| Miniproposals | ||||||||||
|
| Operators | |
| Session leader(s): | Brian Labombard |
| Physics operator(s): | Ron Parker |
| Engineering operator(s): | Sam Pierson,Ed Fitzgerald |
| Engineering Operator Run Comment |
| automatically entered by signon - please replace with real comment |
| Session Leader Plans |
| Entered: Nov 22 2005 10:14:33:157PM |
| Author: Brian Labombard |
Session Leader Run Plan for 1051123
MP#409 "SOL Phase space studies"
Goals
Make progress towards completing MP#409 "SOL Phase space studies". The last time we
attempted to work on this MP (1051110), we were also testing a new A-port scanning probe
(carbon head), which did not yield any useful data. This time we will use a standard
molybdenum head. We also hope to dial-up some ohmic H-modes today to look for a change in
SOL flow response at the L-H transition
Shot Sequence Outline
A. First we will dial-up some standard 0.8 MA lower single null and upper single
null discharges. This will allow us to cross-check profile and flow measurements made
on previous runs.
B. Then we will attempt to run some 0.8 MA ohmic H-modes using the usual ramp-down
and ramp-up of the toroidal field (EDA is desired but not expected at the present
boronization level). Of particular interest is the SOL flow behavior just before
and just after the L-H transistion. In order to track this bevavior, we may need to
run many discharges with the probes poking at different times. For reference, we
will also run some upper-null discharges with the same current and field programming
to see where they lie in the edge plasma 'phase-space' plot.
C. Next, we will hold the field fixed at 4 tesla, and map-out that portion of machine
parameter spaced called for in MP#409, performing a density scan there in LSN and USN
discharges.
Run Preparation Tasks (for probe diagnostics)
- Reconfigure A14 and A12 digitizer connections to outer divertor probe
array according to file: "put_new_fast_refs_2005_mar01.tcl"
- Execute TCL>@put_new_fast_refs_2005_mar01.tcl
- Configure ASP bias supplies: PA93 amplifiers ("DC supply") in standard sweep mode,
"Sweep A" and "Sweep B" set to -200 volts
- Use IDL code to switch ASP probe triggering and ASP/FMP power supply biases
between one of two modes:
"Scan" mode - ASP: N,S,E,W electrodes in current mode, "DC supply"
Probe scanning three times during shot, 256k samples/channel
FMP: OSD**.p0 probes in current mode, "Sweep B" supply
OSD**.p1 probes in current mode, "DC -" supply
OSD**.p2 probes in floating mode, "DC +" supply
"Dwell" mode - ASP: W & S electrodes in current mode, "Sweep A" & "Sweep B"
N & E electrodes in floating mode
Probe in dwell mode, with 512k samples/channel
FMP: OSD**.p0 probes in current mode, "DC -" supply
OSD**.p1 probes in current mode, "DC -" supply
OSD**.p2 probes in floating mode, "DC +" supply
IDL code: mp409_scan.pro
undwell_scan_asp.pro
set_asp_pa93_sweep.pro
set_fmp_sweep.pro
mp409_dwell.pro
dwell_scan_asp.pro
set_asp_fluctuation_mp409.pro
set_fmp_fluctuation_mp409.pro
Run Preparation Tasks (for optical diagnostics)
- Set integration time on Xybion to 1 ms
- Connect the following fiber views for the fast diodes
Outer SOL views 1-3,5,7,9-14,31-40 (total of 21)
Innerwall SOL views B and C
- Connect the following fiber views for the CHROMEX
Outer SOL views 18-22,24-29 (total of 11)
Innerwall SOL views A,D,E,F - otherwise known as 1,4-6
- Set timing on fastdiode digitizers to 0.1 s after the A-B limiter NINJA puff timing
_______________
Plan A - Standard shots
Reload from shot#1051110009. This shot ran on segment#2. It was a LSN discharge
with Ip=0.8 MA, Bt= 5.4 tesla, NL04 = 0.6e20. Note: segment#3 has
a USN program that we will use (Segment#4 is double-null? will not be used today.)
ASP, FSP, ISP programmed to scan at 0.65, 0.85, 1.05 seconds
NINJA gas puff for GPI and boron V spectroscopy entering plasma at 1.1s
Set NINJA for D2 puff at A-B limiter and B16-001. Plenum pressure of 10 PSI.
Shots
1-3 LSN, NL04 = 0.6, Scan mode, optimize probe insertion
NINJA puff at 1.1 s, fast camera at 1.25 s
4-6 USN (segment #3), NL04 = 0.6, Scan mode, optimize probe insertion
NINJA puff at 1.1 s, fast camera at 1.25 s
________________
Plan B - Ohmic H-modes
Reload from shot#1051110017. This was an 0.8 MA discharge with Bt rampdown to 2.9 tesla.
Set target density to NL04 = 0.60
Ohmic H-modes started around 1s.
NOTE: reprogram ZXL to ramp down relative to present programming by 2 cm,
starting at 0.7 and ending at 1.4s. This is required to flatten the FSP target location.
Set probes to scan at 0.55, 0.8 1.05s.
Shots
7-17 Optimize probe insertions and depths to catch L and H phases
Optional: Run different target densities: NL04 = 0.7, 0.8
Change to USN (segment#3) and program identical Ip, Bt, NL04 waveforms.
ZXL programming may need to change on this shot as well.
18-? Optimize probe insertions and depths to collect data at similar Ip, Bt values as
ohmic H-mode
________________
If time remains:
Plan C - Begin 4 tesla, 0.8 MA density scan
Reload from shot#3 above. Program Bt to 4 tesla and NL04 = 0.6
ASP, FSP, ISP programmed to scan at 0.65, 0.85, 1.05 seconds
NINJA gas puff for GPI and boron V spectroscopy entering plasma at 1.1s
Set NINJA for D2 puff at A-B limiter and B16-001. Plenum pressure of 10 PSI.
Shots
LSN, NL04 = 0.6, Scan mode, optimize probe insertion
NINJA puff at 1.1 s, fast camera at 1.25 s
Set NINJA for D2 puff at A-B limiter and B16-001. Plenum pressure of 10 PSI.
Shots
LSN, NL04 = 0.6, Scan mode, optimize probe insertion
NINJA puff at 1.1 s, fast camera at 1.25 s
USN, NL04 = 0.6, Scan mode, optimize probe insertion
NINJA puff at 1.1 s, fast camera at 1.25 s
USN, NL04 = 0.4, Scan mode
NINJA puff at 1.1 s, fast camera at 1.25 s
LSN, NL04 = 0.4, Scan mode
NINJA puff at 1.1 s, fast camera at 1.25 s
LSN, NL04 = 0.8, Scan mode
NINJA puff at 1.1 s, fast camera at 1.25 s
USN, NL04 = 0.8, Scan mode
NINJA puff at 1.1 s, fast camera at 1.25 s
USN, NL04 = 1.0, Scan mode
NINJA puff at 1.1 s, fast camera at 1.25 s
LSN, NL04 = 1.0, Scan mode
NINJA puff at 1.1 s, fast camera at 1.25 s
|
| Physics Operators Plans |
| Entered: Nov 22 2005 03:00:08:697PM |
| Author: Ron Parker |
| Engineering setup for Wednesday 23-Nov-2005
MP 409 SOL Phase Space Session leader: Labombard Physics operator: Parker Overnight ECDC in D2, and bake at 60 C. Run begins at 09:00 and ends at 17:00 Power systems as on 1051110009 (0.8 MA, 5.4 T, lower single null) A-coil configuration: normal [+Dtop -Dbot -Jtop +Jbot] and enabled. Gas Setup: fill B-Top with 6 psi D2 Hybrid enabled (PG4) fill B-side lower with 1 psi Ar + 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 NINJA with 10 psi D2, Hybrid disabled Prepare for between shot boronization, but leave diborane bottle closed to begin. Enable the following gate valves and shutters assuming no vacuum problems: ECE, VUV, Z-bolo shutters Torvac setup: Gate valves open Important Diagnostics: ASP, FSP, ISP, Xybion camera, fast H-alpha diode array, Chromex, Edge TS No RF for this run The purpose of the run will be to expand the collection of SOL Phase Space data. See details under SL Plan |
| Session Leader Summaries |
| Entered: Nov 25 2005 09:53:06:523PM |
| Author: Brian Labombard |
| Run Summary for 1051123
MP#409 "SOL Phase space studies" ___________________________________________________________________________________ This was a much more productive run toward the goals of MP#409 than the previous one on 1051110 - even if we did blow a couple of hours on a between-shot boronization. The old-style molybdenum probe head on the A-port drive (replacing the shorted-out carbon probe head) performed well. First we recorded parallel and perpendicular flows in standard LSN and USN discharges (0.8 MA, 5.4T), with a two-point density scan. This was to check that the A-port probe was operating the same as other probes of the same design in previous runs. Then we moved on to ohmic H-modes, looking to catch recordings of parallel and perpendicular flow profiles in ELM-free phases. The first two discharge attempts did yield ohmic H-modes, but they were multiple modes of very short duration - difficult to target with the scanning probes. So we decided to perform a between-shot boronization: R=75 to 85 cm, 80 cm dwell, 30 minutes, 100% duty cycle. But, because turbo pump #2 was not operating, the boronization required a manual feedback control of the gas pressure in the torus. Setting this up caused further delay, leading to a 2 hour time interval before the next discharge attempt. Naturally the next three shots were fizzles, causing further delay. When we finally got going again, the ohmic H-modes were only marginally better, if better at all. Nevertheless, we pushed on, targeting the ELM-free phase as best we could and fine-tuning the last closed flux surface target position for optimal probe insertion. After many tries, we did manage to get two good probe insertions into short ELM-free phases (shots 24 and 25). It's a good thing too because we were cutting it very close; shot#26 was the last plasma shot of the day and it yielded no addtional scanning probe data during an H-mode phase. At first glance, the flow data look interesting, with an apparent spatial compression of the velocity shear layer in H-mode relative to L-mode. However, we still need to assess if we can trust the inferred flows. In this regard, it would be beneficial to try to get the 'steep pyramid' probe head (i.e., the carbon probe head) working on the A-port drive for comparison measurements. Hopefully we can do this before the present campaign ends. A reversed Bt run would also help here. Meanwhile we learned something important today: we should perform these ohmic H-mode investigations after a full boronization. The single between-shot boronization that we performed today just didn't help. Interesting side note: John noticed today that as Bt was ramped down in the approach to ohmic H-mode, the toroidal rotation starts counter-current and ramps to near zero. The time that the toroidal rotation velocity becomes zero corresponds closely to the time of ohmic L-H transition. Sound familiar? Quick shot log: Ip=0.8MA, Bt=5.4T 1 - LSN, NL04= 0.54 ASP(-5), FSP(-5) E-sweep, NSW-Vf, no ISP 2 - LSN, NL04= 0.60 ASP(+5), FSP(+3) E-sweep, NSW-Vf, ISP - good targeting 3 - LSN, NL04= 0.75 ASP(+6), FSP(+3) SNE-sweep, W-Vf, ISP 4 - LSN, NL04= 0.75 ASP(+7), FSP(+4) SNE-sweep, W-Vf, ISP - good target, ASP deep on scan 2 5 - fizzle 6 - USN, NL04= 0.76 ASP(+3), FSP(-3) SNE-sweep, W-Vf, ISP- over-inserted! 7 - USN, NL04= 0.77 ASP(+3), FSP(-3) SNE-sweep, W-Vf, ISP-excellent 8 - USN, NL04= 0.8 ASP(+9), FSP(+7) SNE-sweep, W-Vf, ISP-excellent 9 - USN, NL04= 0.8 ASP(+10), FSP(+11) SNE-sweep, W-Vf, ISP all excellent targeting 10 - USN, NL04= 0.62 ASP(+10), FSP(+11) SNE-sweep, W-Vf, ISP all excellent targeting Go to ohmic LSN, H-modes 11 - LSN, NL04= 0.53 ASP(+8?), FSP(+4?) SNE-sweep, W-Vf, ISP (22ms) 0-90 degrees only First L-H at 1.06s 12 - LSN, NL04= 0.53 ASP(+8), FSP(+2) SNE-sweep, W-Vf, ISP (22ms) 0-90 degrees only First L-H at 0.93 s Probes catch H-mode on third scan. Between-shot boronization R=75 to 85 cm, 80 cm dwell, 30 minutes, 100% duty cycle This took about 2 hours, partially because of TMP2 being off and having to come up with a work-around for not using the TC gauge on the TMP2 foreline. 13 - fizzle 14 - fizzle 15 - fizzle 16 - LSN, NL04= 0.65 to 0.78 ASP(+6), FSP(+0) SNE-sweep, W-Vf, ISP (16ms) first L-H at 1.06s Probes catch short H-mode on last scan ** Note: Boronization has done very little to improve the H-modes ** 17 - LSN, NL04= 0.65 to 0.7 ASP(+6), FSP(-2) SNE-sweep, W-Vf, ISP (16ms) first L-H at 0.98s No scans in H-mode. 18 - LSN, NL04= 0.65 to 0.78 ASP(+6), FSP(-2) SNE-sweep, W-Vf, ISP (16ms) first L-H at 1.04s. No probe scans in H-mode 19 - LSN, NL04= 0.58 to 0.6 ASP(+8), FSP(+1) SNE-sweep, W-Vf, ISP (16ms) first L-H at 1s. No probe scans in H-Mode. 20 - LSN, NL04= 0.65 ASP(+7), FSP(+0) SNE-sweep, W-Vf, ISP (16ms) first L-H at 10.99s. No probe scans in H-Mode. 21 - fizzle 22 - fizzle 23 - fizzle 24 - LSN, NL04= 0.55 ASP(+7), FSP(+0) SNE-sweep, W-Vf, ISP (16ms) Targeting is good. first L-H at .82s. Second scan catches H-Mode! 25 - LSN, NL04= 0.6 ASP(+7), FSP(+0) SNE-sweep, W-Vf, ISP (16ms) first L-H at 1s. Third scan catches H-Mode! Great data. 26 - LSN, NL04= 0.6 ASP(+7), FSP(+0) SNE-sweep, W-Vf, ISP (16ms) first L-H at 1.09s. No probe scans in H-Mode. |
| Physics Operator Summaries |
| Entered: Nov 23 2005 05:31:51:800PM |
| Author: Ron Parker |
| Physop Summary
This was an ohmic-only run with the purpose being to expand the data base on the edge phase space. The run went well until shot 12 when boronization was called for. The purpose of the boronization was to encourage ohmic H-modes. There was some difficulty beginning the boronization due to the fact that the thermocouple used to stabile the pressure was inactive. This caused an unexpected delay of about 45 minutes. After resuming, the discharge was much more difficult to start up and there were 3 fizzles before it was restored. As usual with boronization, the fill pressure needed careful tuning to find an operating window. Even after a window was found, a period of several fizzles again occured until a pressure was found that allowed 3 more shots. Fortunately, these shots permitted some useful data to be collected. There was 1 fizzle in 12 shots before boronization, and 6 out of 13 after |
| Session Leader Comments | |||
| Nov 23 2005 09:15:15:320AM | 1051123001 | Brian Labombard | Shot#1 LSN, NL04=0.54, 0.8MA, 5.4T
ASP, FSP scanning at 0..65, 0.85, 1.05s in far SOL Next: repeat with probes deeper and with ISP |
| Nov 23 2005 09:29:03:380AM | 1051123002 | Brian Labombard | Shot#2 LSN, NL04=0.6, 0.8MA, 5.4T
ASP, FSP, ISP scanning at 0.65, 0.85, 1.05s ASP - at separatrix FSP - first scan at sep. ISP - good targeting Next: Repeat with N04=0.8 |
| Nov 23 2005 09:46:04:537AM | 1051123003 | Brian Labombard | Shot#3 LSN, NL04=0.75, 0.8MA, 5.4T
ASP, FSP, ISP scanning at 0.65, 0.85, 1.05s ASP - could be deeper FSP - could be deeper ISP - good Next: Repeat with probes deeper |
| Nov 23 2005 09:53:19:430AM | 1051123004 | Brian Labombard | Shot#4 LSN, NL04=0.75, 0.8MA, 5.4T
ASP, FSP, ISP scanning at 0.65, 0.85, 1.05s ASP - ok FSP - cok ISP - good Next: go to USN |
| Nov 23 2005 10:29:39:117AM | 1051123006 | Brian Labombard | Shot#6 USN, NL04=0.75, 0.87MA, 5.4T
ASP, FSP, ISP scanning at 0.65, 0.85, 1.05s ASP - near sep FSP - far ISP - over-inserted by 6 mm! Next: Adjust gaps and Ip |
| Nov 23 2005 10:40:15:960AM | 1051123007 | Brian Labombard | Shot#7 USN, NL04=0.77, 0.82MA, 5.4T
ASP, FSP, ISP scanning at 0.65, 0.85, 1.05s ASP - far FSP - far ISP - excellent Next: Adjust outer gap and Ip again |
| Nov 23 2005 10:53:36:007AM | 1051123008 | Brian Labombard | Shot#8 USN, NL04=0.8, 0.8MA, 5.4T
ASP, FSP, ISP scanning at 0.65, 0.85, 1.05s ASP - could be deeper FSP - coudl be deeper ISP - excellent Next: Adjust outer gap for Jim with probes deeper |
| Nov 23 2005 11:03:47:223AM | 1051123009 | Brian Labombard | Shot#9 USN, NL04=0.8, 0.8MA, 5.4T
ASP, FSP, ISP scanning at 0.65, 0.85, 1.05s ASP - excellent target FSP - excellent ISP - excellent Next: Go to NL04 = 0.6 |
| Nov 23 2005 11:24:02:553AM | 1051123010 | Brian Labombard | Shot#10 USN, NL04=0.62, 0.8MA, 5.4T
ASP, FSP, ISP scanning at 0.65, 0.85, 1.05s ASP - excellent target FSP - excellent ISP - excellent Next: Go to LSN with Bt ramp-down to get ohmic H-modes |
| Nov 23 2005 12:28:10:927PM | 1051123011 | Brian Labombard | Shot#11 LSN, NL04=0.53, 0.8MA, 5.4T ramping down to 2.9
ASP, FSP, ISP scanning at 0.65, 0.85, 1.05s First L-H at 1.06 s ASP - too far out. FSP - good targting on first scan ISP - excellent Next: Repeat with ZXL ramped down to improve FSP target |
| Nov 23 2005 02:51:55:093PM | 1051123012 | Brian Labombard | Shot#12 LSN, NL04=0.53, 0.8MA, 5.4T ramping down to 2.9
ASP, FSP, ISP scanning at 0.6, 0.85, 1.08s First ohmic L-H at 0.93 s ASP - could be deeper. Last scan in EFH. Evidence of strong perp flows. FSP - targeting improved ISP - excellent, but probe only scans 0-90 degrees Next: Do between-shot boronization 75 to 85 cm sweep, 30 minutes, 100% duty cycle |
| Nov 23 2005 03:07:20:143PM | 1051123016 | Brian Labombard | Shot#16 LSN, NL04=0.65 to 0.78, 0.8MA, 5.4T ramping down to 2.9
ASP, FSP, ISP scanning at 0.6, 0.85, 1.08s First ohmic L-H at 1.06 ASP - ok. Last scan in EFH. Evidence of strong perp flows. FSP - targeting good, last scan is deep ISP - first two scans ok Next: Repeat |
| Nov 23 2005 03:17:35:550PM | 1051123017 | Brian Labombard | Shot#17 LSN, NL04=0.65 to 0.7, 0.8MA, 5.4T ramping down to 2.9
ASP, FSP, ISP scanning at 0.6, 0.85, 1.08s First ohmic L-H at 0.98 ASP - ok. No scans in H-mode FSP - targeting good, last scan is deep ISP - first scan ok Next: Repeat with inner gap change |
| Nov 23 2005 03:34:10:737PM | 1051123018 | Brian Labombard | Shot#18 LSN, NL04=0.65 to 0.73, 0.8MA, 5.4T ramping down to 2.9
ASP, FSP, ISP scanning at 0.6, 0.85, 1.08s First ohmic L-H at 1.04s ASP - ok, could be deeper. No scans in H-mode FSP - could be deeper ISP - could be deeper Next: Repeat with gap change and probes deeper. |
| Nov 23 2005 03:46:03:157PM | 1051123019 | Brian Labombard | Shot#19 LSN, NL04=0.58 to 0.6, 0.8MA, 5.4T ramping down to 2.9
ASP, FSP, ISP scanning at 0.6, 0.85, 1.08s First ohmic L-H at 1s ASP - ok. No scans in H-mode - missed it again. FSP - ok ISP - could be deeper Next: Repeat with reduced inner gap |
| Nov 23 2005 03:57:30:207PM | 1051123020 | Brian Labombard | Shot#20 LSN, NL04=0.65, 0.8MA, 5.4T ramping down to 2.9
ASP, FSP, ISP scanning at 0.6, 0.85, 1.03s First ohmic L-H at .99s ASP - ok. No scans in H-mode - missed it. FSP - ok ISP - ok Next: Repeat |
| Nov 23 2005 05:02:09:910PM | 1051123024 | Brian Labombard | Shot#24 LSN, NL04=0.55, 0.8MA, 5.4T ramping down to 2.9
ASP, FSP, ISP scanning at 0.6, 0.85, 1.03s First ohmic L-H at .82s ASP - ok. Second scan catches H-Mode! best data today. FSP - ok ISP - ok Next: Repeat |
| Nov 23 2005 05:04:08:847PM | 1051123025 | Brian Labombard | Shot#25 LSN, NL04=0.6, 0.8MA, 5.4T ramping down to 2.9
ASP, FSP, ISP scanning at 0.6, 0.85, 1.03s First ohmic L-H at 1s ASP - ok. Third scan catches H-Mode! Very nice data! FSP - ok ISP - ok Next: Repeat |
| Nov 23 2005 05:35:19:080PM | 1051123026 | Brian Labombard | Shot#26 LSN, NL04=0.6, 0.8MA, 5.4T ramping down to 2.9
ASP, FSP, ISP scanning at 0.6, 0.85, 1.03s First ohmic L-H at 1.09s ASP - ok. No probe scan in H-mode FSP - ok ISP - ok End of run. |
| Physics Operator Comments | |||
| Nov 23 2005 09:03:37:553AM | 1051123001 | Ron Parker | First shot will be loaded from 1051110009. Startup may need to be touched up. |
| Nov 23 2005 09:16:17:583AM | 1051123001 | Ron Parker | Shot 001 went off as programmed. Breakdown a bit late, Bz a bit too negative,reduce by 25 A for next shot. |
| Nov 23 2005 09:33:48:990AM | 1051123002 | Ron Parker | Shot 002 ran OK. Next: Raise density to n_eL(4) to 0.8 m-2.
Also reduce fill by 4 ms, set EF 4 current to -1335 from -1325. |
| Nov 23 2005 09:41:25:117AM | 1051123003 | Ron Parker | Shot 003 ran OK at n_el(4) at 0.8 m-2.
Need to run shot again, no changes. |
| Nov 23 2005 09:53:33:257AM | 1051123004 | Ron Parker | Shot 004 ran OK.
Now for something new: upper single null on next shot. Also reduce gas by 2 ms for earlier breakdown. |
| Nov 23 2005 10:06:09:100AM | 1051123005 | Ron Parker | Shot 005 fizzled -- why? Prefill was slightly lower than in shot 004 and breakdown was very late. We'll put back 3 ms on next shot. |
| Nov 23 2005 10:31:43:677AM | 1051123006 | Ron Parker | Shot 006 ran but current reached 900 kA instead of programmed 800.
Also inner gap was only 7 mm and we want 13, so clearin was increased by 6 mm. With fixed Rcur this will also reduce outer gap by 6 mm. |
| Nov 23 2005 10:40:57:413AM | 1051123007 | Ron Parker | Shot 007 ran well, current was a bit high so we'll reduce by 20 kA for next shot.
Breakdown was at ~ 5 ms. Also, right gap will be increased by 2 mm (Rcur decreased by 1mm and flattened.) |
| Nov 23 2005 10:50:51:850AM | 1051123008 | Ron Parker | Shot 8 ran well. Outer gap decreases by ~ 3 mm from 1 to 1.3 s. We'll try to take this out on next shot. Otherwise no change.
|
| Nov 23 2005 11:01:46:787AM | 1051123009 | Ron Parker | Shot 9 ran OK. Next: Lower density, to n_el(4)=0.6e20 m-2. |
| Nov 23 2005 11:23:28:663AM | 1051123010 | Ron Parker | Shot 10 ran well, data look good.
Next: Back to LN, 800 kA, H-mode by ramping field down to ~ 2.7 T. |
| Nov 23 2005 11:39:12:897AM | 1051123011 | Ron Parker | Shot 11 ran well with intermittent H-modes.
Next: lower X-point seems to drift up during shot. We'll try to correct out on next shot. |
| Nov 23 2005 02:05:07:617PM | 1051123012 | Ron Parker | Shot 12 ran well, landing a little softer.
H-mode not steady enough, so we are shutting down for a light boronization. This means a delay of about 1 hour before next shot. Boronization was delayed due to inoperative TC gauge normally used to control pressure. Work around was to control open loop. Total delay looks like 1.5 hours. Boronization follows procedure used on 11/21/05: 10% deuterated diborane, 90% helium 30 minutes, 100% duty factor, scan 75, 80 dwell, 85 cm We will also tune the vertical position and outer gap to allow probe to reach proper depth. We'll start the shot when the base pressure reaches 2e-6 Torr |
| Nov 23 2005 02:22:32:657PM | 1051123013 | Ron Parker | Shot 13 was a fizzle, not unexpected.
touch up the error fields on next shot, although breakdown was good. |
| Nov 23 2005 02:26:31:307PM | 1051123014 | Ron Parker | Shot 14 also fizzled, breakdown also was somewhat later than in shot 13.
Now we'll start to reduce pressure, 2 ms at a time (to 29 ms on next shot) |
| Nov 23 2005 02:39:41:063PM | 1051123015 | Ron Parker | Shot 15 also fizzled, although breakdown was reasonable.
Next: Gas reduced to 27 ms. |
| Nov 23 2005 03:18:14:847PM | 1051123016 | Ron Parker | Shot 16 ran well. |
| Nov 23 2005 03:20:09:423PM | 1051123017 | Ron Parker | Shot 17 ran OK, but clearin change did not get loaded. Intermitttent H-mode. |
| Nov 23 2005 03:44:21:987PM | 1051123019 | Ron Parker | Shot 19 wasn't bad, more sustained H-mode near end.
Next: reduce gas to 25 ms. Also Clearin reduce by 1 mm across the board. |
| Nov 23 2005 04:02:57:470PM | 1051123020 | Ron Parker | Shot 20 went off OK, H-mode sustained at end. |
| Nov 23 2005 04:05:11:157PM | 1051123021 | Ron Parker | Shot 21 fizzled. Cell access to close diborane valve before next shot |
| Nov 23 2005 04:24:29:720PM | 1051123022 | Ron Parker | Shot 22 fizzled. Good breakdown, maybe needs more gas? Bring gas back to 27 ms from 25. |
| Nov 23 2005 04:39:37:173PM | 1051123023 | Ron Parker | Another fizzle. Good breakdown, but current won't take off.
Keep trying. Add 2 more ms to gas, bringing it to 29 ms. Reduce Br by 0.2 mT |
| Nov 23 2005 04:45:05:627PM | 1051123024 | Ron Parker | Shot 024 finally went, H-modes intermittent. It appears that increased gas helps by slowing down current rise. |
| Nov 23 2005 04:56:33:063PM | 1051123025 | Ron Parker | Shot 25 went off OK. Again, intermittent H-modes. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 09:05:11:647AM | Plasma | Ok | |
| 2 | 09:19:50:333AM | Plasma | Ok | |
| 3 | 09:34:10:960AM | Plasma | Ok | |
| 4 | 09:46:43:223AM | Plasma | Ok | |
| 5 | 09:59:35:723AM | Plasma | Ok | |
| 6 | 10:12:36:070AM | Plasma | Ok | |
| 7 | 10:29:47:380AM | Plasma | Ok | |
| 8 | 10:42:39:787AM | Plasma | Ok | |
| 9 | 10:55:37:617AM | Plasma | Ok | |
| 10 | 11:08:28:303AM | Plasma | Ok | |
| 11 | 11:22:55:553AM | Plasma | Ok | |
| 12 | 11:39:52:787AM | Plasma | Ok | |
| 13 | 02:05:12:973PM | Plasma | Ok | |
| 14 | 02:19:15:693PM | Plasma | Ok | |
| 15 | 02:32:05:873PM | Plasma | Ok | |
| 16 | 02:44:53:970PM | Plasma | Ok | |
| 17 | 03:05:21:207PM | Plasma | Ok | |
| 18 | 03:18:16:550PM | Plasma | Ok | |
| 19 | 03:32:06:877PM | Plasma | Ok | |
| 20 | 03:45:14:860PM | Plasma | Ok | |
| 21 | 03:58:20:860PM | Plasma | Ok | |
| 22 | 04:13:56:190PM | Plasma | Ok | |
| 23 | 04:27:39:877PM | Plasma | Ok | |
| 24 | 04:40:32:393PM | Plasma | Ok | |
| 25 | 04:53:41:907PM | Plasma | Ok | |
| 26 | 05:06:30:547PM | Plasma | Ok | |