| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | Matt Reinke,John Walk |
| Physics operator(s): | Jim Irby,Earl Marmar,Jim Irby |
| Engineering operator(s): | Bill Cochran,Andy Pfeiffer,Ed Fitzgerald,Thomas Toland |
| Engineering Operator Run Comment |
| MP 662 - HIREXSR Calibration |
| Session Leader Plans |
| Entered: Aug 27 2012 01:12:56:370PM |
| Author: Matt Reinke |
| MP 662 - HIREXSR Calibration
SL : M.L. Reinke PO : E. Marmar 8:00 - 9:00 am **EARLY START** We'll use hour to complete a masking test (3 shots) and run the locked mode. Assume the gas-setup is the same as 1120824 with Ar in H-BOT A) MASKING TEST FOR VIGNETTING Load 1120824014 (1.0 MA, nl04 ~ 0.6, LSN). Turn off ICRF and Ne puff (B-side lower), make sure H-BOT is enabled for shot 001. If ICRF is available and wants to use part of the flattop for conditioning thats fine, but keep to t > 1.2 seconds. 1) no mask 2) mask A-side 3) mask C-side B) LOCKED MODE CALIBRATION Remove mask, insert medium mask for run if desired. Load 1120824018 (0.8 MA locked mode) and adjust nl04 programming to prevent drop into slide-away regime. Modify H-BOT puffing based on "yield" from previous shots. |
| Entered: Aug 27 2012 03:41:03:837PM |
| Author: John Walk |
| MP707 - Pedestal and heat-flux width scaling studies in I-mode plasmas
Today's run will continue from last friday (1120824), examining the scaling of the pedestal and scrape-off layer heat flux with density, plasma current, and ICRF heating power. We will operate in lower single null with reversed field and current (thus with unfavorable ion grad-B drift) - this will allow steady I-mode access using the lower divertor, with shaping optimized for pedestal diagnostic coverage. This experiment will have two goals: (a) pedestal structure and scaling across a broad range in plasma current (700-1300kA) and RF power (3-5MW) at several density values, leading to empirical scaling relations and ultimately turbulence and stability analyses of the I-mode pedestal (b) scaling of SOL heat flux width at the lower divertor with plasma current and heating power (J. Terry) We will be holding the shaping as consistent as possible across the run day to isolate pedestal dependences on the three parameters of interest, with some field variation ~0.1T to shift ECE channel positions. General Parameters: toroidal field: 5.5T (may raise to 5.8T for high-current shots to reduce sawtooth heat pulses) plasma current: 700-1300kA (steady in individual shots) working gas: D2 ICRF: 3-5MW initially (may increase to 6MW in high-current shots) LBO: injecting Ca Gas puffing: D2 through NINJA for CXRS Ar puff for HiReX He for GPI on request Ne seeding Diagnostics: core and edge Thomson Scattering CXRS with D2 puffing LBO with Calcium IR thermography inner and outer thermocouples HiReX SR in, high-Te configuration (M.L. Reinke) ECE (GPC, GPC2, FRC) CECE O-mode reflectometer on fast digitization previous results: This experiment's plan calls for three blocks at fixed Greenwald fraction of 0.2, 0.3, 0.4, with each block containing a current scan from 700-1300kA and an RF power scan from 3-5MW. Although friday's run was abbreviated due to LN2 and power supply problems, we still attained good data at 1000 and 1300kA in the low-density block. Attempts at 700kA at low density did not access I-mode (this was not unexpected) and caused some serious heat loading on the limiter - we will hold off on these. At the end of friday, a plasma was attained at 850kA on the mid-density pass, but seemed to remain in L-mode. This is a good place to start for the 1120828 run, going into the mid-density block. Modifications from friday's run: (a) the original run plan called for two shots at each density/current stage, one with RF starting at 4MW and stepping down to 3MW, and the other with RF stepping from 4-5MW. This was intended to immediately kick the plasma into a hot I-mode; however, we found that the high initial power input led to serious injection problems in the earlier phases of the RF steps. This was corrected by going to a single 3-5MW RF step (in 500kW intervals, rather than 250kW) at each current/density. We will continue with this RF plan for 1120828. Additionally, at the ICRF operator's discretion we may increase the maximum power to 6MW on high-current shots, attempting to trigger any instabilities at the high-pressure limit in the pedestal. (b) The high-current shots friday were found to have substantial sawtooth heat pulses altering the edge temperature. This could be suppressed somewhat by going to a slightly higher field (up to 5.8T). We recognize that this will affect ECE channel positioning. ECE operators should position based on 5.5T plasmas (i.e., same settings as friday). Shot Groups: Three blocks, f_Gr = 0.2, 0.3, 0.4. Each block contains shots at 700, 850, 1000, 1150, 1300kA. Each current/density point contains an RF stairstep from 3-5MW in 200ms intervals, step size of 500kW. Target nl04 for each current (low, mid, high): 700kA: 0.54, 0.81, 1.09 850kA: 0.66, 0.99, 1.32 1000kA: 0.77, 1.16, 1.55 1150kA: 0.89, 1.34, 1.79 1300kA: 1.01, 1.51, 2.02 We will also have repeat shots with flat-top RF power for J. Terry's piggyback experiment. We will swap out D2 puffing from NINJA in favor of He puffing for GPI. These flat-tops may optionally also include He puffing for CXRS and Ca injection from LBO. Shot Plan: This MP's run will begin at 9AM, following locked-mode calibration shots for HiReX (run by Matt Reinke). We will start by loading 1120824027, the last shot from friday (850kA, f_Gr = 0.3, nl04 = 0.93). We will begin the mid-density block (f_Gr = 0.3) with this shot, proceding through the current scan. To cover a broad range, we will hit only the 850kA, 1000kA and 1300kA targets in the mid-density block to start. Note that the 1300kA shot may include an altered field and increased max RF power (see above). After hitting these three target shots, we will take RF flat-top alternate shots for the SOL group. We will then proceed to the high-density pass, beginning with the 700, 1000, 1300kA cases. I anticipate difficulty in accessing I-mode at the high-current range (as this will be at a substantial density, nebar ~3e20). If necessary, we may take this shot at a lower target density. These shots will again be followed with RF flat-top alternate shots at current/density/RF points with successful I-modes. If all planned shots to this point are obtained, we will return to the low-density block and "fill in the gaps" at 850 and 1150kA, likewise the 700 and 1150kA and 850/1150kA shots at mid and high density targets. We may also repeat the 100kA shots at low density with the modified RF plan. |
| Entered: Aug 28 2012 09:38:38:347AM |
| Author: John Walk |
| attempt: 1MA, f_Gr = 0.3, nl04 = 1.16
Ran to rampdown, few RF trips on J antenna. No obvious I-modes. Density is a little high (1.3, targeting 1.16) with the RF, but decently flat throughout. Stored energy looks a little low, Wplasma ~ 100kJ. We can probably go to higher RF power for these shots. next: attempt 1.3MA, f_Gr = 0.3 |
| Entered: Aug 28 2012 09:52:58:543AM |
| Author: John Walk |
| attempt: 1.3MA, f_Gr = 0.3, nl04 = 1.5, 3-5MW ICRF.
result: ran to rampdown, no apparent I-modes. Still getting some density rise with RF trace. RF tripping at high power. next: repeat this current and target density (lower programmed density to allow for density rise with RF). Increase RF power - 750kW steps instead of 500kW, so steps go 3-6MW instead of 3-5MW. Hold last step of RF into rampdown (to 1.7sec) to try to hold off disruption. |
| Entered: Aug 28 2012 10:04:22:647AM |
| Author: John Walk |
| attempt: 1.3MA, nl04 = 1.5, 3-6MW ICRF
result: early disruption. next: repeat. |
| Entered: Aug 28 2012 10:35:07:680AM |
| Author: John Walk |
| attempt: repeat with 6MW max power
result: 4 small H-modes (maybe good for threshold studies?), RF power knocks out at higher powers. Still not seeing I-modes. next: repeat current and power demands at slightly lower density. Shoot for nl04 = 1.25 (program lower to account for gas from walls) down from 1.5. 1.3MA shots on 1120824 were at nl04 = 1.0. |
| Entered: Aug 28 2012 10:54:02:350AM |
| Author: John Walk |
| attempt: 1.3MA, nl04 = 1.25, 3-6MW ICRF.
result: H-modes at 1.15 and 1.3s, I mode from 1.0-1.15s in the 4.5-5MW steps. H-modes are still knocking out the RF at higher powers. next: try increasing the field to 5.8T, suppress the sawteeth a little - try to keep the heat pulses from kicking the plasma into H-mode |
| Physics Operators Plans |
| Entered: Aug 27 2012 03:01:54:950PM |
| Author: Earl Marmar |
| Engineering setup for Tuesday 2012/08/28
1st hour: MP662 - HIREX calibration then MP707 - Pedestal and heatflux-width scaling studies in I-mode plasmas Session leader: M. Reinke/J. Walk Physics operator: E. Marmar/J. Irby ECDC in Deuterium overnight Power systems as on: 1120824014 (rev B, 5.5 T, 1 MA, 7.5e19 m-2, LSN) A-coil configuration: -Dtop +Dbot +Jtop -Jbot; Hybrid enabled (reversed field configuration) Gas Setup: fill B-Top with 6 psi D2 Hybrid enabled (PG4) fill B-side lower with 2 psi Ne Hybrid DISABLED (PG1) leave B-side upper as is Hybrid DISABLED (PG2) fill B-main (C-side) with 40 psi D2 Hybrid enabled (PG3) fill H-bottom with 1 psi Ar Hybrid enabled(PG5) leave B-div as is Hybrid DISABLED (PG6) leave H-div as is Hybrid DISABLED (PG7) fill NINJA F-port with 10 psi D2 DISABLED fill NINJA C-port with 10 psi He DISABLED Enable the following gate valves and shutters, assuming no vacuum problems: ECE, VUV, Z-bolo, HIREX-Sr, Xeus, LoWEUS Torvac setup: keep gate valves open during pulse Required systems: ICRF (up to 5 MW) Required diagnostics: CXRS, GPI, LBO w/CaF2, IR thermography & TC's, HIREX-SR, TS, ECE, reflectometry Desired diagnostics: DNB, CECE, HIREX-JR ------------------------------------------------------------------------------ Boronization overnight: no ICRF: yes, up to 5 MW LH: no Impurity injector: yes, w/CaF2 DNB: desirable Cryopump: no ------------------------------------------------------------------------------ |
| Session Leader Summaries |
| Entered: Aug 28 2012 05:53:56:690PM |
| Author: John Walk |
| MP707 - pedestal and heat-flux width scaling studies in I-mode plasmas
28 shots: 2 locked-mode attempts 6 early disruptions 2 disruptions in RF phase 18 plasmas into rampdown of the 2 disruptions in RF phase: neither attained I-mode. This run day picked up with shot 008 following HiReX calibration shots by M. Reinke in the early start to the run, with my shots starting at around 9:40. The goal was to cover higher densities and a broader current range than was attained in the first run day of this MP (1120824). These shots were originally intended for a fixed Greenwald fraction of 0.3 (the middle pass in the planned density scan) but these shots were generally found to be at too high a density for ready I-mode access. Target densities were generally lowered (still above those used on 1120824) with greater success. This, however, means that the proposed f_Gr = 0.4 sweep is moot (which allows us more time to focus on the lower densities in any case). Density control was initially somewhat difficult due to wall outgassing; this, combined with the high Ne seeding used friday, led to some problems keeping P/ne low enough for I-mode access in higher current/density shots. It wasn't until shot 021/022 (which were attempted without seeding) and after (with reduced seeding) that we were really dialed in. Run quality was also substantially improved by upping the field to 5.7T (suppressing the sawteeth somewhat) and lowering the maximum RF power to 4-4.5MW. Earlier shots in the day (with higher power/Ne seeding) were typically mixed I- and H-modes, with good results at 1000 and 1300kA. After altering Ne seeding, good I-mode data at 1000kA was obtained with RF power stairsteps, and at 1150 and 1300kA with RF flat-tops. The 1000kA shots also included a good set of CXRS data with D2 and He puffing and an L-gap scan, while the RF flat-top included multiple Ca injections from LBO measured by HiReX for impurity transport data. Overall, we now have good data sets at from 1000-1300kA at multiple density and RF points. Two shots today (031 and 032) were attempted at altered shaping (higher lower triangularity) at high current and low density, seeking to mirror as closely as possible shots from 1100204, which attained ELMs on forward-field USN I-modes. However, it was not possible to mirror the shaping due to lower divertor geometry, nor could we get the density low enough (the second attempt led to a disruption, with no I-mode access for either). A more careful approach is necessary to try to replicate these results in LSN I-modes. |
| Physics Operator Summaries |
| Entered: Aug 28 2012 05:53:15:320PM |
| Author: Earl Marmar |
| The machine ran reasonably well today. There was one no-gas dud (shot 5, unexplained). The first part of the run was largely successful, but the programmed locked mode shot did not appear to lock. Later attempts were better but not great, and the final locked mode attempt (shot 35) locked and disrupted early, before useful hirex data could be acquired.
Several shots ended in early disruptions. I-modes were somewhat elusive early on, and then settled in to get decent performance. Finding a happy medium for the neon injection was important: too much, and the confinement was poor (e.g.shot 17, 19), too little and there were injections (e.g. 22). Shot 23 had a better amount, and we left it there for the rest of the day (except for locked mode attempts, where neon was disabled). LLNL1 camera shows G-H limiter and shoelace antenna getting hot on lowish current shots with RF (e.g. shot 33, where the disruption may be due to an injection from the G-H limiter). The disruption on 34 appears to be due to a major injection from the shoelace antenna. After the run, it was reported that the shoelace antenna is now broken (resistance 10k-ohm). The run ended about 15 minutes early when the EF1U nitrogen valve became stuck; symptoms are ice build-up from an LN2 leak. Scorecard: 33 plasmas, 0 fizzles, 1 dud, 1 test 35 data cycles |
| Entered: Aug 29 2012 10:45:37:340AM |
| Author: Jim Irby |
| I stood in for Earl for shots 33 and 35:
Following a 1.3 MA disruption on shot 32, Earl dropped the plasma current to 850 kA for shot 33. This shot disrupted at 0.71 s. We tried to repeat it for shot 34, which ran for about 1.35 s. However, this discharge resulted in overheating of the GH limiter and a fault in the shoelace antenna. The shoelace indicated > 10 kOhm DC resistance (instead of a short) following the run. Both the limiter and the antenna continued to glow for many LLNL camera frames following the shot. On shot 35 we tried one more time for a locked mode, but the plasma disrupted in less than 0.4 s. We attempted to reduce the density and increase the plasma current; possibly overdoing what was needed to get the mode to lock. |
| Session Leader Comments | |||
| Aug 28 2012 08:08:55:740AM | 1120828002 | Matt Reinke | ohmic target shot - repeat of 1120824014 w/o Ne and ICRF
RESULT: early disruption, not hot enough to get any signal on HIREXSR NEXT: repeat |
| Aug 28 2012 08:27:25:197AM | 1120828003 | Matt Reinke | attempt at (unmaksed) Ohmic target
RESULT: great shot! NEXT: repeat with C-SIDE masked |
| Aug 28 2012 08:39:19:213AM | 1120828004 | Matt Reinke | repeat 003 Ohmic shot with C-SIDE of crystal masked
RESULT: an excellent repeated shot, got a little RF too NEXT: repeat with A-SIDE covered |
| Aug 28 2012 08:54:38:547AM | 1120828005 | Matt Reinke | repeat 003 Ohmic with A-SIDE of crystal covered
RESULT: dud NEXT: repeat to get A-SIDE coveraged shot |
| Aug 28 2012 09:11:22:010AM | 1120828006 | Matt Reinke | repeated 003 Ohmic target with A-SIDE of crystal masked
RESULT: excellent shot NEXT: remove masks and run locked mode |
| Aug 28 2012 09:22:21:920AM | 1120828007 | Matt Reinke | locked mode plasma for HIREXSR calibration. Loading 1120824018, added a non-negative density demand and increasing the H-BOT ar puff
RESULT: got an ohmic target but failed to lock - MHD shows a 5-6 kHz oscillation (rotation?) Probably will want another attempt later in the day... NEXT: end of MP 662 - turn over to J. Walk for MP 707 |
| Aug 28 2012 11:12:00:550AM | 1120828013 | John Walk | attempt: hold current and density, increase field to suppress sawteeth
result: lose D-ant at 1.3, H-mode at 1.1 knocks out RF. Looks to be getting into I-mode before that. Seems reducing the sawteeth is delaying H-mode, but delays the I-mode transition as well. next: we seem to be having the best luck in the 4-4.5MW range, so we'll stick with that. Hold this current and density, and go to 4MW ICRF from 0.5-1.0s, and 4.5MW from 1.0-1.5s. The next shot will also include a gap scan for CXRS. |
| Aug 28 2012 11:21:35:803AM | 1120828014 | John Walk | attempt: modify RF programming, hold density and current.
result: another early disruption. next: repeat |
| Aug 28 2012 12:06:19:293PM | 1120828015 | John Walk | attempt: repeat density and current, drop initial RF stage down to 3MW to try to prevent early injections
result: another early disruption. |
| Aug 28 2012 12:09:17:927PM | 1120828016 | John Walk | attempt: delay RF start to 0.6s to try to avoid these early injections, same current and density.
result: plasma runs, D-ant faults at 1.25s. Wimpy I-modes at 1.1-1.25s, still some non-fatal injections. next: increase Ne seeding, decrease Ar puff. |
| Aug 28 2012 12:22:25:357PM | 1120828017 | John Walk | attempt: decrease Ar, increase Ne seeding
result: runs to rampdown, no major RF losses. Looks like a lower-confinement I-mode before 1.3s RF trip. next: we've been hammering 1.3MA for a while now. Let's go back down to the 1MA case and try to get some I-modes there. Try for nl04 = 1.0 |
| Aug 28 2012 12:39:48:620PM | 1120828018 | John Walk | attempt: 1MA, nl04 = 1.0, same RF programming.
result: J-ant trips several times at 4.5MW, looks like it stays in L-mode |
| Aug 28 2012 12:53:13:013PM | 1120828019 | John Walk | attempt: repeat
result: still looks like L-mode like in 018, lots of outgassing from walls. J-ant still faulting at high power. next: try to get gas down; RF seems to like the Ne and we want to avoid Mo injection, so let's lower target nl04 to 0.9 from 1.0 |
| Aug 28 2012 01:05:16:810PM | 1120828020 | John Walk | attempt: 1MA, nl04 = 0.9, 3-4.5MW
result: lowering target nl04 didn't seem to affect density too much, still lots of outgassing. J-ant is still uncooperative. next: still need to get the gas down to boost P/ne. See if we can run without Ne seeding without too many injections. |
| Aug 28 2012 01:16:47:670PM | 1120828021 | John Walk | attempt: repeat without Ne seeding
result: large Mo injection kills plasma before RF next: try again |
| Aug 28 2012 01:34:28:223PM | 1120828022 | John Walk | attempt: retry 1MA, nl04 = 0.9 without Ne seeding to reduce Prad.
result: pretty good! two H-modes after 1.25s, E-ant dies at 1.35, but steady 4.5MW before then. Lots of Mo injections, but good-looking I-mode in between (1.15-1.25s especially). next: removing Ne did reduce Prad, but we're getting injections instead. Let's turn the Ne back on, but not as high as before - 60V for 250ms. |
| Aug 28 2012 01:50:12:603PM | 1120828023 | John Walk | attempt: repeat with some Ne seeding
result: H-mode at 1.3s, I-mode before then - best phase after 1.1s up until RF trips. next: Ne seeding levels look good, let's lower target density a little more to 0.8 (strong I-mode transition comes after a density drop). Lower plenum pressure for NINJA too to try to avoid the H-mode at the end. |
| Aug 28 2012 02:05:39:897PM | 1120828024 | John Walk | attempt: repeat with lowered target density (nl04 = 0.8)
result: more good I-modes after 1.0s or so until H-mode at 1.35s. Density crawls up before the H-mode starting at 1.2s, Te drops accordingly. next: repeat without gap scan, NINJA D2 with early puff (will puff He for next shot) |
| Aug 28 2012 02:18:28:880PM | 1120828025 | John Walk | attempt: repeat with D2 puffing without gap scan
result: H-mode at 1.25s, RF generally behaves. Goes into I-mode before step up to 4.5MW (0.8s or so). next: repeat with He puffing instead of D2 for CXRS - first puff only, try to avoid H-mode |
| Aug 28 2012 02:36:45:520PM | 1120828026 | John Walk | attempt: repeat with He puff for CXRS comparison
result: no H-mode, Te droops after 1.1s, I mode at 1.0s next: no NINJA, flat-top RF at 4MW for LBO+HiReX |
| Aug 28 2012 02:52:01:467PM | 1120828027 | John Walk | attempt: 1MA, nl04 = 0.8, flat-top RF at 4MW; no NINJA, fire LBO for HiReX
result: steady I-mode after 1.0s, edge Te, Wplasm droops a little after 1.1s |
| Aug 28 2012 03:01:07:660PM | 1120828028 | John Walk | attempt: up to 1150kA, nl04 = 1.0, disable NINJA; fire LBO w/ Ca for HiReX
result: early disruption next: repeat |
| Aug 28 2012 03:18:49:380PM | 1120828029 | John Walk | attempt: repeat 4MW, 1150kA, nl04 = 1.0 with LBO+HiReX
result: two distinct I-mode phases at 1.0 and 1.2s, RF fault in between, edge grad-Te distinctly higher in second phase. Good LBO data. next: locked mode for Matt |
| Aug 28 2012 03:32:07:853PM | 1120828030 | John Walk | attempt: locked mode for Matt
result: doesn't lock, but less rotation than this morning next: try to mirror as closely as possible I. Cziegler's shots from 1100204, which got ELMs in I-modes. These were at 1.3MA, nl04 = 0.9 (somewhat lower than we had tried on friday), in forward-field upper-null plasmas. We can match the triangularity away from the active X-point, but will be somewhat lower triangularity towards the active X-point (the upper-null shots were at delta_u of 0.7, which we can't match in the lower divertor). Decrease RXL to try to stretch the lower plasma out, while avoiding putting the strike point down in the slot. |
| Aug 28 2012 03:41:59:947PM | 1120828031 | John Walk | attempt: alter shaping to increase delta_l, 1.3MA, nl04 = 0.9. go for ELMs.
result: runs to rampdown, large injection at 0.75s. No I-mode. Density is well above target. |
| Aug 28 2012 04:01:35:777PM | 1120828032 | John Walk | attempt: repeat
result: disrupts at 1.0s, no I-mode. Strike point is getting dangerously close to the floor, don't think we can match triangularity closely enough to replicate Isztvan's shots. next: return to planned shaping, lower current to 850kA, nl04 = 0.75. Return to 4-4.5MW RF stepping. |
| Aug 28 2012 04:09:14:323PM | 1120828033 | John Walk | attempt: 850kA, 4-4.5MW ICRF, nl04 = 0.75
result: disrupts at 0.7s next: repeat |
| Aug 28 2012 04:36:56:180PM | 1120828034 | John Walk | attempt: repeat 033
result: disrupts at 1.35s, possible injection off of QCM antenna (cell access to check). Injections seem to be hitting edge Te hard. Edge grad Te does pick up with RF, but not obvious I-mode. next: take another locked-mode attempt for Matt, still haven't gotten one today. Could use a shot with no RF to let things cool as well. |
| Aug 28 2012 04:59:31:560PM | 1120828035 | John Walk | attempt: another locked mode try for Matt
result: disrupts at 0.38s next: try for one last locked mode unless LN2 problems stop us, to put a bow on the HiReX data for high-current shots today |
| Aug 28 2012 05:08:48:487PM | 1120828035 | John Walk | EF1U nitrogen line is borked, so we'll go ahead and call the run. |
| Physics Operator Comments | |||
| Aug 28 2012 08:00:03:420AM | 1120828001 | Jim Irby | Loaded from 1120824014
verified that H-Bottom was enabled with 1 psi Argon, 300 to 400 ms verified that B-Side Lower was disabled Open tree done prepuff 22 ms |
| Aug 28 2012 08:17:50:320AM | 1120828002 | Earl Marmar | plasma, very early disrupt
relatively fast early density rise, marfe Matt reports "iron" appears to be a small nitrogen leak (mass 28 = 5e-8) |
| Aug 28 2012 08:25:38:793AM | 1120828003 | Earl Marmar | reduce segment 1 PG3 puff after 30 ms
plasma, full length |
| Aug 28 2012 08:37:56:393AM | 1120828004 | Earl Marmar | no dpcs changes
plasma, full length 2 MW ICRF causes density rise |
| Aug 28 2012 08:53:34:383AM | 1120828005 | Earl Marmar | no dpcs changes
dud, no gas |
| Aug 28 2012 09:14:04:917AM | 1120828006 | Earl Marmar | TF start to -1.1 s (from -1.0)
plasma, full length 1 MW RF causes density rise (but smaller than on shot 4) |
| Aug 28 2012 09:27:26:183AM | 1120828007 | Earl Marmar | locked mode shot
import segment 4 from 1120824018 into segment 4 turn off segment 2, turn on segment 4 program nl_04 target to 3e19 (instead of negative) from 1.0 to 1.5 seconds increase PG5 puff (argon) to 125 ms (from 100 ms), still starting at 0.3 s no RF plasma, disrupt in rampdown (0.43 MA) does not appear to have locked (keeps sawtoothing) A-coil programming looks ok |
| Aug 28 2012 09:41:04:987AM | 1120828008 | Earl Marmar | switch to MP 707
turn off segment 4, turn on segment 2 nl_04 target to 1.16e20 enable neon (B-side lower), PG1 puff 250 ms starting at 0.35 s plasma, disrupt in rampdown (0.73 MA) L-mode |
| Aug 28 2012 09:51:50:827AM | 1120828009 | Earl Marmar | load from 1120824016 (1.3 MA)
nl_04 target to 1.5e20 import segment 1 from model into segment 1 plasma, disrupt in rampdown (0.86 MA) bouncy startup, no hards L-mode |
| Aug 28 2012 10:10:06:693AM | 1120828010 | Earl Marmar | nl_04 target to 1.3e20
plasma, early disruption (brick?) |
| Aug 28 2012 10:31:14:333AM | 1120828011 | Earl Marmar | no dpcs changes
plasma, disrupt in rampdown 4 short ELM-free H-modes, no I-mode |
| Aug 28 2012 10:55:57:373AM | 1120828012 | Earl Marmar | nl_04 target to 1.05e20
plasma, disrupt in rampdown some H-modes, maybe a short I-mode |
| Aug 28 2012 11:08:01:770AM | 1120828013 | Earl Marmar | TF to 5.8 T (159.2 kA)
plasma, disrupt in rampdown I-mode, then H-modes |
| Aug 28 2012 11:27:56:667AM | 1120828014 | Earl Marmar | increase argon (PG5) to 125 ms (from 100 ms), still starting at 0.3s
triangular left gap scan (decrease 4 mm, then back to 0), between 0.75s and 0.9s plasma, early disruption (shortly after RF turn-on) bouncy startup hesitation in Ip rise just after segment switch some hards |
| Aug 28 2012 11:45:08:427AM | 1120828015 | Earl Marmar | move left gap scan to start at 1.25 s, finish at 1.4s, still 4mm amplitude
plasma, disrupt early in flattop (0.62 s) Prad looks like something is melting better startup |
| Aug 28 2012 12:03:40:923PM | 1120828016 | Earl Marmar | no dpcs changes
plasma, nearly full length looks like I-mode between 1.15 and 1.3 s no H-mode |
| Aug 28 2012 12:20:53:623PM | 1120828017 | Earl Marmar | neon to 100 V (from 90), same timing
argon to 200 ms (from 225) plasma, disrupt in rampdown I-mode in the middle of the shot |
| Aug 28 2012 12:34:50:790PM | 1120828018 | Earl Marmar | 1.0 MA, nl_04 target to 1.0e20
plasma, disrupt in rampdown J faulting after 1 second |
| Aug 28 2012 12:52:00:160PM | 1120828019 | Earl Marmar | no dpcs changes
plasma looks a lot like 18 |
| Aug 28 2012 12:52:22:127PM | 1120828020 | Earl Marmar | nl_04 target to 0.9e20 |
| Aug 28 2012 01:18:12:663PM | 1120828021 | Earl Marmar | disable neon
increase magnitude of left-gap sweep (now targeting 0 to -8mm to 0) plasma, early disruption (pre-RF) bouncy startup, a few early hards |
| Aug 28 2012 01:38:01:530PM | 1120828022 | Earl Marmar | no dpcs changes
plasma, full length I-mode, a couple of H-modes, some injections |
| Aug 28 2012 02:02:07:490PM | 1120828023 | Earl Marmar | neon back on, 60 V, 250 ms
plasma, disrupt in rampdown I-mode, H-mode fewer/no injections during RF |
| Aug 28 2012 02:02:19:187PM | 1120828024 | Earl Marmar | nl_04 target to 0.8e20
plasma, disrupt in rampdown (400 kA) I-mode, H-mode startup ok |
| Aug 28 2012 02:40:55:597PM | 1120828025 | Earl Marmar | no dpcs changes
plasma, disrupt in rampdown (400 kA) steady I-mode, then H-mode |
| Aug 28 2012 02:27:07:680PM | 1120828026 | Earl Marmar | no dpcs changes
plasma, disrupt in rampdown (400 kA) I-mode, no H-mode |
| Aug 28 2012 02:51:39:820PM | 1120828027 | Earl Marmar | lose the gap scan
no NINJA LBO injections plasma, disrupt late in rampdown (300 kA) steady I-mode, no H-mode bouncy startup, some early hards |
| Aug 28 2012 03:02:31:480PM | 1120828028 | Earl Marmar | 1.15 MA, nl_04 target to 1.0e20
argon (PG5) puff to 120 ms (from 100) plasma, early disrupt (pre-RF) bouncy startup, some early hards |
| Aug 28 2012 05:25:18:933PM | 1120828029 | Earl Marmar | no dpcs changes
plasma, full length decent I-mode(s) |
| Aug 28 2012 03:29:59:087PM | 1120828030 | Earl Marmar | locked mode
turn off segment 2, turn on segment 4 tweak Nl_04 prop gain increase argon (125 ms from 50) plasma, disrupt in rampdown no locked mode |
| Aug 28 2012 04:00:33:893PM | 1120828031 | Earl Marmar | 1.3 MA
decrease RXL (1 cm), trying for increased delta_lower nl_04 target to 0.9e20 plasma, disrupt in rampdown L-mode all the way |
| Aug 28 2012 04:00:08:557PM | 1120828032 | Earl Marmar | nl_04 target to 0.8e20
plasma, disrupt at 1.0 s |
| Aug 28 2012 04:11:16:173PM | 1120828033 | Jim Irby | changes --------------------------------
Earl lowered the plasma current and changed the target density results -------------------------------- plasma for 0.71 s |
| Aug 28 2012 05:16:20:827PM | 1120828033 | Earl Marmar | Ip to 850 kA
nl_04 target to 7.5e19 plasma, disrupt in flat-top, 0.72 s |
| Aug 28 2012 04:27:38:203PM | 1120828034 | Jim Irby | changes --------------------------------
try again for 850 kA discharge prepuff from 22 to 20 ms Otd results -------------------------------- plasma into for 1.35 s |
| Aug 29 2012 07:53:50:103AM | 1120828035 | Jim Irby | changes --------------------------------
Going to locked mode shot again seg 2 off seg 4 off neon off rf off nl04 prop gain from 8 to 3 derivative gain to 5 Otd results -------------------------------- plasma for 0.387 s --- end-of-run problems with ln2 cooling --- leak |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 06:06:17:493AM | Test | Ok | |
| 2 | 08:02:10:180AM | Plasma | Ok | |
| 3 | 08:17:35:650AM | Plasma | Ok | |
| 4 | 08:30:58:090AM | Plasma | Ok | |
| 5 | 08:46:51:250AM | Plasma | Ok | |
| 6 | 09:00:12:623AM | Plasma | Ok | |
| 7 | 09:14:32:157AM | Plasma | Ok | |
| 8 | 09:27:13:230AM | Plasma | Ok | |
| 9 | 09:41:52:693AM | Plasma | Ok | |
| 10 | 10:01:50:833AM | Plasma | Bad | OH1 Type 1 Flt |
| 11 | 10:20:15:177AM | Plasma | Ok | |
| 12 | 10:37:50:600AM | Plasma | Ok | |
| 13 | 10:53:03:593AM | Plasma | Ok | |
| 14 | 11:16:33:583AM | Plasma | Ok | |
| 15 | 11:36:46:840AM | Plasma | Ok | |
| 16 | 11:52:30:643AM | Plasma | Ok | |
| 17 | 12:09:37:633PM | Plasma | Ok | |
| 18 | 12:24:49:320PM | Plasma | Ok | |
| 19 | 12:39:13:793PM | Plasma | Ok | |
| 20 | 12:53:34:670PM | Plasma | Ok | |
| 21 | 01:08:13:667PM | Plasma | Ok | |
| 22 | 01:20:46:560PM | Plasma | Ok | |
| 23 | 01:35:24:173PM | Plasma | Ok | |
| 24 | 01:49:47:960PM | Plasma | Ok | |
| 25 | 02:05:51:963PM | Plasma | Ok | |
| 26 | 02:21:07:967PM | Plasma | Ok | |
| 27 | 02:36:25:367PM | Plasma | Ok | |
| 28 | 02:52:27:050PM | Plasma | Bad | OH2L Comm failure |
| 29 | 03:06:15:827PM | Plasma | Ok | |
| 30 | 03:21:15:833PM | Plasma | Ok | |
| 31 | 03:35:30:290PM | Plasma | Ok | |
| 32 | 03:50:11:507PM | Plasma | Ok | |
| 33 | 04:05:16:873PM | Plasma | Ok | |
| 34 | 04:18:50:670PM | Plasma | Ok | |
| 35 | 04:43:05:727PM | Plasma | Ok | |
| System Availability | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Aug 28 2012 06:05:57:997AM | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Aug 28 2012 06:03:28:853PM | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| REPEAT: Additional transmission measurements of attenuator fibers
SETUP Fstop: 1.8/1.8 Controller Gain: 2/2 ADC Offset: 225/200 photonSetup.pro Number of Frames: 20 Length of Frames: 60 msec Time to Start: 0.00 sec data aquired on Ph1, C5 Use bare fiber #58, 0.4mm, 6.5 m long Calibrated Labsphere 701: Background 702: 09-91248 (temporarily called "alpha"); voltage=0.2246e-6 703: bare; voltage=0.2245e-6 704: 09-91248 (temporarily called "alpha"); voltage=0.2245e-6 705: bare; voltage=0.2245e-6 706: 09-91248 (temporarily called "alpha"); voltage=0.2245e-6 707: bare; voltage=0.2245e-6 708: 09-91248 (temporarily called "alpha"); voltage=0.2246e-6 709: bare; voltage=0.2245e-6 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||