| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | Paul Bonoli |
| Physics operator(s): | Steve Wolfe |
| Engineering operator(s): | Ed Fitzgerald |
| Engineering Operator Run Comment |
| MP#277A Two freq heating and ITB Physics SL:Bonoli PO:Wolf EO:Fitzgerald |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:26:053PM |
| Author: To Be Determined |
| Run Summary for Thursday - December 14, 2000 Mini-proposal No. 277A: Internal Transport Barrier Studies at 4.5T with Simultaneous Central and Off-axis ICRF Heating 1001214 Physics Operator: Steve Wolfe Session Leader: Paul Bonoli ____________________________________________________________________________ Run Summary ____________________________________________________________________________ This was a somewhat frustrating run day, although we did obtain some interesting results: For example on shot 001 an EDA H-mode was obtained with about 400 kW of central heating from the 70 MHz ICRF system alone. Also on shot 015 we obtained a significant increase in the neutron rate (factor of 2) and an increase in stored energy when the 70 MHz ICRF power was overlapped for 200 msec with the 80 MHz off-axis heating power in a density barrier mode. Difficulties were experienced later in the run (see shots 018-024) in producing the density barrier mode reliably because of a significant time delay in the transition to an EDA H-mode. The 70 MHz power from J-port was also limited to about 600-800 kW because of arcing in the J-port transmission line system. On shots 001-012, the 70 MHz heating power was turned on alone from (0.6 - 1.5) sec. This part of the run plan was intended to establish that the J-port system was heating the central plasma effectively. A low power threshold (about 400 kW) was found to get the plasma into a slightly delayed EDA H-mode (see shot 001 for example). At higher power (about 800 kW), core electron heating from the (H) minority tail could also be seen on the central GPC channel (see shot 004). At about 600 kW and higher, the J-port system shut down because of faults related to arcing in the transmission line system. On shots 013-018, 2 MW of 80 MHz off-axis ICRF power (D & E ports) was turned on from 0.7 - 1.5 sec. The J-port power was turned on from 1.3-1.5 sec. at levels ranging from 700-850 kW. Perhaps the "best" discharge in this sequence is shot 015 where J-port stayed on for its entire pulse as its power ramped up to 700 kW. [Using powers higher than this caused faults.] On shot 015 a density barrier mode was established with the 80 MHz heating and ne0_TS increased to 3.8 X10^20 before the J-port turn-on. At the J-port turn-on, the density rise "arrested" itself. However, the neutron rate more than doubled from 4.2 X10^12 to 9 X 10^12. Also the stored energy increased from about 85 kJ to almost 100 kJ and Te(0) increased (from GPC). Although the density stopped increasing when the 70 MHz power was applied, it may be that an improved confinement mode with a thermal barrier still exists and the barrier is simply "leaking" more. Indeed the increased neutron rate and central electron heating that was observed during application of the 70 MHz power may be indicative of heating inside a thermal barrier. This can be tested by revisiting shots 013-018 with more ICRF power from J-port and measuring the ion temperature profile with HIREX. During the remainder of the run (shots 019-024) we intended to vary the power levels and relative timings of the 80 and 70 MHz ICRF powers. This part of the run plan was not carried out however, because of difficulties in producing the density barrier mode. Typically, the transition to an EDA type H-mode would occur around 1.1-1.2 sec. and might be preceeded by an ELM-free H-mode phase. |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:37:12:850PM |
| Author: To Be Determined |
| Physics Operator Summary for Thursday, Dec 14, 2000 MP#277A Internal Transport Barrier Studies at 4.5~T with Simultaneous Central and Off-axis ICRF Heating SL: Bonoli PO: wolfe EO: Fitzgerald, The run is scheduled to begin at 07:30 and end at 15:30 to allow people to get to the PSFC Holiday Party. Plan: ===== ECDC in D2 overnight, ending at least one hour before start of run Power systems as on 1001213001 Gas Setup: fill B-top with 6 psi of D2 Hybrid enabled fill B-side lower with 1 psi of Ar Hybrid enabled fill B-side upper with 35 psi of D2 Hybrid DISABLED, for ECDC fill C-side with 30 psi of D2 Hybrid enabled leave J-bot as is Hybrid DISABLED Enable the following gate valves: ECE, VUV, DNB RF Setup: XMTRs 1,2, and 4 should be made ready for operation by 7:00 Plan: We will continue with the two-frequency heating experiment from where it left off on Wednesday, and get as far as we can. This is a continuation of the "2 day run plan" posted for 1001212. We will start the day injecting only the 70 MHz ICRF power into plasmas at 4.5 T in order to produce ICRF heated H-modes at 4.5 T. Shots will be required to bring the ICRF power levels up from the 500-600 kW level of Wednesday (1001213). We will then proceed on to the simultaneous injection of ICRF power at 70 and 80 MHz in an attempt to heat (on-axis) the density barrier mode. A proposed shot sequence is given below: (a) Establish an ICRF heated H-mode at 4.5~T with central ICRF heating only (70~MHz and 1.5-2~MW). (10-15 shots) (i) Use about 10-12 shots to bring up ICRF power at 70 MHz and establish H-mode at 4.5 T. (ii) Measure central electron temperature heating using GPC in (i). (iii) Investigate power threshold for H-mode in (i). (b) Apply both frequencies at 4.5~T using 2~MW at each frequency. Look for thermal energy barrier formation. Investigate the effect of turning the 70 MHz power on at different times and power levels in order to sustain and successfully heat the barrier mode during two-frequency injection. (10-15 shots) (i) Measure T_i profile and poloidal rotation profile using HIREX over a 4 shot sequence once an acceptable two- frequency ITB is established. (ii) Measure N_e profile from visible bremsstrahlung (iii) Measure T_i(0) from neutrons and T_e(0) from Thomson scattering. Note that we have started from a segment 2 originally run in June, which does not have the more recent offset values on CLEARIN and RCUR (12700 and 0, respectively). Therefore, the gaps will change significantly if we change current. However, since only 800kA shots are called for in the run plan, I will not take run time to tune up a corrected predictor set. Results: ======== The run started on time at 7:30, and the shot rate was good, until we got held up for an hour by a data system hang (file lock) after shot 5. Josh cleared it after he got in from a weather-delayed commute. We started with the same shot as the last one on Wednesday, except for lowering the argon puff to 30msec (from 50 !), and slightly lower RF power from J-port (70MHz). The first series of shots were used to bring up the 70MHz power. All of these got into H-mode. There were only a few PCS tweaks during these shots, a couple in seg 1 and some gap adjustment in seg 2. We took 12 shots with only J, but were unable to get above 1.05MW. We then moved on to part b, with D&E (80MHz) on early and J (70MHz) at 1.3 sec. The core barrier formation was poor and non-reproducible. The H-mode start was delayed until .9 or 1.0 sec (RF on at .7). Starting the RF pulse at 0.5sec and 2.5MW (shot 20) produced an early H-mode, and a disruption at 1sec. Susequent shots at 2MW with the same timing had H-modes delayed to between .9 and 1.05sec. We changed field between 4.4 and 4.6T, without obvious effect. Turning off the DNB (shot 23) did not help. Reloading shot 1001213016, which had an early H-mode and strong peaking, did not help either (shot 24), although JR reported that the Mo was down by a factor of 3 relative to earlier in the day. As a result of the lack of prompt L-H transitions and the general lack of ITB formation we made essentially NO progress on part b of the plan. The most promising shot in the second phase of the run was #17, which had some peaking, and also exhibited a strong MHD mode that lasted for much of the shot. This looked like an m=1 snake on the xrays; note that Ian pointed out that the xray signals are aliased on this oscillation, which was actually around 5kHz as seen on ECE. Note that the last shot was based on shot 16 from Wednesday, and has a 50msec Ar puff and moving outer gap. Also, this shot has the tf rampdown starting at 1.4 sec, instead of 1.5, which I had remedied on shot 18. The machine ran well today, with only one fizzle (shot 6). Current rise was generally fast, and the plasma moved out some, but only bounced on shots 5 and 6. I adjusted the pre-puff several times, and increased the segment 1 RCUR offset from 5500 to 6500 to keep the outward motion under control. There were no power system problems today. We had two data system hangs, a file lock problem after shot 5 and a server hang on the video_camera storage after shot 17. On shot 20, the bus rogowski data didn't come through, with a "device not triggered" error; I stored this module (INCAA_1) manually. We had a similar problem yesterday, and it was discovered that the dig frequency was at too low a value, causing the data to still be being taken at the pulse- recool transition. We may need to delay the sequence number (presently 30) of the store action on this module. Cooling was relatively fast all day, with a shot cycle of ~12 minutes in the morning, slowing to ~15-17min by the end of the day. The DNB was firing from shot 6 on, at .5sec until shot 19, then at .3 sec, except for shot 23 when they were asked to refrain; there were no obvious deleterious effects. The tokamak does not seem to mind getting started early. However, it is not clear that what got accomplished was worth the loss of sleep. Scorecard: ---------- Tests 0 Duds 0 Fizzles 1 Plasmas 23 ------- -- Shots 24 |
| Session Leader Comments | |||
| Dec 14 2000 07:57:17:280AM | 1001214001 | Paul Bonoli | 1001214001 Request: Wa D and E -port (80 MHz) shut off J-port (70 MHz) turned on - ramp up to 500 kW Result: Plasma - nice H-mode at 0.94 sec. J - port ran through with no faults. No HIREX (turn on Argon puff) Raise ICRF power next shot |
| Dec 14 2000 07:57:56:623AM | 1001214002 | Paul Bonoli | 1001214002 Request: I_p = 800 kA, B_t = 4.5 T, nl_04 = 0.75 (target) D and E -port (80 MHz) shut off J-port - ramp up to 700 kW Result: Plasma - H-mode again at 0.99 sec. J - port ran with one faults. Raise ICRF power again on next shot Some evidence od density peaking after the rf turns off. |
| Dec 14 2000 08:12:36:623AM | 1001214003 | Paul Bonoli | 1001214003 Request: I_p = 800 kA, B_t = 4.5 T, nl_04 = 0.75 (target) D and E -port (80 MHz) shut off J-port - ramp up to 900 kW Result: Plasma - H-mode at 0.85 sec. J - port ran to 0.85 sec. and then failed on re-tries. H/D = 0.04 Some indication of central electron heating by ICRF on GPC Take shot again at same power level -> keep plasma - antenna gap more constant. |
| Dec 14 2000 08:26:10:700AM | 1001214004 | Paul Bonoli | 1001214004 Request: I_p = 800 kA, B_t = 4.5 T, nl_04 = 0.75 (target) D and E -port (80 MHz) shut off J-port - ramp up to 1 Mw Result: Plasma - H-mode at 0.84 sec. J - port ran through after recovering from trips at 0.92 sec. H/D = 0.04 Increase ICRF power again by 200 kW |
| Dec 14 2000 08:46:25:530AM | 1001214005 | Paul Bonoli | 1001214005 Request: I_p = 800 kA, B_t = 4.5 T, nl_04 = 0.75 (target) D and E -port (80 MHz) shut off J-port - ramp up to 1.2 Mw Result: Plasma - H-mode from 0.73 to 0.93 sec. J - port ran to 0.73 sec (0.95 MW) and faulted out. H/D = 0.04 Take shot over again at same ICRf power (1.2 MW) |
| Dec 14 2000 09:51:31:000AM | 1001214006 | Paul Bonoli | 1001214006 - One hour delay because dtata system was hung up Request: I_p = 800 kA, B_t = 4.5 T, nl_04 = 0.75 (target) D and E -port (80 MHz) shut off J-port - ramp up to 1.2 Mw Result: Fizzle - |
| Dec 14 2000 10:09:56:873AM | 1001214007 | Paul Bonoli | 1001214007 Request: I_p = 800 kA, B_t = 4.5 T, nl_04 = 0.75 (target) D and E -port (80 MHz) shut off J-port - ramp up to 1.2 Mw Result: Plasma with H-mode, but ICRF faults out at 0.78 sec. Steve Wukitch believes this may be a conditioning problem - we will take more shots at this power level since the ICRF power is staying on longer during the re-tries. |
| Dec 14 2000 10:37:23:967AM | 1001214008 | Paul Bonoli | 1001214008 Request: I_p = 800 kA, B_t = 4.5 T, nl_04 = 0.75 (target) D and E -port (80 MHz) shut off J-port - ramp up to 1.2 Mw Result: Plasma with H-mode. H-mode transition occurs at 0.83 sec. with 750 kW of ICRF power. ICRF again faults out at 1.06 sec. and then shuts off after multiple re-tries. |
| Dec 14 2000 10:51:43:233AM | 1001214009 | Paul Bonoli | 1001214009 Request: I_p = 800 kA, B_t = 4.5 T, nl_04 = 0.75 (target) D and E -port (80 MHz) shut off J-port - ramp up to 1.2 Mw Result: Plasma with H-mode - similar to shot 008 H-mode transition again occurs at 0.83 sec. ICRF shuts off after multiple faults - install a 3 db attenuator in the fault detection circuit for J-port. |
| Dec 14 2000 11:01:32:890AM | 1001214010 | Paul Bonoli | 1001214010 Request: I_p = 800 kA, B_t = 4.5 T, nl_04 = 0.75 (target) D and E -port (80 MHz) shut off J-port - ramp up to 1.2 Mw Result: Plasma with two H-modes J-port ran through now with fault recovery. Raise ICRF power to 1.4 MW next shot. |
| Dec 14 2000 11:20:48:827AM | 1001214011 | Paul Bonoli | 1001214011 Request: I_p = 800 kA, B_t = 4.5 T, nl_04 = 0.75 (target) D and E -port (80 MHz) shut off J-port - ramp up to 1.4 Mw Result: Plasma with H-mode at 0.80 sec. J-port faulted at L-H transition. Increase plasma - antenna gap by a few millimeters and back off on ICRF power. |
| Dec 14 2000 11:43:05:170AM | 1001214012 | Paul Bonoli | 1001214012 Request: I_p = 800 kA, B_t = 4.5 T, nl_04 = 0.75 (target) D and E -port (80 MHz) shut off J-port - ramp up to 1.2 Mw Result: Plasma with H-mode, but rf faults occurred again Time to move on to two-frequency shots. |
| Dec 14 2000 12:42:10:890PM | 1001214013 | Paul Bonoli | 1001214013 Request: I_p = 800 kA, B_t = 4.5 T, nl_04 = 0.75 (target) D and E -port (80 MHz) turned on from 0.7 to 1.5 sec. (0.5 MW /port) J-port - on from 1.3 to 1.5 sec. (0.7 MW). Result: Plasma with two H-modes - not a clear density barrier yet. D and E ran through J ran through with faults. Raise D and E - powers by 0.25 MW / port |
| Dec 14 2000 12:41:35:560PM | 1001214014 | Paul Bonoli | 1001214014 Request: I_p = 800 kA, B_t = 4.5 T, nl_04 = 0.75 (target) D and E -port (80 MHz) turned on from 0.7 to 1.5 sec. (0.75 MW /port) J-port - on from 1.3 to 1.5 sec. (0.7 MW). Result: Interesting shot - plasma went into H-mode (delayed). When J-port turns on neutrons increase to 8 X 10^12 ! - it seems we may have done some heating inside the plasma core. D and E ran through J ran through with only a single trip. Raise D and E - powers by 0.25 MW / port |
| Dec 14 2000 01:03:30:687PM | 1001214015 | Paul Bonoli | 1001214015 Request: I_p = 800 kA, B_t = 4.5 T, nl_04 = 0.75 (target) D and E -port (80 MHz) turned on from 0.7 to 1.5 sec. (1.0 MW /port) J-port - on from 1.3 to 1.5 sec. (0.7 MW). Result: Interesting shot again - plasma went into H-mode (delayed only to 0.9 sec) When J-port turns on neutrons increase to 8 X 10^12 ! - it seems we may have done some heating inside the plasma core. D and E ran through J ran through also. Take shot again since clear density peaking still not observed. |
| Dec 14 2000 12:55:07:140PM | 1001214016 | Paul Bonoli | 1001214016 Request: I_p = 800 kA, B_t = 4.5 T, nl_04 = 0.75 (target) D and E -port (80 MHz) turned on from 0.7 to 1.5 sec. (1.0 MW /port) J-port - on from 1.3 to 1.5 sec. (0.7 MW). Result: Interesting - plasma went into H-mode (delayed again to 0.9 sec) When J-port turns on neutrons increase to 1 X 10^13 ! - it seems we may have done some heating inside. D and E ran through J ran through also. Still no clear indiciation of density peaking. Reduce B_t to 4.4 T to see if density peaking comes back. |
| Dec 14 2000 01:38:33:530PM | 1001214017 | Paul Bonoli | 1001214017 Request: I_p = 800 kA, B_t = 4.4 T, nl_04 = 0.75 (target) D and E -port (80 MHz) turned on from 0.7 to 1.5 sec. (1.0 MW /port) J-port - on from 1.3 to 1.5 sec. (0.7 MW). Result: Interesting - plasma went into H-mode. More density peaking - NROOT_zeff = 6.3 X 10^20 D and E ran through J ran with some faults. This looked pretty good - take the shot again. |
| Dec 14 2000 01:51:11:607PM | 1001214018 | Paul Bonoli | 1001214018 Request: I_p = 800 kA, B_t = 4.4 T, nl_04 = 0.75 (target) D and E -port (80 MHz) turned on from 0.7 to 1.5 sec. (1.0 MW /port) J-port - on from 1.3 to 1.5 sec. (0.7 MW). Result: Got delayed H-mode. No density peaking on this shot. D and E ran through J ran with some faults. Try raising the D & E power on the next shot to 2.5 MW total |
| Dec 14 2000 02:07:20:013PM | 1001214019 | Paul Bonoli | 1001214019 Request: I_p = 800 kA, B_t = 4.4 T, nl_04 = 0.75 (target) D and E -port (80 MHz) turned on from 0.7 to 1.5 sec. (1.25 MW /port) J-port - on from 1.3 to 1.5 sec. (0.7 MW). Result: Got delayed H-mode. No density peaking on this shot either. D ran to 1.04 sec and faulted out. E ran through J ran with nicely Turn rf on at 0.5 sec to remedy late H_mode transition Raise J-port power |
| Dec 14 2000 02:22:47:513PM | 1001214020 | Paul Bonoli | 1001214020 Request: I_p = 800 kA, B_t = 4.4 T, nl_04 = 0.75 (target) D and E -port (80 MHz) turned on from 0.7 to 1.5 sec. (1.25 MW /port) J-port - on from 1.3 to 1.5 sec. (0.8 MW). Results: Got the early H-mode - finally! But the plasma disrupted at 1.0 sec because of impurity influx from E-port (we think). Back off on on total ICRF power to 2.0 MW and keep timing the same (turn on D and E prots at 0.5 sec.). |
| Dec 14 2000 02:41:27:077PM | 1001214021 | Paul Bonoli | 1001214021 Request: I_p = 800 kA, B_t = 4.4 T, nl_04 = 0.75 (target) D and E -port (80 MHz) turned on from 0.7 to 1.5 sec. (1.00 MW /port) J-port - on from 1.3 to 1.5 sec. (0.8 MW). Results: Got a delayed H-mode again - but no disruption. D and E stayed on, but J had multiple faults. Go back to 4.6 T in hopes that it will be easier to get the plasma into EDA H-mode. |
| Dec 14 2000 02:47:51:090PM | 1001214022 | Paul Bonoli | 1001214022 Request: I_p = 800 kA, B_t = 4.6 T, nl_04 = 0.75 (target) D and E -port (80 MHz) turned on from 0.7 to 1.5 sec. (1.00 MW /port) J-port - on from 1.3 to 1.5 sec. (0.8 MW). Results: Got a delayed H-mode again - but no disruption. D and E stayed on, but J had multiple faults. Go back to 4.6 T in hopes that it will be easier to get the plasma into EDA H-mode. |
| Dec 14 2000 03:16:07:280PM | 1001214023 | Paul Bonoli | 1001214023 Request: I_p = 800 kA, B_t = 4.6 T, nl_04 = 0.75 (target) D and E -port (80 MHz) turned on from 0.7 to 1.5 sec. (1.00 MW /port) J-port - on from 1.3 to 1.5 sec. (0.8 MW). Shut off the DNB to see if that was casuing problems. Results: Still didn't get early EDA. Instead we got an ELM-free H-mode and then a transition to an EDA (late). |
| Dec 14 2000 03:28:54:983PM | 1001214024 | Paul Bonoli | 1001214024 Request: Try loading shot from yesterday when we were getting good density barrier modes -> Load shot 1001213016 I_p = 800 kA, B_t = 4.5 T, nl_04 = 0.75 (target) D and E -port (80 MHz) turned on from 0.7 to 1.4 sec. (0.95 MW /port) J-port - on from 1.3 to 1.5 sec. (0.8 MW). Turn DNB back on. Results: We STILL got a delayed EDA H-mode with an ELM-free phase first. |
| Physics Operator Comments | |||
| Dec 14 2000 05:52:00:857AM | Steve Wolfe | Start from last shot from yesterday 1001213022. Change seg 2 title -> 0.8 MA, 4.5 T, diverted Load/Clean Coldstart all matrices respond 14-DEC-2000 05:51:04.42 | |
| Dec 14 2000 05:53:52:420AM | Steve Wolfe | Engineering Setup and Run Plan for Thursday, Dec 14 MP#277A Two freq heating and ITB Physics SL: Bonoli PO: Wolfe ** Run will start at 07:30 and end at 15:30 *** ECDC in D2 overnight, ending at least one hour before start of run Power systems as on 1001213001 Gas Setup: fill B-top with 6 psi of D2 Hybrid enabled fill B-side lower with 1 psi of Ar Hybrid enabled fill B-side upper with 35 psi of D2 Hybrid DISABLED, for ECDC fill C-side with 30 psi of D2 Hybrid enabled leave J-bot as is Hybrid DISABLED Enable the following gate valves: ECE, VUV, DNB RF Setup: XMTRs 1,2, and 4 should be made ready for operation by 7:00 Plan: We will continue with the two-frequency heating experiment from where it left off on Wednesday, and get as far as we can. | |
| Dec 14 2000 07:40:55:030AM | 1001214001 | Steve Wolfe | Shot#1: DNB will not fire on this shot. However, I'll leave Gas puff as is at 22msec. Reduce Ar puff from 50->30msec plasma, h-mode starts at 0.9sec, EDA. HIREX Jr signal looks very low? B-side lower was not enabled. RF looks clean up to 0.5MW, L-H at <0.4MW. NL4 is flat, core TS densities rising some; perhaps VH'ish? Next shot: enable Argon |
| Dec 14 2000 07:53:33:547AM | 1001214002 | Steve Wolfe | Shot#2: No PCS changes; enable Argon Plasma, h-mode starts at 1.0sec; had an injection at 0.8, but EDA phase looks good. Good signal on jr this time. RF ramps to 0.7MW. Any peaking of the density seems to be after the RF. TRAQ2 data corrupted, I'll have to run EFIT again with PCS data Next shot: no PCS changes |
| Dec 14 2000 08:10:45:280AM | 1001214003 | Steve Wolfe | Shot#3: No PCS changes, increasing RF power again. plasma, h-mode starts at .83 but ends at 1.09; RF tripped starting at L-H transition. Next shot: Move RCUR out to 0.672 from .5sec on, to flatten outer gap. |
| Dec 14 2000 08:24:31:827AM | 1001214004 | Steve Wolfe | Shot#4: Move RCUR out to 0.672 from .5sec on, to flatten outer gap. plasma, nice long h-mode from .83 to 1.56sec, EDA, Prad falling. RF to 0.9MW, with a few trips. OUter gap is pretty flat at ~0.75cm next shot: No PCS changes |
| Dec 14 2000 08:46:19:730AM | 1001214005 | Steve Wolfe | Shot#5: No PCS changes, raise power. plasma, h-mode from .72 to .94, then dithering after RF trip at .74, retries. Startup had a bounce outside, recovered. Data system hung; Josh not in yet. Next shot: DNB will open; no pcs change, since curent rise is getting too fast anyway. |
| Dec 14 2000 09:51:16:547AM | 1001214006 | Steve Wolfe | Shot#6: DNB will open; no pcs change, since curent rise is getting too fast anyway. An hour delay for data system hang. fizzle. runs outside, didn't make it. p0=.066, just like previous. next shot: raise pg4 by 3msec |
| Dec 14 2000 10:08:53:437AM | 1001214007 | Steve Wolfe | Shot#7: raise pg4 by 3msec to 25msec plasma, h-modes, rf faults slight hesitation, still moving out though not as much bd a little later this time? p0=.077 next shot: Increase rcur offset in seg1 from 5500 to 6500. |
| Dec 14 2000 10:24:23:013AM | 1001214008 | Steve Wolfe | Shot#8: Increase rcur offset in seg1 from 5500 to 6500. Try again for higher rf power, changing waveform plasma, hmodes, rf still faulting at high power (900kW), not at LH transition. less hesitation, doesn't move out as hard. next shot: try again |
| Dec 14 2000 10:44:27:997AM | 1001214009 | Steve Wolfe | Shot#9:No PCS changes; try again plasma, hmodes. disrupted in rampdown at 1.75sec. fast current rise, still moving out, but no hesitation; leave it alone. Same RF behavior, maybe a little worse. Next shot: Wukitch installing attenuators in power room. |
| Dec 14 2000 11:01:25:950AM | 1001214010 | Steve Wolfe | Shot#10:No PCS changes; try again plasma, full length, 2 h-modes, second (>1.1s)is strong eda. RF ramps to 1.05MW, with some faulting; seems better. p0 up to .085mTorr, outward motion small if any. smooth current rise. next shot: try for higher power. |
| Dec 14 2000 11:19:06:780AM | 1001214011 | Steve Wolfe | Shot#11:No PCS changes; try for higher power. plasma, rf faults at LH transition, retries to 1.1sec, dithering thereafter next shot: increase outer gap by 2mm |
| Dec 14 2000 11:39:28:937AM | 1001214012 | Steve Wolfe | Shot#12: increase outer gap by 2mm (rcur to .671) plasma, hmode to 1.2sec, then dithers. 0.9MW and faulting. next shot: move on, turn on D&E from 0.5sec, J-port late. |
| Dec 14 2000 11:57:11:297AM | 1001214013 | Steve Wolfe | Shot#13: move on, turn on D&E (80MHz) from 0.5sec, J-port(70MHz) late. plasma, h-modes, 2nd one is good eda. NO Peaking apparent on this shot (based on TS ne0) 1MW total from D&E. next shot: raise power. |
| Dec 14 2000 12:16:31:107PM | 1001214014 | Steve Wolfe | Shot#14: raise power. plasma, long eda h-mode, starting at .95 or so This one looks like it may peak up density, then heat the center (based on nl4, TS ne0, and neutrons) next shot: raise the power again. |
| Dec 14 2000 12:36:52:827PM | 1001214015 | Steve Wolfe | Shot#15: raise the power again. h-mode still delayed, a little earlier, less eda until J comes on. RF looks good at 2MW from D&E, .7 from J. Weak peaking if any, but J does double the neutron rate. next shot: repeat |
| Dec 14 2000 12:48:51:750PM | 1001214016 | Steve Wolfe | Shot#16:repeat plasma, h-mode at 0.91sec (same as 15) D&E clean, J has some faulting. next shot: 4.4T |
| Dec 14 2000 01:15:43:170PM | 1001214017 | Steve Wolfe | Shot#17: 4.4T (121 kA) plasma, later H-mode, 1 D-port fault, gives an H-L. less eda'ish, lower neutrons. More peaking,ECE cutoff. Big MHD at 1.2sec, seen on bolos and xray (and ECE before it gets completely cutoff) next shot: Extend tf to 1.5sec (was 1.4) |
| Dec 14 2000 01:44:27:030PM | 1001214018 | Steve Wolfe | Shot#18: Extend tf to 1.5sec (was 1.4) some delay for data system hang (JAS at lunch); it was the video storage; fixed. plasma, 2 h-modes, almost identical to 17. Doesn't look like it peaks this time no MHD this time either. |
| Dec 14 2000 02:05:18:200PM | 1001214019 | Steve Wolfe | Shot#19: Raise the D&E power. plasma, H-mode at .9, H-L at 1.05 (d faults and tays off), L-H at 1.117 No peaking. bd is getting a little late (6.8msec). next shot: Beam to 0.3, RF to 0.5sec (D&E) |
| Dec 14 2000 02:20:21:280PM | 1001214020 | Steve Wolfe | Shot#20: Beam to 0.3, RF to 0.5sec (D&E) plasma, h-modes at .58, disrupted at 1sec. BUSLV CAMAC failed; device not triggered. Store them manually. p0 went up to .095mTorr, due to DNB change? next shot: drop pg4 to 22msec; drop power back to 2MW |
| Dec 14 2000 02:38:36:340PM | 1001214021 | Steve Wolfe | Shot#21: drop pg4 to 22msec; drop DE power back to 2MW plasma, H-mode at .96 sec, elm free, then some faulting; eda during J-port p0=.085mTOrr, bd at 5.9msec, smooth current rise. next shot: 4.6T |
| Dec 14 2000 02:55:08:373PM | 1001214022 | Steve Wolfe | Shot#22: 4.6T (127KA) H-mode at 1.01sec . What is the matter. ELM free, neuts = 5e12, then eda with <2e12. Lose D at first H-L transition. next shot: turn off DNB. |
| Dec 14 2000 03:13:01:340PM | 1001214023 | Steve Wolfe | Shot#23:turn off DNB. No change, h-mode at 1.05sec. next shot: load seg 2 from 1001213016 |
| Dec 14 2000 03:30:45:560PM | 1001214024 | Steve Wolfe | Shot#24: load seg 2 from 1001213016; RF like that shot, except for J-port left on at 1.3sec H-mode at .93sec, i.e. late again. FOrst h-mode is ELM-free. No sign of peaking. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 07:32:09:967AM | Plasma | Ok | |
| 2 | 07:46:57:233AM | Plasma | Ok | |
| 3 | 08:01:50:640AM | Plasma | Ok | |
| 4 | 08:17:37:187AM | Plasma | Ok | |
| 5 | 08:33:48:107AM | Plasma | Ok | |
| 6 | 09:46:17:967AM | Plasma | Ok | |
| 7 | 09:59:29:827AM | Plasma | Ok | |
| 8 | 10:19:15:450AM | Plasma | Ok | |
| 9 | 10:36:42:513AM | Plasma | Ok | |
| 10 | 10:52:18:230AM | Plasma | Ok | |
| 11 | 11:11:21:387AM | Plasma | Ok | |
| 12 | 11:30:22:357AM | Plasma | Ok | |
| 13 | 11:47:53:107AM | Plasma | Ok | |
| 14 | 12:05:41:420PM | Plasma | Ok | |
| 15 | 12:25:45:217PM | Plasma | Ok | |
| 16 | 12:40:26:797PM | Plasma | Ok | |
| 17 | 01:02:26:590PM | Plasma | Ok | |
| 18 | 01:33:58:297PM | Plasma | Ok | |
| 19 | 01:53:29:733PM | Plasma | Ok | |
| 20 | 02:09:28:077PM | Plasma | Ok | |
| 21 | 02:29:12:467PM | Plasma | Ok | |
| 22 | 02:48:18:780PM | Plasma | Ok | |
| 23 | 03:09:40:437PM | Plasma | Ok | |
| 24 | 03:23:15:670PM | Plasma | Ok | |