Alcator C-Mod Run 1040213 Information

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Miniproposals
Miniproposal:384
Date Filed: 2/2/2004
Title:Experiments on Plasma Flows and the L-H Threshold: low density discharges, limited versus diverted t
First Author:Brian Labombard
Session Leader:Brian Labombard (shots 1-28)

Operators
Session leader(s):Brian Labombard
Physics operator(s):Steve Wolfe
Engineering operator(s): Unknown

Engineering Operator Run Comment
MP#384 Experiments on Plasma Flows and the L-H Threshold

Session Leader Plans

Physics Operators Plans

Session Leader Summaries
Entered: Jul 7 2004 03:49:02:790PM
Author: Brian Labombard
Run Summary for 1040213

MP#384 - Experiments on Plasma Flows and the L-H Threshold:
low density discharges, limited versus diverted topologies
and the role of neutrals

Physics Operator: S. Wolfe
Session Leader: B. LaBombard
______________________________________________________________________________
Purpose:

The purpose is to explore relationships between edge plasma flows, magnetic
topologies, and the L-H power threshold. In particular, these experiments will focus
on three topics which may help identify controlling physics: (1) influence of
magnetic topology (upper- versus lower-null) in low density discharges, (2) limited
versus diverted topologies, and (3) neutral charge-exchange collisions as a mechanism
for flow momentum transfer between the scrape-off layer and the confined plasma.

Shot Plan:

All shots are 0.8MA, 5.7 tesla discharges.
(Note: we want 5.7 tesla to place FRCECE channels near edge.)

A. L-H thresholds in LSN/USN with NL04 = 0.6x1020 m-2
Load from shot#1031118018: LSN with NL04 = 0.7x1020 m-2
Set density program to NL04 = 0.6x1020 m-2
Set TF programming to 5.7 tesla.
Notes on shot#1031118018:
Segment 2 - single null lower
Segment 3 - single null upper
Segment 4 - double null
Set probe scan times to 0.7 and 0.9 seconds.
Program RF power ramp of 2 to 4 MW over time interval 0.95 to 1.5 sec.

Shot#1-3: Optimize probe insertions. Determine L-H threshold power for LSN

Load segment#3 from shot#1031118007: USN with NL04 = 0.65x1020 m-2
Set density program to NL04 = 0.6x1020 m-2
Set TF programming to 5.7 tesla.

Shot#4-6: Optimize probe insertions. Determine L-H threshold power for USN

Is the difference in USM/LSN power thresholds at this density significantly
less than 2 MW (the difference value seen at NL04 = 0.9x1020 m-2)?

B. Effect of inner wall gas puff on SOL/core momentum coupling
Go back to LSN discharge (by turning on segment 2)
Program for no RF power
Fill NINJA plenum to 40 PSI deuterium
Trigger capillary B16-001 to puff at 0.9 s for duration of 0.2 s
Set probe scan times to 0.7, 0.9, and 1.1 seconds

Shot#7-9: Vary gas-puff timing relative to probe scan time

Change capillary to A/B Limiter, puffing at 0.9 s for duration of 0.2 s

Shot#10-12: Vary gas-puff timing relative to probe scan time

Compare flows near separatrix in Shot#7-9 with these baseline shots

C. Effect of inner divertor nose recycling on SOL/core momentum coupling
Refill NINJA plenum with helium (for CHROMEX)
Set probe scan times to 0.7 and 0.9 seconds.
Program RF power ramp of 2 to 4 MW over time interval 0.95 to 1.5 sec.
Program lower x-point position to place LCFS close to but not touching
inner divertor nose

Shot#13-15: Vary distance between LCFS and inner divertor nose
Look for differences in core rotation and L-H threshold power,
compared to shots#1-3 above

D. L-H Thresholds in Lower Limited versus Lower Diverted Discharges
Reload a LSN shot from part B above
Change density programming to NL04 = 0.9x1020 m-2
Program RF power ramp of 0 to 2 MW over time interval 0.95 to 1.5 sec.

Shot#16-19: Determine L-H threshold power for LSN at this density

Program lower x-point position to limit discharge on inner divertor nose

Shot#20-25: Vary x-point location. Measure flows, determine L-H threshold powers.
______________________________________________________________________________
Result:
It was a rough day at the office with assorted computer delays, a hybrid computer panic, and a
liberal sprinkling of duds. But we did manage to force our way through a good chunk of the
experimental plan. We also learned a few things.

Part A
At a density around NL04=0.6e20 the LSN L-H transition occurred at an RF power of about
1.1 MW (shots 4,5). This value is similar to that found earlier for NL04 near 0.9e20. Earlier
experiments also noted that at the lower densities (NL04=0.6e20) the toroidal plasma rotation in the
core (HIREX) and low field-side SOL plasma rotation near the separatrix (ASP, FSP) show only a
weak dependence on USN/LSN topology. So the question to address today was: "Is the difference
in USN/LSN power thresholds at this density correspondingly less than 2 MW (the difference
value seen at NL04 = 0.9e20 m-2)?" The USN shots 6, 8, and 9 were our best attempts at
addressing this question. Unfortunately, outgassing during RF (plus perhaps NINJA He puff)
resulted in the plasma density rising above the target value (0.68e20 and 0.79e20 on shots 8 and 9)
and clouded the result. Nevertheless, no L-H transition was seen for RF powers up to 2.2MW (shot
8) and 3 MW (shot 9). So it appears that the answer is a qualified NO - the L-H threshold power
difference between USN/LSN is not significantly reduced in the lower density discharges. If there
does exist a reduced difference in USN/LSN threshold powers at NL04=0.6e20, it is subtle and
would require some careful tweaking of the target density and getting some cleaner high RF power
ramps. It should be noted that the SOL flows on the high field (ISP) still show a dramatic
dependence on USN/LSN topology (counter/co-current) at the lower density. So, were we just thinking
about this wrong? Is it the ever-present high field SOL flows that matter most with regard to the
affecting the USN/LSN threshold powers? - and the coupling of this flow momentum to the
confined plasma merely a secondary effect?

Part B
LSN shots 15-19 were strong NINJA D2 gas puffs from the inner wall (15,16,18) and outer A-B
limiter (17,19). The idea was to look for systematic differences in the toroidal plasma rotation at the
separatrix (ASP,FSP) and in the core (HIREX) in response to the gas puff. The puff time was
varied relative to probe scan times, in the hopes of catching a transient toroidal spin-up (or down).
No dramatic changes in HIREX rotation or raw probe data traces were immediately evident -
although it is difficult to subtract by eye the effect of the NINJA-induced density rise on the
HIREX rotation changes. A more detailed analysis, particularly of the probe data, will need to be
performed. Yet it appears that only subtle effects (if any) will come out of it.

Part C
Shots 21,22,24,25,27,28 were dedicated to looking at the effect of varying the gap between the
inner divertor nose and separatrix on the L-H power threshold and plasma rotation. Shots
21,22,24,27 had small gap while shots 3,4,5,25,28 had normal gap. Ideally, we wanted to compare
identical LSN discharges except with the gaps small/large. But, once again, we were plagued with
varying target plasma densities which (we suspect) introduced variability in the L-H power
thresholds. For NL04 around 0.5e20, it appears that we were flirting with the so-called "low
density limit" to L-H access (another mystery in itself to be solved). Yet, the data does suggest that
for small inner divertor nose gaps, the L-H power threshold may be lower. Consider the shots:

Normal Gap
Shot NL04 (1e20m^-2) Prf-threshold (MW)
3 0.71 1.2
4 0.6 1.1
5 0.58 1.1
25 0.5 no H-mode for Prf up to 1.4
28 0.59 no H-mode for Prf up to 1.5

Reduced Gap
21 0.9 0.85
22 0.63 0.75
24 0.58 0.76
27 0.5 no H-mode for Prf up to 1.2

Based on shots 5 and 24, the L-H threshold power appears to be reduced. But in light of the
variability, these discharges need to be revisited. A comparison of corresponding toroidal
flow data (HIREX and probes) should be interesting.

Part D
We did not get to Part D. This will have to wait for another run, but not on Friday the 13th
please!

Important Other Result
It should be noted that in USN shot 11, the density feedback died and we got a very low density
shot (NL04 =0.2e20 prior to RF). In response, HIREX recorded a very strong CO-current rotation
in the ohmic phase!!. The ASP and FSP probes also recorded a very bizarre POSITIVE
floating potential near the separatrix of over 100 volts! This implies a very strong POSITIVE Er
near the separatrix which is consistent with the co-current HIREX rotation. (We also have probe
flow data, but haven't looked at it yet.) No H-mode was seen for Prf up to 3.9 MW!!! So clearly
something important is going on in these low density discharges which needs to be explored - a
mini-proposal dedicated to poking at this low density regime is obviously in our future.
______________________________________________________________________________

Detailed Shot log:

1 - Hybrid problem? - long delay
2 - SNL, no probes scanning
3 - SNL, NL04 =0.6 to 0.71 - ASP(+9), FSP(-4), ISP
=> H-mode at RF turn-on 1.2 MW (NL04=0.71)
4 - SNL, NL04 =0.54 to 0.6 and rising during RF. - ASP(+9), FSP(-4), ISP
=> H-mode at Prf = 1.1 MW
5 - SNL, NL04 =0.52 to 0.58 and rising during RF. - ASP(+11, too deep on first scan), FSP(-3, ok), ISP
=> H-mode at Prf = 1.1 MW
6 - SNU, NL04 =0.53 to 0.58 and rising during RF. ASP(+8.5), FSP(+8.5), ISP
=> No H-mode at 1.5 PRF. Also core rotation does not change with RF power at this level
7 - early disruption
8 - SNU, NL04 =0.55 and jumps up during RF (0.68 and rising). ASP(+8.5), FSP(+8.5), ISP
=> No H-mode at 2.2 PRF. Core rotation is now responding To RF power.
9 - SNU, NL04 =0.61 and jumps up during RF (0.79) ASP(+8.2), FSP(+8.5), ISP - nice data
= No H-mode at 3 MW PRF.
...long delay - computer problems
10- Early disruption. DAC mixes up shot 9 and 10 traces and labels them as shot 10!
11- SNU, NL04 =0.2 prior to RF! (0.4 during RF) lost gas feedback. ASP(+8.2), FSP(+8.5), ISP - nice data
=> No H-mode at 3.9 MW PRF
=> ASP and FSP see POSITIVE 100 volts floating potential! John also sees rotation go co-current
as density drops.
12- SNU, NL04 ramping! probe scans at NL04=1.0 and 1.2. lost gas feedback. 1.0 MW PRF. ASP(+8.2), FSP(+8.5), ISP - nice data
13- early disruption
14- dud
15- SNL, NL04=0.56 jumps to 1.10 NINJA: D2 0.72 trig, 0.15 duration, B16-001 ASP(+10), FSP(-3), ISP
16- SNL, NL04=0.68 jumps to 1.13 NINJA: D2 0.805 trig, 0.15 duration, B16-001 ASP(+10), FSP(-3), ISP
17- SNL, NL04=0.75 jumps to 1.13 NINJA: D2 0.805 trig, 0.15 duration, AB-Lim ASP(+10), FSP(-3), ISP
18- SNL, NL04=0.66 jumps to 1.13 NINJA: D2 0.78 trig, 0.15 duration, B16-001 ASP(+10), FSP(-3), ISP
19- SNL, NL04=0.67 jumps to 1.12 NINJA: D2 0.78 trig, 0.15 duration, AB-Lim ASP(+10), FSP(-3), ISP
20 - fizzle
21- SNL, small inner divertor nose gap. NL04=0.73 ramping to 1.0 ASP(+10), FSP(-3, far out), ISP
=> dithering H-alpha at 0.85 MW Prf level (NL04=0.9)
22- SNL, small inner divertor nose gap. NL04=0.63 and flat ASP(+10), FSP(+6, 2 mm out), ISP
=> H-mode at Prf = 0.70 MW
23- dud
24- SNL, small inner divertor nose gap. NL04=0.58 and flat ASP(+10), FSP(+8), ISP
=> H-mode at Prf = 0.76 MW
25- SNL, normal inner divertor nose gap. NL04=0.5 and flat ASP(+10), FSP(-3), ISP
=> no H-mode for Prf up to 1.4 MW
26 -dud
27- SNL, small inner divertor nose gap. NL04=0.5 and flat ASP(+10), FSP(+8), ISP
=> no H-mode for Prf up to 1.2 MW
28- SNL, normal inner divertor nose gap. NL04=0.59 and flat ASP(+10), FSP(-3), ISP
=> no H-mode for Prf up to 1.5 MW

Physics Operator Summaries
Entered: Jul 7 2004 04:36:48:990PM
Author: Steve Wolfe
Physics Summary for Friday 13-Feb-2004

MP#384 Experiments on Plasma Flows and the L-H Threshold
Piggyback MP#389 CNPA - V. Tang
SL: LaBombard
PO: wolfe
EO: Cochran,Byford,Parkin (the Bills)

Engineering Setup
-----------------
ECDC Overnight in D2, stopping by 07:00
Run Begins at 09:00 and ends at 17:00

Power Systems as on 1031118018, except TF current limit to 170kA

Gas System 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 C-side with 30 psi D2 Hybrid enabled (PG3)
fill NINJA (lower cap) with 6psi He

Gate valve permissives for the usual suspectsd (ECE,VUV,DNB) assuming no
vacuum problems


RF: Transmitters #1,2,3 and 4 in RUN-ON by 08:00
RF program ramp from 2MW to 4MW over interval 0.95 to 1.5sec; loading
similar to 1031118007.

Run Plan
---------

Purpose:

The purpose is to explore relationships between edge plasma flows, magnetic
topologies, and the L-H power threshold. In particular, these experiments will focus
on three topics which may help identify controlling physics: (1) influence of
magnetic topology (upper- versus lower-null) in low density discharges, (2) limited
versus diverted topologies, and (3) neutral charge-exchange collisions as a mechanism
for flow momentum transfer between the scrape-off layer and the confined plasma.


Shot Plan:

All shots are 0.8MA, 5.7 tesla discharges.
(Note: we want 5.7 tesla to place FRCECE channels near edge.)

A. L-H thresholds in LSN/USN with NL04 = 0.6x1020 m-2
Load from shot#1031118018: LSN with NL04 = 0.7x1020 m-2
Set density program to NL04 = 0.6x1020 m-2
Set TF programming to 5.7 tesla.
Notes on shot#1031118018:
Segment 2 - single null lower
Segment 3 - single null upper
Segment 4 - double null
Set probe scan times to 0.7 and 0.9 seconds.
Program RF power ramp of 2 to 4 MW over time interval 0.95 to 1.5 sec.

Shot#1-3: Optimize probe insertions. Determine L-H threshold power for LSN

Load segment#3 from shot#1031118007: USN with NL04 = 0.65x1020 m-2
Set density program to NL04 = 0.6x1020 m-2
Set TF programming to 5.7 tesla.

Shot#4-6: Optimize probe insertions. Determine L-H threshold power for USN

Is the difference in USM/LSN power thresholds at this density significantly
less than 2 MW (the difference value seen at NL04 = 0.9x1020 m-2)?

B. Effect of inner wall gas puff on SOL/core momentum coupling
Go back to LSN discharge (by turning on segment 2)
Program for no RF power
Fill NINJA plenum to 40 PSI deuterium
Trigger capillary B16-001 to puff at 0.9 s for duration of 0.2 s
Set probe scan times to 0.7, 0.9, and 1.1 seconds

Shot#7-9: Vary gas-puff timing relative to probe scan time

Change capillary to A/B Limiter, puffing at 0.9 s for duration of 0.2 s

Shot#10-12: Vary gas-puff timing relative to probe scan time

Compare flows near separatrix in Shot#7-9 with these baseline shots

C. Effect of inner divertor nose recycling on SOL/core momentum coupling
Refill NINJA plenum with helium (for CHROMEX)
Set probe scan times to 0.7 and 0.9 seconds.
Program RF power ramp of 2 to 4 MW over time interval 0.95 to 1.5 sec.
Program lower x-point position to place LCFS close to but not touching
inner divertor nose

Shot#13-15: Vary distance between LCFS and inner divertor nose
Look for differences in core rotation and L-H threshold power,
compared to shots#1-3 above

D. L-H Thresholds in Lower Limited versus Lower Diverted Discharges
Reload a LSN shot from part B above
Change density programming to NL04 = 0.9x1020 m-2
Program RF power ramp of 0 to 2 MW over time interval 0.95 to 1.5 sec.

Shot#16-19: Determine L-H threshold power for LSN at this density

Program lower x-point position to limit discharge on inner divertor nose

Shot#20-25: Vary x-point location. Measure flows, determine L-H threshold powers.



Results:
----------

A difficult day; Friday the 13th definitely came on a Friday this month. We
got through parts A and B of the plan; we also had a number of shots on part
C, but without conclusive results. See the Session Leader's report for an
evaluation. Vincent got signals from the CNPA when the beam and RF were both
on before the L-H transition. Problems included numerous computer hangs and
crashes, a mystery hybrid malfunction, tci feedback failures, extra density
from NINJA puffs and RF, and duds and fizzles later in the day. There were
also problems with J-port later in the day, which didn't really impact the run
because that part was done with lower power requested.

On the first shot, the hybrid seemed to have a problem which caused the ZCUR
precictor to think the plasma was very high, which caused it to throw the
plasma away early in segment 1. The outputs looked like there was a bad DAC
card, with seriously wrong AOUT values on wire 2&3 (ZCUR), and possibly less
wrong values on 1 and 4 during the pre-charge. All the inputs looked good, on
the magnetics, hybrid camac and lowbrid. DPCS AOUT's looked normal, indicating
a hybrid malfunction. After a couple of reload/coldstarts, a trip to the
interface room to reseat the input connectors, a lot of head scratching and a
couple of computer crashes, we took shot #2 around 10:30, and it was
fine. Best guess is that somehow bad gains got loaded into the hybrid,
although the initial load and coldstart looked normal. I've never seen this
behavior before (and hope I never do again). The dpcs signals were useful in
identifying this as a problem internal to the hybrid, although it still is not
clear what the problem was.

Alcserv4 (alcdaq) hung and/or crashed several times today. The last time Josh
reseated the memory cards before rebooting. We also had a crash of daqa that
may have been network-related. Note that after one alcserv4 hang, during INIT
on shot#10, we ended up with some data from shot 9 stored as if from shot
10. The magnetics signals, including current, in the shot 10 tree are actually
from shot 9. The actual shot 10 was a 0.5sec long disruptive discharge.

As happened yesterday, there were a couple of duds and some slightly late
breakdowns. I ended up with Br0=0 and IC_EF4=-1345, and pg4 at 20msec. The
10A more negative on EF4 may have helped, but there weren't enough shots to
really tell.

There were a number of disruptions that seemed to be related to random
injections. Also, when we went to the part C discharges, with recycling off
the nose, the outer strike point got onto or close to the EF1 pocket, and I
think that was the cause of the disruptions on 21 and 27.

Scorecard
---------

Tests 0
Duds 3
Fizzles 1
<100msec 1 Hybrid error
plasmas 23 (Includes 3 disruptions before 0.6sec)
------ --
shots 28

Session Leader Comments
Feb 13 2004 08:55:32:563AMBrian LabombardMP#384 - Experiments on Plasma Flows and the L-H Threshold:
low density discharges, limited versus diverted topologies
and the role of neutrals

Purpose:

The purpose is to explore relationships between edge plasma flows, magnetic
topologies, and the L-H power threshold. In particular, these experiments will focus
on three topics which may help identify controlling physics: (1) influence of
magnetic topology (upper- versus lower-null) in low density discharges, (2) limited
versus diverted topologies, and (3) neutral charge-exchange collisions as a mechanism
for flow momentum transfer between the scrape-off layer and the confined plasma.


Shot Plan:

All shots are 0.8MA, 5.7 tesla discharges.
(Note: we want 5.7 tesla to place FRCECE channels near edge.)

A. L-H thresholds in LSN/USN with NL04 = 0.6x1020 m-2
Load from shot#1031118018: LSN with NL04 = 0.7x1020 m-2
Set density program to NL04 = 0.6x1020 m-2
Set TF programming to 5.7 tesla.
Notes on shot#1031118018:
Segment 2 - single null lower
Segment 3 - single null upper
Segment 4 - double null
Set probe scan times to 0.7 and 0.9 seconds.
Program RF power ramp of 2 to 4 MW over time interval 0.95 to 1.5 sec.

Shot#1-3: Optimize probe insertions. Determine L-H threshold power for LSN

Load segment#3 from shot#1031118007: USN with NL04 = 0.65x1020 m-2
Set density program to NL04 = 0.6x1020 m-2
Set TF programming to 5.7 tesla.

Shot#4-6: Optimize probe insertions. Determine L-H threshold power for USN

Is the difference in USM/LSN power thresholds at this density significantly
less than 2 MW (the difference value seen at NL04 = 0.9x1020 m-2)?

B. Effect of inner wall gas puff on SOL/core momentum coupling
Go back to LSN discharge (by turning on segment 2)
Program for no RF power
Fill NINJA plenum to 40 PSI deuterium
Trigger capillary B16-001 to puff at 0.9 s for duration of 0.2 s
Set probe scan times to 0.7, 0.9, and 1.1 seconds

Shot#7-9: Vary gas-puff timing relative to probe scan time

Change capillary to A/B Limiter, puffing at 0.9 s for duration of 0.2 s

Shot#10-12: Vary gas-puff timing relative to probe scan time

Compare flows near separatrix in Shot#7-9 with these baseline shots

C. Effect of inner divertor nose recycling on SOL/core momentum coupling
Refill NINJA plenum with helium (for CHROMEX)
Set probe scan times to 0.7 and 0.9 seconds.
Program RF power ramp of 2 to 4 MW over time interval 0.95 to 1.5 sec.
Program lower x-point position to place LCFS close to but not touching
inner divertor nose

Shot#13-15: Vary distance between LCFS and inner divertor nose
Look for differences in core rotation and L-H threshold power,
compared to shots#1-3 above

D. L-H Thresholds in Lower Limited versus Lower Diverted Discharges
Reload a LSN shot from part B above
Change density programming to NL04 = 0.9x1020 m-2
Program RF power ramp of 0 to 2 MW over time interval 0.95 to 1.5 sec.

Shot#16-19: Determine L-H threshold power for LSN at this density

Program lower x-point position to limit discharge on inner divertor nose

Shot#20-25: Vary x-point location. Measure flows, determine L-H threshold powers.
Feb 13 2004 10:45:11:723AM1040213002Brian LabombardShot 2- probes not scanning
NL04 0.7

Next shot: lower density, scan probes
Feb 13 2004 11:03:45:967AM1040213003Brian LabombardShot 3 - ASP, FSP, ISP scanning at 0.7, 0.9 seconds
NL04 at 0.6 H-mode at 0.95 seconds at RF turn on

Feb 13 2004 11:17:35:853AM1040213004Brian LabombardShot 4 - ASP, FSP, ISP scanning at 0.7, 0.9 seconds
NL04 at 0.55 and rising. H-mode at 1.1 MW RF
ISP - ok
ASP - could be deeper
FSP - could be deeper
Feb 13 2004 11:28:35:490AM1040213005Brian LabombardShot 5 - ASP, FSP, ISP scanning at 0.7, 0.9 seconds
NL04 at 0.55 and rising. again H-mode at 1.1 MW RF
ISP - ok
ASP - too deep on first scan
FSP - good
Feb 13 2004 11:50:55:467AM1040213006Brian LabombardShot 6 - USN
ASP, FSP, ISP scanning at 0.7, 0.9 seconds
NL04 at 0.55 and rising. No H-mode with 1.5 MW RF
Toroidal rotation did not change at all with RF power at this level
ISP - ok
ASP - ok
FSP - ok
Feb 13 2004 12:58:53:517PM1040213009Brian LabombardShot 9 - USN
ASP, FSP, ISP scanning at 0.7, 0.9 seconds
NL04 at 0.55 and rising. No H-mode with 3.0 MW RF
ISP - ok
ASP - ok
FSP - ok
Feb 13 2004 01:32:05:300PM1040213011Brian LabombardShot 11 - USN
ASP, FSP, ISP scanning at 0.7, 0.9 seconds
NL04 at 0.3! No H-mode with 3.9 MW RF
ISP - ok
ASP - ok
FSP - ok
ASP and FSP see POSITIVE 100 volts floating potential on 0.9 s scan!!
Feb 13 2004 01:43:20:250PM1040213012Brian LabombardShot 12 - USN
ASP, FSP, ISP scanning at 0.7, 0.9 seconds
NL04 ramp! 1 MW RF
ISP - ok
ASP - ok
FSP - ok
Feb 13 2004 02:18:42:330PM1040213015Brian LabombardShot 15 - LSN, NINJA: D2 (1800 torr) 0.72 trig, 0.15 duration, B16-001
ASP, FSP, ISP scanning at 0.7, 0.9, 1.1 seconds
NL04 0.52, ramping up starting at 0.81 sec
ISP - ok
ASP - ok
FSP - ok

Next Shot: repeat, delay NINJA trigger to 0.805 sec
Feb 13 2004 02:30:51:137PM1040213016Brian LabombardShot 16 - LSN, NINJA: D2 (1800 torr) 0.805 trig, 0.15 duration, AB Lim
ASP, FSP, ISP scanning at 0.7, 0.9, 1.1 seconds
NL04 0.52, ramping up starting at 0.89 sec
ISP - ok
ASP - ok
FSP - ok

Next Shot: repeat, puff from outer limiter
Feb 13 2004 02:43:57:273PM1040213017Brian LabombardShot 17 - LSN, NINJA: D2 (1800 torr) 0.805 trig, 0.15 duration, AB Lim
ASP, FSP, ISP scanning at 0.7, 0.9, 1.1 seconds
NL04 0.71, ramping up starting at 0.91 sec
ISP - ok
ASP - ok
FSP - ok

Next Shot: repeat, puff from inner limiter, earlier by 0.025 s
Feb 13 2004 02:54:47:880PM1040213018Brian LabombardShot 18 - LSN, NINJA: D2 (1800 torr) 0.78 trig, 0.15 duration, B16-001
ASP, FSP, ISP scanning at 0.7, 0.9, 1.1 seconds
NL04 0.68, ramping up starting at .87
ISP - ok
ASP - ok
FSP - ok

Next Shot: repeat, puff from outer limiter
Feb 13 2004 03:13:33:027PM1040213019Brian LabombardShot 19 - LSN, NINJA: D2 (1800 torr) 0.78 trig, 0.15 duration, AB Lim
ASP, FSP, ISP scanning at 0.7, 0.9, 1.1 seconds
NL04 0.68, ramping up starting at .87
ISP - ok
ASP - ok
FSP - ok

Next Shot: Go to small inner divertor nose gap
Feb 13 2004 04:09:31:880PM1040213021Brian LabombardShot 21 - LSN, small innder divertor nose gap
ASP, FSP, ISP scanning at 0.7, 0.9 seconds
NL04 0.7 and rising
ISP - ok
ASP - ok
FSP - ok, 7 mm out
Feb 13 2004 04:08:40:880PM1040213022Brian LabombardShot 22 - LSN, small inner divertor nose gap
ASP, FSP, ISP scanning at 0.7, 0.9 seconds
NL04 0.6 flat target. H-mode at 0.8 MW PRF
ISP - ok
ASP - ok
FSP - ok, 2 mm out
Feb 13 2004 04:29:37:560PM1040213024Brian LabombardShot 24 - LSN, small inner divertor nose gap
ASP, FSP, ISP scanning at 0.7, 0.9, 1.1 seconds
NL04 0.55 flat target. H-mode at 0.75 MW PRF
ISP - ok
ASP - ok
FSP - ok

Next Shot: go back to normal gap (shot 19)
Feb 13 2004 04:37:08:340PM1040213025Brian LabombardShot 25 - LSN - normal inner divertor nose gap
ASP, FSP, ISP scanning at 0.7, 0.9, 1.1 seconds
NL04 0.5 flat target. no H-mode up to 1.4 MW
ISP - ok
ASP - ok
FSP - ok

Next Shot: redo shot 24
Feb 13 2004 05:14:46:110PM1040213027Brian LabombardShot 27 - LSN, small inner divertor nose gap
ASP, FSP, ISP scanning at 0.7, 0.9, 1.1 seconds
NL04 0.49 flat target. no H-mode up to 1.2 MW
ISP - ok
ASP - ok
FSP - ok
Feb 13 2004 05:26:18:320PM1040213028Brian LabombardShot 28 - LSN, normal inner divertor nose gap
ASP, FSP, ISP scanning at 0.7, 0.9, 1.1 seconds
NL04 0.59 flat target. no H-mode up to 1.4 MW
ISP - ok
ASP - ok
FSP - ok

Physics Operator Comments
Feb 12 2004 05:18:55:303PMSteve WolfeSetting up PCS for run 1040213

load from 1031118018
load seg3 from 1031118007
load seg1 from 1040210030

In seg2 change tf from -150000 to -158000
copy to seg3

in seg2 change nl04 to 0.6e20
copy to seg3

build everything and touch up the stale wires.
save as /home/wolfe/pcs_trees/pcs_1040213999
Feb 13 2004 07:07:46:267AMSteve WolfeLoad previously prepared shot from /home/wolfe/pcs_trees/pcs_1040213999
into model:
Filling in configuration /12-NOV-2003 08:00:23.00/
Cleaning PCS tree in /home/wolfe/pcs_scratch
about to ask alcdata to copy /home/wolfe/pcs_scratch/pcs_model to /cmod/trees/models/pcs/pcs_model
Load at 13-Feb-2004 07:07:02.00
Open tree /home/wolfe/pcs_scratch -1
Open tree done
Feb 13 2004 07:45:44:990AMSteve WolfeThere was a brief computer hang at about 07:44. All stations
seemed to freeze for a minute, then woke up again.
Feb 13 2004 07:52:34:980AMSteve WolfeThe logbook froze when I made the previous entry.
Killed it and brought up a new one, which took a long
time to appear

See if it will accept this entry
Feb 13 2004 09:32:37:360AM1040213001Steve WolfeShot#1: Supposed to be SNL like 1031118018 except Bt=5.7,nl05=.60e20
fizzle? No it got 130kA then died vertically
Looks like the chopper did something strange.

There's a big offset on the zcur predictor, normally around -5000 at t=0,
on shot 1 it is +5000
Feb 13 2004 09:52:57:933AM1040213001Steve WolfeShot#1: The lowbrid and hybrid disagree on the zcur value
Looks like the hybrid is doing something strange.
The zcur aoutputs seem to be wrong through the whole
pre-charge, as if one input or more inputs are missing, or
the coefficients are wrong. The zcur signals go to 1V at -.55sec
Both of them do it, which could mean a missing input or
a bad DAC in the A-matrix somewhere.

Feb 13 2004 10:13:58:347AM1040213001Steve WolfeShot#1:Went in the hybrid room and made sure all the
input cables are ok. It can't be that because I see all
the camac signals, and they are bridge through the hybrid
front panel, not teed.

It may be a DAC or a bad gain. Hard to believe it's a gain
since it's on two wires.

Reload and do a new coldstart anyway.
Tried to do a coldstart and it gave server connect errors!

Tom restarted servers on daqa and did a coldstart. He
says there were no errors.
Feb 13 2004 10:28:19:760AM1040213001Steve WolfeDAQA crashed. I'll do a new coldstart when it comes back up.

rtnode -- data loaded, A matrix responds
rtnode -- data loaded, M matrix responds
rtnode -- data loaded, PID matrix responds
RT_NODE Done
Fri Feb 13 09:28:03 2004, Done \CMOD::TOP.HYBRID.HARDWARE.BITBUS:RT_NODE:EXEC_ACTION in CMOD shot -1, status=1
Feb 13 2004 10:36:23:680AM1040213002Steve Wolfeshot#2: Plasma. I have no idea what screwed up on first shot,
but it's fixed now.

nl4 is a little high.
next shot: drop nl4 program to 5e19
Feb 13 2004 10:51:10:283AM1040213003Steve Wolfeshot#3: drop nl4 program to 5e19, and decrease pg3 seg2 maint level to 10V
plasma, nl still a little high - NINJA is fueling some
H-mode at 1.02sec, Prf~1.3MW

next shot: turn seg2 pg3 off after .145sec
Feb 13 2004 11:08:53:420AM1040213004Steve Wolfeshot#4: lower rf, drop pg3 V puff,
plasma,hmode at 1.2sec
density is coming up during the RF

next shot: repeat for deep probe
Feb 13 2004 11:24:21:773AM1040213005Steve Wolfeshot#5: repeat for deep probe
plasma.

next shot: upper null
Feb 13 2004 11:44:38:437AM1040213006Steve Wolfeshot#6: go to upper null, seg2 off seg 3 on (after copying nl4 and gas )
plasma no h-mode, upper null. RF was still at lower power

next shot: repeat
Feb 13 2004 12:31:20:123PM1040213007Steve Wolfeshot#7:repeat with higher power
disrupts at .39sec
injection at .1, big injection near top of inner cyl
before disruption. It's in crossover and just gointg diverted
at that time

next shot: increase current rise after .1sec,
slow down clearin before .4, no change after .55

Feb 13 2004 12:31:37:153PM1040213008Steve Wolfeshot#8: increase current rise after .1sec,
slow down clearin before .4, no change after .55
plasma, no hmode. J faulting, only got 2MW
got rid of the injections, for this shot anyway.

next shot: repeat for RF
Feb 13 2004 12:49:55:537PM1040213009Steve Wolfeshot#9: repeat for RF
plasma disrupts at 1.23, during the RF?
Computer problem on rf traces.
Scopes are blowing away, data not showing up.

Alcdaq has been rebooted. Some data on 9 is lost.


Feb 13 2004 01:06:02:390PM1040213010Steve Wolfeshot#10: repeat for RF
NINJA is ready for part B (40psi D2), but will not pulse this shot.
Hung up in init.
Jas freed it up.

Ugly early disruption at 0.5sec,
Some traces are the same as shot9
Lots of runaways
Current shot is still 9 according to the logbook
and the big board

Feb 13 2004 01:09:16:357PM1040213010Steve Wolfeshot#10: repeat for RF
NINJA is ready for part B (40psi D2), but will not pulse this shot.
Hung up in init.
Jas freed it up.

Ugly early disruption at 0.5sec,
Some traces are the same as shot9
Lots of runaways
Current shot is still 9 according to the logbook
and the big board

next shot: Get rid of zcur mismatch at 0.1sec
Feb 13 2004 02:08:53:163PM1040213011Steve Wolfeshot#11: repeat for RF
Get rid of zcur mismatch at 0.1sec

plasma disrupted at 1.4sec, still no h-mode.
looks like a locked mode at 1.03sec. Density is lower
because the NINJA was off.

next shot: turn up the density and increase the Acoil current
Feb 13 2004 02:09:27:100PM1040213012Steve Wolfeshot#12: turn up the density to 6e19,and increase the Acoil current to 3500 (demand)
set pg3 in seg3 to zero for whole time, no drop to negative.
plasma to 1.7sec but this time tci feedback turned the valve on;
last time it turned it off.

next shot: go on to case B (LSN) no RF
Feb 13 2004 02:09:07:380PM1040213013Steve Wolfeshot#13: go on to case B (LSN) no RF
Seg3 off seg 2 on.
disrupted at .36
Spark shower from (outer?) divertor

next shot: repeat
Feb 13 2004 02:08:19:850PM1040213014Steve Wolfeshot#14: go on to case B (LSN) no RF
dud!

next shot: raise the pre-puff
Feb 13 2004 02:12:00:897PM1040213015Steve Wolfeshot#15: pg4 from 15 to 17msec

plasma (finally!)
NINJA hits at .8sec, raises nl4 from .55 to 1.05e20


next shot: repeat with different NINJA timing
Feb 13 2004 02:24:39:313PM1040213016Steve Wolfeshot#16: repeat with different NINJA timing

plasma NINJA comes in about 0.9sec

next shot: repeat with outer puff
Feb 13 2004 02:40:36:993PM1040213017Steve Wolfeshot#17: repeat with outer puff
plasma - puff hits a little late
Also, density has crept up, although gas is off.

next shot: reduce pg3 in seg1
Feb 13 2004 02:53:53:410PM1040213018Steve Wolfeshot#18: reduce pg3 in seg1
plasma - Puff hits at .86 sec

next shot: back to outer limiter puff
Feb 13 2004 03:05:46:797PM1040213019Steve Wolfeshot#19: back to outer limiter puff
reduce pg4 from 17->16msec

plasma - puff hits around .88sec

next shot: Done with B, on to C
Feb 13 2004 03:19:50:137PM1040213020Steve Wolfeshot#20: Done with B, on to C
decrease rxl by .02m from .6sec to 1.5sec

fizzle
next shot: drop pg4 again
Feb 13 2004 03:39:33:597PM1040213021Steve Wolfeshot#21: drop pg4 from 16->15msec, br0 from .0002 to 0.
plasma disrupts at 1.35sec
density is rising during RF; NINJA was also on (He)

next shot: raise zxl to try to keep outer strike off ef1 pocket
Feb 13 2004 04:00:12:980PM1040213023Steve Wolfeshot#23: tweak current rise in seg2; change RF program
dud

next shot: raise pg4 back to 17msec
Feb 13 2004 04:17:25:613PM1040213024Steve Wolfeshot#24: tweak current rise in seg2; change RF program
raise pg4 back to 17msec

plasma, hmode at 1.138sec

next shot: load rxl,zxl from shot 5
Feb 13 2004 04:29:11:577PM1040213025Steve Wolfeshot#25:load rxl,zxl from shot 5
increase pg4 to 18msec

plasma no hmode. rf is good, nl4 is down a smidge.

next shot:go back to shot#24
Feb 13 2004 04:42:53:180PM1040213026Steve Wolfeshot#26:import seg2 from shot#24 (back to the nose)
dud.

next shot: decrease ic_ef4 by 10A, raise pg4 again.
Feb 13 2004 05:02:24:397PM1040213027Steve Wolfeshot#27:import seg2 from shot#24 (back to the nose)
ic_ef4 to -1345, pg4 to 20msec

plasma disrupts at 1.43sec, no hmode


next shot: raise nl4 to 6e19, rxl,zxl from 25
Feb 13 2004 05:08:53:730PM1040213028Steve Wolfeshot#28: raise nl4 to 6e19, rxl,zxl from 25
plasma no hmode
density right on 6e19 until 1.2sec, then drops.

END OF RUN

Engineering Operator Comments
ShotTimeTypeStatusComment
108:57:53:203AMPlasmaOk
210:29:55:700AMPlasmaOk
310:44:47:380AMPlasmaOk
411:00:14:157AMPlasmaOk
511:15:07:243AMPlasmaOk
611:28:35:647AMPlasmaOk
711:42:41:593AMPlasmaOk
811:57:57:197AMPlasmaOk
912:11:07:347PMPlasmaOk
1101:11:27:887PMPlasmaOk
1201:26:12:727PMPlasmaOk
1301:42:18:453PMPlasmaOk
1401:54:55:027PMPlasmaOk
1502:07:24:350PMPlasmaOk
1602:20:07:127PMPlasmaOk
1702:33:33:013PMPlasmaOk
1802:47:01:180PMPlasmaOk
1903:00:51:907PMPlasmaOk
2003:16:52:480PMPlasmaOk
2103:29:32:083PMPlasmaOk
2203:43:14:360PMPlasmaOk
2303:57:05:590PMPlasmaOk
2404:10:00:490PMPlasmaOk
2504:23:52:017PMPlasmaOk
2604:37:07:950PMPlasmaOk
2704:52:46:043PMPlasmaOk
2805:05:18:087PMPlasmaOk