with 30 psi of He Hybrid DISABLED (PG5) Enable the following gate valves: ECE, DNB, VUV RF: XMTR 1 thru 4 in run-on by 8:00 AM Run starts at 09:00 and ends at 19:00 From: JUKBOX::IRBY Date: 2-AUG-2001 18:03:44 Subj: Engineering Setup for Run 1010803 Engineering setup for Run 1010803 PO: Irby SL: Terry/Marmar/Hutch Run in Support of: MP#283 Long Pulse MP#286 Divertor/Long Pulse MP#EM_IHH 8T operation ECDC in D2 at 2.e-4 Torr overnight prior to run. Power systems as on 1010801027 We will start with the 8T run which should require about 10 shots and then return to the long pulse run Gas setup: fill B-top with 6 psi of D2 Hybrid enabled (PG4) fill B-side lower with 1 psi of Ar Hybrid enabled (PG1) fill B-side upper with 30 psi of D2 Hybrid DISABLED (PG2) fill C-side with 30 psi of D2 Hybrid enabled (PG3) fill J-bottom with 30 psi of N2 Hybrid DISABLED (PG5) Enable the following gate valves: ECE, DNB, VUV RF: XMTR 1 thru 4 in run-on by 8:00 AM Run starts at 09:00 and ends at 19:00 ---------------------------------------------------------------------------- 1010803xxx irby PHYSICS_OPERATOR Aug 4 2001 9:15:38:686AM . . . . . . . . . . . . . . . . . . . . Field table for high field run: Bt I -------- --------- 6.00 170.24 6.50 184.43 7.00 198.61 7.50 212.80 8.00 226.98 Did cold start rtnode -- data loaded, A matrix responds rtnode -- data loaded, M matrix responds rtnode -- data loaded, PID matrix responds RT_NODE Done 3-AUG-2001 08:03:04.33 ---------------------------------------------------------------------------- 1010803001 irby PHYSICS_OPERATOR Aug 3 2001 9:25:21:110AM . . . . . . . . . . . . . . . . . . . . Plasma Very low H/D: 3% or so ---------------------------------------------------------------------------- 1010803002 irby PHYSICS_OPERATOR Aug 3 2001 9:37:52:220AM . . . . . . . . . . . . . . . . . . . . Raised TF current to 170 kA --- 6T Programmed TF current to invert at 1 s, ramping to 0 at 2.5 s Ip rampdown starting at 1s, to 0 at 1.5 Reduced prepuff by 2ms Fizzle --- late breakdown ---------------------------------------------------------------------------- 1010803003 irby PHYSICS_OPERATOR Aug 3 2001 10:05:16:840AM . . . . . . . . . . . . . . . . . . . . Reduced prepuff again by 2 ms Raised field to 6.5 T, 185 kA Added backporch at 50kA from 1 to 1.5 s Plasma into rampdown Time (ms): 0 5 10 25 ---------------------------------------- Ip (kA): 0.8981 -14.7350 -25.1798 -97.9525 dIp/dt (kA/ms): -1.2198 -2.5533 -3.2527 -6.1139 pressure (mTorr): 0.0791 0.0782 0.0809 0.0740 Bz0 (mT): -3.9158 -1.1073 0.3821 16.5597 Br0 (mT): -0.8596 -0.6499 -1.3307 -1.8014 ---------------------------------------------------------------------------- 1010803004 irby PHYSICS_OPERATOR Aug 3 2001 10:36:38:640AM . . . . . . . . . . . . . . . . . . . . Going to 7 T, 199 kA Extended backporch to 3.0 s Removed 25 volt maintenance gas level (abt 20 t-l/s) Plasma into rampdown ---- ---------------------------------------------------------------------------- 1010803005 irby PHYSICS_OPERATOR Aug 3 2001 11:03:09:726AM . . . . . . . . . . . . . . . . . . . . Dropped nl04 request to 0.8e20 /m^2 Going to 7.5 T, 213 kA, start time 100 ms earlier to -1.6 s Note that PLC start for TF was -1 s Plasma into rampdown plus a pellet oh1: 0.6054 uohm oh2u: 1.6020 uohm oh2l: 1.9223 uohm ---------------------------------------------------------------------------- 1010803006 irby PHYSICS_OPERATOR Aug 3 2001 11:49:40:956AM . . . . . . . . . . . . . . . . . . . . TF PLC start to -1.5 s TF current to 227 kA, 8T Got to 7.96 T TF resistance temp change 39C Plasma into rampdown dE 374 MJ oh1: 0.5283 uohm oh2u: 1.5369 uohm oh2l: 1.6082 uohm ---------------------------------------------------------------------------- 1010803007 irby PHYSICS_OPERATOR Aug 3 2001 12:42:56:770PM . . . . . . . . . . . . . . . . . . . . Increased Ip to 1 MA Added helium 3 to b_side_upper at 6 psi TF current from 227 to 229 kA Change EF4 from -1305 to -1290 to fix possible problem with bz0 b_side_upper puff (pulse_gas2) at 100 volt from 0.3 to 0.32 s Will have D&E at 500 kW each from 0.6 to 0.9 s Fizzle with double bounce TF resistance temp change 45C oh1: 0.3395 uohm oh2u: 1.1071 uohm oh2l: 1.3175 uohm ---------------------------------------------------------------------------- 1010803008 irby PHYSICS_OPERATOR Aug 3 2001 1:06:20:056PM . . . . . . . . . . . . . . . . . . . . Added 1 ms to prepuff Got plasma, got rf MB79 at 1.84 uOhms at 3.4 s shot: 1010803008 oh1: 0.3901 uohm oh2u: 2.4281 uohm oh2l: 1.0807 uohm ---------------------------------------------------------------------------- 1010803009 irby PHYSICS_OPERATOR Aug 3 2001 1:45:39:120PM . . . . . . . . . . . . . . . . . . . . increased helium 3 puff by 20 ms (0.30 to 0.34 s) increase Tf current from 229 to 230 kJ plasma into rampdown, some heating oh1: 0.4471 uohm oh2u: 2.0931 uohm oh2l: 1.0715 uohm Bill C and Gary report that the bus is warming up to about 133F, also getting high, but acceptable, temps on interphase transformers. MB79 at 1.877 uOhms ---------------------------------------------------------------------------- 1010803010 irby PHYSICS_OPERATOR Aug 3 2001 2:12:10:633PM . . . . . . . . . . . . . . . . . . . . increased He3 puff to 80 ms (0.30 to 0.38 s) Plasma, used the last pellet Looks like we were heating somewhat.. oh1: 0.4503 uohm oh2u: 2.1695 uohm oh2l: 0.9488 uohm ---------------------------------------------------------------------------- 1010803011 irby PHYSICS_OPERATOR Aug 3 2001 3:00:27:966PM . . . . . . . . . . . . . . . . . . . . ************* Going back to long pulse run ***************** Loaded shot 1010802022 Dropped nl_04 gain to 0 from 1.0 to 1.05, and 2.0 to 2.05 s (during puffs) RF should be at 1 MW total from 0.6 to 2.6 s Have run ECDC in D2 at 2e-4 for 10 minutes Plasma for 2.49 s Forgot to disable b_side_upper so we got a puff at 0.3 s ---------------------------------------------------------------------------- 1010803012 irby PHYSICS_OPERATOR Aug 3 2001 3:54:43:776PM . . . . . . . . . . . . . . . . . . . . Moved 1st P Puff to 1.3 s (still 50 ms) 10 minutes of ECDC in D2 at 2.e-4 plasma until .5 s or so oh1: 0.4429 uohm oh2u: 1.0877 uohm oh2l: 0.9694 uohm ---------------------------------------------------------------------------- 1010803013 irby PHYSICS_OPERATOR Aug 3 2001 5:02:27:110PM . . . . . . . . . . . . . . . . . . . . Plasma for 2.9 s MB79 at 1.83 uOhms at 5.2 s ---------------------------------------------------------------------------- 1010803014 irby PHYSICS_OPERATOR Aug 3 2001 5:05:12:693PM . . . . . . . . . . . . . . . . . . . . Dropped ZXL from -.01 to -.02 until the 1st P puff Plasma to 2.6 s ---------------------------------------------------------------------------- 1010803015 irby PHYSICS_OPERATOR Aug 3 2001 5:17:43:546PM . . . . . . . . . . . . . . . . . . . . no PCS changes --- no rf plasma for 2.7 s oh1: 0.5686 uohm oh2u: 2.0071 uohm oh2l: 1.2924 uohm ---------------------------------------------------------------------------- 1010803016 irby PHYSICS_OPERATOR Aug 3 2001 5:54:19:006PM . . . . . . . . . . . . . . . . . . . . Changed EF2XEF4 from -2000 to -1000 in seg 2 and 3. Enabled the j-bottom bolo feedback plasma for 0.9 s oh1: 0.5634 uohm oh2u: 1.9930 uohm oh2l: 1.1426 uohm ---------------------------------------------------------------------------- 1010803017 irby PHYSICS_OPERATOR Aug 3 2001 6:10:05:920PM . . . . . . . . . . . . . . . . . . . . removed P puffs increased bolo req to 0.25 from 0.10 move ZXL back up to -.01 plasma for 1.16 s oh1: 0.6029 uohm oh2u: 1.9482 uohm oh2l: 1.3405 uohm ---------------------------------------------------------------------------- 1010803018 irby PHYSICS_OPERATOR Aug 3 2001 6:42:48:543PM . . . . . . . . . . . . . . . . . . . . EF2XEF4 to -2000 in seg 2 and 3 pulse_gas5 to -5 in seg 1, 2, and 3 plasma to 3.15 s TF delta 28 C oh1: 0.5795 uohm oh2u: 1.4274 uohm oh2l: 1.0237 uohm ---------------------------------------------------------------------------- 1010803019 irby PHYSICS_OPERATOR Aug 3 2001 7:16:38:530PM . . . . . . . . . . . . . . . . . . . . increased bolo gain to 9 great last plasma! Done ---------------------------------------------------------------------------- 1010803020 irby PHYSICS_OPERATOR Aug 3 2001 7:25:07:250PM . . . . . . . . . . . . . . . . . . . . 2 s long TF pulse for warm up TF delta 20 C ---------------------------------------------------------------------------- 1010803021 irby PHYSICS_OPERATOR Aug 3 2001 7:27:05:896PM . . . . . . . . . . . . . . . . . . . . Delta TF 24 C ---------------------------------------------------------------------------- 1010803022 irby PHYSICS_OPERATOR Aug 3 2001 8:12:09:840PM . . . . . . . . . . . . . . . . . . . . dT another 30C Done with warmup

Session Leader Comments
Aug 3 2001 03:14:28:263PM		Jim Terry	MP #286a (Long Pulse Experiments) will take over the 2nd half of the run. The plan (following the results of the 1010802 long pulse run) is as follows: Shot #1 - begin from the low density shot 1010802022, but with 1 MW of RF from .6 s until 2.6 s. The Ip EOF is programmed for 3sec, and on 022 we got to 2.8 or so before it disrupted. The low density should be below the H-mode low density limit, so we can hope to remain in L-mode, but with somewhat higher temperature. This might be enough to prevent the ef1's from hitting the current limit and causing a disruption. However, we have no experience coupling to such a low density, so it may take a few shots to get the RF to stay on. Also on this shot repeat the pitcher puffs, which had some interesting features on 1010802022, however turn off the nl feedback during the puffs at 1 and 2 sec, so they aren't truncated by the feedback response. (On 022 these puffs broke the coupling between midplane pressure and density with the pressure staying high and the density dropping.) Shot #2 - same as #1, lower the Z position of the X-point early in the pulse by 1 cm. Don't try to keep it low since this will cause us to reach the EF1 limit. The Z position will therefore rise later in the pulse. Shot #3 - same as #1, but increase the RF power to 1.5 MW and flap the flappers at 1.5 s and 2.5 s, OPEN for 0.25 s. (Keep the Pitcher puffs.) The increased RF power may put us into H-mode. Shot #4 - Same as 1 and 2 but reduce EOF to 2.7 s and begin N_2 feedback to reduce the heatload on the divertor. Leave bolofeed on its present wire and change the Ref of 9-12 to "10", since strkpsi control isn't being used. Steve Wofle has the wire set up correctly, so program the waveform to be ~30% higher than the "no-puff" signal put a gain of 5 on the wire. On the last 2 or 3 shots of the day extend the TF. J Irby to determine the extension timing.
Sep 25 2001 09:59:59:837AM	1010803001	Ian Hutchinson	Plasma. Standard 5.4T shot to start with. Looks fine.
Sep 25 2001 10:01:22:587AM	1010803002	Ian Hutchinson	Fizzle. 6.0T. 170kA. Fill =.09 mtorr.
Sep 25 2001 10:01:14:167AM	1010803003	Ian Hutchinson	Plasma. 6.5T, 185kA, Init is fine at 5.7T rising. 25deg TF temperature rise in the shot.
Sep 25 2001 10:01:05:853AM	1010803004	Ian Hutchinson	7T. Plasma. 5.7T at t=0.
Sep 25 2001 10:00:58:197AM	1010803005	Ian Hutchinson	Plasma. 7.47T briefly at end of flat top. Temperature rise 27deg C. Despite intending to start the TF earlier it did not happen. Must be because PLC start is at -1s. Move to -1.5s
Sep 25 2001 10:00:48:917AM	1010803006	Ian Hutchinson	Plasma. 225kA at about .6s, 7.94T Some fuse problems in the TF supply. Set up He3 to try some heating.
Sep 25 2001 10:00:39:493AM	1010803007	Ian Hutchinson	Fizzle 226kA. 45deg C temperature rise. 8.0T
Sep 25 2001 10:00:30:633AM	1010803008	Ian Hutchinson	Plasma. 8T with 1 MW RF and 20ms He3 puff. Some neutron response to RF. No electron heating.
Sep 25 2001 10:00:22:540AM	1010803009	Ian Hutchinson	Plasma. 8.03T. 40ms He3 puff. 1.5MW RF. Visible Te rise, although its seems to lag the neutron rise.
Sep 25 2001 10:00:13:650AM	1010803010	Ian Hutchinson	Plasma. 80ms He3. 1.8MW RF. Li pellet gives P-mode. Obvious heating of electrons and ions. End of 8T Operation. Summary: Eight Tesla operation went fine with no unexpected engineering difficulties. There is no evidence of degradation of the magnet operation at 8T. RF heating at 8T is inefficient as always, but temperature rises were seen. Shot 10 was an interesting pellet shot. The 10 shots we had covered our intentions fully and successfully.
Aug 3 2001 03:11:00:953PM	1010803011	Jim Terry	MP #286a (Long Pulse Experiments) took over the run on shot 1010803011 Shot 011 - Ip flattop to 2.5 s (disrupted), RF on at 1.0 MW for 1.9 s, causing dithers between ELMfree, EDA, and L-mode, neither gas puff is seen on the density, but there are steps in both the divertor pressure and the midplane pressure at each puff (no decay on midplane pressure, no decay on divertor pressure for first puff, long decay on second puff) pre H-mode density was 5e19 (NL04), post H-mode density was 1.18e20.
Aug 3 2001 04:02:55:887PM	1010803012	Jim Terry	Asked for a repeat of 011, but with 1st puff delayed to 1.3 s. Hopefully pre-H-mode density will be lower Shot 012 - breaker pulled at 0.5 s, plasma disrupted at 0.53 s
Aug 3 2001 04:27:10:260PM	1010803013	Jim Terry	Asked for a repeat of 011, but with 1st puff delayed to 1.3 s. Hopefully pre-H-mode density will be lower Shot 013 - Ip flattop to 2.86 s, (then disrupted at 2.95 s), RF on at 1.0 MW from 1.3 to 2.6 - no H-mode! both gas puffs are seen on density and midplane presure - essentially the same as 1010802022. pre H-mode density was 3e19 (NL04)
Aug 3 2001 05:17:51:640PM	1010803014	Jim Terry	Asked for a repeat of 013, but with X pt lowered by 1 cm at 1 s Shot 014 - Ip flattop to 2.6s, RF on at 1.0 MW from 0.6 to 2.6 s, causing dithers between ELMfree, EDA, and L-mode. The reason it went into H-mode is because of a small puff arising from the antenna turn on. The density rise due to that puff was to 4e19. Neither gas puff is seen on the density, but there are steps in both the divertor pressure and the midplane pressure at each puff. Each puff changed the character of the H-mode. pre H-mode density was 3e19 (NL04)
Aug 3 2001 05:31:01:370PM	1010803015	Jim Terry	Asked for a repeat of 014, but with no RF Shot 015 - Ip flattop to 2.66s, The response to the puffs are very similer to shot 1010802022. There are steps in the midplane pressure at each puff. The conclusion is that the X pt position is not a factor in this midplane pressure phenomenon. non-puff density was 2.4e19 (NL04)
Aug 3 2001 05:43:13:657PM	1010803016	Jim Terry	Start Nitrogen feedback - look for NVI - Lyman alpha in VUV Ask for 0.1 V on BOLOFEED Ask for 1 MW of RF from 0.6 to 2.6 s Shot 016 - disrupted at 0.9s, i.e. before BOLOFEED had a chance to turn on.
Aug 3 2001 06:28:38:953PM	1010803017	Jim Terry	Again attempt Nitrogen feedback - look for NVI - Lyman alpha in VUV Ask for 0.25 V on BOLOFEED Ask for 1 MW of RF from 0.6 to 2.6 s Shot 017 - disrupted at 1.17s, this is before BOLOFEED was to turn on, but in fact the J-bottom (N_2) valve may have been open a little. No increased NVI was seen with McPherson.
Aug 3 2001 06:47:27:350PM	1010803018	Jim Terry	Again attempt Nitrogen feedback - look for NVI - Lyman alpha in VUV Ask for 0.25 V on BOLOFEED Ask for 1 MW of RF from 0.6 to 2.6 s Shot 018 - Ip flattop to 3.0 s, disrupted on the way down at 3.17 s. BOLOFEED was turned on. No increased NVI was seen with McPherson. Strange transport mode seen starting at 1.175 s (sawteethampliturde decreases, H_a increases) density at 2.4e19
Aug 3 2001 07:48:06:373PM	1010803019	Jim Terry	Again attempt Nitrogen feedback - look for NVI - Lyman alpha in VUV Ask for 0.25 V on BOLOFEED Ask for 1 MW of RF from 0.6 to 3.0 s Shot 019 - Ip flattop to 2.92 s, disrupted. BOLOFEED was turned on. Increased NVI and NV was seen with McPherson. Poor transport mode seen starting at 1.43 s (sawteeth amplitude decreases, H_a increases) coincident with N_2 feedback valve opening. density at 2.5e19

Physics Operator Comments
Aug 4 2001 09:15:38:687AM		Jim Irby	------------------------------------------------------------------------- Field table for high field run: Bt I -------- --------- 6.00 170.24 6.50 184.43 7.00 198.61 7.50 212.80 8.00 226.98 Did cold start rtnode -- data loaded, A matrix responds rtnode -- data loaded, M matrix responds rtnode -- data loaded, PID matrix responds RT_NODE Done 3-AUG-2001 08:03:04.33
Aug 3 2001 09:25:21:110AM	1010803001	Jim Irby	Plasma Very low H/D: 3% or so
Aug 3 2001 09:37:52:220AM	1010803002	Jim Irby	Raised TF current to 170 kA --- 6T Programmed TF current to invert at 1 s, ramping to 0 at 2.5 s Ip rampdown starting at 1s, to 0 at 1.5 Reduced prepuff by 2ms Fizzle --- late breakdown
Aug 3 2001 10:05:16:840AM	1010803003	Jim Irby	Reduced prepuff again by 2 ms Raised field to 6.5 T, 185 kA Added backporch at 50kA from 1 to 1.5 s Plasma into rampdown Time (ms): 0 5 10 25 ---------------------------------------- Ip (kA): 0.8981 -14.7350 -25.1798 -97.9525 dIp/dt (kA/ms): -1.2198 -2.5533 -3.2527 -6.1139 pressure (mTorr): 0.0791 0.0782 0.0809 0.0740 Bz0 (mT): -3.9158 -1.1073 0.3821 16.5597 Br0 (mT): -0.8596 -0.6499 -1.3307 -1.8014
Aug 3 2001 10:36:38:640AM	1010803004	Jim Irby	Going to 7 T, 199 kA Extended backporch to 3.0 s Removed 25 volt maintenance gas level (abt 20 t-l/s) Plasma into rampdown ----
Aug 3 2001 11:03:09:727AM	1010803005	Jim Irby	Dropped nl04 request to 0.8e20 /m^2 Going to 7.5 T, 213 kA, start time 100 ms earlier to -1.6 s Note that PLC start for TF was -1 s Plasma into rampdown plus a pellet oh1: 0.6054 uohm oh2u: 1.6020 uohm oh2l: 1.9223 uohm
Aug 3 2001 11:49:40:957AM	1010803006	Jim Irby	TF PLC start to -1.5 s TF current to 227 kA, 8T Got to 7.96 T TF resistance temp change 39C Plasma into rampdown dE 374 MJ oh1: 0.5283 uohm oh2u: 1.5369 uohm oh2l: 1.6082 uohm
Aug 3 2001 12:42:56:770PM	1010803007	Jim Irby	Increased Ip to 1 MA Added helium 3 to b_side_upper at 6 psi TF current from 227 to 229 kA Change EF4 from -1305 to -1290 to fix possible problem with bz0 b_side_upper puff (pulse_gas2) at 100 volt from 0.3 to 0.32 s Will have D&E at 500 kW each from 0.6 to 0.9 s Fizzle with double bounce TF resistance temp change 45C oh1: 0.3395 uohm oh2u: 1.1071 uohm oh2l: 1.3175 uohm
Aug 3 2001 01:06:20:057PM	1010803008	Jim Irby	Added 1 ms to prepuff Got plasma, got rf MB79 at 1.84 uOhms at 3.4 s shot: 1010803008 oh1: 0.3901 uohm oh2u: 2.4281 uohm oh2l: 1.0807 uohm
Aug 4 2001 10:15:57:233AM	1010803009	Jim Irby	increased helium 3 puff by 20 ms (0.30 to 0.34 s) increase Tf current from 229 to 230 kA plasma into rampdown, some heating oh1: 0.4471 uohm oh2u: 2.0931 uohm oh2l: 1.0715 uohm Bill C and Gary report that the bus is warming up to about 133F, also getting high, but acceptable, temps on interphase transformers. MB79 at 1.877 uOhms
Aug 3 2001 02:12:10:633PM	1010803010	Jim Irby	increased He3 puff to 80 ms (0.30 to 0.38 s) Plasma, used the last pellet Looks like we were heating somewhat.. oh1: 0.4503 uohm oh2u: 2.1695 uohm oh2l: 0.9488 uohm
Aug 3 2001 03:00:27:967PM	1010803011	Jim Irby	************* Going back to long pulse run ***************** Loaded shot 1010802022 Dropped nl_04 gain to 0 from 1.0 to 1.05, and 2.0 to 2.05 s (during puffs) RF should be at 1 MW total from 0.6 to 2.6 s Have run ECDC in D2 at 2e-4 for 10 minutes Plasma for 2.49 s Forgot to disable b_side_upper so we got a puff at 0.3 s
Aug 3 2001 03:54:43:777PM	1010803012	Jim Irby	Moved 1st P Puff to 1.3 s (still 50 ms) 10 minutes of ECDC in D2 at 2.e-4 plasma until .5 s or so oh1: 0.4429 uohm oh2u: 1.0877 uohm oh2l: 0.9694 uohm
Aug 3 2001 05:02:27:110PM	1010803013	Jim Irby	Plasma for 2.9 s MB79 at 1.83 uOhms at 5.2 s
Aug 3 2001 05:05:12:693PM	1010803014	Jim Irby	Dropped ZXL from -.01 to -.02 until the 1st P puff Plasma to 2.6 s
Aug 3 2001 05:17:43:547PM	1010803015	Jim Irby	no PCS changes --- no rf plasma for 2.7 s oh1: 0.5686 uohm oh2u: 2.0071 uohm oh2l: 1.2924 uohm
Aug 3 2001 05:54:19:007PM	1010803016	Jim Irby	Changed EF2XEF4 from -2000 to -1000 in seg 2 and 3. Enabled the j-bottom bolo feedback plasma for 0.9 s oh1: 0.5634 uohm oh2u: 1.9930 uohm oh2l: 1.1426 uohm
Aug 3 2001 06:10:05:920PM	1010803017	Jim Irby	removed P puffs increased bolo req to 0.25 from 0.10 move ZXL back up to -.01 plasma for 1.16 s oh1: 0.6029 uohm oh2u: 1.9482 uohm oh2l: 1.3405 uohm
Aug 3 2001 06:42:48:543PM	1010803018	Jim Irby	EF2XEF4 to -2000 in seg 2 and 3 pulse_gas5 to -5 in seg 1, 2, and 3 plasma to 3.15 s TF delta 28 C oh1: 0.5795 uohm oh2u: 1.4274 uohm oh2l: 1.0237 uohm
Aug 3 2001 07:16:38:530PM	1010803019	Jim Irby	increased bolo gain to 9 great last plasma! Done
Aug 3 2001 07:25:07:250PM	1010803020	Jim Irby	2 s long TF pulse for warm up TF delta 20 C
Aug 3 2001 07:27:05:897PM	1010803021	Jim Irby	Delta TF 24 C
Aug 3 2001 08:12:09:840PM	1010803022	Jim Irby	dT another 30C Done with warmup

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	09:07:02:050AM	Plasma	Ok
2	09:30:59:697AM	Plasma	Ok
3	09:58:54:473AM	Plasma	Ok
4	10:29:13:880AM	Plasma	Ok
5	10:51:32:850AM	Plasma	Ok
6	11:14:59:573AM	Plasma	Ok
7	12:24:13:913PM	Plasma	Ok
8	12:49:52:220PM	Plasma	Ok
9	01:26:05:730PM	Plasma	Ok
10	01:58:46:947PM	Plasma	Bad	Tf conduction fault
11	02:42:35:040PM	Plasma	Ok
12	03:22:41:177PM	Plasma	Bad	OH2L comm Fault
13	03:51:51:037PM	Plasma	Ok
14	04:21:39:377PM	Plasma	Bad	PF breaker opened ~800mS after disruption,
15	05:05:52:290PM	Plasma	Ok
16	05:39:47:743PM	Plasma	Ok
17	06:02:24:437PM	Plasma	Ok
18	06:25:51:950PM	Plasma	Ok
19	06:53:15:080PM	Plasma	Ok
20	07:11:36:803PM	Test	Ok	TF warmup
21	07:20:04:070PM	Test	Ok
22	07:31:10:293PM	Test	Ok