| Miniproposals | ||||||||||
|
| Operators | |
| Session leader(s): | Darin Ernst |
| Physics operator(s): | Steve Wolfe |
| Engineering operator(s): | Bill Parkin,Bill Byford,Ed Fitzgerald |
| Engineering Operator Run Comment |
| MP#602 Core fluctuations and Transport in two-frequency ICRF-heated ITB |
| Session Leader Plans |
| Entered: Mar 22 2010 11:03:27:690AM |
| Author: Darin Ernst |
| coming soon - dernst@psfc.mit.edu |
| Entered: Mar 23 2010 06:40:28:050PM |
| Author: Darin Ernst |
| 1. Begin with 1100322007 but with 5.5 T 800 kA (TBD)
target density to nl_04 1x10^20 m^-2 J-port 2.5 MW LFS off-axis cryopump on, Ar puff Move RF 0.1 sec earlier as in 1100323005. 2. Try lowering current to 700 kA to get lower ne_ped. If have trouble getting ITB's, increase Ip to as much as 900 kA. 3. If successful, add D&E at 0.6 MW each with full on-off modulation (period TBD, i.e. 10 ms on, 10 ms off) starting at 1.1 - 1.5 sec, 50% duty cycle. If not successful, return to 800 kA. 4. Adjust D&E timing and modulation to optimize. 5. Increase D&E power to 1.6 MW each. 6. Decrease D&E power to 1.0 MW each. 7. Add vertical jogs 0.8 - 1.5 sec. (see below), turn off modulation. 8. Try jogs with modulation if time permits. 9. Thomson scattering calibration shots if time permits. Locked mode shot for HIREX Sr. Most desirable timing (alternatively, we can start DPCS jogs lasting 4 ms each at 0.811 s with a 29 ms flat top for asynchronous). The interval between YAG 1 pulses is 33.333333 ms. There are three YAG 1 pulses in 100 ms. 0.910253 s: YAG 1 0.911 s: begin vertical jog 0.915 s: end vertical jog YAG 1 +5ms: YAG 2 0.943586 s: YAG 1 0.944 s: begin vertical jog 0.948 s: end vertical jog YAG 1 +5ms: YAG 2 0.976918 s: YAG 1 0.977 s: begin vertical jog 0.981 s: end vertical jog YAG 1 +5ms: YAG 2 1.01025 s: YAG 1 1.011 s: begin vertical jog 1.015 s: end vertical jog YAG 1 +5ms: YAG 2 1.04359 s: YAG 1 1.044 s: begin vertical jog 1.048 s: end vertical jog YAG 1 +5ms: YAG 2 1.07692 s: YAG 1 1.077 s: begin vertical jog 1.081 s: end vertical jog YAG 1 +5ms: YAG 2 1.11025 s: YAG 1 1.111 s: begin vertical jog 1.115 s: end vertical jog YAG 1 +5ms: YAG 2 1.14358 s: YAG 1 1.144 s: begin vertical jog 1.148 s: end vertical jog YAG 1 +5ms: YAG 2 1.17692 s: YAG 1 1.177 s: begin vertical jog 1.181 s: end vertical jog YAG 1 +5ms: YAG 2 1.21025 s: YAG 1 1.211 s: begin vertical jog 1.215 s: end vertical jog YAG 1 +5ms: YAG 2 1.24358 s: YAG 1 1.244 s: begin vertical jog 1.248 s: end vertical jog YAG 1 +5ms: YAG 2 1.27692 s: YAG 1 1.277 s: begin vertical jog 1.281 s: end vertical jog YAG 1 +5ms: YAG 2 1.31025 s: YAG 1 1.311 s: begin vertical jog 1.315 s: end vertical jog YAG 1 +5ms: YAG 2 1.34358 s: YAG 1 1.344 s: begin vertical jog 1.348 s: end vertical jog YAG 1 +5ms: YAG 2 1.37692 s: YAG 1 1.377 s: begin vertical jog 1.381 s: end vertical jog YAG 1 +5ms: YAG 2 1.41025 s: YAG 1 1.411 s: begin jog 1.415 s: end jog YAG 1 +5ms: YAG 2 1.44358 s: YAG 1 1.444 s: begin vertical jog 1.448 s: end vertical jog YAG 1 +5ms: YAG 2 1.47691 s: YAG 1 1.477 s: begin vertical jog 1.481 s: end vertical jog YAG 1 +5ms: YAG 2 1.51025 s: YAG 1 1.511 s: begin vertical jog 1.515 s: end vertical jog YAG 1 +5ms: YAG 2 1.54358 s: YAG 1 1.544 s: begin vertical jog 1.548 s: end vertical jog YAG 1 +5ms: YAG 2 1.57691 s: YAG 1 1.577 s: begin vertical jog 1.581 s: end vertical jog YAG 1 +5ms: YAG 2 1.61025 s: YAG 1 1.611 s: begin vertical jog 1.615 s: end vertical jog YAG 1 +5ms: YAG 2 1.64358 s: YAG 1 1.644 s: begin vertical jog 1.648 s: end vertical jog YAG 1 +5ms: YAG 2 |
| Physics Operators Plans |
| Entered: Mar 23 2010 06:40:58:240PM |
| Author: Steve Wolfe |
| Physop Plan and Engineering setup for Wed, Mar 24, 2010
MP#602 Core fluctuations and Transport in two-frequency ICRF-heated ITB plasmas with jogs and modulated ICRH SL: Ernst PO: wolfe Overnight Prep: ---------------- Boronization (20% mix, 60psi deposited) Standard 20% prescription: TC6 ~ 50mTorr, rmin/rdwell/rmax: 44/52/103 cm tdwell/tsweep: 60/120 s EF4 current: 0 A Post boronization ECDC ---------------------------- 1st Gas Setup: Gas: He sweep: 44/103/45 cm scan: 20/120 s Pressure: 5e-5 Torr Duration: 2hrs 2nd Gas Setup Gas: D2 sweep: 44/103/45 cm scan: 20/120 s Pressure: 2e-4 Torr Duration:1hr ----------------- Engineering Setup ----------------- Run begins at 09:00 and ends at 17:00 Power systems as on: 1100323005 Acoil: +Dtop -Dbot -Jtop +Jbot (standard) Hybrid Enabled Gas setup: Fill B-Top with 6 psi D2 Hybrid enabled (PG4) fill B-side lower with 1 psi Ar Hybrid Enabled (PG1) leave B-side upper as is Hybrid DISABLED (PG2) fill B-main (C-side) with 40 psi D2 Hybrid enabled (PG3) leave H-bottom as is (pumped out) DISABLED (PG5) fill NINJA with 10 psi D2 DISABLED Enable gatevalves and shutters: ECE, VUV, HiREX Sr, Z-bolo, B-spectrometer Torvac gatevalve toggle (yes/no): no Boronization(yes/no): Yes Overnight ECDC (yes/no): Yes ICRF(yes/no): Yes (D,E, and J) LH(yes/no): no Cryopump (yes/no): Yes (ready for first shot) Vessel temperature: 35/35/35 --------------------------------- Physop Plan: (to be edited) -------------- 1. Start from whatever 1100322005, Change Ip to 800kA, nl04 to 1e20. RF should move 100msec earlier (start at 0.7sec). Probably modify startup? Run a few shots for boronization recovery before proceeding 2. Decrease Ip to 700kA to try to lower ne_ped. If this doesn't work, try increasing to 900kA. 3. Add D&/or E at total 1.2MW, modulated, starting at 1.1-1.5sec Possibly go back to 800kA, if we aren't there already 4. Adjust on-axis timing and modulation, hopefully no DPCS changes needed in this step 5. Increase on-axis power to max available 6. Decrease on-axis power to complete power scan 7. Add vertical jog modulation (with RF modulation) Start with ModStart = 0.811 (or after start of H-mode), period=.067, duration=.680 RampUp = .004, RampDown=.005 ModMax=-.01, ModMin=0., DutyCycle=.50 Adjust if necessary to optimize relation to Yag pulses at [.810253,.81523]+N/30. Adjust Max and Min to avoid going USN, putting too much power on W tiles, losing ITB. Keeping this much perturbation from killing the ITB is likely going to be the most important. Probably don't want to spend too much time optimizing this. 8. If time and nature permit, put back RF modulation at some compatible period. 9. Thomson scattering calibration (cut-off shot). Need a sample shot to base this on. 10. If requested, locked mode calibration shot for HIREX_SR, e.g. 1100316030 seg 4. |
| Session Leader Summaries |
| Entered: Mar 24 2010 09:46:44:120PM |
| Author: Darin Ernst |
| Given the limited time, and two afternoons plagued by tungsten injections in
the preceding two days, we decided to proceed agressively. If a set of parameters didn't work, we agressively changed them to reduce wall loading. This was hit and miss, but we were able to avoid ELM-free H-modes through small increases in target density and current. A computer problem prevented data access until 9:52 AM: LDAP server was down. First shot 10:33 AM. Overall, we obtained three strong ITB cases with central densities reaching 5.0e20 m^-3, and successfully arrested two ITB cases with modulated on-axis ICRH, maintaining the same central density. There were a couple of other interesting cases with too much on-axis heating. We used a 50 ms on, 50 ms off modulation in the best cases 019, 020, for which Te at the edge lagged Te on-axis by 5 ms. Total rise time is about 17 ms for Te0, producing a 0.5 keV excursion in Te0, to reach 1.9 keV. Pedestal densities were in the range of 2.0 - 2.5e20 m^-3. There was not enough time available to reduce the H-mode pedestal density significantly for reflectometry access to the ITB. Operation at lower currents and densities suffered from tungsten injections and ELM-free onset. The cyropump may have helped with recovery from overnight boronization, as thought during the last few days. We found that the vertical jogs could in fact be done synchronously with the YAG 1 TS laser. Even though DPCS allows only integer numbers of ms, the period is retained as a floating point number. However, the 60 Hz jog frequency required could be resonant with EF power supplies, creating havoc. Jogs overshot and were unsuccessful in the two attempts we made. Further development is needed. HIREX Sr., ECE systems, PCI, Thomson scattering, reflectometry, and cyropump were operational. The DNB was not operational. Radiated power suffered from pickup from J-port. Given the 100 ms time constant, radiated power measurements are possible at the end of the H-Mode phase. Core thomson densities were calibrated to ECE cutoffs by Yunxing two days ago. The edge thomson will be calibrated to the core and Rayleigh scattering by Jerry. In this experiment, J-port was operational up to 3.0 MW at 70 MHz, and D-port up to 1.6 MW at 80 MHz. E-port was available intermittently, but not needed. The next step is to look for signs of increased fluctuations in PCI during the on-axis heating, as in 1040323033. I would especially like to thank Catherine Fiore, Arturo Dominquez, Steve Wolfe, Yunxing Ma, Jerry Hughes, Naoto Tsujii, Matt Reinke, Amanda Hubbard, Steve Wukitch, Martin Greenwald, and Yuri Podpaly for their help. Interesting shots: shot nel04_tgt Ip ne0 ne_ped TOI (s) Pon-axis Comment 1100324002 0.8 0.8 5.0 2.5 1.213 none Rad. collapse @ 1.22s 1100324003 0.8 0.7 5.0 2.5 1.213 none Rad. collapse @ 1.24s We tried lowering the the target density to 0.7 to get lower ne_ped for reflectometry, but got an ELM-free H-mode. So we returned to nl04_tgt=0.8. We also returned to 0.7 MA, since 0.8 MA did not give as clear an ITB foot. 1100324006 0.8 0.7 4.0 1.166 >1.15 s, 15/15 ms on/off, peak 1.2 MW Appears to arrest at ne0=4 instead of 5. Probably terminated by impurity injection. Move on-axis power earlier and reduce power. We tried D-port 1.0 MW 30 ms on 30 ms off, starting 1.0 sec. This was still too strong to allow significant peaking. We reduced the duty cycle to 40 ms off, 20 ms on. Tungsten injections were becoming more frequent, so we raised the target density to nl04_tgt=0.9 to try to make more robust H-modes. 1100324010 0.9 0.7 3.4 all >1.0 sec, 20/40 ms on/off, peak 1.0 MW Nice long duration weak ITB, density falls steadily during on-axis heating. This was almost what we wanted, but the ratio of on/off axis heating powers is too large, and kept the central density from rising strongly. In fact there was a strong and very interesting overall density pumpout during on-axis heating. To counter this, we tried raising the off-axis J-port power to 3.0 MW. Three attempts were all multiple H-Modes terminated by tungsten injections. We also tried to no avail jogging the strike point up after the H-mode transition to get away from the damaged tile, as suggested by Matt Reinke. The three terminated H-modes seemed to point to the need to reduce the time-integrated power to the tile. So, we returned the J-port power to 2.5 MW. Given the strong pumpout in shot 10, we delayed the on-axis D-port power to 1.1 sec. The resulting discharge had two H-modes, with the first terminated by an impurity injection from the J-port antenna. The second had a weak ITB. So to reduce loading on the J-port antenna due to orbit loss, we increased the current to 0.8 MA. This resulted in a nice, long duration H-Mode with steady ITB, ne0=3.5, ne_ped ~ 2.7. There were two impurity injections during H-mode. 1100324015 0.9 0.8 3.5 2.7 all >1.1 sec, 30/30 ms on/off, 0.8 MW peak To observe trapped electron modes, we believe we need stronger density gradients. So we delayed the on-axis power to 1.2 sec. To help avoid tungsten injections, we moved the J-port off-axis power 100 ms earlier, to start at 0.6 sec., just after flat-top begins. My thinking was to reduce the time-integrated power to the tile by getting the shot underway as quickly as possible. This was met with a fizzle and a four H-Mode case, the first 2 or 3 ELM-free, terminated by radiation collapse. The third was terminated by impurity injection. So we returned to starting J-port at 0.7 sec instead of 0.6 sec, and further delayed D-port to 1.3 sec, but increased D-port power to observe stronger Te0 modulation. 1100324018 0.9 0.8 4.0 <1.54s >1.3 sec, 30/30 ms on/off, 1.5 MW peak This was the best so far with on-axis heating, but still had too much on-axis power. The ITB Extends to 1.54 sec, but then begins to fall on the first on-axis pulse. To allow more time for the slow density peaking, we delayed the rampdown by 100ms to 1.6 sec., and started on-axis heating from D-port later at 1.45 sec. We extended the RF heating phase to 1.6 sec. as well. This produced our best case, a nice, long duration ITB, strongly peaked, and successfully arrested with on-axis heating to maintain a steady state ITB. There are two 50 ms on-axis heating pulses that clearly modulate Te0. *1100324019 0.9 0.8 5.0 <1.64s >1.45s 50/50 ms on/off, 1.0 MW peak. On-axis pulses maintain steady ITB. Next I decided to try 700 kA for stronger peaking. This produced another great shot, but interestingly, Te0 cools starting at 1.30 sec, at the same time the density rise ceases, and is then reheated by the RF pulse at 1.45 sec. *1100324020 0.9 0.7 5.0 <1.70s >1.45s 50/50 ms on/off, 1.0 MW peak. Density constant 1.30-1.45 sec, then falls during on-axis heating. Prad is flat. We then changed the on-axis RF modulation to 20 ms on, 20 ms off, starting 1.35 s, with peak power 0.8 MW. This produced a nice, but short-lived ITB, terminating at 1.30 sec, likely due to radiative collapse. 1100324021 0.9 0.7 5.0 <1.30s Terminated by radiative collapse. Moving the on-axis heating earlier to 1.2 sec, with 0.8 MW peak prevented the density from rising significantly, resulting in a weak ITB. 1100324022 0.9 0.7 >1.20s, 20/20 ms on/off, 0.8 MW peak. Weak ITB. Too much on-axis power too early. We then tried to repeat shot 019 with vertical jogs, starting at 0.877s, with 4ms rise, staying in phase with TS, which has 5 ms delay from YAG 1 to YAG 2. This resulted in two shots with early disruptions. |
| Physics Operator Summaries |
| Entered: Mar 25 2010 08:39:32:617AM |
| Author: Steve Wolfe |
Physics Operator Summary for Wednesday, Mar 24, 2010
MP#602
SL: Ernst
PO: wolfe
EO: Parkin, Byford, Fitzgerald
The run started late due to a computer meltdown involving a hang on
Alcdaq2 and failure of the LDAP server (?) on SV4. This was corrected
by Josh, assisted by twf, mrl, and fjk, by around 10:15. There were
some additional computer related glitches early in the day, and problems
with FMIT#2 continued. However, the tokamak ran quite well, considering
we were putting power on the tungsten row, and J and D were all that
were needed from the RF and they also ran reliably. We got a surprising
amount of the run plan done.
Boronization recovery was again very quick only a couple of shots to
get the RF going full out. The combination of the 20% bottle and
cryopump seems to be favorable, no idea why, or whether the cryopump
is really a necessary component; the experience from Catherine's first
run is the only evidence that it might be.
We started from a variant of 1100322007 (higher current), then dropped
back to 700kA which would make it a clone. We were getting ITB's as early
as shot#3. Some tweaking around with density (down to .7, up to .9), and
current (back up to .8MA) produced several very nice target plasmas
with long-lived ITB/EDA with and without modulated central RF, which
did seem to arrest the peaking. Raising nl04 seemed to be good, with 9e19
a suitable target at both 700 and 800kA. Amazingly, shots later in the
day seemed to be better in terms of impurity/tungsten problems than early.
Good shots included #10, 15, 18, 19, and 20. At shot#19 we extended the
flattop to 1.6sec to let the ITB develop more before turning on the
central modulated heating. #18,19 were at 800kA, #20-22 at 700kA. Either #19
or 20 could qualify as trophy shots. #21 and 22 were trying to chase the
ITB with earlier central heating and different mod frequency, but the plasma didn't cooperate, giving inconsistent peaking rates that frustrated
the intended interventions, though some good data are probably present.
See SL summary for more details.
On shot#23 I tried setting up the vertical jogs for scanning the plasma
past the TS channels, with the YAG1 and YAG2 staggered to fire 5msec
apart. I had previously run simulations that seemed to indicate that
a -1cm mod amplitude would be stable, but the simulations used a period
of .060sec, rather than the correct value of .0667 (15 Hz) to match
the TS lasers. The shot disrupted vertically on the second cycle,
having railed the chopper current and the EF2L voltage on the preceding
half-cycle, with an initial excursion of ~2cm. I think probably the
15Hz modulation was coupling to the 60Hz EF2's, which always have a lag,
and driving a vicious instability. I tried cutting back to -.004 amplitude
for shot#24, but it gave a post-disruption 5 o'clock fizzle.
Runaways weren't too bad but the startups never looked good, except for
a couple of shots (19,20) after I had raised the pg4, increased EF4
and set BR_0 from 0 to .0005. Bounces came back on shot#21 though.
Starting around shot#16 or so, the NINJA was allowed to fire late in the
shot to take advantage of some natural R modulation with the central heating
A little later (#17) we extended the RF to 1.6 and started ramping the
TF down at 1.5 to allow Ted Golfinopolous to look at variation in
some alfvenic modes that were showing up during the EDA/ITB. We put the
TF rampdown back to 1.6 for shot#19, but the RF extended out to 1.7sec
so he may have gotten something useful.
We had a couple of early disruption/"fizzles" on #9 and 16, both apparently
flakes falling in. Neither of these looked like the runaway disruptions
we've been having lately. Shot#24 was a classic post-disruption fizzle,
which might have been avoided if I had dropped the pg4 by 10msec. Aside
from these, and a no-power shot#4, all plasmas ran full length until the
disruption on #23 due to the vertical kicks.
Scorecard:
---------
No Power 1 (crit init on FFT DIO2 init)
Duds 0
Fizzles/current rise disrupt 3
Plasmas 20
--------------- --
Shots 24
|
| Session Leader Comments | |||
| Mar 24 2010 10:33:59:570AM | 1100324001 | Darin Ernst | RF badly glitching, got a few H-Modes, about six.
|
| Mar 24 2010 11:07:48:893AM | 1100324002 | Darin Ernst | Decent ITB, ne0=5, neped=2.5 at 1.213 sec. Drop current to 700 kA to reduce
ne_ped. E-port working (not used). 2.5 MW from J-Port 70 MHz. |
| Mar 24 2010 02:53:38:327PM | 1100324003 | Darin Ernst | Very nice ITB, ne0=5, ne_ped ~ 2.5 (bounces around), well defined ITB foot
at ~77 cm. The lower current seemed to narrow the ITB. Try to lower target density to 0.7 to get lower ne_ped for reflectometry. Clear impurity accumulation seems to have terminated this ITB, similar to last shot, at around 1.236 sec. However, Prad_AXUV did not increase, but apparently distribution of Prad changes. Sawteeth going away toward end of ITB. TS was set with 3 ms YAG2 - YAG1 interval for shots 2,3. Sawtooth period during ITB is 6 ms, amplitude 0.16 keV |
| Mar 24 2010 12:09:51:183PM | 1100324005 | Darin Ernst | ELM-free H-Mode. This target density is too low. NEXT: 0.6 MW on-axis heating.
E not avail.; D-port 80 MHz at 1.15 s, 15ms on, 15ms off, peak power 1.2 MW. Lowering nel04 to 0.7 gave ELM-free H-mode, so return to nel04 of 0.8. Raising Ip to 0.8 MA did not give a clear ITB foot, so keep 0.7 MA. We might consider 0.75 MA later on to fatten the ITB. |
| Mar 24 2010 12:27:29:533PM | 1100324006 | Darin Ernst | Good ITB, ne0=4. Terminates about same time, but on-axis power seemed to
arrest density at 4 instead of 5 on-axis. Termination does not appear to be due to radiative collapse. No sign of on-axis modulation in edge Te, but core Te appears to follow (along with sawteeth). NEXT: Move on-axis power earlier and reduce power. Start D-port 1.0 MW 30 ms on 30 ms off, starting 1.0 sec. |
| Mar 24 2010 12:54:14:763PM | 1100324007 | Darin Ernst | Two H-Modes, first one terminated by a W impurity injection.
First one had no ITB before it got zapped. Second one did not peak either. Modulation shows clearly on Te0, producing swings from 1.62-2.24 keV, on top of sawtooth swings 1.7-2.1 keV. Modulation flat top is about three sawtooth periods. NEXT: repeat with modulation 40 ms off, 20 ms on. |
| Mar 24 2010 01:02:51:890PM | 1100324009 | Darin Ernst | Fizzle. Steve suggests raising target density from 0.8 to 0.9 next shot
to try to avoid the tungsten. |
| Mar 24 2010 01:29:17:853PM | 1100324010 | Darin Ernst | Extended H-Mode with no strong impurity influx. Weak ITB reaching
neo=3.4, but both core and pedestal density decrease with time starting at 1.0 sec., coinciding with on-axis power. Had 2.5 MW from J-port. Almost what we want, but the ratio of on-axis to off-axis power is too high. HIREX SR. using 10ms interval, starting -0.0969000 sec. Profiles should be useable. Steve says modulation producing 2.5mm p-p edge position changes, RE: E. T. Putterich desiring puffs. NEXT: Increase J-port to 3.0 MW. |
| Mar 24 2010 01:26:26:743PM | 1100324011 | Darin Ernst | Late H-mode. RF power increase wasn't loaded, still 2.5 MW from J-port.
No TS this shot. No sign of density rise. |
| Mar 24 2010 01:38:29:827PM | 1100324011 | Darin Ernst | Late H-Mode. Had early impurity injections.
No TS this shot. |
| Mar 24 2010 01:46:46:440PM | 1100324012 | Darin Ernst | Two H-Modes. Weak ITB during first with ne0=2.8. Terminated
by W injection? Try jogging strike point up after H-mode forms to avoid W, as suggested by Matt. |
| Mar 24 2010 01:54:09:520PM | 1100324013 | Darin Ernst | Four H-modes. Jogging strike point didn't work. We will extend RF 100ms
into rampdown to observe Alfven modes while the magnetic field changes. |
| Mar 24 2010 02:02:39:913PM | 1100324013 | Darin Ernst | Four H-modes. Terminated by W injections. Jogging strike point didn't work.
We will extend RF 100ms into rampdown to observe Alfven modes while the magnetic field changes. NEXT: Reduce J-port to 2.5 MW, reduce D-port to 0.8 peak, 30ms on 30ms off, starting 1.1 sec. Trying to reduce the W influx problem. GOAL: Strongly peaked ITB with steady ne0 and strong, modulated on-axis RF. |
| Mar 24 2010 02:28:15:987PM | 1100324014 | Darin Ernst | Two H-modes, first terminated by impurity injection from J.
Second shows an ITB. ne0=3.3, ne_ped~ 2.0. NEXT: Increase Ip to 800 kA to try to avoid particle losses to J. |
| Mar 24 2010 02:55:14:640PM | 1100324015 | Darin Ernst | Nice, long duration H-Mode with ITB, ne0=3.5, ne_ped ~ 2.7, steady.
Want a stronger ITB. Two impurity injections during H-mode. On-axis power coming in at 1.1 instead of 1.2 sec. Maybe the higher current helped. Want higher ne0. NEXT: Delay on-axis power to 1.2 sec, increase peak power to 1.5 MW from 1.0 MW, 30 ms on, 30 ms off. Move J-port off-axis power to start 100 ms earlier, at 0.6 sec. Want to get the shot underway as quickly as possible to reduce time-integral of power to the bad tile. |
| Mar 24 2010 02:47:22:760PM | 1100324016 | Darin Ernst | Fizzle.
|
| Mar 24 2010 03:12:36:393PM | 1100324017 | Darin Ernst | Four H-modes, first 2 or 3 ELM-free, terminated by radiation collapse.
Third terminated by impurity injection. NEXT: Go back to J starting at 0.7 instead of 0.6 sec., start D at 1.3 sec., 30 ms on, 30 ms off, 1.5 MW peak. |
| Mar 24 2010 03:31:17:980PM | 1100324018 | Darin Ernst | Best case so far with on-axis heating. Too much on-axis power.
ITB Extends to 1.54 sec., on-axis density reaches 4 and begins to fall on first on-axis pulse. Want more peaking. NEXT: Start rampdown at 1.6 sec, Start D later at 1.45 sec. Make D 50ms on, 50 ms off, 1 MW peak. Extend RF to 1.6 sec. |
| Mar 24 2010 03:43:59:703PM | 1100324019 | Darin Ernst | Good long duration ITB, ne0=5, on-axis power successfully arrests with
two pulses starting at 1.45 sec, maintains steady ITB. Best case so far. NEXT: Try 700 kA for better peaking. |
| Mar 24 2010 04:06:00:570PM | 1100324020 | Darin Ernst | Another nice long duration ITB. Good peaking up to 1.3 sec, reaching
ne0=5, then Te begins to drop, and density stops rising. Flat out to 1.45 sec, then core density drops with on-axis heating. Prad is flat. Great shot. Te at the edge responds 5 ms after Te at the core. Rise time is about 17 ms for Te0. Te0 begins to fall at 1.30 sec. NEXT: Change on-axis RF modulation to 20 ms on, 20 ms off, starting 1.35 s. Peak power 0.8 MW. |
| Mar 24 2010 04:17:51:403PM | 1100324021 | Darin Ernst | Great ITB with neo=5, but H-mode terminated at 1.30, likely due to radiative
collapse. Z-meter shows it. No obvious impurity injections. Neutron rate started to fall at 1.17 sec. NEXT: Try on-axis heating at 1.2 s, 20 ms on, 20 ms off. 0.8 MW peak. |
| Mar 24 2010 04:37:15:740PM | 1100324022 | Darin Ernst | Very weak ITB, just too much on-axis power too early.
NEXT: Repeat shot 019 with vertical jogs, starting at 0.877s, with 4ms rise, staying in phase with TS, which has 5 ms delay from YAG 1 to YAG 2. |
| Mar 24 2010 04:58:35:717PM | 1100324023 | Darin Ernst | Steve says the supply railed on the jog. Try it again, but with less feeling.
NEXT: Repeat shot 019 with vertical jogs, starting at 0.877s, with 4ms rise, staying in phase with TS, which has 5 ms delay from YAG 1 to YAG 2. |
| Mar 24 2010 05:03:50:000PM | 1100324024 | Darin Ernst | Disruption early. Steve thinks the jogs, being locked to thomson
60 Hz, are resonant with the power supplies -> unstable. Rethink the jogs. NEXT: Very modest bragging. Thanks to all for your fantastic help. Looking forward to extensive post-mortem analysis. |
| Physics Operator Comments | |||
| Mar 24 2010 07:13:05:953AM | Steve Wolfe | Trying to get setup for Wednesday's run. The workstations at the front desk seem to be hosed; possible network problem. Emailed Josh and Brandon. Working temporarily from cmodws57. Boronization ran late and He ECDC is still going. Instructed Dave to proceed with D2 ECDC, but cryo cannot start until ECDC is done, so we will probably be late getting started. I don't want to shorten D2 ECDC beyond one hour. | |
| Mar 24 2010 07:30:11:413AM | Steve Wolfe | Trying to load 1100322005 into PCS and it hangs. Alcdaq2 seems to be hung. I can't ssh to it. Josh and Tom notified by email, will wait to phone for a while. Logbook entries very slow but seem to go through. | |
| Mar 24 2010 09:00:06:930AM | Steve Wolfe | We are having a delay for a computer problem. No estimated uptime yet. | |
| Mar 24 2010 09:51:05:613AM | Steve Wolfe | Things are freeing up, at least temporarily. I have now got the 1100322005 loaded into pcs. Start making changes: Ip from 700kA to 800kA Darin no longer wants to raise the density, so leave it at 8e19 Confirm that TF_CURRENT is -150700 which should give 5.5T PG1 is at 70msec. Turn off dpcs_piezo_chopper PG4 is at 52msec; leave for first shot, change after Try loading it Load at 24-Mar-2010 09:50:54.00 | |
| Mar 24 2010 09:57:22:850AM | Steve Wolfe | Moving back to cmodws50 after reboot | |
| Mar 24 2010 10:23:17:893AM | 1100324001 | Steve Wolfe | I may have loaded from the wrong shot. Try again load from 1100322007 (may have used 5?) Change current from 700 to 800kA, turn off dpcs_piezo_chopper Load at 24-Mar-2010 10:09:58.00 Shot#1: plasma full length multiple H-modes. Amazing it actually ran after all that! May be some delays in updates and/or analysis jobs? Coming through now. J looks scruffy, D on for a short clean pulse, no E. Bouncy looking startup, but no runaways, and pressure rises after breakdown. Next: repeat, let boronization recovery progress. |
| Mar 24 2010 10:40:53:993AM | 1100324002 | Steve Wolfe | Shot#2: No DPCS changes, rf working on E (still no gate) plasma full length, two h-modes, first one looks promising. Not a whole lot of peaking, probably some. L-H at .755sec, H-L at 1.21, near RF fault. Not sure which comes first E ran that time, FFT may still not be triggering? Next: Drop Ip back to 700kA |
| Mar 24 2010 11:19:55:087AM | 1100324003 | Steve Wolfe | Shot#3: Drop Ip back to 700kA Load at 24-Mar-2010 10:41:33.00 Delay for pcdaqeng1 problem, followed by rf monitor problem plasma full length, h-modes, still a fault around 1.23sec Sawteeth go away, and a little bit of cut-off following the H-L Soft xrays are climbing but prad_axa is not. Zave is. Decent ITB-like profile with well-defined foot. SL wants to get lower ped density, but may settle. Next: ? |
| Mar 24 2010 11:27:59:730AM | 1100324004 | Steve Wolfe | Shot#4: Decrease nl04 from .8 to .7e20 Load at 24-Mar-2010 11:22:03.00 SHould have increased the pg4 puff, but didn't. Delay in init, finally freed up after 3minutes Critical failure in init. Take the no-power shot, get Josh back. |
| Mar 24 2010 12:04:39:917PM | 1100324005 | Steve Wolfe | Shot#5: Increase pg4 from 52 to 55msec relative to shot#3: Decrease nl04 from .8 to .7e20 Load at 24-Mar-2010 11:35:37.00 Delay while RF guys poke at the FFT cpci E and FFT will be off this shot. Rebooted pcdaqdpcs2 (twice) It complained about dio2 configuration, seemed to find acq32 on second reboot. plasma full length, data came in faster. One short H-mode early, Looks like elm-free? Next: Back to 0.8e19, turn on central heating |
| Mar 24 2010 12:23:18:970PM | 1100324006 | Steve Wolfe | Shot#6: Back to 0.8e19, as on #3 turn on central heating (D a 1.2MW, modulated) Load at 24-Mar-2010 12:05:56.00 plasma full length 2 h-modes similar to #3, ITB D comes on too late, hardly makes it before the H-L. ITB not as good? Next: Change modulation timing |
| Mar 24 2010 12:32:46:647PM | 1100324007 | Steve Wolfe | Shot#7: Change modulation timing (earlier, slower, less power) No DPCS changes. plasma full length, 2 h-modes, first one shot, second through EOF First H-L before modulation, looks like an injection; Tungsten? Next: repeat and hope injection goes away (or at least later) |
| Mar 24 2010 12:42:59:320PM | 1100324008 | Steve Wolfe | Shot#8: repeat and hope injection goes away (or at least later) E will try during cycle again, after two successful test shots. No DPCS changes plasma full length, some small early hards (again), short early H-mode doesn't recover. Next: raise nl04 to 9e19, hoping to reduce W influx. |
| Mar 24 2010 12:55:49:983PM | 1100324009 | Steve Wolfe | Shot#9: raise nl04 to 9e19, hoping to reduce W influx. Load at 24-Mar-2010 12:44:42.00 Early disruption/fizzle, .03sec 100kA. injection/bounce Next: raise pg4 |
| Mar 24 2010 01:17:54:740PM | 1100324010 | Steve Wolfe | Shot#10: PG4 from 55 to 60msec EF4 from -1330 to -1310; note rcur offset is at 2000 still with raised nl04 to 9e19, hoping to reduce W influx. Load at 24-Mar-2010 12:58:10.00 plasma full length, but not steady. Runaways early, 4e13, bad bounce but survives. One long H-mode, decreasing nl04 and prad. Good rf, nice clean modulation Is there an ITB, and if not why not? SL thinks it is a weak one. Next: decrease on-axis power, raise pg4 |
| Mar 24 2010 01:31:11:950PM | 1100324011 | Steve Wolfe | Shot#11: PG4 from 60 to 65msec Load at 24-Mar-2010 13:19:17.00 Raise J-port power plasma full length, early runaway burst single H-mode, late around 1.25sec Higher power on J didn't get loaded, still at 2.5MW, shot#10 must have been very marginal. Next: really raise J power |
| Mar 24 2010 01:41:58:800PM | 1100324012 | Steve Wolfe | Shot#12: really raise J power No dpcs changes, although the startup on 11 was still shaky plasma full length, runaways down a lot H-mode dies at 1sec, then two more late. I'm guessing W Try moving the strike point up around 0.8sec, see if we can get it off the W before it kills us. |
| Mar 24 2010 01:57:03:913PM | 1100324013 | Steve Wolfe | Shot#13: Try moving the strike point up around 0.8sec, see if we can get it off the W before it kills us. ZXL from 0 to .015, RXL form -.0025 to -.007 Load at 24-Mar-2010 13:47:37.00 plasma full length, but lots of short H-modes. May have moved rxl in too much, trying to keep the triangularity. Next: put rxl,zxl back where it was and lower power? |
| Mar 24 2010 02:16:08:717PM | 1100324014 | Steve Wolfe | Shot#14: put rxl,zxl back where it was (-.0025,0.) and lower J power, change D-port mod Load at 24-Mar-2010 13:59:30.00 Two h-modes, early and late. Lots of radiated power in the first one injection during the second doesn't kill it Some peaking during second H-mode Still very bouncy startup, but runaways are not bad. Next: decrease D power, increase pg4 again |
| Mar 24 2010 02:37:43:083PM | 1100324015 | Steve Wolfe | Shot#15: increase pg4 again, from 65 to 70msec raise Ip from 700 to 800kA Load at 24-Mar-2010 14:20:08.00 plasma full length long eda phase, into modulation, ends 1.4 or so. Modulation seen on neuts. Runaways at 1.5e13 level, still bouncing in startup Peaking arrested? during D mods. Next: Change central rf timing later and raise power to 1.5MW |
| Mar 24 2010 02:51:39:247PM | 1100324016 | Steve Wolfe | Shot#16: Change central rf timing later and raise power to 1.5MW start J at .6sec No DPCS changes Early disruption. 300ka, something falls in at .05sec. No runaways just a brick. Might be moving vertically before it hits or gets hit? Next: no startup changes. Move TF rampdown from 1.6 to 1.5sec for Ted G to look at his alfvenic modes during TF ramp (thought it already was at 1.5). |
| Mar 24 2010 03:08:32:910PM | 1100324017 | Steve Wolfe | Shot#17: no startup changes. Move TF rampdown from 1.6 to 1.5sec for Ted G to look at his alfvenic modes during TF ramp (thought it already was at 1.5). Relative to #15: Change central rf timing later and raise power to 1.5MW start J at .6sec Load at 24-Mar-2010 14:53:31.00 plasma full length, multiple H-modes. First H-mode at .65sec looks ELM-free Runaways ~1e13, bounce in startup. Heating up the W again (today's code is ORANGE) Next: Delay RF to 0.7sec, mod to 1.3sec |
| Mar 24 2010 03:45:04:220PM | 1100324019 | Steve Wolfe | Shot#19: Br_0 offset from 0 to .0005 (because I think it's wrong, not that it will matter to the bounce) Extend current and TF flattop to 1.6sec Load at 24-Mar-2010 15:31:05.00 D delayed to 1.45 Long h-mode through EOF, looks promising, Prad pretty constant. SL says best one so far. No bounce in startup, maybe it did do something Next: Drop Ip to 0.7MA |
| Mar 24 2010 04:01:06:130PM | 1100324020 | Steve Wolfe | Shot#20: Drop Ip to 0.7MA Load at 24-Mar-2010 15:44:06.00 Long EDA H-mode, ELMy things after 1sec Peaking up nicely. May be a new best one of the day. Loses sawteeth at 1.3sec, well before D comes on Prad comes down and stays down. W row has heated up (brown), but no obvious injections Next: change modulation on axis |
| Mar 24 2010 04:18:10:530PM | 1100324021 | Steve Wolfe | Shot#21: change modulation on axis No DPCS changes H-L at 1.3sec, density peaking faster this time, didn't last to the central heating time. Modulations are in the second H-mode. big bounce in startup is back, so much for the Br tweak. Next: move mod central heating earlier |
| Mar 24 2010 04:25:37:673PM | 1100324022 | Steve Wolfe | Shot#22: move mod central heating earlier Long H-mode phase, density drops after 1.2sec, Not as peaked as one might hope . Runaways 3e13, still bouncing. Next: vertical jogs |
| Mar 24 2010 04:50:10:260PM | 1100324023 | Steve Wolfe | Shot#23: vertical jogs starting at .877sec Period=.0667, duration .72, Rise/fall=.004 ModMax=0.01, ModMin=0., duty=.5 Raise Ip from 700 to 800 Load at 24-Mar-2010 16:37:28.00 Plasma disrupts at .92sec, early in the vertical jogs Rails EFC on the first reverse jog. Also voltage rails EF2L. Next: decrease mod amplitude a lot |
| Mar 25 2010 08:51:56:153AM | 1100324024 | Steve Wolfe | Shot#24: decrease modMax from -.01 to -.004 Load at 24-Mar-2010 16:51:57.00 I didn't simulate the 15.0Hz modulation, I think it may be coupling to the EF2's, which run off the mains. This is probably a bad idea, but it's the last shot of the day anyway. Fizzle.Needed to drop the fill, looks like a lot. END OF RUN. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 10:16:27:983AM | Plasma | Ok | |
| 2 | 10:33:02:490AM | Plasma | Ok | |
| 3 | 11:07:32:830AM | Plasma | Ok | |
| 4 | 11:26:19:307AM | Plasma | Bad | Critical Failure |
| 5 | 11:57:25:570AM | Plasma | Ok | |
| 6 | 12:10:37:370PM | Plasma | Ok | |
| 7 | 12:25:28:360PM | Plasma | Ok | |
| 8 | 12:38:32:553PM | Plasma | Ok | |
| 9 | 12:52:31:793PM | Plasma | Ok | |
| 10 | 01:05:51:770PM | Plasma | Ok | |
| 11 | 01:21:19:650PM | Plasma | Ok | |
| 12 | 01:35:12:233PM | Plasma | Ok | |
| 13 | 01:49:36:630PM | Plasma | Ok | |
| 14 | 02:05:21:370PM | Plasma | Ok | |
| 15 | 02:24:33:720PM | Plasma | Ok | |
| 16 | 02:42:57:960PM | Plasma | Ok | |
| 17 | 02:55:48:043PM | Plasma | Ok | |
| 18 | 03:12:07:300PM | Plasma | Ok | |
| 19 | 03:33:39:480PM | Plasma | Ok | |
| 20 | 03:47:26:283PM | Plasma | Ok | |
| 21 | 04:06:17:993PM | Plasma | Ok | |
| 22 | 04:19:37:547PM | Plasma | Ok | |
| 23 | 04:38:25:427PM | Plasma | Ok | |
| 24 | 04:58:14:700PM | Plasma | Ok | |
| System Availability | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Apr 26 2010 08:46:43:870PM | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Re-fit runs 1100316~26
IDL> restore,'abs_100323.dat' IDL> restore,'wp100423.dat' IDL> mdsopen,'electrons',1100322001 % Compiled module: MDSOPEN. % Compiled module: MDSVALUE. % Compiled module: MDSCHECKARG. % Compiled module: MDSISCLIENT. % Compiled module: MDSIDLIMAGE. IDL> mdsput,'calib:abs_calib','$',ab % Compiled module: MDSPUT. IDL> mdsput,'calib:calib_coef','$',gn_rt IDL> mdsclose % Compiled module: MDSCLOSE. IDL>put_wp, 1100322001, 1100316001, 1100326040 IDL> put_abs_calib, 1100322001, 1100316001, 1100326040 % Compiled module: PUT_ABS_CALIB. IDL> put_errors, 1100316001, 1100326040 % Compiled module: PUT_ERRORS. IDL> re_fit_tab, 1100316001, 1100326040 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||