Alcator C-Mod Run 1031210 Information

Miniproposals

Miniproposal: 376

Date Filed: 11/25/2003

Title: Study of the Efficiency of ICRF Minority Heating and Investigation of the Cause of Low H-mode Plasma

First Author: Yijun Lin

Session Leader: Yijun Lin (shots 1-33)

Operators
Session leader(s):	Yijun Lin
Physics operator(s):	Bill Rowan
Engineering operator(s):	Bill Parkin,Bill Byford,Gary Dekow

Engineering Operator Run Comment
MP#376 ICRF Minority Heating and Low H-mode Plasma Performance; SL:Lin;

Session Leader Plans

Physics Operators Plans

Session Leader Summaries

Entered: Jul 7 2004 03:49:35:240PM

Author: Yijun Lin

Run summary:
One definite trend we have found is that plasma
performance degrades shot by shot. The other one
is that J-antenna may produce more impurities than
D and E antennas, so that the J antenna efficiency may
be 10-15% lower than D and E. All other parameters,
including outer gap, upper triangularity, lower triangularity,
plasma current, density, do not seem to matter.
Tentatively, I would conclude that the plasma performance is mostly
determined by the wall (and antennas?) condition
(boronization, impurity, radiation, etc).

Comparison with Helium plasmas will be done later.
In shot 32 and 31, dW/dt analysis shows that the rf absorption is
near 100% in Helium H-modes.
However, similar analysis in D plasmas shows dW/dt
at about 60%. More work to do.

Power scan (shot 2, 3, 4, 5, 6)
Delta_W is close to linear relation with the rf power.
The max stored energy achievable is also related to the
length of steady rf power. In shot 6, we got Wmax =
200 kJ at 4.7 MW level. The scaling is no worse than
that of 96-00.

current and power scan
0.6 MA, shot 7, 8, 9
0.8 MA, shot 10, 11, 12, 13
1.0 MA, shot 14
1.2 MA, shot 15, 16, 17
Nothing wrong has been found. Although the performance
was not fantastic, the plasmas are much better than
the norm we have had in the past two years. The scaling
is close to the average level of year 96-00.

Antenna comparison (18, 19, 21, 24, 25, 26)
J port seems to have more impurities than D and E.
As a result, in H-mode, J-port may have an heating efficiency
about 10-15% lower than D+E.

density scan:
Wmax are almost identical at the
last three shots (27, 28, 29). However, the performance
has definitely degraded through the day.

Helium plasmas: 30, 31, 32, 33
Wmax in Helium plasmas are generally smaller than Deuterium plasmas.
H-modes are shorter. However, the antennas seem not to care the
L-H transitions in these plasmas. (Why?)
dW/dt analysis is to be done in order
to compare rf absorption in deuterium plasmas.
dW/dt found near 100% absorption in shot 32 and shot 31 in H-mode.
dw/dt is about 50% in L-mode as seen from shot 31.

Physics Operator Summaries

Entered: Jul 7 2004 04:37:19:973PM

Author: Bill Rowan

Physop Summary for Wednesday, December 10, 2003. 1031210.

Purpose: MP#376 --- Study of the Efficiency of ICRF Minority Heating and
Investigation of the Cause of Low H-mode Plasma Performance

Session Leader: Lin
Physics Operator: Rowan
Engineering Operators: Dekow, Parkin, Byford

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=--=-=-=-
Physop Summary --------------------------------------------------------------

This was the second consecutive day for this MP. The run began today with the
RF fiducial shot (1031209001) which was also used yesterday. Shot 1031209020,
the optimized shape developed during 10310209 was then reloaded for density,
current, and RF power scans. See SL summary and log for details of the scans.

For the last four shots (030 through 033), the plasma was fueled (segment 2)
with helium after breakdown in D2 (segment 1).

Shot 020 disrupted early due to an impurity injection at approximately 0.25s.
The following two shots were fizzles.

On some shots, Li pellets were injected after 1.4 s and as late as the current
rampdown. MSE was synched with the pellet firing for comparisons.

Torrvac problems interferred with the manifold purge before
the run began. The problems were traced to a corrupted program which was
diagnosed before the run began and then corrected during the run. Note that
the PhysOp log for 1031209 mentions a Torrvac problem after shot 1031209001.

Score Card-------------------------------------------------------------------
Useful Plasmas 30 (001-019,021,024-029,030-033(He))
Early disruption 1 (020)
Fizzles 2 (022,023)

Total 33

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=--=-=-=-
Engineering setup------------------------------------------------------------

ECDC overnight in D2 at 2e-4 Torr.

Run begins at 09:00 and ends at 17:00.

Power systems the same as on 1031209019.

A-coils should be hooked up as on 1031204021 and the power supply should be enabled.

Gas 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)

Enable gatevalves (there will be no vacuum problems): ECE, VUV, DNB

-------------------------------------------------------------------------------
RF Setup: All 4 transmitters in Run On by 08:00
-------------------------------------------------------------------------------

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=--=-=-=-
Session Leader Run Plan------------------------------------------------------

This is a continuation of the experiment begun in run 1031209.

Fiducial shot for the two day experiment: (1 MA, BT~5.4 T, nl_04~0.8, standard shape)

Expext to start this second day with shot 1031209019 depending on progress on Tuesday.

Scan plasma current for fixed power (Prf ~ 4 MW)
1. for best performing shape scan plasma current (0.6,0.8,1.0,1.2 MA)
2. for poorest performing shape scan plasma current (0.6,0.8,1.0,1.2 MA)
Antenna comparison in H-mode
1. D, E, and J-port at 1 MW each, J-port at 3 MW
2. D and E at 3.0 MW, J-port at 3.0 MW
He plasma comparison
1. Fiducial discharge in He

for all discharges except the fiducial a programmed RF transition will occur at 1.2 sec
-------------------------------------------------------------------------------

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=--=-=-=-
Log--------------------------------------------------------------------------

Loaded shot 1031209001. Request of SL.

Due to problems with gas purge system, the plenums were filled manually. These are the
pressures.
Btop 5.5 psi D2
B side lower 1.1 psi Ar
C side 31.4 psi D2

Delay in start of operations due to problems with PLC control of gas purge system.
Will attempt to repair before continuing with run.

001. This is the fiducial shot. Repeating to assure that we have the same shot as yesterday.
Late start. PLC control not yet repaired. May stop for repairs later in the run when problem
is fully diagnosed.

DNB in operation.

Next shot. Load shot 1031209020.
This will be the beginning of the power scan.

002. Plasma.

Next shot.
Increase the prefill by 2 ms from 13 ms to 15 ms.

003. Plasma.

004. Plasma.

The purge problem from earlier this morning: The Torrvac program seems to have been corrupted
and is now corrected. Note that the PhysOp log for 1031209 mentions a Torrvac problem after
shot 1031209001. The purge valve was not used after that time until this morning.

Next shot. No PCS changes.

005. Plasma.

Not using the ratiomatic except for relative changes. Pressure seems to be reading low.

Next shot. Pellet injected at 1.75 s.

006. Plasma
Pellet evident at 1.75 s. Note plasma current, nel04. bolometer

Next shot. IP=0.6MA. Beginning of a current scan.

007. Plasma
IP = 0.6 MA
Note: Fringe skip on nel04.

Next shot.
Repeat to get the density diagnostic for the RF scan.
Tend TCI before the next shot.

008. Plasma
IP = 0.6 MA
TCI worked

Next shot.
Repeat

009. Plasma

Next shot.
IP = 0.8

010. Plasma

Next shot.
Repeat.

011. Plasma

Next shot.
Repeat.

012. Plasma.

Next shot.
No pcs changes.

013. Plasma

Next shot.
IP = 1.0 MA

014. Plasma

Next shot.
IP = 1.2 MA

015. Plasma

Next shot.
No PCS changes

016. Plasma

Next shot.
No PCS changes.

017. Plasma

Next shot.
IP = 1.0 MA

018. Plasma.

Next shot.
Repeat.

019. Plasma.
Disruption at 1.48s. Near the time of pellet injection.

Next shot.
No PCS changes.

020. Plasma. Very Early disruption. 0.25 s
Soft x-ray increase starting at 0.24 s
Te dropped precipitously at the edge at the same time.
Looks like something came in.
The discharge is similar to 019 prior to that time.

Next shot.
No PCS changes

021. Plasma.

Next shot.
No PCS changes

022. Fizzle.
Fields at breakdown are essentially the same as the previous shot.
Prefill pressure is slightly higher.

Next shot.
No changes made in response to fizzle
SL requested 5.2T. Changed Bfield current from -150kA to -140 kA

023. Fizzle.
Fields at breakdown are essentially the same as shot 021.

Next shot.
Reduce BR_0 by 0.2 mT

024. Plasma.

Next shot.
No PCS changes

Operators.
Dekow, Byford, Parkin.

025. Plasma.
Injection at 0.25 s. Similar to shot 020.

Next shot.
Repeat.

026. Plasma.

Next shot.
Reduce nel04 to 0.6e+20.
Beginning of a density scan.

027. Plasma.
nel04 = 0.69e+19

Next shot.
Bfield changed from 5.2 T to 5.4 T
Bfield current changed from -144000 to -150000
nel04 = 1.0e+20

028. Plasma
BT = 5.4 T
nel04 = 0.98e+20 at 0.52 s

Next shot.
nelo4 = 1.1e+20

029. Plasma
nel04 = 1.08e+20

Next shot.
He plasma. Breakdown in D2 (segment 1) and run (segment 2) in Helium.
Pump out C-Side and backfill with helium to 30 psi.

030. Plasma.
nel04 = 1.1e+20

Next shot.
Repeat

031. Plasma

Next shot.
Repeat

032. Plasma.

Next shot.
Repeat

033. Plasma

Last shot.

Session Leader Comments

Dec 10 2003 09:39:58:647AM 1031210001 Yijun Lin
shot 01
Load 1031209001
Fiducial shot. 1 MA. nl04 = 0.8e20 m^-2
Kappa = 1.7, right gap 0.8, delta_l = 0.56, delta_u= 0.29
RF step up 1, 2, 3, 4 MW. (requested)

Good shot. RF was at 4.9 MW (Don't know why it didn't take the requested waveform)
3 H-modes at 189, 198, and 200 kJ level.
It is much better than later yesterday.

Next: start power scan, load shape from 1031209020.

Dec 10 2003 09:48:35:193AM 1031210002 Yijun Lin shot 02: Load shot 1031209020
Ip: 1 MA, nl04: 0.9e20 m^-2
With D, E and J antennas (demand 0.6 MW from each transmitter)
Outer gap = 0.9 cm, delta_u = 0.3, delta_l = 0.5
Prf: 2.6 MW.
Wmax: 142 kJ
Wmax - Woh: 101 kJ
H factor: ~ 1.5

Next: Prf 3.5 MW.

Dec 10 2003 10:07:11:090AM 1031210003 Yijun Lin
Ip: 1 MA, nl04: 0.9e20 m^-2
With D, E and J antennas (demand 0.8 MW from each transmitter)
E port has two 30 ms notches at 0.9 sec
Outer gap = 0.9 cm, delta_u = 0.3, delta_l = 0.5
Prf: 3.6 MW.
Wmax: 153 kJ (Still rising, but then J port tripped.)
Wmax - Woh: 110 kJ
H factor: ~ 1.4

Next: Prf 4.5 MW.

Dec 10 2003 10:15:30:807AM 1031210004 Yijun Lin shot 04
Ip: 1 MA, nl04: 0.9e20 m^-2
With D, E and J antennas (demand 1.1 MW from each transmitter)
E port has two 30 ms notches at 0.9 sec
Outer gap = 0.9 cm, delta_u = 0.3, delta_l = 0.5
Prf: 4.9 MW.
Wmax: 182 kJ (Still rising, but then J port faulted out.)
Wmax - Woh: 140 kJ
H factor: ~ 1.8

Next: repeat. to get J run longer.

Dec 10 2003 10:27:25:543AM 1031210005 Yijun Lin shot 05
Ip: 1 MA, nl04: 0.9e20 m^-2
With D, E and J antennas (demand 1.1 MW from each transmitter)
E port has two 30 ms notches at 0.9 sec
Outer gap = 0.9 cm, delta_u = 0.3, delta_l = 0.5
Prf: 4.8 MW.
Wmax: 189 kJ (Still rising, but then J port faulted out.
J ran longer than shot 4)
Wmax - Woh: 150 kJ
H factor: ~ 1.7
Next: Lower J power. Same total power. repeat.

Dec 10 2003 10:39:53:980AM 1031210006 Yijun Lin shot 06:
Ip: 1 MA, nl04: 0.9e20 m^-2
With D, E and J antennas (demand 1.25 MW from D and E, 1.8 MW from J)
E port has a 30 ms notches at 0.9 sec
Outer gap = 0.9 cm, delta_u = 0.3, delta_l = 0.5
Prf: 4.8 MW.
Wmax: 199 kJ
Wmax - Woh: 159 kJ
H factor: ~ 1.7

Summary on power scan (shot 2, 3, 4, 5, 6)
Delta_W is close to linear relation with the rf power.
The max stored energy achievable is also related to the
length of steady rf power. In shot 6, we got Wmax =
200 kJ at 4.7 MW level. The scaling is no worse than
that of 96-00.

Next: start current scan. Prf = 4 MW.
run current at 0.6, 0.8, 1.0, 1.2 MA

Dec 10 2003 11:01:25:757AM 1031210007 Yijun Lin shot 07:
Ip: 0.6 MA, nl04: 0.9e20 m^-2
With D, E and J antennas (demand 0.9 MW from each transmitter).
E port has a 30 ms notches at 0.9 sec
Outer gap = 0.9 cm, delta_u = 0.3, delta_l = 0.5
Prf: 2.1 MW. (J did not match well).
Wmax: 61 kJ
Wmax - Woh: 40 kJ
H factor: ~ 1.0

(density might be wrong). Next repeat.

Dec 10 2003 11:11:24:500AM 1031210008 Yijun Lin shot 08:
Ip: 0.6 MA, nl04: 0.9e20 m^-2
With D, E and J antennas (demand 0.9 MW from each transmitter).
E port has a 30 ms notches at 0.9 sec
Outer gap = 0.9 cm, delta_u = 0.3, delta_l = 0.5
Prf: 2.1 MW. (J mismatched).
Wmax: 55.8 kJ
Wmax - Woh: 35 kJ
H factor: ~ 1.0

next repeat to get better rf.

Dec 10 2003 11:26:12:147AM 1031210009 Yijun Lin shot 09:
Ip: 0.6 MA, nl04: 0.9e20 m^-2
With D, E and J antennas (demand 0.9 MW from each transmitter).
E port has a 30 ms notches at 0.9 sec
Outer gap = 0.9 cm, delta_u = 0.3, delta_l = 0.5
Prf: 2.1 MW. (J mismatched).
Wmax: 58 kJ
Wmax - Woh: 38 kJ
H factor: ~ 1.0

Next: 800 kA

Dec 10 2003 11:55:48:673AM 1031210011 Yijun Lin shot 11:
Ip: 0.8 MA, nl04: 0.9e20 m^-2
E port has a 30 ms notches at 0.9 sec
Outer gap = 0.9 cm, delta_u = 0.3, delta_l = 0.5
Prf: 2.9 MW.
Wmax: 104 kJ
Wmax - Woh: 72 kJ
H factor: ~ 1.4

Next: repeat, to get 4 MW.

Dec 10 2003 12:19:02:007PM 1031210012 Yijun Lin
shot 12:
Ip: 0.8 MA, nl04: 0.9e20 m^-2
E port has a 30 ms notches at 0.9 sec
Outer gap = 0.9 cm, delta_u = 0.3, delta_l = 0.5
Prf: 4.1 MW.
Wmax: 131 kJ, kind of steady during the entire EDA.
Wmax - Woh: 97 kJ
H factor: ~ 1.4 - 1.5, Long EDA.

Next: More RF power.

Dec 10 2003 12:29:07:247PM 1031210013 Yijun Lin shot 13:
Ip: 0.8 MA, nl04: 0.9e20 m^-2
E port has a 30 ms notches at 0.9 sec
Outer gap = 0.9 cm, delta_u = 0.3, delta_l = 0.5
Prf: 5 MW.
Wmax: 169 kJ
Wmax - Woh: 136 kJ
H factor: ~ 1.8, Long EDA.
The plasma performance seems fine.

Next: 1.0 MA.

Dec 10 2003 12:47:22:020PM 1031210014 Yijun Lin shot 14:
Ip: 1.0 MA, nl04: 0.9e20 m^-2
E port has a 30 ms notches at 0.9 sec
Outer gap = 0.9 cm, delta_u = 0.3, delta_l = 0.5
Prf: 4.8 MW.
Wmax: 193 kJ
Wmax - Woh: 153 kJ
H factor: ~ 1.6, 3 H-modes

Next: 1.2 MA, needs A coil.

Dec 10 2003 01:03:34:897PM 1031210015 Yijun Lin shot 15:
Ip: 1.2 MA, nl04: 0.9e20 m^-2
E port has a 30 ms notches at 0.9 sec
Outer gap = 0.9 cm, delta_u = 0.3, delta_l = 0.5
Prf: 4.8 MW.
Wmax: 203 kJ
Wmax - Woh: 158 kJ
(It is 60% higher than other 1.2 MA shots in 2002 and 2003).
H factor: ~ 1.6, then downwards (radiation?)

Next: lower Prf.

Dec 10 2003 01:16:32:020PM 1031210016 Yijun Lin shot 16:
Ip: 1.2 MA, nl04: 0.9e20 m^-2
E port has a 30 ms notches at 0.9 sec
Outer gap = 0.9 cm, delta_u = 0.3, delta_l = 0.5
Prf: 3.8 MW.
Wmax: 171 kJ
Wmax - Woh: 135 kJ
(It is 50% higher than other 1.2 MA shots in 2002 and 2003).
H factor: ~ 1.6, then downwards (radiation?)

Dec 10 2003 01:35:43:900PM 1031210017 Yijun Lin shot 17:
Ip: 1.2 MA, nl04: 0.9e20 m^-2
E port has a 30 ms notches at 0.9 sec
Outer gap = 0.9 cm, delta_u = 0.3, delta_l = 0.5
Prf: 2.7 MW.
Wmax: 131 kJ
Wmax - Woh: 87 kJ
(It is 50% higher than other 1.2 MA shots in 2002 and 2003).
H factor: ~ 1.6, then downwards (radiation?)

Summary on current scan (and power scan in different current)
0.6 MA, shot 7, 8, 9
0.8 MA, shot 10, 11, 12, 13
1.0 MA, shot 14
1.2 MA, shot 15, 16, 17
Nothing wrong has been found. Although the performance
was not fantastic, the plasmas are much better than
the norm we have had in the past two years. The scaling
is close to the average level of year 96-00.

Next: 1 MA shot. Antenna comparison.

Dec 10 2003 01:44:48:770PM 1031210018 Yijun Lin shot 18:
Ip: 1. MA, nl04: 0.9e20 m^-2
Outer gap = 0.9 cm, delta_u = 0.3, delta_l = 0.5
D+E (2.2 MW, 0.6-0.9 sec) compared with J (2 MW, 1-1.3 sec)
Wmax: 113 kJ at D+E, Wmax - Woh: 73 kJ
Wmax: 94 kJ at J, Wmax - Woh: 53 kJ

Next shot: repeat, slightly lower J power to run cleaner.

Dec 10 2003 01:54:37:293PM 1031210019 Yijun Lin shot 19:
Ip: 1. MA, nl04: 0.9e20 m^-2
Outer gap = 0.9 cm, delta_u = 0.3, delta_l = 0.5
D+E (2. MW, 0.6-0.9 sec) compared with J (1.8 MW, 1.0-1.3 sec)
Wmax: 110 kJ at D+E, Wmax - Woh: 70 kJ
Wmax: 86 kJ at J, Wmax - Woh: 40 kJ

Next: switch the order of antennas.

Dec 10 2003 02:06:16:797PM 1031210020 Yijun Lin
shot 20: disrupted at 0.27 sec.

Dec 10 2003 02:38:44:170PM 1031210021 Yijun Lin shot 21:
Ip: 1. MA, nl04: 0.9e20 m^-2
Outer gap = 0.9 cm, delta_u = 0.3, delta_l = 0.5
D+E (2. MW, 1.0-1.3 sec) compared with J (2. MW, .6-.9 sec)
Wmax: 110 kJ at D+E, Wmax - Woh: 70 kJ
Wmax: 103 kJ at J, Wmax - Woh: 64 kJ

The radiation rises much faster (a factor of 1.7)
when J-port was on than D+E were on.

Next repeat.

Dec 10 2003 02:43:14:000PM 1031210023 Yijun Lin fizzle

Dec 10 2003 03:05:21:757PM 1031210024 Yijun Lin shot 24:
Ip: 1. MA, nl04: 0.9e20 m^-2, Bt = 5.2 T
Outer gap = 0.9 cm, delta_u = 0.3, delta_l = 0.5
D+E (2. MW, 1.0-1.3 sec) compared with J (2. MW, .6-.9 sec)
Wmax: 98 kJ at D+E, Wmax - Woh: 55 kJ
Wmax: 97 kJ at J, Wmax - Woh: 55 kJ

D+E seem to be identical to J in this shot. Also seen in neutron rate.
Note: Lower B field in this shot.

Next: swap the order of antennas again.

Dec 10 2003 03:21:46:647PM 1031210025 Yijun Lin hot 25:
Ip: 1. MA, nl04: 0.9e20 m^-2, Bt = 5.2 T
Outer gap = 0.9 cm, delta_u = 0.3, delta_l = 0.5
D+E (2. MW, 1.-1.3 sec) compared with J (1.8 MW, .6-.9 sec)
Wmax: 106 kJ at D+E, Wmax - Woh: 55 kJ
Wmax: 98 kJ at J, Wmax - Woh: 56 kJ

The antenna order was the same as shot 24. Similar result.
(Note J power is 10% lower than shot 24).
Next: switch the order.

Dec 10 2003 03:35:37:173PM 1031210026 Yijun Lin shot 26:
Ip: 1. MA, nl04: 0.9e20 m^-2, Bt = 5.2 T
Outer gap = 0.9 cm, delta_u = 0.3, delta_l = 0.5
D+E (2. MW, .6-.9 sec) compared with J (1.8 MW, 1-1.3 sec)
Wmax: 110 kJ at D+E
Wmax: 94 kJ at J

Summary on antenna comparison: (18, 19, 21, 24, 25, 26)
J port seems to have more impurities than D and E.
As a result, in H-mode, J-port may have an heating efficiency
about 10-15% lower than D+E.

Next: density scan. 0.6, 0.8, 1.0, 1.2 at 4 MW power.

Dec 10 2003 03:46:10:837PM 1031210027 Yijun Lin shot 27:
Ip: 1. MA, nl04: 0.67e20 m^-2, Bt = 5.4 T
Outer gap = 0.9 cm, delta_u = 0.3, delta_l = 0.5
Prf: 3.8 MW.
Wmax: 151 kJ (B field was at 5.2 T, not 5.4 as requested).
Wmax - Woh: 112 kJ.

Next: nl04 = 1.0, 5.4 T.

Dec 10 2003 03:59:18:770PM 1031210028 Yijun Lin shot 28:
Ip: 1. MA, nl04: 0.9e20 m^-2, Bt = 5.4 T
Outer gap = 0.9 cm, delta_u = 0.3, delta_l = 0.5
Prf: 3.8 MW.
Wmax: 146 kJ
Wmax - Woh: 107 kJ.

Next: nl04=1.1

Dec 10 2003 04:09:35:400PM 1031210029 Yijun Lin shot 29:
Ip: 1. MA, nl04: 1.e20 m^-2, Bt = 5.4 T
Outer gap = 0.9 cm, delta_u = 0.3, delta_l = 0.5
Prf: 3.8 MW.
Wmax: 146 kJ
Wmax - Woh: 107 kJ.

Summary on density scan:
Supposedly higher density will make more EDA like, but
it seemed not so true. Wmax are almost identical at the
last three shots (27, 28, 29). However, the performance
has definitely degraded through the day.

Next: He plasma.

Dec 10 2003 04:35:07:303PM 1031210030 Yijun Lin shot 30: Helium plasma.
Ip: 1. MA, nl04: .9e20 m^-2, Bt = 5.4 T
Outer gap = 0.9 cm, delta_u = 0.3, delta_l = 0.5
Prf: 4 MW.
Wmax: 114 kJ
Wmax - Woh: 70 kJ.

Next repeat. Added notches on E gate so that dW/dt can be calculated.

Dec 10 2003 05:18:53:423PM 1031210031 Yijun Lin shot 31: Helium plasma.
Ip: 1. MA, nl04: .9e20 m^-2, Bt = 5.4 T
Outer gap = 0.9 cm, delta_u = 0.3, delta_l = 0.5
Prf: 4 MW.
Wmax: 114 kJ
Wmax - Woh: 70 kJ.

dw/dt analysis on the notch at 1.21 sec shows
the rf absorption is about 100%. (H-mode) (according to S. Wolfe)

absorption at 1.08 sec is only about 50% (L-mode)

Dec 10 2003 04:59:11:773PM 1031210032 Yijun Lin shot 32: Helium plasma.
Ip: 1. MA, nl04: .9e20 m^-2, Bt = 5.4 T
Outer gap = 0.9 cm, delta_u = 0.3, delta_l = 0.5
Prf: 4 MW.
Wmax: 102 kJ

dw/dt analysis on the notch at 0.94 sec shows
the rf absorption is between 90 and 100%. (according to S. Wolfe)

Physics Operator Comments

Dec 10 2003 08:27:42:927AM Bill Rowan Engineering setup and run plan for Wednesday, December 10, 2003

MP#376 --- Study of the Efficiency of ICRF Minority Heating and
Investigation of the Cause of Low H-mode Plasma Performance

Session leader : Lin
Physics operator: Rowan

ECDC overnight in D2 at 2e-4 Torr.

Run begins at 09:00 and ends at 17:00.

Power systems the same as on 1031209019.

A-coils should be hooked up as on 1031204021 and the power supply should be enabled.

Gas 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)

Enable gatevalves (there will be no vacuum problems): ECE, VUV, DNB

-------------------------------------------------------------------------------
RF Setup: All 4 transmitters in Run On by 08:00
-------------------------------------------------------------------------------

Session Leader Run Plan:

This is a continuation of the experiment begun in run 1031209.

Fiducial shot for the two day experiment: (1 MA, BT~5.4 T, nl_04~0.8, standard shape)

Expext to start this second day with shot 1031209019 depending on progress on Tuesday.

Scan plasma current for fixed power (Prf ~ 4 MW)
1. for best performing shape scan plasma current (0.6,0.8,1.0,1.2 MA)
2. for poorest performing shape scan plasma current (0.6,0.8,1.0,1.2 MA)
Antenna comparison in H-mode
1. D, E, and J-port at 1 MW each, J-port at 3 MW
2. D and E at 3.0 MW, J-port at 3.0 MW
He plasma comparison
1. Fiducial discharge in He

for all discharges except the fiducial a programmed RF transition will occur at 1.2 sec
-------------------------------------------------------------------------------

Dec 10 2003 08:44:32:377AM Bill Rowan Loaded shot 1031209001. Request of SL.

Dec 10 2003 09:11:42:507AM Bill Rowan Due to problems with gas purge system, the plenums were filled manually. These are the
pressures.
Btop 5.5 psi D2
B side lower 1.1 psi Ar
C side 31.4 psi D2

Dec 10 2003 09:14:36:543AM Bill Rowan Delay in start of operations due to problems with PLC control of gas purge system.
Will attempt to repair before continuing with run.

Dec 10 2003 09:27:54:100AM 1031210001 Bill Rowan 001. This is the fiducial shot. Repeating to assure that we have the same shot as yesterday.
Late start. PLC control not yet repaired. May stop for repairs later in the run when problem
is fully diagnosed.

DNB in operation.

Dec 10 2003 09:34:45:683AM 1031210001 Bill Rowan
Next shot. Load shot 1031209020.
This will be the beginning of the power scan.

Dec 10 2003 09:51:03:450AM 1031210002 Bill Rowan 002. Plasma.

Next shot.
Increase the prefill by 2 ms from 13 ms to 15 ms.

Dec 10 2003 10:18:41:297AM 1031210004 Bill Rowan 004. Plasma.

The purge problem from earlier this morning: The Torrvac program seems to have been corrupted
and is now corrected. Note that the PhysOp log for 1031209 mentions a Torrvac problem after
shot 1031209001. The purge valve was not used after that time until this morning.

Next shot. No PCS changes.

Dec 10 2003 10:23:28:090AM 1031210005 Bill Rowan 005. Plasma.

Not using the ratiomatic except for relative changes. Pressure seems to be reading low.

Next shot. Pellet injected at 1.75 s.

Dec 10 2003 10:42:49:437AM 1031210006 Bill Rowan 006. Plasma
Pellet evident at 1.75 s. Note plasma current, nel04. bolometer

Next shot. IP=0.6MA. Beginning of a current scan.

Dec 10 2003 10:52:17:980AM 1031210007 Bill Rowan 007. Plasma
IP = 0.6 MA
Note: Fringe skip on nel04.

Dec 10 2003 10:55:47:327AM 1031210007 Bill Rowan
Next shot.
Repeat to get the density diagnostic for the RF scan.
Tend TCI before the next shot.

Dec 10 2003 11:07:31:827AM 1031210008 Bill Rowan 008. Plasma
IP = 0.6 MA
TCI worked

Dec 10 2003 11:09:46:833AM 1031210008 Bill Rowan
Next shot.
Repeat

Dec 10 2003 11:25:02:870AM 1031210009 Bill Rowan 009. Plasma

Next shot.
IP = 0.8 MA

Dec 10 2003 11:38:51:770AM 1031210010 Bill Rowan 010. Plasma

Next shot.
Repeat.

Dec 10 2003 11:54:11:727AM 1031210011 Bill Rowan 011. Plasma

Next shot.
Repeat.

Dec 10 2003 12:12:52:653PM 1031210012 Bill Rowan 012. Plasma.

Next shot.
No pcs changes.

Dec 10 2003 12:29:21:873PM 1031210013 Bill Rowan 013. Plasma

Next shot.
IP = 1.0 MA

Dec 10 2003 12:48:54:453PM 1031210014 Bill Rowan 014. Plasma

Next shot.
IP = 1.2 MA

Dec 10 2003 01:05:23:640PM 1031210015 Bill Rowan 015. Plasma

Next shot.
No PCS changes

Dec 10 2003 01:21:02:080PM 1031210016 Bill Rowan 016. Plasma

Next shot.
No PCS changes.

Dec 10 2003 01:33:42:500PM 1031210017 Bill Rowan 017. Plasma

Next shot.
IP = 1.0 MA

Dec 10 2003 01:45:52:890PM 1031210018 Bill Rowan 018. Plasma.

Next shot.
Repeat.

Dec 10 2003 01:55:23:353PM 1031210019 Bill Rowan 019. Plasma.
Disruption at 1.48s. Near the time of pellet injection.

Next shot.
No PCS changes.

Dec 10 2003 02:13:32:520PM 1031210020 Bill Rowan 020. Plasma. Very Early disruption. 0.25 s
Soft x-ray increase starting at 0.24 s
Te dropped precipitously at the edge at the same time.
Looks like something came in.
The discharge is similar to 019 prior to that time.

Next shot.
No PCS changes

Dec 10 2003 02:24:17:210PM 1031210021 Bill Rowan 021. Plasma.

Next shot.
No PCS changes

Dec 10 2003 02:37:37:910PM 1031210022 Bill Rowan 022. Fizzle.
Fields at breakdown are essentially the same as the previous shot.
Prefill pressure is slightly higher.

Next shot.
No changes made in response to fizzle
SL requested 5.2T. Changed Bfield current from -150kA to -140 kA

Dec 10 2003 02:50:31:237PM 1031210023 Bill Rowan 023. Fizzle.
Fields at breakdown are essentially the same as shot 021.

Next shot.
Reduce BR_0 by 0.2 mT

Dec 10 2003 03:01:29:693PM 1031210024 Bill Rowan 024. Plasma.

Dec 10 2003 03:02:31:550PM 1031210024 Bill Rowan
Next shot.
No PCS changes

Dec 10 2003 03:20:57:417PM 1031210025 Bill Rowan 025. Plasma.
Injection at 0.25s. Similar to shot 020.

Next shot.
Repeat.

Dec 10 2003 03:32:31:730PM 1031210026 Bill Rowan 026. Plasma.

Next shot.
Reduce nel04 to 0.6e+20.
Beginning of a density scan.

Dec 10 2003 03:45:45:227PM 1031210027 Bill Rowan 027. Plasma.
nel04 = 0.69e+19

Next shot.
Bfield changed from 5.2 T to 5.4 T
Bfield current changed from -144000 to -150000
nel04 = 1.0e+20

Dec 10 2003 03:59:06:440PM 1031210027 Bill Rowan 027. Plasma.
nel04 = 0.69e+19

Next shot.
Bfield changed from 5.2 T to 5.4 T
Bfield current changed from -144000 to -150000
nel04 = 1.0e+20

Dec 10 2003 03:59:22:817PM 1031210028 Bill Rowan 028.
BT = 5.4 T
nel04 = 0.98e+20 at 0.52 s

Next shot.
nelo4 = 1.1e+20

Dec 10 2003 04:02:44:630PM 1031210028 Bill Rowan 028.
BT = 5.4 T
nel04 = 0.98e+20 at 0.52 s

Next shot.
nelo4 = 1.1e+20

Dec 10 2003 04:07:28:190PM 1031210029 Bill Rowan 029. Plasma
nel04 = 1.08e+20

Dec 10 2003 04:12:33:220PM 1031210029 Bill Rowan 029. Plasma
nel04 = 1.08e+20

Next shot.
He plasma. Breakdown in D2 (segment 1) and run (segment 2) in Helium.
Pump out C-Side and backfill with helium to 30 psi.

Dec 10 2003 04:35:18:880PM 1031210029 Bill Rowan
Next shot.
Repeat

Dec 10 2003 04:52:49:283PM 1031210030 Bill Rowan 030. Plasma.
nel04 = 1.1e+20

Dec 10 2003 04:54:52:040PM 1031210031 Bill Rowan 031. Plasma

Next shot.
Repeat

Dec 10 2003 04:53:27:090PM 1031210032 Bill Rowan 032. Plasma.

Next shot.
Repeat

Dec 10 2003 05:04:11:457PM 1031210033 Bill Rowan 033. Plasma

Last shot.

Engineering Operator Comments

Shot Time Type Status Comment

1 09:25:33:687AM Plasma Ok

2 09:38:45:510AM Plasma Ok

3 09:52:58:660AM Plasma Ok

4 10:05:44:953AM Plasma Ok

5 10:19:15:357AM Plasma Ok

6 10:32:13:260AM Plasma Ok

7 10:45:32:647AM Plasma Ok

8 11:01:37:613AM Plasma Ok

9 11:18:16:910AM Plasma Ok

10 11:33:48:087AM Plasma Ok

11 11:46:41:833AM Plasma Ok

12 12:06:24:960PM Plasma Ok

13 12:20:43:547PM Plasma Ok

14 12:42:10:340PM Plasma Ok

15 12:54:54:820PM Plasma Ok

16 01:08:11:817PM Plasma Ok

17 01:21:50:250PM Plasma Ok

18 01:35:52:010PM Plasma Ok

19 01:48:38:020PM Plasma Ok

20 02:02:11:297PM Plasma Ok

21 02:15:20:777PM Plasma Ok

22 02:28:13:167PM Plasma Ok

23 02:40:55:633PM Plasma Ok

24 02:56:32:353PM Plasma Ok

25 03:10:29:550PM Plasma Ok

26 03:23:55:530PM Plasma Ok

27 03:37:35:150PM Plasma Ok

28 03:50:31:507PM Plasma Ok

29 04:03:58:737PM Plasma Ok

30 04:22:51:430PM Plasma Ok

31 04:36:09:643PM Plasma Ok

32 04:49:05:030PM Plasma Ok

33 05:01:46:217PM Plasma Ok

Session Leader Comments
Dec 10 2003 09:39:58:647AM	1031210001	Yijun Lin	shot 01 Load 1031209001 Fiducial shot. 1 MA. nl04 = 0.8e20 m^-2 Kappa = 1.7, right gap 0.8, delta_l = 0.56, delta_u= 0.29 RF step up 1, 2, 3, 4 MW. (requested) Good shot. RF was at 4.9 MW (Don't know why it didn't take the requested waveform) 3 H-modes at 189, 198, and 200 kJ level. It is much better than later yesterday. Next: start power scan, load shape from 1031209020.
Dec 10 2003 09:48:35:193AM	1031210002	Yijun Lin	shot 02: Load shot 1031209020 Ip: 1 MA, nl04: 0.9e20 m^-2 With D, E and J antennas (demand 0.6 MW from each transmitter) Outer gap = 0.9 cm, delta_u = 0.3, delta_l = 0.5 Prf: 2.6 MW. Wmax: 142 kJ Wmax - Woh: 101 kJ H factor: ~ 1.5 Next: Prf 3.5 MW.
Dec 10 2003 10:07:11:090AM	1031210003	Yijun Lin	Ip: 1 MA, nl04: 0.9e20 m^-2 With D, E and J antennas (demand 0.8 MW from each transmitter) E port has two 30 ms notches at 0.9 sec Outer gap = 0.9 cm, delta_u = 0.3, delta_l = 0.5 Prf: 3.6 MW. Wmax: 153 kJ (Still rising, but then J port tripped.) Wmax - Woh: 110 kJ H factor: ~ 1.4 Next: Prf 4.5 MW.
Dec 10 2003 10:15:30:807AM	1031210004	Yijun Lin	shot 04 Ip: 1 MA, nl04: 0.9e20 m^-2 With D, E and J antennas (demand 1.1 MW from each transmitter) E port has two 30 ms notches at 0.9 sec Outer gap = 0.9 cm, delta_u = 0.3, delta_l = 0.5 Prf: 4.9 MW. Wmax: 182 kJ (Still rising, but then J port faulted out.) Wmax - Woh: 140 kJ H factor: ~ 1.8 Next: repeat. to get J run longer.
Dec 10 2003 10:27:25:543AM	1031210005	Yijun Lin	shot 05 Ip: 1 MA, nl04: 0.9e20 m^-2 With D, E and J antennas (demand 1.1 MW from each transmitter) E port has two 30 ms notches at 0.9 sec Outer gap = 0.9 cm, delta_u = 0.3, delta_l = 0.5 Prf: 4.8 MW. Wmax: 189 kJ (Still rising, but then J port faulted out. J ran longer than shot 4) Wmax - Woh: 150 kJ H factor: ~ 1.7 Next: Lower J power. Same total power. repeat.
Dec 10 2003 10:39:53:980AM	1031210006	Yijun Lin	shot 06: Ip: 1 MA, nl04: 0.9e20 m^-2 With D, E and J antennas (demand 1.25 MW from D and E, 1.8 MW from J) E port has a 30 ms notches at 0.9 sec Outer gap = 0.9 cm, delta_u = 0.3, delta_l = 0.5 Prf: 4.8 MW. Wmax: 199 kJ Wmax - Woh: 159 kJ H factor: ~ 1.7 Summary on power scan (shot 2, 3, 4, 5, 6) Delta_W is close to linear relation with the rf power. The max stored energy achievable is also related to the length of steady rf power. In shot 6, we got Wmax = 200 kJ at 4.7 MW level. The scaling is no worse than that of 96-00. Next: start current scan. Prf = 4 MW. run current at 0.6, 0.8, 1.0, 1.2 MA
Dec 10 2003 11:01:25:757AM	1031210007	Yijun Lin	shot 07: Ip: 0.6 MA, nl04: 0.9e20 m^-2 With D, E and J antennas (demand 0.9 MW from each transmitter). E port has a 30 ms notches at 0.9 sec Outer gap = 0.9 cm, delta_u = 0.3, delta_l = 0.5 Prf: 2.1 MW. (J did not match well). Wmax: 61 kJ Wmax - Woh: 40 kJ H factor: ~ 1.0 (density might be wrong). Next repeat.
Dec 10 2003 11:11:24:500AM	1031210008	Yijun Lin	shot 08: Ip: 0.6 MA, nl04: 0.9e20 m^-2 With D, E and J antennas (demand 0.9 MW from each transmitter). E port has a 30 ms notches at 0.9 sec Outer gap = 0.9 cm, delta_u = 0.3, delta_l = 0.5 Prf: 2.1 MW. (J mismatched). Wmax: 55.8 kJ Wmax - Woh: 35 kJ H factor: ~ 1.0 next repeat to get better rf.
Dec 10 2003 11:26:12:147AM	1031210009	Yijun Lin	shot 09: Ip: 0.6 MA, nl04: 0.9e20 m^-2 With D, E and J antennas (demand 0.9 MW from each transmitter). E port has a 30 ms notches at 0.9 sec Outer gap = 0.9 cm, delta_u = 0.3, delta_l = 0.5 Prf: 2.1 MW. (J mismatched). Wmax: 58 kJ Wmax - Woh: 38 kJ H factor: ~ 1.0 Next: 800 kA
Dec 10 2003 11:55:48:673AM	1031210011	Yijun Lin	shot 11: Ip: 0.8 MA, nl04: 0.9e20 m^-2 E port has a 30 ms notches at 0.9 sec Outer gap = 0.9 cm, delta_u = 0.3, delta_l = 0.5 Prf: 2.9 MW. Wmax: 104 kJ Wmax - Woh: 72 kJ H factor: ~ 1.4 Next: repeat, to get 4 MW.
Dec 10 2003 12:19:02:007PM	1031210012	Yijun Lin	shot 12: Ip: 0.8 MA, nl04: 0.9e20 m^-2 E port has a 30 ms notches at 0.9 sec Outer gap = 0.9 cm, delta_u = 0.3, delta_l = 0.5 Prf: 4.1 MW. Wmax: 131 kJ, kind of steady during the entire EDA. Wmax - Woh: 97 kJ H factor: ~ 1.4 - 1.5, Long EDA. Next: More RF power.
Dec 10 2003 12:29:07:247PM	1031210013	Yijun Lin	shot 13: Ip: 0.8 MA, nl04: 0.9e20 m^-2 E port has a 30 ms notches at 0.9 sec Outer gap = 0.9 cm, delta_u = 0.3, delta_l = 0.5 Prf: 5 MW. Wmax: 169 kJ Wmax - Woh: 136 kJ H factor: ~ 1.8, Long EDA. The plasma performance seems fine. Next: 1.0 MA.
Dec 10 2003 12:47:22:020PM	1031210014	Yijun Lin	shot 14: Ip: 1.0 MA, nl04: 0.9e20 m^-2 E port has a 30 ms notches at 0.9 sec Outer gap = 0.9 cm, delta_u = 0.3, delta_l = 0.5 Prf: 4.8 MW. Wmax: 193 kJ Wmax - Woh: 153 kJ H factor: ~ 1.6, 3 H-modes Next: 1.2 MA, needs A coil.
Dec 10 2003 01:03:34:897PM	1031210015	Yijun Lin	shot 15: Ip: 1.2 MA, nl04: 0.9e20 m^-2 E port has a 30 ms notches at 0.9 sec Outer gap = 0.9 cm, delta_u = 0.3, delta_l = 0.5 Prf: 4.8 MW. Wmax: 203 kJ Wmax - Woh: 158 kJ (It is 60% higher than other 1.2 MA shots in 2002 and 2003). H factor: ~ 1.6, then downwards (radiation?) Next: lower Prf.
Dec 10 2003 01:16:32:020PM	1031210016	Yijun Lin	shot 16: Ip: 1.2 MA, nl04: 0.9e20 m^-2 E port has a 30 ms notches at 0.9 sec Outer gap = 0.9 cm, delta_u = 0.3, delta_l = 0.5 Prf: 3.8 MW. Wmax: 171 kJ Wmax - Woh: 135 kJ (It is 50% higher than other 1.2 MA shots in 2002 and 2003). H factor: ~ 1.6, then downwards (radiation?)
Dec 10 2003 01:35:43:900PM	1031210017	Yijun Lin	shot 17: Ip: 1.2 MA, nl04: 0.9e20 m^-2 E port has a 30 ms notches at 0.9 sec Outer gap = 0.9 cm, delta_u = 0.3, delta_l = 0.5 Prf: 2.7 MW. Wmax: 131 kJ Wmax - Woh: 87 kJ (It is 50% higher than other 1.2 MA shots in 2002 and 2003). H factor: ~ 1.6, then downwards (radiation?) Summary on current scan (and power scan in different current) 0.6 MA, shot 7, 8, 9 0.8 MA, shot 10, 11, 12, 13 1.0 MA, shot 14 1.2 MA, shot 15, 16, 17 Nothing wrong has been found. Although the performance was not fantastic, the plasmas are much better than the norm we have had in the past two years. The scaling is close to the average level of year 96-00. Next: 1 MA shot. Antenna comparison.
Dec 10 2003 01:44:48:770PM	1031210018	Yijun Lin	shot 18: Ip: 1. MA, nl04: 0.9e20 m^-2 Outer gap = 0.9 cm, delta_u = 0.3, delta_l = 0.5 D+E (2.2 MW, 0.6-0.9 sec) compared with J (2 MW, 1-1.3 sec) Wmax: 113 kJ at D+E, Wmax - Woh: 73 kJ Wmax: 94 kJ at J, Wmax - Woh: 53 kJ Next shot: repeat, slightly lower J power to run cleaner.
Dec 10 2003 01:54:37:293PM	1031210019	Yijun Lin	shot 19: Ip: 1. MA, nl04: 0.9e20 m^-2 Outer gap = 0.9 cm, delta_u = 0.3, delta_l = 0.5 D+E (2. MW, 0.6-0.9 sec) compared with J (1.8 MW, 1.0-1.3 sec) Wmax: 110 kJ at D+E, Wmax - Woh: 70 kJ Wmax: 86 kJ at J, Wmax - Woh: 40 kJ Next: switch the order of antennas.
Dec 10 2003 02:06:16:797PM	1031210020	Yijun Lin	shot 20: disrupted at 0.27 sec.
Dec 10 2003 02:38:44:170PM	1031210021	Yijun Lin	shot 21: Ip: 1. MA, nl04: 0.9e20 m^-2 Outer gap = 0.9 cm, delta_u = 0.3, delta_l = 0.5 D+E (2. MW, 1.0-1.3 sec) compared with J (2. MW, .6-.9 sec) Wmax: 110 kJ at D+E, Wmax - Woh: 70 kJ Wmax: 103 kJ at J, Wmax - Woh: 64 kJ The radiation rises much faster (a factor of 1.7) when J-port was on than D+E were on. Next repeat.
Dec 10 2003 02:43:14:000PM	1031210023	Yijun Lin	fizzle
Dec 10 2003 03:05:21:757PM	1031210024	Yijun Lin	shot 24: Ip: 1. MA, nl04: 0.9e20 m^-2, Bt = 5.2 T Outer gap = 0.9 cm, delta_u = 0.3, delta_l = 0.5 D+E (2. MW, 1.0-1.3 sec) compared with J (2. MW, .6-.9 sec) Wmax: 98 kJ at D+E, Wmax - Woh: 55 kJ Wmax: 97 kJ at J, Wmax - Woh: 55 kJ D+E seem to be identical to J in this shot. Also seen in neutron rate. Note: Lower B field in this shot. Next: swap the order of antennas again.
Dec 10 2003 03:21:46:647PM	1031210025	Yijun Lin	hot 25: Ip: 1. MA, nl04: 0.9e20 m^-2, Bt = 5.2 T Outer gap = 0.9 cm, delta_u = 0.3, delta_l = 0.5 D+E (2. MW, 1.-1.3 sec) compared with J (1.8 MW, .6-.9 sec) Wmax: 106 kJ at D+E, Wmax - Woh: 55 kJ Wmax: 98 kJ at J, Wmax - Woh: 56 kJ The antenna order was the same as shot 24. Similar result. (Note J power is 10% lower than shot 24). Next: switch the order.
Dec 10 2003 03:35:37:173PM	1031210026	Yijun Lin	shot 26: Ip: 1. MA, nl04: 0.9e20 m^-2, Bt = 5.2 T Outer gap = 0.9 cm, delta_u = 0.3, delta_l = 0.5 D+E (2. MW, .6-.9 sec) compared with J (1.8 MW, 1-1.3 sec) Wmax: 110 kJ at D+E Wmax: 94 kJ at J Summary on antenna comparison: (18, 19, 21, 24, 25, 26) J port seems to have more impurities than D and E. As a result, in H-mode, J-port may have an heating efficiency about 10-15% lower than D+E. Next: density scan. 0.6, 0.8, 1.0, 1.2 at 4 MW power.
Dec 10 2003 03:46:10:837PM	1031210027	Yijun Lin	shot 27: Ip: 1. MA, nl04: 0.67e20 m^-2, Bt = 5.4 T Outer gap = 0.9 cm, delta_u = 0.3, delta_l = 0.5 Prf: 3.8 MW. Wmax: 151 kJ (B field was at 5.2 T, not 5.4 as requested). Wmax - Woh: 112 kJ. Next: nl04 = 1.0, 5.4 T.
Dec 10 2003 03:59:18:770PM	1031210028	Yijun Lin	shot 28: Ip: 1. MA, nl04: 0.9e20 m^-2, Bt = 5.4 T Outer gap = 0.9 cm, delta_u = 0.3, delta_l = 0.5 Prf: 3.8 MW. Wmax: 146 kJ Wmax - Woh: 107 kJ. Next: nl04=1.1
Dec 10 2003 04:09:35:400PM	1031210029	Yijun Lin	shot 29: Ip: 1. MA, nl04: 1.e20 m^-2, Bt = 5.4 T Outer gap = 0.9 cm, delta_u = 0.3, delta_l = 0.5 Prf: 3.8 MW. Wmax: 146 kJ Wmax - Woh: 107 kJ. Summary on density scan: Supposedly higher density will make more EDA like, but it seemed not so true. Wmax are almost identical at the last three shots (27, 28, 29). However, the performance has definitely degraded through the day. Next: He plasma.
Dec 10 2003 04:35:07:303PM	1031210030	Yijun Lin	shot 30: Helium plasma. Ip: 1. MA, nl04: .9e20 m^-2, Bt = 5.4 T Outer gap = 0.9 cm, delta_u = 0.3, delta_l = 0.5 Prf: 4 MW. Wmax: 114 kJ Wmax - Woh: 70 kJ. Next repeat. Added notches on E gate so that dW/dt can be calculated.
Dec 10 2003 05:18:53:423PM	1031210031	Yijun Lin	shot 31: Helium plasma. Ip: 1. MA, nl04: .9e20 m^-2, Bt = 5.4 T Outer gap = 0.9 cm, delta_u = 0.3, delta_l = 0.5 Prf: 4 MW. Wmax: 114 kJ Wmax - Woh: 70 kJ. dw/dt analysis on the notch at 1.21 sec shows the rf absorption is about 100%. (H-mode) (according to S. Wolfe) absorption at 1.08 sec is only about 50% (L-mode)
Dec 10 2003 04:59:11:773PM	1031210032	Yijun Lin	shot 32: Helium plasma. Ip: 1. MA, nl04: .9e20 m^-2, Bt = 5.4 T Outer gap = 0.9 cm, delta_u = 0.3, delta_l = 0.5 Prf: 4 MW. Wmax: 102 kJ dw/dt analysis on the notch at 0.94 sec shows the rf absorption is between 90 and 100%. (according to S. Wolfe)

Physics Operator Comments
Dec 10 2003 08:27:42:927AM		Bill Rowan	Engineering setup and run plan for Wednesday, December 10, 2003 MP#376 --- Study of the Efficiency of ICRF Minority Heating and Investigation of the Cause of Low H-mode Plasma Performance Session leader : Lin Physics operator: Rowan ECDC overnight in D2 at 2e-4 Torr. Run begins at 09:00 and ends at 17:00. Power systems the same as on 1031209019. A-coils should be hooked up as on 1031204021 and the power supply should be enabled. Gas 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) Enable gatevalves (there will be no vacuum problems): ECE, VUV, DNB ------------------------------------------------------------------------------- RF Setup: All 4 transmitters in Run On by 08:00 ------------------------------------------------------------------------------- Session Leader Run Plan: This is a continuation of the experiment begun in run 1031209. Fiducial shot for the two day experiment: (1 MA, BT~5.4 T, nl_04~0.8, standard shape) Expext to start this second day with shot 1031209019 depending on progress on Tuesday. Scan plasma current for fixed power (Prf ~ 4 MW) 1. for best performing shape scan plasma current (0.6,0.8,1.0,1.2 MA) 2. for poorest performing shape scan plasma current (0.6,0.8,1.0,1.2 MA) Antenna comparison in H-mode 1. D, E, and J-port at 1 MW each, J-port at 3 MW 2. D and E at 3.0 MW, J-port at 3.0 MW He plasma comparison 1. Fiducial discharge in He for all discharges except the fiducial a programmed RF transition will occur at 1.2 sec -------------------------------------------------------------------------------
Dec 10 2003 08:44:32:377AM		Bill Rowan	Loaded shot 1031209001. Request of SL.
Dec 10 2003 09:11:42:507AM		Bill Rowan	Due to problems with gas purge system, the plenums were filled manually. These are the pressures. Btop 5.5 psi D2 B side lower 1.1 psi Ar C side 31.4 psi D2
Dec 10 2003 09:14:36:543AM		Bill Rowan	Delay in start of operations due to problems with PLC control of gas purge system. Will attempt to repair before continuing with run.
Dec 10 2003 09:27:54:100AM	1031210001	Bill Rowan	001. This is the fiducial shot. Repeating to assure that we have the same shot as yesterday. Late start. PLC control not yet repaired. May stop for repairs later in the run when problem is fully diagnosed. DNB in operation.
Dec 10 2003 09:34:45:683AM	1031210001	Bill Rowan	Next shot. Load shot 1031209020. This will be the beginning of the power scan.
Dec 10 2003 09:51:03:450AM	1031210002	Bill Rowan	002. Plasma. Next shot. Increase the prefill by 2 ms from 13 ms to 15 ms.
Dec 10 2003 10:18:41:297AM	1031210004	Bill Rowan	004. Plasma. The purge problem from earlier this morning: The Torrvac program seems to have been corrupted and is now corrected. Note that the PhysOp log for 1031209 mentions a Torrvac problem after shot 1031209001. The purge valve was not used after that time until this morning. Next shot. No PCS changes.
Dec 10 2003 10:23:28:090AM	1031210005	Bill Rowan	005. Plasma. Not using the ratiomatic except for relative changes. Pressure seems to be reading low. Next shot. Pellet injected at 1.75 s.
Dec 10 2003 10:42:49:437AM	1031210006	Bill Rowan	006. Plasma Pellet evident at 1.75 s. Note plasma current, nel04. bolometer Next shot. IP=0.6MA. Beginning of a current scan.
Dec 10 2003 10:52:17:980AM	1031210007	Bill Rowan	007. Plasma IP = 0.6 MA Note: Fringe skip on nel04.
Dec 10 2003 10:55:47:327AM	1031210007	Bill Rowan	Next shot. Repeat to get the density diagnostic for the RF scan. Tend TCI before the next shot.
Dec 10 2003 11:07:31:827AM	1031210008	Bill Rowan	008. Plasma IP = 0.6 MA TCI worked
Dec 10 2003 11:09:46:833AM	1031210008	Bill Rowan	Next shot. Repeat
Dec 10 2003 11:25:02:870AM	1031210009	Bill Rowan	009. Plasma Next shot. IP = 0.8 MA
Dec 10 2003 11:38:51:770AM	1031210010	Bill Rowan	010. Plasma Next shot. Repeat.
Dec 10 2003 11:54:11:727AM	1031210011	Bill Rowan	011. Plasma Next shot. Repeat.
Dec 10 2003 12:12:52:653PM	1031210012	Bill Rowan	012. Plasma. Next shot. No pcs changes.
Dec 10 2003 12:29:21:873PM	1031210013	Bill Rowan	013. Plasma Next shot. IP = 1.0 MA
Dec 10 2003 12:48:54:453PM	1031210014	Bill Rowan	014. Plasma Next shot. IP = 1.2 MA
Dec 10 2003 01:05:23:640PM	1031210015	Bill Rowan	015. Plasma Next shot. No PCS changes
Dec 10 2003 01:21:02:080PM	1031210016	Bill Rowan	016. Plasma Next shot. No PCS changes.
Dec 10 2003 01:33:42:500PM	1031210017	Bill Rowan	017. Plasma Next shot. IP = 1.0 MA
Dec 10 2003 01:45:52:890PM	1031210018	Bill Rowan	018. Plasma. Next shot. Repeat.
Dec 10 2003 01:55:23:353PM	1031210019	Bill Rowan	019. Plasma. Disruption at 1.48s. Near the time of pellet injection. Next shot. No PCS changes.
Dec 10 2003 02:13:32:520PM	1031210020	Bill Rowan	020. Plasma. Very Early disruption. 0.25 s Soft x-ray increase starting at 0.24 s Te dropped precipitously at the edge at the same time. Looks like something came in. The discharge is similar to 019 prior to that time. Next shot. No PCS changes
Dec 10 2003 02:24:17:210PM	1031210021	Bill Rowan	021. Plasma. Next shot. No PCS changes
Dec 10 2003 02:37:37:910PM	1031210022	Bill Rowan	022. Fizzle. Fields at breakdown are essentially the same as the previous shot. Prefill pressure is slightly higher. Next shot. No changes made in response to fizzle SL requested 5.2T. Changed Bfield current from -150kA to -140 kA
Dec 10 2003 02:50:31:237PM	1031210023	Bill Rowan	023. Fizzle. Fields at breakdown are essentially the same as shot 021. Next shot. Reduce BR_0 by 0.2 mT
Dec 10 2003 03:01:29:693PM	1031210024	Bill Rowan	024. Plasma.
Dec 10 2003 03:02:31:550PM	1031210024	Bill Rowan	Next shot. No PCS changes
Dec 10 2003 03:20:57:417PM	1031210025	Bill Rowan	025. Plasma. Injection at 0.25s. Similar to shot 020. Next shot. Repeat.
Dec 10 2003 03:32:31:730PM	1031210026	Bill Rowan	026. Plasma. Next shot. Reduce nel04 to 0.6e+20. Beginning of a density scan.
Dec 10 2003 03:45:45:227PM	1031210027	Bill Rowan	027. Plasma. nel04 = 0.69e+19 Next shot. Bfield changed from 5.2 T to 5.4 T Bfield current changed from -144000 to -150000 nel04 = 1.0e+20
Dec 10 2003 03:59:06:440PM	1031210027	Bill Rowan	027. Plasma. nel04 = 0.69e+19 Next shot. Bfield changed from 5.2 T to 5.4 T Bfield current changed from -144000 to -150000 nel04 = 1.0e+20
Dec 10 2003 03:59:22:817PM	1031210028	Bill Rowan	028. BT = 5.4 T nel04 = 0.98e+20 at 0.52 s Next shot. nelo4 = 1.1e+20
Dec 10 2003 04:02:44:630PM	1031210028	Bill Rowan	028. BT = 5.4 T nel04 = 0.98e+20 at 0.52 s Next shot. nelo4 = 1.1e+20
Dec 10 2003 04:07:28:190PM	1031210029	Bill Rowan	029. Plasma nel04 = 1.08e+20
Dec 10 2003 04:12:33:220PM	1031210029	Bill Rowan	029. Plasma nel04 = 1.08e+20 Next shot. He plasma. Breakdown in D2 (segment 1) and run (segment 2) in Helium. Pump out C-Side and backfill with helium to 30 psi.
Dec 10 2003 04:35:18:880PM	1031210029	Bill Rowan	Next shot. Repeat
Dec 10 2003 04:52:49:283PM	1031210030	Bill Rowan	030. Plasma. nel04 = 1.1e+20
Dec 10 2003 04:54:52:040PM	1031210031	Bill Rowan	031. Plasma Next shot. Repeat
Dec 10 2003 04:53:27:090PM	1031210032	Bill Rowan	032. Plasma. Next shot. Repeat
Dec 10 2003 05:04:11:457PM	1031210033	Bill Rowan	033. Plasma Last shot.

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	09:25:33:687AM	Plasma	Ok
2	09:38:45:510AM	Plasma	Ok
3	09:52:58:660AM	Plasma	Ok
4	10:05:44:953AM	Plasma	Ok
5	10:19:15:357AM	Plasma	Ok
6	10:32:13:260AM	Plasma	Ok
7	10:45:32:647AM	Plasma	Ok
8	11:01:37:613AM	Plasma	Ok
9	11:18:16:910AM	Plasma	Ok
10	11:33:48:087AM	Plasma	Ok
11	11:46:41:833AM	Plasma	Ok
12	12:06:24:960PM	Plasma	Ok
13	12:20:43:547PM	Plasma	Ok
14	12:42:10:340PM	Plasma	Ok
15	12:54:54:820PM	Plasma	Ok
16	01:08:11:817PM	Plasma	Ok
17	01:21:50:250PM	Plasma	Ok
18	01:35:52:010PM	Plasma	Ok
19	01:48:38:020PM	Plasma	Ok
20	02:02:11:297PM	Plasma	Ok
21	02:15:20:777PM	Plasma	Ok
22	02:28:13:167PM	Plasma	Ok
23	02:40:55:633PM	Plasma	Ok
24	02:56:32:353PM	Plasma	Ok
25	03:10:29:550PM	Plasma	Ok
26	03:23:55:530PM	Plasma	Ok
27	03:37:35:150PM	Plasma	Ok
28	03:50:31:507PM	Plasma	Ok
29	04:03:58:737PM	Plasma	Ok
30	04:22:51:430PM	Plasma	Ok
31	04:36:09:643PM	Plasma	Ok
32	04:49:05:030PM	Plasma	Ok
33	05:01:46:217PM	Plasma	Ok