Alcator C-Mod Run 1060725 Information

Miniproposals

Miniproposal: 444

Date Filed: 11/23/2005

Title: Alfvén cascade studies during current ramp-up with ICRF Heating

First Author: Eric Edlund

Session Leader: Eric Edlund (shots 13-24)

Miniproposal: 460

Date Filed: 7/18/2006

Title: Test of Effect of Fast ions on MSE with perpendicular injection

First Author: Steve Scott

Session Leader: Jin-Seok Ko (shots 1-24)

Operators
Session leader(s):	Jin-Seok Ko,Eric Edlund
Physics operator(s):	Robert Granetz,Bill Rowan
Engineering operator(s):	Ed Fitzgerald,Gary Dekow

Engineering Operator Run Comment
MP460 MP444 PO;Granetz,Rowan Sl;Scott,Jinsok Ko EO;Fitzgerald,Pierson,De

Session Leader Plans

Entered: Jul 24 2006 05:04:21:383PM

Author: Eric Edlund

SL: E. Edlund
PO: B. Rowan

Half-day run, beginning at 13:00

MP #444b
Alfvén cascade studies during the current ramp-up with ICRF Heating

The purpose of these experiments is to expand the database of Alfven cascades, specifically looking at the dependence of the initial frequency on temperature. Excitation of the cascade modes is induced by resonant interaction with the RF generated ion tail. Previous thresholds for activity were about 2.5 MW. It is expected that stong activity will be seen at 3 and 4 MW. A scan of RF power at 1 MW steps will be used to vary the bulk temperature.

Previous experimetns run on July 5, 2006 were rather unsuccessful due to poor machine performance, though one shot in particular (012) showed strong cascade activity at a total power level of only 1.5 MW from D and E. This shot will be used as the target discharge for these studies.

Setup:

RF: all 4 transmitters run-on by 8:00 am
use a waveform starting at 0.09 seconds with a ramp to full power by 0.10 seconds, run until 0.5 seconds. Begin with 0.75 MW D, 0.75MW E, and 0.5MW J.

LH: Klystrons on, set to 90 degree phasing, 500 kW. Begin LH injection at 0.5 seconds, 0.9 second pulse length.

Diagnostics: PCI and magnetics are the principal diagnostics. ECE and Thomson are required for temperature and density profile measurements. Hirex and neutrons are requested to help monitor ion temperatures.

Run Plan:

Use 1060705012 for targer plasma.

Begin at 5.4 T, Ip = 800 kA, nl_04 = 0.5 10^19 in flattop. This will put the 80 MHz resonance on axis and the 70 MHz resonance to the LFS.

Establish Alfven cascade activity and then proceed with power scan from 2MW to 5MW (if possible) in 1MW steps. Shots may be repeated to improve the RF matching, if necessary.

Change to 5.0 T for symmetric resonance heating. Repeat the power scan.

Change to 4.7 T for HFS resonance heating with 80 MHz and on-axis heating with 70 MHz. Repeat the power scan.

Physics Operators Plans

Entered: Jul 24 2006 04:31:33:980PM

Author: Bill Rowan

Engineering setup for Tuesday 25 July 2006

MP#444b: Alfven Cascades during current ramp with ICRF heating

Session leaders: E. Edlund
Physics operator: W. Rowan

Overnight ECDC in deuterium; bake at 60 C.

The run will start at 13:00 and end at 17:00.

Power systems as on 1060705012

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)
leave NINJA as is disabled

Enable the following gate valves and shutters, assuming no vacuum problems:
ECE, VUV, Z-bolo shutters

Torvac setup: Gate valves open

Key diagnostics: PCI (in high-k configuration), Mirnov coils, Thomson, and
ECE. Neutron rate and Hirex are also desirable.

-------------------------------------------------------------------------------
ICRF Setup: all transmitters (70 and 80 MHz) in run-on by noon

Session Leader Summaries

Entered: Jul 25 2006 05:56:07:263PM

Author: Eric Edlund

Run Summary for 1060725, MP 444b

We started with rather good plasmas, low density and stable RF, producing promising cascades, shots 013 through 016. Attempts to couple LH required moving the grill closer, unfortuantely resulting in sparks, perhaps a Langmuir probe. We had trouble recovering from this, injections and disruptions followed. We were able to partly recover by raising the density on shot 022, but had no RF until shot 024, at which point we recovered the cascades, though the density was higher with nl_04 measuring 0.75, preventing any measurement of the base frequencies. The best shotsfor the day were 015 and 016, showing clear cascades, perhaps with a measurement of the base frequency, and sawteeth delayed until about 0.29 seconds.

Entered: Jul 30 2006 01:23:25:653PM

Author: Jin-Seok Ko

Brief summary for MP#460

1. On the previous day, we took several shots to find
optimized beam time, He pressure, and L1 aperture
size for MP#460 run. The result was

Beam time : 1.1 sec
He pressuere : 3 mTorr
L1 aperture size : not determined. negligible improvement
in FWHM up to 60% partial closing.
very different from our expectation.

2. On the run day for MP#460, with the MSE shutter fully
open, for channel 7,

(1) It took 4 shots to find the optimum He pressure.
The value 3 mTorr we found on the previous day was
not appropriate in the He gas with TF/EF fields.
The optimum for the spectrum measurement was
determined to be 1 mTorr.

(2) The overall blue feature : Very small. Less than 10%
the red side rather than about 20% suggested from the
predictions. The small plateau is observed at the
beginning of the blue side (the longest wavelength in
the blue side).

(3) The effect of different TF : Agrees with the predictions.
Marginally decreases when Bt goes down 5.4T to 2.0T
maintaining EF configurations

(4) The effect of pitch angle : The structure of the blue
spectrum significantly changed when the EF configuration
was changed maintaining TF=2.0T. Especially, the 'plateau'
was increased. The magnitude didn't change.

(5) So eventually we got 4 different pitch angles for this
channel by 2 different TF x 2 different EF settings

(6) Move on to ch 0 and we had the same pitch angle scan as
for channl 7.

(8) The effect of different channels : There is an effect.

(a) The blue magnitude is smaller than that at ch7.
(b) The blue 'wing' is shorter than that at ch7 as predicted.

3. More quantitative analysis will follow after spectrum analysis
and relevant calculations.

Physics Operator Summaries

Entered: Jul 26 2006 07:55:06:613AM

Author: Bill Rowan

The second half of 1060725 was for MP 444b and consisted of shots
013 - 024. ICRF was applied early in the discharge. The density from 0.3 to
0.5 s had to be carefully controlled The ICRF made this tricky. Adjustments
in PG3 were relatively successful in controlling the density.

Flourine was high on the RGA.

Plasma interaction was observed at the LH antenna on shot 017. This persisted
and the LH antenna was withdrawm between shots 018 and 019. The next few shots
disrupted early. The next full length shot was 022. This and subsequent shots
had signficant injections. The disruptions may have been due to residual
effects of the LH antenna problem. Although some minor changes were made prior
to shot 022, these probably had nothing to do with 022 being a full lenghth
shot. More likely, the impurities introduced by the LH antenna were just
burned out.

In spite of the problems, the SL reports observations of cascades.

Score Card

Plasmas 12 (013,014,015,016(0.52s),017(0.38s),018(0.36 s),019(0.36 s),
020(0.32 s),021(0.198 s),022,023,024)
Fizzles 0
Duds 0
-----------
total 12

Session Leader Comments

Jul 25 2006 09:05:39:823AM Jin-Seok Ko MP#460 Test of Effect of Fast Ions on MSE with Perpendicular Injection

1. MSE channel 7 connected to Bill's spectrometer and aligned with the white
plate and the lamp.

2. Bill doesn't need two scans to cover the whole range of the spectrum
including the 'blue' region.

3. Since we are puzzled by yesterday's aperturing test and we have saved
the number of shots now, we are going to do Set B, C, and D with
'full open' and '60%' closed.

4. One more shot was added as 'B0' where the slit of the spectrometer
will be changed from 100 um (current setting) to 50 um.

5. MSE configuration

polarizer out
shutter fully open
Ch7 connected to spectrometer

Apr 10 2007 08:56:40:940AM Steve Scott MP#460 Test of Effect of Fast Ions on MSE with Perpendicular Injection

1. MSE channel 7 connected to Bill's spectrometer and aligned with the white
plate and the lamp.

2. Bill doesn't need two scans to cover the whole range of the spectrum
including the 'blue' region.

3. Since we are puzzled by yesterday's aperturing test and we have saved
the number of shots now, we are going to do Set B, C, and D with
'full open' and '60%' closed.

4. One more shot was added as 'B0' where the slit of the spectrometer
will be changed from 100 um (current setting) to 50 um.

5. MSE configuration

polarizer out
shutter fully open
Ch7 connected to spectrometer

shot Set Chan Bt Gas EF Slit Beam comment
mtorr faults

001 A 7 5.4 3 EF4=5
002 A/B 7 5.4 3 EF4=5 PEM is off
003 A/B 7 5.4 4 EF4=5 200 many
004 A/B 7 5.4 2 EF4=5 200 3
005 A/B 7 5.4 1 EF4=5 200 3
006 C1 7 2.0 1 EF4=5 200 4
007 D1 7 2.0 1 EF3/4=12/5 200 4 big blue feature
008 D1a 7 5.4 1 EF3/4=12/5 200 many
009 E1 0 2.0 1 EF3/4=12/5 200 1
010 E1a 0 2.0 1 EF4=5 200 2
011 E1b 0 5.4 1 EF4=5 200 2
012 E1c 0 5.4 1 EF3/4=12/5 200 2

Jul 25 2006 09:55:11:497AM 1060725001 Jin-Seok Ko Set A

BT = 5.4T
He = 3 mTorr

EF4 = 5 kA

1. We found PEM had been on so far....
It was turned off for next shots.

2. Spectrum

seems to be no blue feature

3. The next shot : same condition with PEM off

Jul 25 2006 09:59:41:357AM 1060725002 Jin-Seok Ko Set A (or B)

BT = 5.4T
He = 3 mTorr

EF4 = 5 kA

1. PEM is off

2. Spectrum

seems to be something on the blue side but not enough

3. The next shot

He = 4 mTorr
Spectrometer slit will be increased (200 um)

Jul 25 2006 10:14:27:190AM 1060725003 Jin-Seok Ko Set A (or B)

BT = 5.4T
He = 4 mTorr
EF4 = 5 kA

Beam : 49keV, 6 ~ 5.5A, many faults but seems to be useful

Some blue feature but still weak.

The He pressure will be decreased to 3 mTorr
The slit size will be the same (200 um)

Jul 25 2006 10:46:35:500AM 1060725004 Jin-Seok Ko Set A (or B)

BT = 5.4T
He = 2 mTorr
EF4 = 5 kA

Beam : 50 to 49 keV, 6 ~ 5.5A, 3 faults
Spectrometer : slit 200 um (unchanged.)

The signal was increased including some blue features

Bill conjecture: Yesterday, the reionized components still followed the beam neutrals,
emitting Halpha, which added to the signal strength. Today, with fields on,
no such reionized components are on the beam trajectory anymore.

We will decrease the pressure to 1 mTorr.

Jul 25 2006 10:52:40:863AM 1060725005 Jin-Seok Ko Set A (or B)

BT = 5.4 T
He = 1 mTorr
EF4 = 5 kA

Beam : 50 to 49 keV, 6 ~ 5.5A, 3 faults
Spectrometer : slit 200 um (unchanged.)

The signal was further increased including some blue features so
the optimum pressure for the subsequent shots will be He = 1 mTorr

Will move to C1 (BT=2.0T)

Jul 25 2006 11:17:04:433AM 1060725006 Jin-Seok Ko Set C1

BT = 2.0 T
He = 1 mTorr
EF4 = 5 kA

Beam : 50 to 49 keV, 6 ~ 5.5A, 4 faults
Spectrometer : slit 200 um (unchanged.)

The blue feature marginally decreases compared to the 5.4T shots

Will move to D1 ("EF_2" configuration) - EF3=12 kA, EF4=5 kA

Jul 25 2006 11:29:51:517AM 1060725007 Jin-Seok Ko Set D1

BT = 2.0 T
He = 1 mTorr
EF3 = 12 kA, EF4 = 5 kA

Beam : 49 keV, 5.5A, 4 faults
Spectrometer : slit 200 um (unchanged.)

The blue feature changed its structure - the biggest change ever.
The magnitude is the same.

Will do "D1a" where BT=5.4 T and EF3 = 12 kA / EF4 = 5 kA

Jul 25 2006 11:59:01:920AM 1060725008 Jin-Seok Ko Set D1a

BT = 5.4 T
He = 1 mTorr
EF3 = 12 kA, EF4 = 5 kA

Beam : 50 keV, 5.5A, many faults
Spectrometer : slit 200 um (unchanged.)

The blue feature changed from the previous shot

Will do "D1b" where BT=2.0 T and EF3 = 12 kA / EF4 = OFF, which is
somehow an intermmediate value between 7 and 8.

Jul 25 2006 12:50:42:237PM 1060725009 Jin-Seok Ko Cell access took place after the shot 8 for checking the DNB.

There seemed to be no time to do "D1b" and to have the cell access after this
for changing the fiber bundles. So we gave up "D1b" and had the cell access
for changing the fiber bundle during this cell access.

So this shot is for Set E1
We have chosen the EF configuration which gave the largest change in the
structure for ch7 spectrum.

MSE channel = 0
BT = 2.0 T
He = 1 mTorr
EF3 = 12 kA, EF4 = 5 kA

Beam : 50keV, 6A, one fault
Spectrometer : slit 200 um (unchanged.)

Saw the blue feature and qualitatively agrees with Steve's prediction:
The quicker termination of blue feature for edge channel.

Jul 25 2006 12:58:17:083PM 1060725010 Jin-Seok Ko E1a

MSE channel = 0
BT = 2.0 T
He = 1 mTorr
EF4 = 5 kA

Beam : 50keV, 6A, 2 fault
Spectrometer : slit 200 um (unchanged.)

blue feature reduced. no plateau

Jul 25 2006 01:07:18:197PM 1060725011 Jin-Seok Ko E1b

MSE channel = 0
BT = 5.4 T
He = 1 mTorr
EF4 = 5 kA

Beam : 50keV, 6A, 2 faults
Spectrometer : slit 200 um (unchanged.)

We will have one more shot owing to Miklos's and Eric's generosity!

Jul 25 2006 01:29:43:000PM 1060725012 Jin-Seok Ko E1c

MSE channel = 0
BT = 5.4 T
He = 1 mTorr
EF3 = 12 kA, EF4 = 5 kA

Beam : 50keV, 6A, 2 faults
Spectrometer : slit 200 um (unchanged.)

The end of the morning run

Jul 26 2006 11:47:19:050AM 1060725013 Eric Edlund First shot after a long cell access. PCI not working as well as last night, but still 24 good channels, may lose some HFS observation.

Good plasma, full length

PCI time window set incorrectly

Jul 25 2006 02:30:46:370PM 1060725014 Eric Edlund Incresed total RF power to 2.5 MW
attempt to decrese densty resulted in a slight increase???

LH start at 0.4 seconds

one down chirping mode, many TAE's

Jul 25 2006 02:44:55:840PM 1060725015 Eric Edlund Lowered density to about 0.55 nl_04

Strong cascade activity. Grand cascades.

Sawteeth delayed until about 0.3 seconds.

Jul 25 2006 03:14:45:283PM 1060725016 Eric Edlund good cascades, no base frequency obvious. Cascades coming in late, sawteeth delayed.

no power on J until about 0.15, repeat and try to tune in J.

Jul 25 2006 03:30:45:037PM 1060725017 Eric Edlund J port full power by 0.15 seconds. No cascade activity. LH grll glowing, Langmuir probes melted?

Try to start J at 0.09 seconds to give it some extra time to tune in.

Jul 25 2006 03:55:47:200PM 1060725018 Eric Edlund No cascades. Perhaps Zeff is too high, increased to about 3.5 at 0.15 seconds, from about 2.5 in shot 015.

LH grill still lighting up.

Jul 25 2006 04:05:57:987PM 1060725019 Eric Edlund No cascades, injection in ramp-up perhaps causing bad coupling. Try again.

Jul 25 2006 04:21:12:663PM 1060725020 Eric Edlund No cascades again. Zeff is perhaps a problem.

Turn off RF and see if plasma control can be recovered.

Jul 25 2006 04:28:44:900PM 1060725021 Eric Edlund No RF, disruption.

Raise density, try to clean out.

Jul 25 2006 04:55:18:820PM 1060725022 Eric Edlund No RF, restored plasma.

Jul 25 2006 04:56:37:910PM 1060725023 Eric Edlund P_RF ~ 2 MW

cascdes restored, nl_04 ~ 0.68 at 0.150

try to lower density and cross our fingers

Physics Operator Comments

Jul 25 2006 08:45:11:283AM Robert Granetz Shots 1050830011 and 014 are not available for loading. Tom Fredian is working
on it.

Jul 25 2006 09:31:01:830AM Robert Granetz Reacalled shot 1050830011, but since we now have a long pulse beam, zillions of power
supply settings, PLC settings, and programmed waveforms had to be extended. I've
also requested that the torus valve remain closed during the shot.

Fueling is from PG4 (B-top), which has 6 psi of He. All other valves are disabled.

Jul 26 2006 07:35:16:827AM Bill Rowan The second half of 1060725 was for MP 444b and consisted of shots
013 - 024. ICRF was applied early in the discharge. The density from 0.3 to
0.5 s had to be carefully controlled The ICRF made this tricky. Adjustments
in PG3 were relatively successful in controlling the density.

Flourine was high on the RGA.

Plasma interaction was observed at the LH antenna on shot 017. This persisted
and the LH antenna was withdrawm between shots 018 and 019. The next few shots
disrupted early. The next full length shot was 022. This and subsequent shots
had signficant injections. The disruptions may have been due to residual
effects of the LH antenna problem. Although some minor changes were made prior
to shot 022, these probably had nothing to do with 022 being a full lenghth
shot. More likely, the impurities introduced by the LH antenna were just
burned out.

In spite of the problems, the SL reports observations of cascades.

Score Card

Plasmas 12 (013,014,015,016(0.52s),017(0.38s),018(0.36 s),019(0.36 s),
020(0.32 s),021(0.198 s),022,023,024)
Fizzles 0
Duds 0
-----------
total 12

Jul 25 2006 09:49:21:887AM 1060725001 Robert Granetz Shot 01 -- We got everything we wanted on the first try! No mistakes or oversights!

Bt=5.4 T (to 1.6 s)
EF4=5 kA (to 1.6 s)
EF3=0 (to 1.6 s)
Beam fired from t=0.5 to 1.6 s with some faulting.
Pressure = 3 mTorr He (B-bottom MKS capacitance gauge, since we're using helium)

Jul 25 2006 10:00:32:140AM 1060725002 Robert Granetz Shot 02 -- Beam fired, t=0.5-1.6 s. Lots of faulting.
5.4 T
EF4=5 kA
EF3=0 kA
3 mTorr He

Next shot: increase pressure to 4 mTorr by starting PG4 earlier. Also open
up the slit on Bill's spectrometer.

Jul 25 2006 10:11:12:707AM 1060725003 Robert Granetz Shot 03 -- Beam fired, t=0.5-1.6 s.
5.4 T
EF4=5 kA
EF3=0 kA
4 mTorr He

Next shot: reduce helium pressure to 2 mTorr (by shortening the PG4 pulse).

Jul 25 2006 10:37:43:840AM 1060725004 Robert Granetz
Shot 04 -- Beam fired (t=0.5-1.6 s). Lots of faulting. Bt=5.4 T EF4=5 kA EF3=0 kA 2 mTorr He Next shot: drop He pressure to 1 mTorr

Jul 25 2006 10:49:40:643AM 1060725005 Robert Granetz
Shot 05 -- Beam fired (t=0.5-1.6 s). Bt=5.4 T EF4=5 kA EF3=0 kA 1 mTorr He Next shot: reduce Btor to 2 T. Stay at this He pressure

Jul 25 2006 11:19:59:500AM 1060725006 Robert Granetz
Shot 06 -- Beam fired (t=0.5-1.6 s). Bt=2.1 T EF4=5 kA EF3=0 kA 1 mTorr He Next shot: turn on EF3 at 12 kA.

Jul 25 2006 11:42:47:397AM 1060725007 Robert Granetz
Shot 07 -- Beam fired (t=0.5-1.6 s). Bt=2.1 T EF4=5 kA EF3=11.4 kA 1 mTorr He Next shot: raise Btor to 5.4 T. Also start EF4 waveform 0.25 s later to avoid IOC limit.

Jul 25 2006 11:54:23:400AM 1060725008 Robert Granetz
Shot 08 -- Beam fired (t=0.5-1.6 s). Had long fault. Bt=5.4 T EF4=5 kA EF3=11.3 kA 1 mTorr He Next shot: no EF4, Btor=2 T, EF3=12 kA

Jul 25 2006 12:23:58:490PM 1060725008 Robert Granetz BiRa camac module that controls gas flow to the beam source failed on shot 8
and required a cell access. Because of this delay, it was decided to switch
fibers to channel 0, since this also requires cell access.

Jul 25 2006 12:25:13:257PM 1060725008 Robert Granetz Shot 9 will use channel 0, with Btor=2 T, EF3=12 kA, and EF4=5 kA

Jul 25 2006 12:45:08:860PM 1060725009 Robert Granetz
Shot 09 -- Beam fired (t=0.5-1.6 s). Bt=2.1 T EF4=5 kA EF3=11.3 kA 1 mTorr He Next shot: Turn off EF3, Btor=2 T, EF4=5 kA

Jul 25 2006 12:54:06:520PM 1060725010 Robert Granetz
Shot 10 -- Beam fired (t=0.5-1.6 s). Bt=2.1 T EF4=5 kA EF3=0 kA 1 mTorr He Next shot: Btor=5.4 T, EF4=5 kA, EF3 off.

Jul 25 2006 01:06:08:850PM 1060725011 Robert Granetz
Shot 11 -- Beam fired (t=0.5-1.6 s). Bt=5.4 T EF4=5 kA EF3=0 kA 1 mTorr He Next shot: Turn EF3 back on (12 kA0. Btor=5.4 T, EF4=5 kA

Jul 25 2006 01:18:22:137PM 1060725012 Robert Granetz
Shot 12 -- Beam fired (t=0.5-1.6 s). Bt=5.4 T EF4=5 kA EF3=11.3 kA 1 mTorr He End of the DNB half-day run.

Jul 25 2006 01:38:27:113PM 1060725013 Bill Rowan Starting MP 444b
Session Leader: Edlund

Purge and fill B-top and B-main to values in PO setup

Correction to PO Plan. PCI in low k configuration

Load 1060705012
Copu 1060721027 segment 1 to segment 1

Torus gate valve is now open

Soft x-ray pha gate valve is enabled

Jul 25 2006 02:16:55:457PM 1060725013 Bill Rowan Plasma.

Next shot: SL requests nl_04 reduced by 20%
reduced nl_04 demand from 7e19 to 5.5e+19

Jul 25 2006 02:48:07:580PM 1060725014 Bill Rowan 014
Plasma

Next shot.
PG3 in segment 1 reduced in attempt to reduced the early density

Jul 25 2006 02:47:51:703PM 1060725015 Bill Rowan 015.
Plasma
nl_04 = 2.78e+19 at 0.1 s for this shot
nl_04 = 4.3e+19 at 0.1 s for shot 014

Next shot.
No pcs changes
RF power changed

Jul 25 2006 03:00:12:357PM 1060725016 Bill Rowan 016.
Plasma
Disruption at 0.5202
wpi bolo increaseing before the disruption. something fell in
Cell access after this shot for LH.

Next shot.
nl_04 = 5.0e+19

Jul 25 2006 03:04:52:603PM 1060725016 Bill Rowan Enabled Argon, PG1, 40 ms puff at 0.8 s

Jul 25 2006 03:25:50:830PM 1060725017 Bill Rowan 017.
Plasma
Disruption at 0.38s
Pyrotechnics at LH antenna
Cell access after this shot for LH

Jul 25 2006 03:41:40:680PM 1060725017 Bill Rowan
Next shot
No pcs changes

Jul 25 2006 03:53:09:950PM 1060725018 Bill Rowan 018.
Plasma
Disruption at 0.36 s
Pyrotechnics at LH antenna
Cell access aft this shot for LH
High runaways

Next shot.
Increased PG3
Increased PG4 by 2 ms to 21 ms

Jul 25 2006 04:04:48:410PM 1060725019 Bill Rowan 019.
Plasma
Disruption at 0.36 s

Next shot.
Increased PG4 from 22 ms to 23 ms
Disabled PG1

Jul 25 2006 04:21:00:023PM 1060725020 Bill Rowan 020.
Plasma
Disruption at 0.32 s
No cascades in the first 0.32 s

Next shot.
Turn the RF off for one shot.

Jul 25 2006 04:29:12:450PM 1060725021 Bill Rowan 021.
Plasma
Disruption at 0.198 s

Next shot.
Increase nl_04 to approx 0.8e+20 at request of SL

Jul 25 2006 04:44:51:847PM 1060725022 Bill Rowan 022. Plasma. Full length

Next shot.
RF will be on

Jul 25 2006 04:55:40:710PM 1060725023 Bill Rowan 023. Plasma. Full length

Next shot.
nl_04 to 5.0e+19

Engineering Operator Comments

Shot Time Type Status Comment

1 09:23:34:687AM Test Ok DNB into gas TF and EF4 only

2 09:44:02:850AM Test Ok DNB into gas TF and EF4 only

3 10:03:49:280AM Test Ok DNB into gas, TF and EF4 only

4 10:29:47:480AM Test Ok DNB into gas, TF and EF4 only

5 10:44:48:970AM Test Ok DNB into gas, TF and EF4 only

6 10:58:45:270AM Test Ok DNB into gas, TF and EF4 only

7 11:16:51:717AM Test Ok EF3 breaker tripped during down ramp

8 11:46:09:727AM Test Ok

9 12:36:44:167PM Test Ok

10 12:49:43:267PM Test Ok

11 01:03:03:053PM Test Ok

12 01:15:35:260PM Test Ok

13 02:07:14:233PM Plasma Ok

14 02:20:09:287PM Plasma Ok

15 02:33:22:807PM Plasma Ok

16 02:50:07:533PM Plasma Ok

17 03:18:25:953PM Plasma Ok

18 03:43:16:680PM Plasma Ok

19 03:55:46:140PM Plasma Ok

20 04:11:01:490PM Plasma Ok

21 04:23:36:243PM Plasma Ok

22 04:36:52:390PM Plasma Ok

23 04:49:28:503PM Plasma Ok

24 05:01:49:523PM Plasma Ok

Session Leader Comments
Jul 25 2006 09:05:39:823AM		Jin-Seok Ko	MP#460 Test of Effect of Fast Ions on MSE with Perpendicular Injection 1. MSE channel 7 connected to Bill's spectrometer and aligned with the white plate and the lamp. 2. Bill doesn't need two scans to cover the whole range of the spectrum including the 'blue' region. 3. Since we are puzzled by yesterday's aperturing test and we have saved the number of shots now, we are going to do Set B, C, and D with 'full open' and '60%' closed. 4. One more shot was added as 'B0' where the slit of the spectrometer will be changed from 100 um (current setting) to 50 um. 5. MSE configuration polarizer out shutter fully open Ch7 connected to spectrometer
Apr 10 2007 08:56:40:940AM		Steve Scott	MP#460 Test of Effect of Fast Ions on MSE with Perpendicular Injection 1. MSE channel 7 connected to Bill's spectrometer and aligned with the white plate and the lamp. 2. Bill doesn't need two scans to cover the whole range of the spectrum including the 'blue' region. 3. Since we are puzzled by yesterday's aperturing test and we have saved the number of shots now, we are going to do Set B, C, and D with 'full open' and '60%' closed. 4. One more shot was added as 'B0' where the slit of the spectrometer will be changed from 100 um (current setting) to 50 um. 5. MSE configuration polarizer out shutter fully open Ch7 connected to spectrometer shot Set Chan Bt Gas EF Slit Beam comment mtorr faults 001 A 7 5.4 3 EF4=5 002 A/B 7 5.4 3 EF4=5 PEM is off 003 A/B 7 5.4 4 EF4=5 200 many 004 A/B 7 5.4 2 EF4=5 200 3 005 A/B 7 5.4 1 EF4=5 200 3 006 C1 7 2.0 1 EF4=5 200 4 007 D1 7 2.0 1 EF3/4=12/5 200 4 big blue feature 008 D1a 7 5.4 1 EF3/4=12/5 200 many 009 E1 0 2.0 1 EF3/4=12/5 200 1 010 E1a 0 2.0 1 EF4=5 200 2 011 E1b 0 5.4 1 EF4=5 200 2 012 E1c 0 5.4 1 EF3/4=12/5 200 2
Jul 25 2006 09:55:11:497AM	1060725001	Jin-Seok Ko	Set A BT = 5.4T He = 3 mTorr EF4 = 5 kA 1. We found PEM had been on so far.... It was turned off for next shots. 2. Spectrum seems to be no blue feature 3. The next shot : same condition with PEM off
Jul 25 2006 09:59:41:357AM	1060725002	Jin-Seok Ko	Set A (or B) BT = 5.4T He = 3 mTorr EF4 = 5 kA 1. PEM is off 2. Spectrum seems to be something on the blue side but not enough 3. The next shot He = 4 mTorr Spectrometer slit will be increased (200 um)
Jul 25 2006 10:14:27:190AM	1060725003	Jin-Seok Ko	Set A (or B) BT = 5.4T He = 4 mTorr EF4 = 5 kA Beam : 49keV, 6 ~ 5.5A, many faults but seems to be useful Some blue feature but still weak. The He pressure will be decreased to 3 mTorr The slit size will be the same (200 um)
Jul 25 2006 10:46:35:500AM	1060725004	Jin-Seok Ko	Set A (or B) BT = 5.4T He = 2 mTorr EF4 = 5 kA Beam : 50 to 49 keV, 6 ~ 5.5A, 3 faults Spectrometer : slit 200 um (unchanged.) The signal was increased including some blue features Bill conjecture: Yesterday, the reionized components still followed the beam neutrals, emitting Halpha, which added to the signal strength. Today, with fields on, no such reionized components are on the beam trajectory anymore. We will decrease the pressure to 1 mTorr.
Jul 25 2006 10:52:40:863AM	1060725005	Jin-Seok Ko	Set A (or B) BT = 5.4 T He = 1 mTorr EF4 = 5 kA Beam : 50 to 49 keV, 6 ~ 5.5A, 3 faults Spectrometer : slit 200 um (unchanged.) The signal was further increased including some blue features so the optimum pressure for the subsequent shots will be He = 1 mTorr Will move to C1 (BT=2.0T)
Jul 25 2006 11:17:04:433AM	1060725006	Jin-Seok Ko	Set C1 BT = 2.0 T He = 1 mTorr EF4 = 5 kA Beam : 50 to 49 keV, 6 ~ 5.5A, 4 faults Spectrometer : slit 200 um (unchanged.) The blue feature marginally decreases compared to the 5.4T shots Will move to D1 ("EF_2" configuration) - EF3=12 kA, EF4=5 kA
Jul 25 2006 11:29:51:517AM	1060725007	Jin-Seok Ko	Set D1 BT = 2.0 T He = 1 mTorr EF3 = 12 kA, EF4 = 5 kA Beam : 49 keV, 5.5A, 4 faults Spectrometer : slit 200 um (unchanged.) The blue feature changed its structure - the biggest change ever. The magnitude is the same. Will do "D1a" where BT=5.4 T and EF3 = 12 kA / EF4 = 5 kA
Jul 25 2006 11:59:01:920AM	1060725008	Jin-Seok Ko	Set D1a BT = 5.4 T He = 1 mTorr EF3 = 12 kA, EF4 = 5 kA Beam : 50 keV, 5.5A, many faults Spectrometer : slit 200 um (unchanged.) The blue feature changed from the previous shot Will do "D1b" where BT=2.0 T and EF3 = 12 kA / EF4 = OFF, which is somehow an intermmediate value between 7 and 8.
Jul 25 2006 12:50:42:237PM	1060725009	Jin-Seok Ko	Cell access took place after the shot 8 for checking the DNB. There seemed to be no time to do "D1b" and to have the cell access after this for changing the fiber bundles. So we gave up "D1b" and had the cell access for changing the fiber bundle during this cell access. So this shot is for Set E1 We have chosen the EF configuration which gave the largest change in the structure for ch7 spectrum. MSE channel = 0 BT = 2.0 T He = 1 mTorr EF3 = 12 kA, EF4 = 5 kA Beam : 50keV, 6A, one fault Spectrometer : slit 200 um (unchanged.) Saw the blue feature and qualitatively agrees with Steve's prediction: The quicker termination of blue feature for edge channel.
Jul 25 2006 12:58:17:083PM	1060725010	Jin-Seok Ko	E1a MSE channel = 0 BT = 2.0 T He = 1 mTorr EF4 = 5 kA Beam : 50keV, 6A, 2 fault Spectrometer : slit 200 um (unchanged.) blue feature reduced. no plateau
Jul 25 2006 01:07:18:197PM	1060725011	Jin-Seok Ko	E1b MSE channel = 0 BT = 5.4 T He = 1 mTorr EF4 = 5 kA Beam : 50keV, 6A, 2 faults Spectrometer : slit 200 um (unchanged.) We will have one more shot owing to Miklos's and Eric's generosity!
Jul 25 2006 01:29:43:000PM	1060725012	Jin-Seok Ko	E1c MSE channel = 0 BT = 5.4 T He = 1 mTorr EF3 = 12 kA, EF4 = 5 kA Beam : 50keV, 6A, 2 faults Spectrometer : slit 200 um (unchanged.) The end of the morning run
Jul 26 2006 11:47:19:050AM	1060725013	Eric Edlund	First shot after a long cell access. PCI not working as well as last night, but still 24 good channels, may lose some HFS observation. Good plasma, full length PCI time window set incorrectly
Jul 25 2006 02:30:46:370PM	1060725014	Eric Edlund	Incresed total RF power to 2.5 MW attempt to decrese densty resulted in a slight increase??? LH start at 0.4 seconds one down chirping mode, many TAE's
Jul 25 2006 02:44:55:840PM	1060725015	Eric Edlund	Lowered density to about 0.55 nl_04 Strong cascade activity. Grand cascades. Sawteeth delayed until about 0.3 seconds.
Jul 25 2006 03:14:45:283PM	1060725016	Eric Edlund	good cascades, no base frequency obvious. Cascades coming in late, sawteeth delayed. no power on J until about 0.15, repeat and try to tune in J.
Jul 25 2006 03:30:45:037PM	1060725017	Eric Edlund	J port full power by 0.15 seconds. No cascade activity. LH grll glowing, Langmuir probes melted? Try to start J at 0.09 seconds to give it some extra time to tune in.
Jul 25 2006 03:55:47:200PM	1060725018	Eric Edlund	No cascades. Perhaps Zeff is too high, increased to about 3.5 at 0.15 seconds, from about 2.5 in shot 015. LH grill still lighting up.
Jul 25 2006 04:05:57:987PM	1060725019	Eric Edlund	No cascades, injection in ramp-up perhaps causing bad coupling. Try again.
Jul 25 2006 04:21:12:663PM	1060725020	Eric Edlund	No cascades again. Zeff is perhaps a problem. Turn off RF and see if plasma control can be recovered.
Jul 25 2006 04:28:44:900PM	1060725021	Eric Edlund	No RF, disruption. Raise density, try to clean out.
Jul 25 2006 04:55:18:820PM	1060725022	Eric Edlund	No RF, restored plasma.
Jul 25 2006 04:56:37:910PM	1060725023	Eric Edlund	P_RF ~ 2 MW cascdes restored, nl_04 ~ 0.68 at 0.150 try to lower density and cross our fingers

Physics Operator Comments
Jul 25 2006 08:45:11:283AM		Robert Granetz	Shots 1050830011 and 014 are not available for loading. Tom Fredian is working on it.
Jul 25 2006 09:31:01:830AM		Robert Granetz	Reacalled shot 1050830011, but since we now have a long pulse beam, zillions of power supply settings, PLC settings, and programmed waveforms had to be extended. I've also requested that the torus valve remain closed during the shot. Fueling is from PG4 (B-top), which has 6 psi of He. All other valves are disabled.
Jul 26 2006 07:35:16:827AM		Bill Rowan	The second half of 1060725 was for MP 444b and consisted of shots 013 - 024. ICRF was applied early in the discharge. The density from 0.3 to 0.5 s had to be carefully controlled The ICRF made this tricky. Adjustments in PG3 were relatively successful in controlling the density. Flourine was high on the RGA. Plasma interaction was observed at the LH antenna on shot 017. This persisted and the LH antenna was withdrawm between shots 018 and 019. The next few shots disrupted early. The next full length shot was 022. This and subsequent shots had signficant injections. The disruptions may have been due to residual effects of the LH antenna problem. Although some minor changes were made prior to shot 022, these probably had nothing to do with 022 being a full lenghth shot. More likely, the impurities introduced by the LH antenna were just burned out. In spite of the problems, the SL reports observations of cascades. Score Card Plasmas 12 (013,014,015,016(0.52s),017(0.38s),018(0.36 s),019(0.36 s), 020(0.32 s),021(0.198 s),022,023,024) Fizzles 0 Duds 0 ----------- total 12
Jul 25 2006 09:49:21:887AM	1060725001	Robert Granetz	Shot 01 -- We got everything we wanted on the first try! No mistakes or oversights! Bt=5.4 T (to 1.6 s) EF4=5 kA (to 1.6 s) EF3=0 (to 1.6 s) Beam fired from t=0.5 to 1.6 s with some faulting. Pressure = 3 mTorr He (B-bottom MKS capacitance gauge, since we're using helium)
Jul 25 2006 10:00:32:140AM	1060725002	Robert Granetz	Shot 02 -- Beam fired, t=0.5-1.6 s. Lots of faulting. 5.4 T EF4=5 kA EF3=0 kA 3 mTorr He Next shot: increase pressure to 4 mTorr by starting PG4 earlier. Also open up the slit on Bill's spectrometer.
Jul 25 2006 10:11:12:707AM	1060725003	Robert Granetz	Shot 03 -- Beam fired, t=0.5-1.6 s. 5.4 T EF4=5 kA EF3=0 kA 4 mTorr He Next shot: reduce helium pressure to 2 mTorr (by shortening the PG4 pulse).
Jul 25 2006 10:37:43:840AM	1060725004	Robert Granetz	Shot 04 -- Beam fired (t=0.5-1.6 s). Lots of faulting. Bt=5.4 T EF4=5 kA EF3=0 kA 2 mTorr He Next shot: drop He pressure to 1 mTorr
Jul 25 2006 10:49:40:643AM	1060725005	Robert Granetz	Shot 05 -- Beam fired (t=0.5-1.6 s). Bt=5.4 T EF4=5 kA EF3=0 kA 1 mTorr He Next shot: reduce Btor to 2 T. Stay at this He pressure
Jul 25 2006 11:19:59:500AM	1060725006	Robert Granetz	Shot 06 -- Beam fired (t=0.5-1.6 s). Bt=2.1 T EF4=5 kA EF3=0 kA 1 mTorr He Next shot: turn on EF3 at 12 kA.
Jul 25 2006 11:42:47:397AM	1060725007	Robert Granetz	Shot 07 -- Beam fired (t=0.5-1.6 s). Bt=2.1 T EF4=5 kA EF3=11.4 kA 1 mTorr He Next shot: raise Btor to 5.4 T. Also start EF4 waveform 0.25 s later to avoid IOC limit.
Jul 25 2006 11:54:23:400AM	1060725008	Robert Granetz	Shot 08 -- Beam fired (t=0.5-1.6 s). Had long fault. Bt=5.4 T EF4=5 kA EF3=11.3 kA 1 mTorr He Next shot: no EF4, Btor=2 T, EF3=12 kA
Jul 25 2006 12:23:58:490PM	1060725008	Robert Granetz	BiRa camac module that controls gas flow to the beam source failed on shot 8 and required a cell access. Because of this delay, it was decided to switch fibers to channel 0, since this also requires cell access.
Jul 25 2006 12:25:13:257PM	1060725008	Robert Granetz	Shot 9 will use channel 0, with Btor=2 T, EF3=12 kA, and EF4=5 kA
Jul 25 2006 12:45:08:860PM	1060725009	Robert Granetz	Shot 09 -- Beam fired (t=0.5-1.6 s). Bt=2.1 T EF4=5 kA EF3=11.3 kA 1 mTorr He Next shot: Turn off EF3, Btor=2 T, EF4=5 kA
Jul 25 2006 12:54:06:520PM	1060725010	Robert Granetz	Shot 10 -- Beam fired (t=0.5-1.6 s). Bt=2.1 T EF4=5 kA EF3=0 kA 1 mTorr He Next shot: Btor=5.4 T, EF4=5 kA, EF3 off.
Jul 25 2006 01:06:08:850PM	1060725011	Robert Granetz	Shot 11 -- Beam fired (t=0.5-1.6 s). Bt=5.4 T EF4=5 kA EF3=0 kA 1 mTorr He Next shot: Turn EF3 back on (12 kA0. Btor=5.4 T, EF4=5 kA
Jul 25 2006 01:18:22:137PM	1060725012	Robert Granetz	Shot 12 -- Beam fired (t=0.5-1.6 s). Bt=5.4 T EF4=5 kA EF3=11.3 kA 1 mTorr He End of the DNB half-day run.
Jul 25 2006 01:38:27:113PM	1060725013	Bill Rowan	Starting MP 444b Session Leader: Edlund Purge and fill B-top and B-main to values in PO setup Correction to PO Plan. PCI in low k configuration Load 1060705012 Copu 1060721027 segment 1 to segment 1 Torus gate valve is now open Soft x-ray pha gate valve is enabled
Jul 25 2006 02:16:55:457PM	1060725013	Bill Rowan	Plasma. Next shot: SL requests nl_04 reduced by 20% reduced nl_04 demand from 7e19 to 5.5e+19
Jul 25 2006 02:48:07:580PM	1060725014	Bill Rowan	014 Plasma Next shot. PG3 in segment 1 reduced in attempt to reduced the early density
Jul 25 2006 02:47:51:703PM	1060725015	Bill Rowan	015. Plasma nl_04 = 2.78e+19 at 0.1 s for this shot nl_04 = 4.3e+19 at 0.1 s for shot 014 Next shot. No pcs changes RF power changed
Jul 25 2006 03:00:12:357PM	1060725016	Bill Rowan	016. Plasma Disruption at 0.5202 wpi bolo increaseing before the disruption. something fell in Cell access after this shot for LH. Next shot. nl_04 = 5.0e+19
Jul 25 2006 03:04:52:603PM	1060725016	Bill Rowan	Enabled Argon, PG1, 40 ms puff at 0.8 s
Jul 25 2006 03:25:50:830PM	1060725017	Bill Rowan	017. Plasma Disruption at 0.38s Pyrotechnics at LH antenna Cell access after this shot for LH
Jul 25 2006 03:41:40:680PM	1060725017	Bill Rowan	Next shot No pcs changes
Jul 25 2006 03:53:09:950PM	1060725018	Bill Rowan	018. Plasma Disruption at 0.36 s Pyrotechnics at LH antenna Cell access aft this shot for LH High runaways Next shot. Increased PG3 Increased PG4 by 2 ms to 21 ms
Jul 25 2006 04:04:48:410PM	1060725019	Bill Rowan	019. Plasma Disruption at 0.36 s Next shot. Increased PG4 from 22 ms to 23 ms Disabled PG1
Jul 25 2006 04:21:00:023PM	1060725020	Bill Rowan	020. Plasma Disruption at 0.32 s No cascades in the first 0.32 s Next shot. Turn the RF off for one shot.
Jul 25 2006 04:29:12:450PM	1060725021	Bill Rowan	021. Plasma Disruption at 0.198 s Next shot. Increase nl_04 to approx 0.8e+20 at request of SL
Jul 25 2006 04:44:51:847PM	1060725022	Bill Rowan	022. Plasma. Full length Next shot. RF will be on
Jul 25 2006 04:55:40:710PM	1060725023	Bill Rowan	023. Plasma. Full length Next shot. nl_04 to 5.0e+19

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	09:23:34:687AM	Test	Ok	DNB into gas TF and EF4 only
2	09:44:02:850AM	Test	Ok	DNB into gas TF and EF4 only
3	10:03:49:280AM	Test	Ok	DNB into gas, TF and EF4 only
4	10:29:47:480AM	Test	Ok	DNB into gas, TF and EF4 only
5	10:44:48:970AM	Test	Ok	DNB into gas, TF and EF4 only
6	10:58:45:270AM	Test	Ok	DNB into gas, TF and EF4 only
7	11:16:51:717AM	Test	Ok	EF3 breaker tripped during down ramp
8	11:46:09:727AM	Test	Ok
9	12:36:44:167PM	Test	Ok
10	12:49:43:267PM	Test	Ok
11	01:03:03:053PM	Test	Ok
12	01:15:35:260PM	Test	Ok
13	02:07:14:233PM	Plasma	Ok
14	02:20:09:287PM	Plasma	Ok
15	02:33:22:807PM	Plasma	Ok
16	02:50:07:533PM	Plasma	Ok
17	03:18:25:953PM	Plasma	Ok
18	03:43:16:680PM	Plasma	Ok
19	03:55:46:140PM	Plasma	Ok
20	04:11:01:490PM	Plasma	Ok
21	04:23:36:243PM	Plasma	Ok
22	04:36:52:390PM	Plasma	Ok
23	04:49:28:503PM	Plasma	Ok
24	05:01:49:523PM	Plasma	Ok