| Miniproposals | ||||||||||
|
| Operators | |
| Session leader(s): | Brian Labombard |
| Physics operator(s): | Robert Granetz |
| Engineering operator(s): | Ed Fitzgerald,Gary Dekow,Bill Parkin |
| Engineering Operator Run Comment |
| MP#409 MP#406 PO:Granetz SL:Labombarr EO:Fitzgerald,dekow,Parkin |
| Session Leader Plans |
| Entered: Nov 9 2005 09:59:33:803PM |
| Author: Brian Labombard |
Session Leader Run Plan for 1051110
MP#409 "SOL Phase space studies" and MP#406 "Test of new scanning Mach-probe geometry"
Goals
The goals of today's run are threefold: (1) make productive use of ohmic discharges
that are available early in the campaign when H/D ratios are high (this restricts experiments
with RF heating) and boronization has not yet been performed, (2) test another new probe
geometry for the A-port scanning probe (installed on 11/07/05 - this will provide design
guidance for the new inner wall WASP probe), and (3) make progress towards completing
MP#409 "SOL Phase space studies". The goals of MP#409 are to map out the 'phase space'
of the SOL plasma, i.e. the relationships between the 'transport state' (profile shapes,
gradients, cross-field fluxes, advection velocities, turbulence characteristics) and
theory-based 'control parameters' (local collisionality, magnetic field strengths,
parallel connection length,...) that may determine that state.
Shot Sequence Outline
A. First we will dial-up some standard 0.8 MA lower single null and upper single
null discharges with a rough density scan. This will allow us to cross-check profile
measurements made by the new scanning probe geometry against previous data taken by
the old probe.
B. Then we will attempt to run some ohmic H-modes using the usual ramp-down
and ramp-up of the toroidal field (EDA is desired). It will be interesting see if
the probe is able to record changes in cross-field flows in the shear layer in H vs
L-mode (assuming that the probe works). The impurity behavior of ohmic H-modes (prior to
boronization) is also of interest as we are thinking of using ohmic H-modes as a
diagnostic tool for first-boronization discharges during this fall campaign.
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#1050304024. This shot ran on segment#2. It was a LSN discharge
with Ip=0.8 MA, Bt= 5.4 tesla, NL04 = 0.9e20. 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
1,2 LSN, NL04 = 0.6, Scan mode, optimize probe insertion
NINJA puff at 1.1 s, fast camera at 1.25 s
3,4 USN, NL04 = 0.6, Scan mode, optimize probe insertion
NINJA puff at 1.1 s, fast camera at 1.25 s
5 USN, NL04 = 0.4, Scan mode
NINJA puff at 1.1 s, fast camera at 1.25 s
6 LSN, NL04 = 0.4, Scan mode
NINJA puff at 1.1 s, fast camera at 1.25 s
8 LSN, NL04 = 0.8, Scan mode
NINJA puff at 1.1 s, fast camera at 1.25 s
9 USN, NL04 = 0.8, Scan mode
NINJA puff at 1.1 s, fast camera at 1.25 s
10 USN, NL04 = 1.0, Scan mode
NINJA puff at 1.1 s, fast camera at 1.25 s
11 LSN, NL04 = 1.0, Scan mode
NINJA puff at 1.1 s, fast camera at 1.25 s
Plan B - Ohmic H-modes
Use LSN program from above. Reprogram Bt to ramp down and up, as in shot#1000915019.
Reprogam NL04 = 0.65e20
Shots
12-16 Optimize probe insertions and depths to catch ELM-free and EDA phases
Plan C - Begin 4 tesla, 0.8 MA density scan
Reload from shot#11 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
17,18 LSN, NL04 = 0.6, Scan mode, optimize probe insertion
NINJA puff at 1.1 s, fast camera at 1.25 s
19,20 USN, NL04 = 0.6, Scan mode, optimize probe insertion
NINJA puff at 1.1 s, fast camera at 1.25 s
21 USN, NL04 = 0.4, Scan mode
NINJA puff at 1.1 s, fast camera at 1.25 s
22 LSN, NL04 = 0.4, Scan mode
NINJA puff at 1.1 s, fast camera at 1.25 s
23 LSN, NL04 = 0.8, Scan mode
NINJA puff at 1.1 s, fast camera at 1.25 s
24 USN, NL04 = 0.8, Scan mode
NINJA puff at 1.1 s, fast camera at 1.25 s
|
| Physics Operators Plans |
| Entered: Nov 9 2005 09:25:38:350PM |
| Author: Robert Granetz |
Engineering setup for Thursday 10 Nov 2005
MP#409: SOL Phase Space and
MP#406: Test of new scanning Mach-probe geometry
Session leader: B. Labombard
Physics operator: R. Granetz
Overnight ECDC in D2 (not helium), and bake at 60 C.
Run begins at 09:00 and ends at 17:00.
Power systems as on 1050304024 (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 Leave DISABLED
Enable the following gate valves and shutters, assuming no vacuum problems:
ECE, VUV, Z-bolo shutters
Torvac setup: Gate valves open
No between-shot boronization.
Important Diagnostics: ASP, FSP, ISP, Xybion camera, fast H-alpha diode
array, Chromex, Edge TS
-------------------------------------------------------------------------------
ICRF Setup: No RF today; piggybacking is NOT compatible with this run.
-------------------------------------------------------------------------------
Run plan: The goals of today's run are threefold:
(1) Make productive use of ohmic discharges that are available earily in
the campaign when H/D ratios are high (this restricts experiments with
RF heating) and boronization has not yet been performed,
(2) Test another new probe geometry for the A-port scanning probe
(installed on 11/07/05 - this will provide design guidance for the new
inner wall WASP probe), and
(3) Make progress towards completing MP#409 "SOL Phase space studies".
|
| Session Leader Summaries |
| Entered: Nov 10 2005 11:28:57:543PM |
| Author: Brian Labombard |
Run Summary for 1051110 MP#409 "SOL Phase space studies" and MP#406 "Test of new scanning Mach probe geometry" ___________________________________________________________________________________ The tokamak performed very well today - 28 plasma shots. This would have been a really great run to collect a load of data for MP#409. Unfortunately, the new scanning Mach probe on the A-port drive did not perform well at all. The new probe head features a different geometry than the previous versions and is made of out of ATJ graphite (compared to molybdenum for previous probes). The hope was to get improved heat-handling performance during off-normal events by avoiding the formation of the melt layer that shorts out the probe tips on the molybdenum-based probes. The inner wall scanning probe (ISP) is a good example. It is made out of a carbon fiber weave material that has proven to be remarkably robust, surviving deep probe insertions beyond the separatrix (i.e., operator errors!). However, we knew from previous experience with probes tested on the A-port drive, that carbon redeposition on the head might also short out the electrodes - if the carbon could deposit deep in the gaps between electrode and head where plasma could not reach. The new design attempted to eliminate these locations by bringing the insulation material (AlO2) flush with the probe body. However, the design modification was not able to keep the shorts from forming and we spent the entire run trying to 'burn-off' electrical shots between the body and electrodes. By shot 10, we realized that the electrical shorts on the new probe may never be eliminated. So we punted on taking data for MP#409 and moved onto dialing up some ohmic H-modes. Using the usual recipe of ramping Bt down to about 3 tesla (0.8 MA discharges), we were able to access ELM-free ohmic H-modes. We tried without success to get some EDA H-modes by ramping up Bt or ramping down Ip, once the H-mode formed. Nevertheless, these discharges (or higher current ones) may prove useful for studying changes in impurity source strengths as boronization is applied in a systematic way. The carbon probe head on the A-port drive was replaced with a standard molybdenum one after the run. It should be ready to go for tuesday's run, next week. Final note: We have not given up entirely on the carbon probe head, and may be back for another go during this campaign. We would like to try to develop an option for a carbon probe head before we commit to a final design for Noah's new inner wall scanning probe (WASP). Quick shot log: 1 - LSN, NL04= 0.56 no probes scanning. 2 - LSN, NL04= 0.56, ASP(0), FSP(-5), ISP, at 0.65, 0.85, 1.05 - ASP TR16s were off 3 - LSN, NL04= 0.6, ASP(+5), FSP(0), ISP, at 0.65, 0.85, 1.05 - ASP a bit deep. 4 - LSN, NL04= 0.6, ASP(+3), FSP(0), ISP, at 0.65, 0.85, 1.05 - ASP cleaing up 5 - LSN, NL04= 0.6, ASP(+3), FSP(0), ISP, at 0.65, 0.85, 1.05 - ASP cleaning up, FSP good target, ISP great 6 - LSN, NL04= 0.6, ASP(+3), FSP(0), ISP, at 0.65, 0.85, 1.05 7 - LSN, NL04= 0.6, ASP(+3), FSP(0), ISP, at 0.65, 0.85, 1.05 8 - LSN, NL04= 0.58, ASP(+6), FSP(0), ISP, at 0.65, 0.85, 1.05 9 - LSN, NL04= 0.58, ASP(+6), FSP(0), ISP, at 0.65, 0.85, 1.05 10 - LSN, NL04= 0.67, Bt ramp to 3.2T and back up, ASP(+6), FSP(0), ISP, at 0.65, 0.85, 1.05 - ohmic H-mode attempt, no H-modes 11 - LSN, NL04= 0.62, Bt ramp to 3T and back up, ASP(+7), FSP(0), ISP, at 0.65, 0.85, 1.05 - ohmic H-mode attempt, no H-modes 12 - LSN, NL04= 0.65, Bt ramp to 3T, ASP(+5), FSP(0), ISP, at 0.65, 0.85, 1.05 - got multiple H-modes, no NINJA 13 - LSN, NL04= 0.57, Bt ramp to 3T, ASP(+5), FSP(0), ISP, at 0.65, 0.85, 1.05 - H-L-H-L dispution, no NINJA 14 - LSN, NL04= 0.53, Bt ramp to 3T, ASP(+5), FSP(0), ISP, at 0.65, 0.85, 1.05 - many H-modes, no NINJA 15 - LSN, NL04= 0.58, Bt ramp to 3T, ASP(+5), FSP(0), ISP, at 0.65, 0.85, 1.05 - got multiple H-modes with NINJA 16 - LSN, NL04= 0.55, Bt ramp to 3T, ASP(+5 dwell mode), FSP(0), ISP, at 0.65, 0.85, 1.05, intermittent H-Ls, with NINJA 17 - LSN, NL04= 0.56, Bt ramp to 3T, ASP(+5 SCAN mode), FSP(0), ISP, at 0.65, 0.85, 1.05, multiple H-L, with NINJA 18 - LSN, NL04= 0.6, Bt ramp to 3T, ASP(+5 dwell mode), FSP(0), ISP, at 0.65, 0.85, 1.05, H-Ls, disrupts 1.36 19 - LSN, NL04= 0.6, Bt ramp to 3T and then up, ASP(-5 dwell mode), ISP, at 0.65, 0.85, 1.05, one short H-mode 20 - LSN, NL04= 0.6, Bt ramp to 3T and then up, ASP(-5 dwell mode), ISP, at 0.65, 0.85, 1.05, tiny H-mode, disrupts at 1s 21 - LSN, NL04= 0.58, Bt ramp to 3T, ASP(-5 dwell mode), ISP, at 0.65, 0.85, 1.05, multiple H-L 22 - fizzle 23 - power test 24 - LSN, NL04= 0.6, Bt ramp to 3T, ASP(0 dwell mode), two H-modes late 25 - LSN, NL04= 0.6, Bt ramp to 3T, ASP(+2 dwell mode), a few H-modes 26 - LSN, NL04= 0.6, Bt ramp to 3T, ASP(-2 scan mode) 27 - LSN, NL04= 0.6, Bt ramp to 3T, ASP(-2 scan mode) 28 - LSN, NL04= 0.6, Bt ramp to 3T, ASP(-2 scan mode) 29 - LSN, NL04= 0.57, Bt ramp to 3T, ASP(-2 scan mode) Ramped down Ip after 1s, two H-mode, no EDA 30 - LSN, NL04= 0.6, Bt ramp to 3T, ASP(-2 scan mode) Ramped down Ip after 1s, Argon/Neon off, couple H-modes 31 - fizzle |
| Physics Operator Summaries |
| Entered: Nov 10 2005 05:02:56:023PM |
| Author: Robert Granetz |
Physics operator summary for Thursday 10 Nov 2005:
MP#409: SOL Phase Space and
MP#406: Test of new scanning Mach-probe geometry
Session leader: B. Labombard
Physics operator: R. Granetz
The tokamak ran extremely well today, with only two fizzles and no duds.
We managed to get ELMfree ohmic H-modes reliably by ramping the field down
to 3.0 T (Ip=0.8 MA). We also tried various tricks to try and convert the
short ELMfree ohmic H-modes into longer, steadier ohmic H-modes, but
without noticeable success.
Brian reports that the new carbon-body ASP didn't work as well as he had
hoped, and didn't seem to be improving during the run. See Brian's report
for details on the probe scan results.
I was constantly monitoring the OH2U coax resistance, which never got to
the worrisome level. After our first fizzle on shot 22, we did an OH+TF
test on shot 23 (under PLC control) with the OH in the reverse condition
(i.e. positive current on the OH Rogowski), which gave us a steady reading
of 2.0 micro-ohms. The next shot (24) was a normal plasma with the same
OH2U coax resistance and previous shots today.
Scorecard: 28 plasmas
0 duds
2 fizzles
1 power supply test
--------------
Total: 31 shot cycles
|
| Session Leader Comments | |||
| Nov 10 2005 03:15:54:617PM | 1051110001 | Brian Labombard | Shot 1 0.8 MA, 5.4 T LSN NL04 = 0.6 No probes scanning. |
| Nov 10 2005 03:16:55:383PM | 1051110002 | Brian Labombard | Shot 2 0.8 MA, 5.4T LSN NL04 = 0.56 ASP, FSP, ISP scanning at 0.65, 0.85, 1.05s ASP - some tree nodes were off FSP - could be deeper ISP - looks good Next: repeat |
| Nov 10 2005 03:17:32:850PM | 1051110003 | Brian Labombard | Shot 3 0.8 MA, 5.4T LSN NL04 = 0.6 ASP, FSP, ISP scanning at 0.65, 0.85, 1.05s ASP - arcing, but cleaning up FSP - could be deeper ISP - looks great Next: repeat |
| Nov 10 2005 03:18:03:400PM | 1051110004 | Brian Labombard | Shot 4 0.8 MA, 5.4T LSN NL04 = 0.6 ASP, FSP, ISP scanning at 0.65, 0.85, 1.05s ASP - arcing, but cleaning up FSP - could be deeper ISP - looks great Next: repeat |
| Nov 10 2005 03:18:33:257PM | 1051110005 | Brian Labombard | Shot 5 0.8 MA, 5.4T LSN NL04 = 0.6 ASP, FSP, ISP scanning at 0.65, 0.85, 1.05s ASP - cleaning up FSP - ok ISP - looks great Next: repeat |
| Nov 10 2005 11:09:50:303AM | 1051110006 | Brian Labombard | Shot 6 0.8 MA, 5.4T LSN NL04 = 0.6 ASP, FSP, ISP scanning at 0.65, 0.85, 1.05s ASP - cleaning up FSP - ok ISP - looks great The A-port probe is taking a long time to clean up, causing a delay in the run plan. Next: Repeat |
| Nov 10 2005 11:19:30:710AM | 1051110007 | Brian Labombard | Shot 7 0.8 MA, 5.4T LSN NL04 = 0.6 ASP, FSP, ISP scanning at 0.65, 0.85, 1.05s ASP - cleaning up FSP - ok ISP - looks great ASP Still cleaning up. Next shot: Plunge probe deeper in the hopes of cleaning it up more quickly. |
| Nov 10 2005 11:42:30:587AM | 1051110008 | Brian Labombard | Shot 8 0.8 MA, 5.4T LSN NL04 = 0.6 ASP, FSP, ISP scanning at 0.65, 0.85, 1.05s ASP - getting a little better FSP - ok ISP - looks great Next shot: repeat |
| Nov 10 2005 11:43:25:227AM | 1051110009 | Brian Labombard | Shot 9 0.8 MA, 5.4T LSN NL04 = 0.6 ASP, FSP, ISP scanning at 0.65, 0.85, 1.05s ASP - getting a little better FSP - ok ISP - looks great Next shot: Change Bt programming to attempt to get ohmic H-modes |
| Nov 10 2005 12:07:35:117PM | 1051110010 | Brian Labombard | Shot 10 0.8 MA, Bt ramp, LSN NL04 = 0.6 ASP, FSP, ISP scanning at 0.65, 0.85, 1.05s No H-mode ASP - still cleaning up FSP - ok ISP - looks great Next shot: Repeat, ramping to lower Bt |
| Nov 10 2005 12:16:08:023PM | 1051110011 | Brian Labombard | Shot 11 0.8 MA, Bt ramp down to 3T, LSN NL04 = 0.6 ASP, FSP, ISP scanning at 0.65, 0.85, 1.05s No H-mode ASP - cleaning up FSP - ok ISP - looks great Next shot: Repeat, ramping to Bt = 3T and then holding at 3T |
| Nov 10 2005 12:41:25:820PM | 1051110012 | Brian Labombard | Shot 12 0.8 MA, Bt ramp down to 3T and hold, LSN NL04 = 0.6 ASP, FSP, ISP scanning at 0.65, 0.85, 1.05s Multiple H-L-H-L modes ASP - not clean yet FSP - ok ISP - ok Next shot: Repeat |
| Nov 10 2005 12:43:37:947PM | 1051110013 | Brian Labombard | Shot 13 0.8 MA, Bt ramp down to 3T and hold, LSN NL04 = 0.6 A couple H-Ls, Disrupts at 1.02 ASP, FSP, ISP scanning at 0.65, 0.85, 1.05 ASP - not clean yet FSP - ok ISP - ok Next shot: Repeat |
| Nov 10 2005 01:03:59:820PM | 1051110014 | Brian Labombard | Shot 14 0.8 MA, Bt ramp down to 3T and hold, LSN NL04 = 0.6 Many H-Ls, ASP, FSP, ISP scanning at 0.65, 0.85, 1.05 ASP - not clean yet FSP - ok ISP - ok Next shot: Repeat with NINJA |
| Nov 10 2005 01:08:54:007PM | 1051110015 | Brian Labombard | Shot 15 0.8 MA, Bt ramp down to 3T and hold, LSN NL04 = 0.6 Many H-Ls, ASP, FSP, ISP scanning at 0.65, 0.85, 1.05 ASP - not clean yet FSP - ok ISP - ok Next shot: Repeat with ASP in dwell mode, 5 mm from separatrix |
| Nov 10 2005 01:38:57:193PM | 1051110016 | Brian Labombard | Shot 16 0.8 MA, Bt ramp down to 3T and hold, LSN NL04 = 0.6 H-L-H-L, ASP DWELL, FSP, ISP scanning at 0.65, 0.85, 1.05 ASP - not clean yet FSP - ok ISP - ok Next shot: Repeat with ASP in scan mode |
| Nov 10 2005 01:38:25:710PM | 1051110017 | Brian Labombard | Shot 17 0.8 MA, Bt ramp down to 3T and hold, LSN NL04 = 0.6 H-L-H-L, ASP, FSP, ISP scanning at 0.65, 0.85, 1.05 ASP - not clean yet FSP - ok ISP - ok Next shot: Repeat with ASP in dwell mode |
| Nov 10 2005 02:19:12:413PM | 1051110018 | Brian Labombard | Shot 18 0.8 MA, Bt ramp down to 3T and hold, LSN NL04 = 0.6 H-L-H-L, disruption. ASP in DWELL mode, ISP scanning at 0.65, 0.85, 1.05 ASP - not clean yet FSP - ok ISP - ok Next shot: Add Bt ramp-up to try to get EDA H-mode. Reduce outer gap. |
| Nov 10 2005 02:18:37:117PM | 1051110019 | Brian Labombard | Shot 19 0.8 MA, Bt ramp down to 3T and hold, LSN NL04 = 0.6 H-L-H-L ASP in DWELL mode, ISP scanning at 0.65, 0.85, 1.05 ASP - not clean yet FSP - ok ISP - ok Next shot: Repeat with tweak in Bt ramp-up. |
| Nov 10 2005 03:25:59:180PM | 1051110024 | Brian Labombard | Shot 24 0.8 MA, Bt ramp down to 3T and hold, LSN NL04 = 0.6 Two H-modes late ASP in DWELL mode. SOUTH probe is still shorted. Next shot: Repeat |
| Nov 10 2005 03:44:24:007PM | 1051110025 | Brian Labombard | Shot 25 0.8 MA, Bt ramp down to 3T and hold, LSN NL04 = 0.6 A few H-modes ASP in DWELL mode. SOUTH probe is still shorted. Next shot: Repeat |
| Nov 10 2005 03:57:32:180PM | 1051110026 | Brian Labombard | Shot 26 0.8 MA, Bt ramp down to 3T and hold, LSN NL04 = 0.6 H-modes ASP in DWELL mode. Maybe more electrodes are now shorted. Next shot: Repeat with probe scanning. |
| Nov 10 2005 04:29:59:227PM | 1051110027 | Brian Labombard | Shot 27 0.8 MA, Bt ramp down to 3T and hold, LSN NL04 = 0.6 H-modes ASP scanning at 0.65, 0.85, 1.05s. Electrodes intermittently shorting. Next shot: Repeat with probe scanning, using DC- supplies |
| Nov 10 2005 04:29:32:273PM | 1051110028 | Brian Labombard | Shot 28 0.8 MA, Bt ramp down to 3T and hold, LSN NL04 = 0.6 Ohmic H-modes ASP scanning at 0.65, 0.85, 1.05s. Intermittent shorts. Next shot: Repeat, with current ramping down after 1.0s |
| Nov 10 2005 05:26:32:757PM | 1051110029 | Brian Labombard | Shot 29 0.8 MA, Bt ramp down to 3T and hold, LSN NL04 = 0.6 Ohmic H-modes ASP scanning at 0.65, 0.85, 1.05s. Intermittent shorts. Next shot: Repeat, without argon/neon |
| Nov 10 2005 05:26:56:197PM | 1051110030 | Brian Labombard | Shot 30 0.8 MA, Bt ramp down to 3T and hold, LSN NL04 = 0.6 Ohmic H-modes ASP scanning at 0.65, 0.85, 1.05s. Intermittent shorts. |
| Physics Operator Comments | |||
| Nov 10 2005 08:17:43:953AM | Robert Granetz | Loaded DPCS from shot 1050304024 (0.8 MA, 5.4 T, 1.0e20 m-2, SNL), and then reloaded segment 1 from last shot yesterday (1051109024). Since segment 2 was from early in 2005, I had to "call" all the magnetics-relevant wires to get the swapped BP16 and ROG signals correctly implemented, and also to zero the offsets in CLEARIN and IP. I also reduced the Ar/Ne puff to 50 ms. | |
| Nov 10 2005 08:24:37:110AM | Robert Granetz | Also, for the first shot, I decreased the programmed density to nl_04 = 0.6e20 m-2. | |
| Nov 10 2005 09:21:24:610AM | 1051110001 | Robert Granetz | Plasma. Good shot. Very, very late breakdown, but the current rise looks good. Next shot: reduce CLEARIN by 2.5 mm, tweak RCUR after t=1.1 s. Leave pre-fill unchanged at 34 ms. |
| Nov 10 2005 09:46:56:940AM | 1051110002 | Robert Granetz | Plasma. Good shot. Good inboard and outboard gaps. Next shot: no changes. Repeat for Brian's data acquisition. |
| Nov 10 2005 09:54:38:203AM | 1051110003 | Robert Granetz | Plasma. Good shot. Density is still remaining good and low. Next shot: reduce pre-fill by 2 ms (to 32 ms). |
| Nov 10 2005 10:28:04:267AM | 1051110004 | Robert Granetz | Plasma. Good shot. Cell access after this shot for Jim Terry. Next shot: add 1 ms back to pre-fill because there were some outward bounces on this shot. |
| Nov 10 2005 10:44:31:893AM | 1051110005 | Robert Granetz | Plasma. Good shot. The argon/neon was enabled for the first time on this shot (50 ms). Next shot: reduce Ar/Ne put to 40 ms, since the shot didn't make it all the way through the rampdown. |
| Nov 10 2005 11:05:32:800AM | 1051110006 | Robert Granetz | Plasma. Good shot. Some hard x-rays. Next shot: no changes. |
| Nov 10 2005 11:09:43:130AM | 1051110007 | Robert Granetz | Plasma. Good shot. Some runaways again. Next shot: add 1 more ms to the pre-fill |
| Nov 10 2005 11:31:35:850AM | 1051110008 | Robert Granetz | Plasma. Good shot. Still some hard x-rays. Next shot: add 1 more ms to pre-fill. |
| Nov 10 2005 11:44:55:663AM | 1051110009 | Robert Granetz | Plasma. Good shot. Next shot: Try for ohmic H-mode by programming in a partial rampdown of Btor, and then ramp it back up a bit to try and keep the H-mode. The Btor voltage programming was copied from segment 2 of 1000915019. |
| Nov 10 2005 11:59:46:400AM | 1051110010 | Robert Granetz | Plasma. Good shot. No ohmic H-mode though. Next shot: ramp Btor down even more (to 3.0 T) during the shot. |
| Nov 10 2005 12:11:50:243PM | 1051110011 | Robert Granetz | Plasma. Good shot, but still no ohmic H-mode. Next shot: keep Btor down at 3.0 T for the remainder of the shot, rather than raising back up slightly. |
| Nov 10 2005 12:31:15:383PM | 1051110012 | Robert Granetz | Plasma. Good shot, and we got a bunch of short ohmic H-modes!! But the shot disrupted just at the end of programmed flattop. Next shot: repeat, no changes |
| Nov 10 2005 12:37:42:977PM | 1051110013 | Robert Granetz | Plasma. Disrupted at t=1.02 s during an ohmic H-mode and just before the third probe scan. Next shot: repeat, except reduce Ar/Ne puff to 30 ms. |
| Nov 10 2005 12:53:23:400PM | 1051110014 | Robert Granetz | Plasma. Good shot. Lots of short ohmic H-modes. Next shot: repeat, no changes |
| Nov 10 2005 01:03:14:803PM | 1051110015 | Robert Granetz | Plasma. Good shot. Ohmic H-modes. Disrupted at t=1.51 s. Hard x-rays. Next shot: repeat, no changes. |
| Nov 10 2005 01:17:44:367PM | 1051110016 | Robert Granetz | Plasma. Good shot. More ohmic H-modes. Made it part way down rampdown. Next shot: repeat, no changes. |
| Nov 10 2005 01:28:16:913PM | 1051110017 | Robert Granetz | Plasma. Good shot. Ohmic H-modes. Next shot: repeat, no changes. |
| Nov 10 2005 01:47:53:947PM | 1051110018 | Robert Granetz | Plasma. Disrupted at t=1.36 s. Next shot: ramp the Btor back up to 3.6 T late in the shot to try and convert the ELMfree ohmic H-modes to EDA. Also reduce Ar/Ne puff to 20 ms. Also increase RCUR by 5 mm to reduce the outer gap by 1 cm. |
| Nov 10 2005 02:03:04:883PM | 1051110019 | Robert Granetz | Plasma. Good shot. Made it halfway down rampdown. Outer gap reduced by 1 cm, as requested. Inner gap stayed the same, also as requested. There was only one short ohmic H-mode, then it reverted back to L-mode as soon as the slight rampup in Btor occurs. Next shot: delay the upramp by a bit to see if we get a more robust H-mode that sticks around for the upramp. |
| Nov 10 2005 02:19:09:820PM | 1051110020 | Robert Granetz | Plasma. Disrupted at t=1.00 s. Next shot: Remove the Btor upramp. Just leave it down at 3.0 T for the remainder of the shot. |
| Nov 10 2005 02:29:53:303PM | 1051110021 | Robert Granetz | Plasma. Good shot. Ohmic H-modes. Next shot: repeat, no DPCS changes. |
| Nov 10 2005 02:44:30:023PM | 1051110022 | Robert Granetz | Fizzle. First one of the day. Next shot: OH and TF only, with OH in reverse direction (positive Rogowski signal), to try and push together the OH2U coax contacts. |
| Nov 10 2005 03:11:53:663PM | 1051110023 | Robert Granetz | Test of OH2U coax resistance, using OH's and TF only, under PLC control. OH2U coax resistance = 2.0 micro-ohms. Next shot: back to plasma operation. Add +10 amps to IC_EF4 |
| Nov 10 2005 03:25:15:303PM | 1051110024 | Robert Granetz | Plasma. Good shot. Ohmic H-modes late in the flattop. OH2U coax resistance is similar to earlier plasma discharges today. Next shot: repeat, no DPCS changes. |
| Nov 10 2005 03:41:35:210PM | 1051110025 | Robert Granetz | Plasma. Good shot. Ohmic H-modes. Several noticeable projectiles on WIDE2 view. Next shot: repeat, no DPCS changes. |
| Nov 10 2005 03:54:06:727PM | 1051110026 | Robert Granetz | Plasma. Good shot. A few ohmic H-modes. Next shot: repeat, no DPCS changes. |
| Nov 10 2005 04:07:23:743PM | 1051110027 | Robert Granetz | Plasma. Good shot. Numerous ohmic H-modes. Next shot: repeat, no DPCS changes. |
| Nov 10 2005 04:23:58:743PM | 1051110028 | Robert Granetz | Plasma. Good shot. Multiple ohmic H-modes. Next shot: try ramping down Ip to see if we can get an steadier ohmic H-mode. |
| Nov 10 2005 04:31:48:867PM | 1051110029 | Robert Granetz | Plasma. Good shot. Both Bt was ramped down to 3.0 T and then Ip was ramped down to 0.4 MA. Got a couple of ELMfree ohmic H-modes, but they didn't last as Ip was dropped. Oh well, it was worth a try. Next shot: repeat, except turn off the Ar/Ne valve. |
| Nov 10 2005 04:44:37:193PM | 1051110030 | Robert Granetz | Plasma. Good shot. I don't think the ohmic H-mode characteristics were noticeably different. Next shot: raise nl_04 to 0.75e20 m-2. |
| Nov 10 2005 05:01:53:337PM | 1051110031 | Robert Granetz | Fizzle. Only the 2nd one of the day. End of run. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 09:08:28:267AM | Plasma | Ok | |
| 2 | 09:33:42:657AM | Plasma | Ok | |
| 3 | 09:50:16:143AM | Plasma | Ok | |
| 4 | 10:05:45:550AM | Plasma | Ok | |
| 5 | 10:40:38:457AM | Plasma | Ok | |
| 6 | 10:53:33:453AM | Plasma | Ok | |
| 7 | 11:06:31:800AM | Plasma | Ok | |
| 8 | 11:23:07:100AM | Plasma | Ok | |
| 9 | 11:38:13:680AM | Plasma | Ok | |
| 10 | 11:51:19:867AM | Plasma | Ok | |
| 11 | 12:05:17:040PM | Plasma | Ok | |
| 12 | 12:18:26:523PM | Plasma | Ok | |
| 13 | 12:32:07:023PM | Plasma | Ok | |
| 14 | 12:45:14:430PM | Plasma | Ok | |
| 15 | 12:58:16:350PM | Plasma | Ok | |
| 16 | 01:11:30:680PM | Plasma | Ok | |
| 17 | 01:24:43:507PM | Plasma | Ok | |
| 18 | 01:37:58:540PM | Plasma | Ok | |
| 19 | 01:51:38:617PM | Plasma | Ok | |
| 20 | 02:05:42:540PM | Plasma | Ok | |
| 21 | 02:19:53:133PM | Plasma | Ok | |
| 22 | 02:33:30:447PM | Plasma | Ok | |
| 23 | 03:04:02:710PM | Test | Ok | OHs and TF Shot |
| 24 | 03:17:27:913PM | Plasma | Ok | |
| 25 | 03:30:40:117PM | Plasma | Ok | |
| 26 | 03:43:54:853PM | Plasma | Ok | |
| 27 | 03:57:17:523PM | Plasma | Ok | |
| 28 | 04:10:48:650PM | Plasma | Ok | |
| 29 | 04:25:35:930PM | Plasma | Ok | |
| 30 | 04:38:44:820PM | Plasma | Ok | |
| 31 | 04:52:04:570PM | Plasma | Ok | |