Alcator C-Mod Run 1040129 Information

Miniproposals

Miniproposal: 360

Date Filed: 10/6/2003

Title: Initial test of a load tolerant configuration on E-Antenna

First Author: Alexandre Parisot

Session Leader: Alexandre Parisot (shots 1-32)

Operators
Session leader(s):	Alexandre Parisot
Physics operator(s):	Bill Rowan
Engineering operator(s):	Unknown

Engineering Operator Run Comment
MP# 360 Initial test of load tolerant configuration on E-Antenna/Parisot

Session Leader Plans

Physics Operators Plans

Session Leader Summaries

Entered: Jul 7 2004 03:49:02:493PM

Author: Alexandre Parisot

Run summary:
------------

This was an instructive day, if not succesful. After a few discharges, it
became clear we would not achieve the expected load tolerant behaviour on
E-antenna and we went on investigating why and studying the system, with
some success.

The loading impedance at the antenna ports changed significantly as we made
the stub lengths asymmetric, most notably in phase. This violates a main
assumption of the load tolerant configuration, and prevents the system from
working as expected, as seen both experimentally and from the model.
Current measurements on the straps suggest the changes are due to unequal
power splitting at the conjugate tee in the asymmetric setup and to a high
level of coupling between the straps, both poloidally (same strap, between
top and bottom) and toroidally (two adjacent straps). The coupling seems to
be higher in presence of the plasma compared to the vacuum case, but its
dependence on plasma parameters (Ip, gap, density) is found to be rather
small.

This evaluation implies that a proper modelisation of a load tolerant
system must include a model of the coupling between straps in plasma,
through a scattering matrix. This matrix should be measured, in absence
of a computer code able to predict it - this then be very helpful in
developping and benchmarking such code. We will work on determining an
experimental setup for doing this.

Even with strong current imbalance, we did not see any obvious signs of
impurity production from E-antenna. We compared the impurity levels with
D (reference - standard dipole configuration) on and then E on at the
same power, up to 1 MW. The levels were comparable.

--------------------
Run Plan for 1040129
MP 360 : Initial test of a load tolerant configuration on E-Antenna
PO: Rowan
SL: Parisot
RF: Lin/Wukitch

Purpose:
========
We want to perform an initial test of a possible load tolerant configuration
on the E-Port ICRF transmission line system. The load tolerant (LT) system
is meant to reduce the loading variations and allow the system to operate in
both L-mode and H-mode without the need of retuning the phase shifter/stub
tuner (PS-ST) matching system. It can also be used as a prematching system
by reducing the voltage in these matching components.

Plan:
=====
We have two objectives:
1] Test the ideal transmission line model
2] Assess the performance of the LT system for normal ICRF operations. The
main criteria will be the extent of the loading variations at DC1 with fixed PS/ST
lengths.

Shot sequence:
==============

1ST PART:
Start with a fiducial discharge (1040106033) and:
D: 500 kW [0.6-0.8s] max [1.2-1.4s]
E: 500 kW [1.0-1.4s]
Establish symmetric configuration of the LT system (3 shots).
Modify the length of the stubs to realize the load tolerant
configuration (asymmetric) and optimize the system (10 shots).

2ND PART:
Increase power level for D and E by 200 kW increments, from 500kW.
(7 shots)
Once power limits are reached, repeat to collect data on limiting phenomena.
(2 shots)

3RD PART: (10 shots)
Depending on the limiting phenomena, vary the plasma conditions to obtain
large loading variations:
- Increase plasma current to 1.2MA
- Density scan
- Gap scan

Comparing D and E, we will be looking at heating efficiency and impurity
levels.

----------------------------------------------------------------------------
1040129001 parisot SESSION_LEADER Jan 29 2004 9:18:14:823AM
. . . . . . . . . . . . . . . . . . . .
Fiducial discharge (1040106033 loaded). 1MA 5.4T nl04 = 1.e20 m^-2
D: 500 kW [0.6-0.8s] max [1.2-1.4s]
E: 500 kW [1.0-1.4s]
Stubs: 1:18 2:18 3:18 4:18 (turns from shorter position)

Result:
Plasma. E did not run (mismatched as expected)

Next:
Repeat. Tune E-Antenna.
----------------------------------------------------------------------------
1040129002 parisot SESSION_LEADER Jan 29 2004 9:36:17:253AM
. . . . . . . . . . . . . . . . . . . .
Fiducial discharge (1040106033 loaded). 1MA 5.4T nl04 = 1.e20 m^-2
D: 500 kW [0.6-0.8s] max [1.2-1.4s]
E: 500 kW [1.0-1.4s]
Stubs: 1:18 2:18 3:18 4:18

Result:
Plasma. E did not go, still mismatched, but better.

Next:
Repeat. Keep tuning E.
----------------------------------------------------------------------------
1040129004 parisot SESSION_LEADER Jan 29 2004 10:11:14:443AM
. . . . . . . . . . . . . . . . . . . .
Fiducial discharge (1040106033 loaded). 1MA 5.4T nl04 = 1.e20 m^-2
D: 500 kW [0.6-0.8s] max [1.2-1.4s]
E: 500 kW [1.0-1.4s]
Stubs: 1:18 2:18 3:18 4:18

Result:
Plasma. E did run.
The reflection coefficients at E-DC2, DC3 and DC4 are larger than expected.

Next:
Repeat.
----------------------------------------------------------------------------
1040129005 parisot SESSION_LEADER Jan 29 2004 10:33:11:980AM
. . . . . . . . . . . . . . . . . . . .
Fiducial discharge (1040106033 loaded). 1MA 5.4T nl04 = 1.e20 m^-2
D: 500 kW [0.6-0.8s] max [1.2-1.4s]
E: 500 kW [1.0-1.4s]
Stubs: 1:18 2:18 3:18 4:18

Result:
Plasma. E did run.

Next:
Set asymmetric configuration
1:2 2:2 3:33 4:33 turns.
----------------------------------------------------------------------------
1040129006 parisot SESSION_LEADER Jan 29 2004 10:48:42:600AM
. . . . . . . . . . . . . . . . . . . .
Fiducial discharge (1040106033 loaded). 1MA 5.4T nl04 = 1.e20 m^-2
D: 500 kW [0.6-0.8s] max [1.2-1.4s]
E: 500 kW [1.0-1.4s]
Stubs: 1:2 2:2 3:33 4:33

Result:
Plasma.
E did run with the same PS/ST settings.
The reflection coefficients at DC2,DC3,DC4 did not change that much, the currents are asymmetric on
the straps.

Next:
Repeat

----------------------------------------------------------------------------
1040129008 parisot SESSION_LEADER Jan 29 2004 11:13:23:496AM
. . . . . . . . . . . . . . . . . . . .
Fiducial discharge (1040106033 loaded). 1MA 5.4T nl04 = 1.e20 m^-2
D: 500 kW [0.6-0.8s] max [1.2-1.4s]
E: 500 kW [1.0-1.4s]
Stubs: 1:2 2:2 3:33 4:33

Result:
Plasma. No change.
It seems the phase at the 4 antenna ports changes at well with the asymmetry.
Preliminary analysis with the model suggests this is compatible with no change in the reflection
coefficient. We will scan the lengths of the stubs, going further back toward symmetry and over to
gather data.

Next:
Stub settings 1:0 2:0 3:40 4:40

----------------------------------------------------------------------------
1040129009 parisot SESSION_LEADER Jan 29 2004 11:32:04:570AM
. . . . . . . . . . . . . . . . . . . .
Fiducial discharge (1040106033 loaded). 1MA 5.4T nl04 = 1.e20 m^-2
D: 500 kW [0.6-0.8s] max [1.2-1.4s]
E: 500 kW [1.0-1.4s]
Stubs: 1:0 2:0 3:40 4:40

Result:
Plasma. Same story.
We will continue the scan.

Next:
Stub settings 1:10 2:10 3:25 4:25

----------------------------------------------------------------------------
1040129010 parisot SESSION_LEADER Jan 29 2004 11:44:32:410AM
. . . . . . . . . . . . . . . . . . . .
Fiducial discharge (1040106033 loaded). 1MA 5.4T nl04 = 1.e20 m^-2
D: 500 kW [0.6-0.8s] max [1.2-1.4s]
E: 500 kW [1.0-1.4s]
Stubs: 1:10 2:10 3:25 4:25

Result:
Plasma.

Next:
Stub settings 1:25 2:25 3:10 4:10

----------------------------------------------------------------------------
1040129012 parisot SESSION_LEADER Jan 29 2004 12:17:14:426PM
. . . . . . . . . . . . . . . . . . . .
Fiducial discharge (1040106033 loaded). 1MA 5.4T nl04 = 1.e20 m^-2
D: 500 kW [0.6-0.8s] max [1.2-1.4s]
E: 500 kW [1.0-1.4s]
Stubs: 1:25 2:25 3:10 4:10

Result:
Plasma.

Next:
Stub settings 1:33 2:33 3:2 4:2

----------------------------------------------------------------------------
1040129013 parisot SESSION_LEADER Jan 29 2004 12:23:48:283PM
. . . . . . . . . . . . . . . . . . . .
Fiducial discharge (1040106033 loaded). 1MA 5.4T nl04 = 1.e20 m^-2
D: 500 kW [0.6-0.8s] max [1.2-1.4s]
E: 500 kW [1.0-1.4s]
Stubs: 1:33 2:33 3:2 4:2

Result:
Plasma.

Next:
Stub settings 1:40 2:40 3:0 4:0

----------------------------------------------------------------------------
1040129015 parisot SESSION_LEADER Jan 29 2004 12:49:51:900PM
. . . . . . . . . . . . . . . . . . . .
Fiducial discharge (1040106033 loaded). 1MA 5.4T nl04 = 1.e20 m^-2
D: 500 kW [0.6-0.8s] max [1.2-1.4s]
E: 500 kW [1.0-1.4s]
Stubs: 1:40 2:40 3:0 4:0

Result:
Plasma. From this settings scan, we have a good picture of the limiting phenomena
in the systems. We are going to raise power to look for potential impurity production
in the 2 most asymmetric configurations.

Next:
Raise power from D and E by 250kW increments.

----------------------------------------------------------------------------
1040129016 parisot SESSION_LEADER Jan 29 2004 1:04:22:126PM
. . . . . . . . . . . . . . . . . . . .
Fiducial discharge (1040106033 loaded). 1MA 5.4T nl04 = 1.e20 m^-2
D: 750 kW [0.6-0.8s] max [1.2-1.4s]
E: 750 kW [1.0-1.4s]
Stubs: 1:40 2:40 3:0 4:0

Result:
Plasma. E is not running well when D is on.

Next:
Raise power from E to 1 MW. Leave D off while E is on.

----------------------------------------------------------------------------
1040129018 parisot SESSION_LEADER Jan 29 2004 1:34:58:426PM
. . . . . . . . . . . . . . . . . . . .
Fiducial discharge. 1MA 5.4T nl04 = 1.e20 m^-2
D: 1MW [0.6-0.8s]
E: 1MW [1.0-1.4s]
Stubs: 1:40 2:40 3:0 4:0

Result:
Plasma. E has many faults.

Next:
Reduce plasma current to 0.6 MA, this should reduce the coupling.
Reduce the power from E to 700 kW to prevent faults.

----------------------------------------------------------------------------
1040129020 parisot SESSION_LEADER Jan 29 2004 2:07:16:133PM
. . . . . . . . . . . . . . . . . . . .
0.6MA 5.4T nl04 = 1.e20 m^-2
D: 700kW [0.6-0.8s]
E: 700kW [1.0-1.4s]
Stubs: 1:40 2:40 3:0 4:0

Result:
Plasma. The reflection coefficient at DC2,DC3,DC4 was slightly reduced.
We will get another value of the plasma current to study this.

Next
Go to 0.8 MA.

----------------------------------------------------------------------------
1040129021 parisot SESSION_LEADER Jan 29 2004 2:24:00:800PM
. . . . . . . . . . . . . . . . . . . .
0.8MA 5.4T nl04 = 1.e20 m^-2
D: 700kW [0.6-0.8s]
E: 700kW [1.0-1.4s]
Stubs: 1:40 2:40 3:0 4:0

Result:
Plasma. The third value of current confirms the trend.
Data suggests the power limits on E come from power imbalance, and not voltage
limits on the main line. As the reflection coefficients are close in both setups, we will
go the symmetric configuration and provide a comparison with shot 18.

Next
Go back to 1.0 MA. and 1 MW from D and E.

----------------------------------------------------------------------------
1040129022 parisot SESSION_LEADER Jan 29 2004 2:41:27:620PM
. . . . . . . . . . . . . . . . . . . .
1.0MA 5.4T nl04 = 1.e20 m^-2
D: 700kW [0.6-0.8s]
E: 700kW [1.0-1.4s]
Stubs: 1:18 2:18 3:18 4:18

Result:
Plasma. Still faulting in the symmetric configuration.

Next
Go to 1:0 2:40 3:40 4:0 (asymmetric reversed)

----------------------------------------------------------------------------
1040129023 parisot SESSION_LEADER Jan 29 2004 2:50:27:446PM
. . . . . . . . . . . . . . . . . . . .
1.0MA 5.4T nl04 = 1.e20 m^-2
D: 1MW [0.6-0.8s]
E: 1MW [1.0-1.4s]
Stubs: 1:0 2:40 3:40 4:0

Result:
Plasma. Did not provide a good D and E comparison in L/H mode.

Next:
Repeat.

----------------------------------------------------------------------------
1040129024 parisot SESSION_LEADER Jan 29 2004 3:13:28:250PM
. . . . . . . . . . . . . . . . . . . .
1.0MA 5.4T nl04 = 1.e20 m^-2
D: 1MW [0.6-0.8s]
E: 1MW [1.0-1.4s]
Stubs: 1:0 2:40 3:40 4:0

Result:
Plasma. Good data.

Next:
Go to 1:40 2:0 3:0 4:40

----------------------------------------------------------------------------
1040129025 parisot SESSION_LEADER Jan 29 2004 3:23:58:700PM
. . . . . . . . . . . . . . . . . . . .
1.0MA 5.4T nl04 = 1.e20 m^-2
D: 1MW [0.6-0.8s]
E: 1MW [1.0-1.4s]
Stubs: 1:40 2:0 3:0 4:40

Result:
Plasma. The last two shots suggest high level of coupling toroidally between the two straps.
We will try a semi-asymmetric configuration to investigate this.

Next:
Go to 1:40 2:18 3:0 4:18

----------------------------------------------------------------------------
1040129026 parisot SESSION_LEADER Jan 29 2004 5:05:19:566PM
. . . . . . . . . . . . . . . . . . . .
1.0MA 5.4T nl04 = 1.e20 m^-2
D: 1MW [0.6-0.8s]
E: 1MW [1.0-1.4s]
Stubs: 1:40 2:18 3:0 4:18

Result:
Plasma. Data confirms a high level of coupling toroidally between the two straps.
We will investigate the effect of the gap on this coupling level.

Next:
Increase the gap to 2cm.

----------------------------------------------------------------------------
1040129027 parisot SESSION_LEADER Jan 29 2004 4:47:58:856PM
. . . . . . . . . . . . . . . . . . . .
1.0MA 5.4T nl04 = 1.e20 m^-2 gap 2cm
D: 1MW [0.6-0.8s]
E: 1MW [1.0-1.4s]
Stubs: 1:40 2:18 3:0 4:18

Result:
Plasma. This did not change the coupling significantly.

Next:
Decrease the gap to 0.5cm

----------------------------------------------------------------------------
1040129029 parisot SESSION_LEADER Jan 29 2004 4:48:15:530PM
. . . . . . . . . . . . . . . . . . . .
1.0MA 5.4T nl04 = 1.e20 m^-2 gap 0.7cm
D: 1MW [0.6-0.8s]
E: 1MW [1.0-1.4s]
Stubs: 1:40 2:18 3:0 4:18

Result:
Plasma. Again, no significant changes in the coupling.
As suggested by the cut-off model, we can decrease the coupling by
going low density, large gap, low current.

Next:
Target density to 0.6e20 m^-2
Gap 2cm
Plasma current 0.6 MA

----------------------------------------------------------------------------
1040129031 parisot SESSION_LEADER Jan 29 2004 4:49:30:623PM
. . . . . . . . . . . . . . . . . . . .
.6MA 5.4T nl04 = 0.6e20 m^-2 gap 2cm
D: 1MW [0.6-0.8s]
E: 1MW [1.0-1.4s]
Stubs: 1:40 2:18 3:0 4:18

Result:
Plasma. The coupling changed only slightly.
We'll go even lower density.

Next:
Target density to 0.3e20 m^-2

----------------------------------------------------------------------------
1040129032 parisot SESSION_LEADER Jan 29 2004 5:10:27:210PM
. . . . . . . . . . . . . . . . . . . .
.6MA 5.4T nl04 = 0.4e20 m^-2 gap 2cm
D: 1MW [0.6-0.8s]
E: 1MW [1.0-1.4s]
Stubs: 1:40 2:18 3:0 4:18

Result:
Plasma. Again, the coupling changed only slightly.

End of run

----------------------------------------------------------------------------

Stub settings:
Length (wavelengths at 80MHz) - turns
0.06 - 2.8 turns
0.065 - 6.6 turns
0.07 - 10.4 turns
0.075 - 14.2 turns
0.08 - 18.0 turns
0.085 - 21.7 turns
0.09 - 25.6 turns
0.095 - 29.4 turns
0.10 - 33.1 turns
0.105 - 36.9 turns
0.11 - 40.7 turns
0.115 - 44.5 turns
0.12 - 48.3 turns
0.125 - 52.1 turns
0.13 - 55.9 turns
0.135 - 59.7 turns
0.14 - 63.5 turns
0.145 - 67.3 turns
0.15 - 71.1 turns

Physics Operator Summaries

Entered: Jul 7 2004 04:36:48:897PM

Author: Bill Rowan

Physop Run Summary for 1040129. Thursday, January 29, 2004

Purpose: Execute MP#360, Initial test of a load tolerant configuration on
E-Antenna

Session Leader: Alexandre Parisot
Physics Operator: Bill Rowan

Engineering setup---------------------------------------------------------
ECDC overnight in D2, stopping by 07:00.
Bake at 60 C (check with Irby)

Run Begins at 09:00 and ends at 17:00

Power system setup for first half as on 1040106033

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)
fill NINJA (lower cap) with 6psi Helium

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

RF: Transmitters #1 and 2 in RUN-ON by 08:00
---------------------------------------------------------------------------

Run Summary----------------------------------------------------------------
Fiducial Shot
The shot was constructed from the last pre boronization fiducial (1040106033)
and a more recent breakdown/current rise (1040127002). The former was loaded
into the shot model. Segment 1 of the latter was loaded into segment 1 of the
current shot model. With this model shot, there were periodic fizzles.
Segment 2, the fiducial, ran easily

Repairs to breakdown, segment 1
Fizzles occurred periodically during the first part of the day. Prefill, Bz_0
and BR_0 varied only over the range defined by the first few shots of run
1040127. The prefill pressure was increasing shot by shot so the prefill time
was decreased from 15 ms to 13 ms. Changes in Bz_0 increased the occurrence of
fizzles or had no impact. Specifically, the starting value for IC_EF4U
was -1335. Fizzles continued for IC_EF4U = -1330 and increased in rate for
IC_EF4U = -1340. The fizzles stopped when BR_0 offset was changed from .5 mT
to 0 mT. Note that based on the measured BR_0 and Bz_0, there was no
indication that this was the needed change.

Additional activity
Yujin Lin believes that a contributor to declining performance is the timing of
the fuelling. He identified a trend (1996 to present) in which the gas puff
rate in segment 1 has declinging over time with the result that the particle
density stays low for a longer period of time now compared to 6 years ago.
He asked that more gas be puffed early. This was attempted briefly in the shots
ranging from 016 to 018. Fizzles were a problem in this range of shots. So,
the attempts were stopped with no result.

Score Card
Plasmas 25 (001,002,004,005,006,008,009,010,
012,013,015,016,018,020,021,022,
023,024,025,026,027,029,030,031,
032)
Fizzles 6 (003,007,011,014,017,019)
Engineering Fault 1 (028)

Total 32

Detailed Log---------------------------------------------------------------

001.
Load the fiducial shot. 1040106033
Loaded segment 1 from segment 1 of 1040127002
Plasma. DNB at 0.6 s. Short beam

Next shot. No PCS changes

002.
No changes for this shot.
Plasma.

No pcs changes for the next shot.

003. Fizzle.

Next shot. Reduced the prefill by 2 ms. From 15 ms to 13 ms.

004. Plasma.

Next shot. No PCS changes.

005, Plasma.

Next shot. No PCS changes.

006. Plasma

Next shot. No PCS changes. See SL log. There are RF changes on almost every shot.

007. Fizzle.

Next shot. No PCS changes.

008. Plasma.

Next shot. No PCS changes.

009. Plasma.

Next shot. No PCS changes.

010. Plasma

Next shot. No PCS changes

011. Fizzle.

Next shot. IC_EF4U changed from -1335 to -1340

012. Plasma

Next shot. No PCS changes

013. Plasma

Next shot. No PCS changes

014. Fizzle.

Next shot. No PCS changes

015. Plasma.

Next shot. No PCS changes in segment 2
Increase pulse_gas3 in segment 1

016. Plasma

Next shot. No PCS changes in segment 2
Increased pulse_gas3 in segment 1

017. Fizzle.

Next shot. IC_EF4U changed from -1340 to -1335

018. Plasma

Next shot. IC_EF4U changed from -1335 to -1330
Ip from 1 MA to 0.6 MA

019. Fizzle

Next shot.
IC_EF4U changed from -1330 to -1335
BR_0 reduced from 0.0005 to 0.000

020. Plasma.
IP = 0.6 MA

Next shot. Ip = 0.8 MA

021. Plasma

Next shot. IP = 1 MA

022. Plasma

Next shot. No PCS changes

023. Plasma.

Next shot. No PCS changes.

024. Plasma.

Next shot. No PCS changes

025. Plasma.

Next shot. No PCS changes

026. Plasma.

Next shot.
Increase the right gap from 1 cm to 2 cm
RCUR reduced by 0.005 m

027. Plasma

Next shot.
Decrease the right gap to approximately 0.5 cm
RCUR increased to 0.663

028. No plasma. Power supplies did not trigger.
IGOR failure
Note that some diagnostics seem to have re-stored data from shot 027

Next shot. No PCS changes

029. Plasma
right gap is 0.7 cm.

Next shot.
nl_04 = 6e19
IP = 0.6 MA
Right gap = 2 cm (RCUR=0.656m)

030. Plasma.
Density feedback did not work properly.
Density is high

Next shot.
No PCS changes

031. Plasma
0.6 MA
nl_04 = 6.5e+19
right gap = 2 cm

Next shot.
request: nl_04 = 3e+19

032. Plasma

Session Leader Comments

Jan 29 2004 08:10:27:163AM Alexandre Parisot Run Plan for 1040129
MP 360 : Initial test of a load tolerant configuration on E-Antenna

Purpose:
========
We want to perform an initial test of a possible load tolerant configuration
on the E-Port ICRF transmission line system. The load tolerant (LT) system
is meant to reduce the loading variations and allow the system to operate in
both L-mode and H-mode without the need of retuning the phase shifter/stub
tuner (PS-ST) matching system. It can also be used as a prematching system
by reducing the voltage in these matching components.

Plan:
=====
We have two objectives:
1] Test the ideal transmission line model
2] Assess the performance of the LT system for normal ICRF operations. The
main criteria will be the extent of the loading variations at DC1 with fixed PS/ST
lengths.

Shot sequence:
==============

1ST PART:
Start with a fiducial discharge (1040106033) and:
D: 500 kW [0.6-0.8s] max [1.2-1.4s]
E: 500 kW [1.0-1.4s]
Establish symmetric configuration of the LT system (3 shots).
Modify the length of the stubs to realize the load tolerant
configuration (asymmetric) and optimize the system (10 shots).

2ND PART:
Increase power level for D and E by 200 kW increments, from 500kW.
(7 shots)
Once power limits are reached, repeat to collect data on limiting phenomena.
(2 shots)

3RD PART: (10 shots)
Depending on the limiting phenomena, vary the plasma conditions to obtain
large loading variations:
- Increase plasma current to 1.2MA
- Density scan
- Gap scan

Comparing D and E, we will be looking at heating efficiency and impurity
levels.

Jan 29 2004 09:18:14:823AM 1040129001 Alexandre Parisot Fiducial discharge (1040106033 loaded). 1MA 5.4T nl04 = 1.e20 m^-2
D: 500 kW [0.6-0.8s] max [1.2-1.4s]
E: 500 kW [1.0-1.4s]
Stubs: 1:18 2:18 3:18 4:18 (turns from shorter position)

Result:
Plasma. E did not run (mismatched as expected)

Next:
Repeat. Tune E-Antenna.

Jan 29 2004 09:36:17:253AM 1040129002 Alexandre Parisot Fiducial discharge (1040106033 loaded). 1MA 5.4T nl04 = 1.e20 m^-2
D: 500 kW [0.6-0.8s] max [1.2-1.4s]
E: 500 kW [1.0-1.4s]
Stubs: 1:18 2:18 3:18 4:18

Result:
Plasma. E did not go, still mismatched, but better.

Next:
Repeat. Keep tuning E.

Jan 29 2004 10:11:14:443AM 1040129004 Alexandre Parisot Fiducial discharge (1040106033 loaded). 1MA 5.4T nl04 = 1.e20 m^-2
D: 500 kW [0.6-0.8s] max [1.2-1.4s]
E: 500 kW [1.0-1.4s]
Stubs: 1:18 2:18 3:18 4:18

Result:
Plasma. E did run.
The reflection coefficients at E-DC2, DC3 and DC4 are larger than expected.

Next:
Repeat.

Jan 29 2004 10:33:11:980AM 1040129005 Alexandre Parisot Fiducial discharge (1040106033 loaded). 1MA 5.4T nl04 = 1.e20 m^-2
D: 500 kW [0.6-0.8s] max [1.2-1.4s]
E: 500 kW [1.0-1.4s]
Stubs: 1:18 2:18 3:18 4:18

Result:
Plasma. E did run.

Next:
Set asymmetric configuration
1:2 2:2 3:33 4:33 turns.

Jan 29 2004 10:48:42:600AM 1040129006 Alexandre Parisot Fiducial discharge (1040106033 loaded). 1MA 5.4T nl04 = 1.e20 m^-2
D: 500 kW [0.6-0.8s] max [1.2-1.4s]
E: 500 kW [1.0-1.4s]
Stubs: 1:2 2:2 3:33 4:33

Result:
Plasma.
E did run with the same PS/ST settings.
The reflection coefficients at DC2,DC3,DC4 did not change that much, the currents are asymmetric on
the straps.

Next:
Repeat

Jan 29 2004 11:13:23:497AM 1040129008 Alexandre Parisot Fiducial discharge (1040106033 loaded). 1MA 5.4T nl04 = 1.e20 m^-2
D: 500 kW [0.6-0.8s] max [1.2-1.4s]
E: 500 kW [1.0-1.4s]
Stubs: 1:2 2:2 3:33 4:33

Result:
Plasma. No change.
It seems the phase at the 4 antenna ports changes at well with the asymmetry.
Preliminary analysis with the model suggests this is compatible with no change in the reflection
coefficient. We will scan the lengths of the stubs, going further back toward symmetry and over to
gather data.

Next:
Stub settings 1:0 2:0 3:40 4:40

Jan 29 2004 11:32:04:570AM 1040129009 Alexandre Parisot Fiducial discharge (1040106033 loaded). 1MA 5.4T nl04 = 1.e20 m^-2
D: 500 kW [0.6-0.8s] max [1.2-1.4s]
E: 500 kW [1.0-1.4s]
Stubs: 1:0 2:0 3:40 4:40

Result:
Plasma. Same story.
We will continue the scan.

Next:
Stub settings 1:10 2:10 3:25 4:25

Jan 29 2004 11:44:32:410AM 1040129010 Alexandre Parisot Fiducial discharge (1040106033 loaded). 1MA 5.4T nl04 = 1.e20 m^-2
D: 500 kW [0.6-0.8s] max [1.2-1.4s]
E: 500 kW [1.0-1.4s]
Stubs: 1:10 2:10 3:25 4:25

Result:
Plasma.

Next:
Stub settings 1:25 2:25 3:10 4:10

Jan 29 2004 12:17:14:427PM 1040129012 Alexandre Parisot Fiducial discharge (1040106033 loaded). 1MA 5.4T nl04 = 1.e20 m^-2
D: 500 kW [0.6-0.8s] max [1.2-1.4s]
E: 500 kW [1.0-1.4s]
Stubs: 1:25 2:25 3:10 4:10

Result:
Plasma.

Next:
Stub settings 1:33 2:33 3:2 4:2

Jan 29 2004 12:23:48:283PM 1040129013 Alexandre Parisot Fiducial discharge (1040106033 loaded). 1MA 5.4T nl04 = 1.e20 m^-2
D: 500 kW [0.6-0.8s] max [1.2-1.4s]
E: 500 kW [1.0-1.4s]
Stubs: 1:33 2:33 3:2 4:2

Result:
Plasma.

Next:
Stub settings 1:40 2:40 3:0 4:0

Jan 29 2004 12:49:51:900PM 1040129015 Alexandre Parisot Fiducial discharge (1040106033 loaded). 1MA 5.4T nl04 = 1.e20 m^-2
D: 500 kW [0.6-0.8s] max [1.2-1.4s]
E: 500 kW [1.0-1.4s]
Stubs: 1:40 2:40 3:0 4:0

Result:
Plasma. From this settings scan, we have a good picture of the limiting phenomena
in the systems. We are going to raise power to look for potential impurity production
in the 2 most asymmetric configurations.

Next:
Raise power from D and E by 250kW increments.

Jan 29 2004 01:04:22:127PM 1040129016 Alexandre Parisot Fiducial discharge (1040106033 loaded). 1MA 5.4T nl04 = 1.e20 m^-2
D: 750 kW [0.6-0.8s] max [1.2-1.4s]
E: 750 kW [1.0-1.4s]
Stubs: 1:40 2:40 3:0 4:0

Result:
Plasma. E is not running well when D is on.

Next:
Raise power from E to 1 MW. Leave D off while E is on.

Jan 29 2004 01:34:58:427PM 1040129018 Alexandre Parisot Fiducial discharge. 1MA 5.4T nl04 = 1.e20 m^-2
D: 1MW [0.6-0.8s]
E: 1MW [1.0-1.4s]
Stubs: 1:40 2:40 3:0 4:0

Result:
Plasma. E has many faults.

Next:
Reduce plasma current to 0.6 MA, this should reduce the coupling.
Reduce the power from E to 700 kW to prevent faults.

Jan 29 2004 02:07:16:133PM 1040129020 Alexandre Parisot 0.6MA 5.4T nl04 = 1.e20 m^-2
D: 700kW [0.6-0.8s]
E: 700kW [1.0-1.4s]
Stubs: 1:40 2:40 3:0 4:0

Result:
Plasma. The reflection coefficient at DC2,DC3,DC4 was slightly reduced.
We will get another value of the plasma current to study this.

Next
Go to 0.8 MA.

Jan 29 2004 02:24:00:800PM 1040129021 Alexandre Parisot 0.8MA 5.4T nl04 = 1.e20 m^-2
D: 700kW [0.6-0.8s]
E: 700kW [1.0-1.4s]
Stubs: 1:40 2:40 3:0 4:0

Result:
Plasma. The third value of current confirms the trend.
Data suggests the power limits on E come from power imbalance, and not voltage
limits on the main line. As the reflection coefficients are close in both setups, we will
go the symmetric configuration and provide a comparison with shot 18.

Next
Go back to 1.0 MA. and 1 MW from D and E.

Jan 29 2004 02:41:27:620PM 1040129022 Alexandre Parisot 1.0MA 5.4T nl04 = 1.e20 m^-2
D: 700kW [0.6-0.8s]
E: 700kW [1.0-1.4s]
Stubs: 1:18 2:18 3:18 4:18

Result:
Plasma. Still faulting in the symmetric configuration.

Next
Go to 1:0 2:40 3:40 4:0 (asymmetric reversed)

Jan 29 2004 02:50:27:447PM 1040129023 Alexandre Parisot 1.0MA 5.4T nl04 = 1.e20 m^-2
D: 1MW [0.6-0.8s]
E: 1MW [1.0-1.4s]
Stubs: 1:0 2:40 3:40 4:0

Result:
Plasma. Did not provide a good D and E comparison in L/H mode.

Next:
Repeat.

Jan 29 2004 03:13:28:250PM 1040129024 Alexandre Parisot 1.0MA 5.4T nl04 = 1.e20 m^-2
D: 1MW [0.6-0.8s]
E: 1MW [1.0-1.4s]
Stubs: 1:0 2:40 3:40 4:0

Result:
Plasma. Good data.

Next:
Go to 1:40 2:0 3:0 4:40

Jan 29 2004 03:23:58:700PM 1040129025 Alexandre Parisot 1.0MA 5.4T nl04 = 1.e20 m^-2
D: 1MW [0.6-0.8s]
E: 1MW [1.0-1.4s]
Stubs: 1:40 2:0 3:0 4:40

Result:
Plasma. The last two shots suggest high level of coupling toroidally between the two straps.
We will try a semi-asymmetric configuration to investigate this.

Next:
Go to 1:40 2:18 3:0 4:18

Jan 29 2004 05:05:19:567PM 1040129026 Alexandre Parisot 1.0MA 5.4T nl04 = 1.e20 m^-2
D: 1MW [0.6-0.8s]
E: 1MW [1.0-1.4s]
Stubs: 1:40 2:18 3:0 4:18

Result:
Plasma. Data confirms a high level of coupling toroidally between the two straps.
We will investigate the effect of the gap on this coupling level.

Next:
Increase the gap to 2cm.

Jan 29 2004 04:47:58:857PM 1040129027 Alexandre Parisot 1.0MA 5.4T nl04 = 1.e20 m^-2 gap 2cm
D: 1MW [0.6-0.8s]
E: 1MW [1.0-1.4s]
Stubs: 1:40 2:18 3:0 4:18

Result:
Plasma. This did not change the coupling significantly.

Next:
Decrease the gap to 0.5cm

Jan 29 2004 04:48:15:530PM 1040129029 Alexandre Parisot 1.0MA 5.4T nl04 = 1.e20 m^-2 gap 0.7cm
D: 1MW [0.6-0.8s]
E: 1MW [1.0-1.4s]
Stubs: 1:40 2:18 3:0 4:18

Result:
Plasma. Again, no significant changes in the coupling.
As suggested by the cut-off model, we can decrease the coupling by
going low density, large gap, low current.

Next:
Target density to 0.6e20 m^-2
Gap 2cm
Plasma current 0.6 MA

Jan 29 2004 04:49:30:623PM 1040129031 Alexandre Parisot .6MA 5.4T nl04 = 0.6e20 m^-2 gap 2cm
D: 1MW [0.6-0.8s]
E: 1MW [1.0-1.4s]
Stubs: 1:40 2:18 3:0 4:18

Result:
Plasma. The coupling changed only slightly.
We'll go even lower density.

Next:
Target density to 0.3e20 m^-2

Jan 29 2004 05:10:27:210PM 1040129032 Alexandre Parisot .6MA 5.4T nl04 = 0.4e20 m^-2 gap 2cm
D: 1MW [0.6-0.8s]
E: 1MW [1.0-1.4s]
Stubs: 1:40 2:18 3:0 4:18

Result:
Plasma. Again, the coupling changed only slightly.

End of run

Physics Operator Comments

Jan 29 2004 08:16:32:193AM Bill Rowan Engineering setup for Thursday 1/29/2004. Run 1040129

MP#360 Initial test of a load tolerant configuration on E-Antenna
SL: Parisot
PO: Rowan

ECDC overnight in D2, stopping by 07:00.
Bake at 60 C (check with Irby)

Run Begins at 09:00 and ends at 17:00

Power system setup for first half as on 1040106033

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)
fill NINJA (lower cap) with 6psi Helium

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

RF: Transmitters #1 and 2 in RUN-ON by 08:00

Jan 29 2004 08:33:39:370AM 1040129001 Bill Rowan 001.
Load the fiducial shot. 1040106033
Loaded segment 1 from segment 1 of 1040127002

Jan 29 2004 09:19:22:387AM 1040129001 Bill Rowan Plasma. DNB at 0.6 s. Short beam

Jan 29 2004 09:24:41:133AM 1040129001 Bill Rowan
Next shot. No PCS changes

Jan 29 2004 09:30:01:740AM 1040129002 Bill Rowan
002.
No changes for this shot.
Plasma.

Jan 29 2004 09:37:33:220AM 1040129002 Bill Rowan

No pcs changes for the next shot.

Jan 29 2004 09:48:30:860AM 1040129003 Bill Rowan
003. Fizzle.

Next shot. Reduced the prefill by 2 ms. From 15 ms to 13 ms.

Jan 29 2004 10:01:34:010AM 1040129004 Bill Rowan

004. Plasma.

Next shot. No PCS changes.

Jan 29 2004 10:16:02:520AM 1040129005 Bill Rowan 005, Plasma.

Jan 29 2004 10:32:46:343AM 1040129005 Bill Rowan

Next shot. No PCS changes.

Jan 29 2004 10:41:54:137AM 1040129006 Bill Rowan 006. Plasma

Jan 29 2004 10:47:21:413AM 1040129006 Bill Rowan

Next shot. No PCS changes. See SL log. There are RF changes on almost every shot.

Jan 29 2004 10:57:13:490AM 1040129007 Bill Rowan 007. Fizzle.

Next shot. No PCS changes.

Jan 29 2004 11:07:24:780AM 1040129008 Bill Rowan 008. Plasma.

Next shot. No PCS changes.

Jan 29 2004 11:24:04:917AM 1040129009 Bill Rowan 009. Plasma.

Jan 29 2004 11:33:04:850AM 1040129009 Bill Rowan

Next shot. No PCS changes.

Jan 29 2004 11:44:24:220AM 1040129010 Bill Rowan 010. Plasma

Next shot. No PCS changes

Jan 29 2004 11:53:21:013AM 1040129011 Bill Rowan 011. Fizzle.

Next shot. IC_EF4U changed from -1335 to -1340

Jan 29 2004 05:30:39:747PM 1040129013 Bill Rowan 013. Plasma

Next shot. No PCS changes in segment 2
Increased pulse_gas3 in segment 1

Jan 29 2004 05:31:11:997PM 1040129014 Bill Rowan 014. Fizzle.

Next shot. No PCS change

Jan 29 2004 05:32:09:483PM 1040129015 Bill Rowan 015. Plasma.

Next shot. No PCS changes in segment 2
Increase pulse_gas3 in segment 1

Jan 29 2004 05:28:02:513PM 1040129016 Bill Rowan 016. Plasma

Next shot. No PCS changes

Jan 29 2004 05:26:56:120PM 1040129017 Bill Rowan 017. Fizzle.

Next shot. IC_EF4U changed from -1340 to -1335
Returned pulse_gas3 to the level of 013 and earlier

Jan 29 2004 01:35:18:117PM 1040129018 Bill Rowan Next shot: Ip from 1 MA to 0.6 MA

Jan 29 2004 01:43:08:630PM 1040129018 Bill Rowan 018. Plasma

Next shot. IC_EF4U changed from -1335 to -1330

Jan 29 2004 01:47:20:470PM 1040129019 Bill Rowan 019. Fizzle

Next shot.
IC_EF4U changed from -1330 to -1335
BR_0 reduced from 0.0005 to 0.000

Jan 29 2004 02:03:56:277PM 1040129020 Bill Rowan 020. Plasma.
IP = 0.6 MA

Next shot. Ip = 0.8 MA

Jan 29 2004 02:19:59:300PM 1040129021 Bill Rowan 021. Plasma

Next shot. IP = 1 MA

Jan 29 2004 02:39:51:887PM 1040129022 Bill Rowan 022. Plasma

Next shot. No PCS changes

Jan 29 2004 02:50:41:350PM 1040129023 Bill Rowan
023. Plasma.

Next shot. No PCS changes.

Jan 29 2004 03:04:12:580PM 1040129024 Bill Rowan 024. Plasma.

Next shot. No PCS changes

Jan 29 2004 03:17:15:700PM 1040129025 Bill Rowan 025. Plasma.

Next shot. No PCS changes

Jan 29 2004 03:33:16:867PM 1040129026 Bill Rowan 026. Plasma.

Next shot.
Increase the right gap from 1 cm to 2 cm
RCUR reduced by 0.005 m

Jan 29 2004 03:48:26:203PM 1040129027 Bill Rowan 027. Plasma

Next shot.
Decrease the right gap to approximately 0.5 cm
RCUR increased to 0.663

Jan 29 2004 04:01:06:857PM 1040129028 Bill Rowan 28. No plasma. Power supplies did not trigger.

Jan 29 2004 04:04:19:510PM 1040129028 Bill Rowan
IGOR failure

Jan 29 2004 04:04:45:433PM 1040129028 Bill Rowan

Next shot. No PCS changes

Jan 29 2004 04:19:52:470PM 1040129029 Bill Rowan 029. Plasma
right gap is 0.7 cm.

Next shot.
nl_04 = 6e19
IP = 0.6 MA
Right gap = 2 cm (RCUR=0.656m)

Jan 29 2004 04:25:43:707PM 1040129030 Bill Rowan 030. Plasma.
Density feedback did not work properly.
Density is high

Next shot.
No PCS changes

Jan 29 2004 04:41:57:057PM 1040129031 Bill Rowan 031. Plasma
0.6 MA
nl_04 = 6.5e+19
right gap = 2 cm

Jan 29 2004 04:47:00:010PM 1040129031 Bill Rowan
Next shot.
request: nl_04 = 3e+19

Engineering Operator Comments

Shot Time Type Status Comment

1 09:12:06:717AM Plasma Ok

2 09:26:10:477AM Plasma Ok

3 09:41:36:033AM Plasma Ok

4 09:57:49:997AM Plasma Ok

5 10:13:17:003AM Plasma Ok

6 10:33:53:590AM Plasma Ok

7 10:48:50:147AM Plasma Ok

8 11:02:35:237AM Plasma Ok

9 11:15:54:653AM Plasma Ok

10 11:33:40:850AM Plasma Ok

11 11:47:28:140AM Plasma Ok

12 12:00:46:683PM Plasma Ok

13 12:18:08:660PM Plasma Ok

14 12:31:25:780PM Plasma Ok

15 12:43:58:667PM Plasma Ok

16 12:56:41:083PM Plasma Ok

17 01:10:54:953PM Plasma Ok

18 01:23:34:040PM Plasma Ok

19 01:37:29:600PM Plasma Ok

20 01:50:23:280PM Plasma Ok

21 02:04:59:963PM Plasma Ok

22 02:26:26:707PM Plasma Ok

23 02:40:36:073PM Plasma Ok

24 02:53:22:227PM Plasma Ok

25 03:13:50:733PM Plasma Ok

26 03:26:38:823PM Plasma Ok

27 03:40:34:897PM Plasma Ok

28 03:55:05:640PM Plasma Bad IGOR failure going into pulse, no shot.

29 04:07:25:120PM Plasma Ok

30 04:21:45:190PM Plasma Ok

31 04:38:28:120PM Plasma Ok

32 04:51:24:030PM Plasma Ok

Session Leader Comments
Jan 29 2004 08:10:27:163AM		Alexandre Parisot	Run Plan for 1040129 MP 360 : Initial test of a load tolerant configuration on E-Antenna Purpose: ======== We want to perform an initial test of a possible load tolerant configuration on the E-Port ICRF transmission line system. The load tolerant (LT) system is meant to reduce the loading variations and allow the system to operate in both L-mode and H-mode without the need of retuning the phase shifter/stub tuner (PS-ST) matching system. It can also be used as a prematching system by reducing the voltage in these matching components. Plan: ===== We have two objectives: 1] Test the ideal transmission line model 2] Assess the performance of the LT system for normal ICRF operations. The main criteria will be the extent of the loading variations at DC1 with fixed PS/ST lengths. Shot sequence: ============== 1ST PART: Start with a fiducial discharge (1040106033) and: D: 500 kW [0.6-0.8s] max [1.2-1.4s] E: 500 kW [1.0-1.4s] Establish symmetric configuration of the LT system (3 shots). Modify the length of the stubs to realize the load tolerant configuration (asymmetric) and optimize the system (10 shots). 2ND PART: Increase power level for D and E by 200 kW increments, from 500kW. (7 shots) Once power limits are reached, repeat to collect data on limiting phenomena. (2 shots) 3RD PART: (10 shots) Depending on the limiting phenomena, vary the plasma conditions to obtain large loading variations: - Increase plasma current to 1.2MA - Density scan - Gap scan Comparing D and E, we will be looking at heating efficiency and impurity levels.
Jan 29 2004 09:18:14:823AM	1040129001	Alexandre Parisot	Fiducial discharge (1040106033 loaded). 1MA 5.4T nl04 = 1.e20 m^-2 D: 500 kW [0.6-0.8s] max [1.2-1.4s] E: 500 kW [1.0-1.4s] Stubs: 1:18 2:18 3:18 4:18 (turns from shorter position) Result: Plasma. E did not run (mismatched as expected) Next: Repeat. Tune E-Antenna.
Jan 29 2004 09:36:17:253AM	1040129002	Alexandre Parisot	Fiducial discharge (1040106033 loaded). 1MA 5.4T nl04 = 1.e20 m^-2 D: 500 kW [0.6-0.8s] max [1.2-1.4s] E: 500 kW [1.0-1.4s] Stubs: 1:18 2:18 3:18 4:18 Result: Plasma. E did not go, still mismatched, but better. Next: Repeat. Keep tuning E.
Jan 29 2004 10:11:14:443AM	1040129004	Alexandre Parisot	Fiducial discharge (1040106033 loaded). 1MA 5.4T nl04 = 1.e20 m^-2 D: 500 kW [0.6-0.8s] max [1.2-1.4s] E: 500 kW [1.0-1.4s] Stubs: 1:18 2:18 3:18 4:18 Result: Plasma. E did run. The reflection coefficients at E-DC2, DC3 and DC4 are larger than expected. Next: Repeat.
Jan 29 2004 10:33:11:980AM	1040129005	Alexandre Parisot	Fiducial discharge (1040106033 loaded). 1MA 5.4T nl04 = 1.e20 m^-2 D: 500 kW [0.6-0.8s] max [1.2-1.4s] E: 500 kW [1.0-1.4s] Stubs: 1:18 2:18 3:18 4:18 Result: Plasma. E did run. Next: Set asymmetric configuration 1:2 2:2 3:33 4:33 turns.
Jan 29 2004 10:48:42:600AM	1040129006	Alexandre Parisot	Fiducial discharge (1040106033 loaded). 1MA 5.4T nl04 = 1.e20 m^-2 D: 500 kW [0.6-0.8s] max [1.2-1.4s] E: 500 kW [1.0-1.4s] Stubs: 1:2 2:2 3:33 4:33 Result: Plasma. E did run with the same PS/ST settings. The reflection coefficients at DC2,DC3,DC4 did not change that much, the currents are asymmetric on the straps. Next: Repeat
Jan 29 2004 11:13:23:497AM	1040129008	Alexandre Parisot	Fiducial discharge (1040106033 loaded). 1MA 5.4T nl04 = 1.e20 m^-2 D: 500 kW [0.6-0.8s] max [1.2-1.4s] E: 500 kW [1.0-1.4s] Stubs: 1:2 2:2 3:33 4:33 Result: Plasma. No change. It seems the phase at the 4 antenna ports changes at well with the asymmetry. Preliminary analysis with the model suggests this is compatible with no change in the reflection coefficient. We will scan the lengths of the stubs, going further back toward symmetry and over to gather data. Next: Stub settings 1:0 2:0 3:40 4:40
Jan 29 2004 11:32:04:570AM	1040129009	Alexandre Parisot	Fiducial discharge (1040106033 loaded). 1MA 5.4T nl04 = 1.e20 m^-2 D: 500 kW [0.6-0.8s] max [1.2-1.4s] E: 500 kW [1.0-1.4s] Stubs: 1:0 2:0 3:40 4:40 Result: Plasma. Same story. We will continue the scan. Next: Stub settings 1:10 2:10 3:25 4:25
Jan 29 2004 11:44:32:410AM	1040129010	Alexandre Parisot	Fiducial discharge (1040106033 loaded). 1MA 5.4T nl04 = 1.e20 m^-2 D: 500 kW [0.6-0.8s] max [1.2-1.4s] E: 500 kW [1.0-1.4s] Stubs: 1:10 2:10 3:25 4:25 Result: Plasma. Next: Stub settings 1:25 2:25 3:10 4:10
Jan 29 2004 12:17:14:427PM	1040129012	Alexandre Parisot	Fiducial discharge (1040106033 loaded). 1MA 5.4T nl04 = 1.e20 m^-2 D: 500 kW [0.6-0.8s] max [1.2-1.4s] E: 500 kW [1.0-1.4s] Stubs: 1:25 2:25 3:10 4:10 Result: Plasma. Next: Stub settings 1:33 2:33 3:2 4:2
Jan 29 2004 12:23:48:283PM	1040129013	Alexandre Parisot	Fiducial discharge (1040106033 loaded). 1MA 5.4T nl04 = 1.e20 m^-2 D: 500 kW [0.6-0.8s] max [1.2-1.4s] E: 500 kW [1.0-1.4s] Stubs: 1:33 2:33 3:2 4:2 Result: Plasma. Next: Stub settings 1:40 2:40 3:0 4:0
Jan 29 2004 12:49:51:900PM	1040129015	Alexandre Parisot	Fiducial discharge (1040106033 loaded). 1MA 5.4T nl04 = 1.e20 m^-2 D: 500 kW [0.6-0.8s] max [1.2-1.4s] E: 500 kW [1.0-1.4s] Stubs: 1:40 2:40 3:0 4:0 Result: Plasma. From this settings scan, we have a good picture of the limiting phenomena in the systems. We are going to raise power to look for potential impurity production in the 2 most asymmetric configurations. Next: Raise power from D and E by 250kW increments.
Jan 29 2004 01:04:22:127PM	1040129016	Alexandre Parisot	Fiducial discharge (1040106033 loaded). 1MA 5.4T nl04 = 1.e20 m^-2 D: 750 kW [0.6-0.8s] max [1.2-1.4s] E: 750 kW [1.0-1.4s] Stubs: 1:40 2:40 3:0 4:0 Result: Plasma. E is not running well when D is on. Next: Raise power from E to 1 MW. Leave D off while E is on.
Jan 29 2004 01:34:58:427PM	1040129018	Alexandre Parisot	Fiducial discharge. 1MA 5.4T nl04 = 1.e20 m^-2 D: 1MW [0.6-0.8s] E: 1MW [1.0-1.4s] Stubs: 1:40 2:40 3:0 4:0 Result: Plasma. E has many faults. Next: Reduce plasma current to 0.6 MA, this should reduce the coupling. Reduce the power from E to 700 kW to prevent faults.
Jan 29 2004 02:07:16:133PM	1040129020	Alexandre Parisot	0.6MA 5.4T nl04 = 1.e20 m^-2 D: 700kW [0.6-0.8s] E: 700kW [1.0-1.4s] Stubs: 1:40 2:40 3:0 4:0 Result: Plasma. The reflection coefficient at DC2,DC3,DC4 was slightly reduced. We will get another value of the plasma current to study this. Next Go to 0.8 MA.
Jan 29 2004 02:24:00:800PM	1040129021	Alexandre Parisot	0.8MA 5.4T nl04 = 1.e20 m^-2 D: 700kW [0.6-0.8s] E: 700kW [1.0-1.4s] Stubs: 1:40 2:40 3:0 4:0 Result: Plasma. The third value of current confirms the trend. Data suggests the power limits on E come from power imbalance, and not voltage limits on the main line. As the reflection coefficients are close in both setups, we will go the symmetric configuration and provide a comparison with shot 18. Next Go back to 1.0 MA. and 1 MW from D and E.
Jan 29 2004 02:41:27:620PM	1040129022	Alexandre Parisot	1.0MA 5.4T nl04 = 1.e20 m^-2 D: 700kW [0.6-0.8s] E: 700kW [1.0-1.4s] Stubs: 1:18 2:18 3:18 4:18 Result: Plasma. Still faulting in the symmetric configuration. Next Go to 1:0 2:40 3:40 4:0 (asymmetric reversed)
Jan 29 2004 02:50:27:447PM	1040129023	Alexandre Parisot	1.0MA 5.4T nl04 = 1.e20 m^-2 D: 1MW [0.6-0.8s] E: 1MW [1.0-1.4s] Stubs: 1:0 2:40 3:40 4:0 Result: Plasma. Did not provide a good D and E comparison in L/H mode. Next: Repeat.
Jan 29 2004 03:13:28:250PM	1040129024	Alexandre Parisot	1.0MA 5.4T nl04 = 1.e20 m^-2 D: 1MW [0.6-0.8s] E: 1MW [1.0-1.4s] Stubs: 1:0 2:40 3:40 4:0 Result: Plasma. Good data. Next: Go to 1:40 2:0 3:0 4:40
Jan 29 2004 03:23:58:700PM	1040129025	Alexandre Parisot	1.0MA 5.4T nl04 = 1.e20 m^-2 D: 1MW [0.6-0.8s] E: 1MW [1.0-1.4s] Stubs: 1:40 2:0 3:0 4:40 Result: Plasma. The last two shots suggest high level of coupling toroidally between the two straps. We will try a semi-asymmetric configuration to investigate this. Next: Go to 1:40 2:18 3:0 4:18
Jan 29 2004 05:05:19:567PM	1040129026	Alexandre Parisot	1.0MA 5.4T nl04 = 1.e20 m^-2 D: 1MW [0.6-0.8s] E: 1MW [1.0-1.4s] Stubs: 1:40 2:18 3:0 4:18 Result: Plasma. Data confirms a high level of coupling toroidally between the two straps. We will investigate the effect of the gap on this coupling level. Next: Increase the gap to 2cm.
Jan 29 2004 04:47:58:857PM	1040129027	Alexandre Parisot	1.0MA 5.4T nl04 = 1.e20 m^-2 gap 2cm D: 1MW [0.6-0.8s] E: 1MW [1.0-1.4s] Stubs: 1:40 2:18 3:0 4:18 Result: Plasma. This did not change the coupling significantly. Next: Decrease the gap to 0.5cm
Jan 29 2004 04:48:15:530PM	1040129029	Alexandre Parisot	1.0MA 5.4T nl04 = 1.e20 m^-2 gap 0.7cm D: 1MW [0.6-0.8s] E: 1MW [1.0-1.4s] Stubs: 1:40 2:18 3:0 4:18 Result: Plasma. Again, no significant changes in the coupling. As suggested by the cut-off model, we can decrease the coupling by going low density, large gap, low current. Next: Target density to 0.6e20 m^-2 Gap 2cm Plasma current 0.6 MA
Jan 29 2004 04:49:30:623PM	1040129031	Alexandre Parisot	.6MA 5.4T nl04 = 0.6e20 m^-2 gap 2cm D: 1MW [0.6-0.8s] E: 1MW [1.0-1.4s] Stubs: 1:40 2:18 3:0 4:18 Result: Plasma. The coupling changed only slightly. We'll go even lower density. Next: Target density to 0.3e20 m^-2
Jan 29 2004 05:10:27:210PM	1040129032	Alexandre Parisot	.6MA 5.4T nl04 = 0.4e20 m^-2 gap 2cm D: 1MW [0.6-0.8s] E: 1MW [1.0-1.4s] Stubs: 1:40 2:18 3:0 4:18 Result: Plasma. Again, the coupling changed only slightly. End of run

Physics Operator Comments
Jan 29 2004 08:16:32:193AM		Bill Rowan	Engineering setup for Thursday 1/29/2004. Run 1040129 MP#360 Initial test of a load tolerant configuration on E-Antenna SL: Parisot PO: Rowan ECDC overnight in D2, stopping by 07:00. Bake at 60 C (check with Irby) Run Begins at 09:00 and ends at 17:00 Power system setup for first half as on 1040106033 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) fill NINJA (lower cap) with 6psi Helium Gate valve permissives for the usual suspectsd (ECE,VUV,DNB) assuming no vacuum problems RF: Transmitters #1 and 2 in RUN-ON by 08:00
Jan 29 2004 08:33:39:370AM	1040129001	Bill Rowan	001. Load the fiducial shot. 1040106033 Loaded segment 1 from segment 1 of 1040127002
Jan 29 2004 09:19:22:387AM	1040129001	Bill Rowan	Plasma. DNB at 0.6 s. Short beam
Jan 29 2004 09:24:41:133AM	1040129001	Bill Rowan	Next shot. No PCS changes
Jan 29 2004 09:30:01:740AM	1040129002	Bill Rowan	002. No changes for this shot. Plasma.
Jan 29 2004 09:37:33:220AM	1040129002	Bill Rowan	No pcs changes for the next shot.
Jan 29 2004 09:48:30:860AM	1040129003	Bill Rowan	003. Fizzle. Next shot. Reduced the prefill by 2 ms. From 15 ms to 13 ms.
Jan 29 2004 10:01:34:010AM	1040129004	Bill Rowan	004. Plasma. Next shot. No PCS changes.
Jan 29 2004 10:16:02:520AM	1040129005	Bill Rowan	005, Plasma.
Jan 29 2004 10:32:46:343AM	1040129005	Bill Rowan	Next shot. No PCS changes.
Jan 29 2004 10:41:54:137AM	1040129006	Bill Rowan	006. Plasma
Jan 29 2004 10:47:21:413AM	1040129006	Bill Rowan	Next shot. No PCS changes. See SL log. There are RF changes on almost every shot.
Jan 29 2004 10:57:13:490AM	1040129007	Bill Rowan	007. Fizzle. Next shot. No PCS changes.
Jan 29 2004 11:07:24:780AM	1040129008	Bill Rowan	008. Plasma. Next shot. No PCS changes.
Jan 29 2004 11:24:04:917AM	1040129009	Bill Rowan	009. Plasma.
Jan 29 2004 11:33:04:850AM	1040129009	Bill Rowan	Next shot. No PCS changes.
Jan 29 2004 11:44:24:220AM	1040129010	Bill Rowan	010. Plasma Next shot. No PCS changes
Jan 29 2004 11:53:21:013AM	1040129011	Bill Rowan	011. Fizzle. Next shot. IC_EF4U changed from -1335 to -1340
Jan 29 2004 05:30:39:747PM	1040129013	Bill Rowan	013. Plasma Next shot. No PCS changes in segment 2 Increased pulse_gas3 in segment 1
Jan 29 2004 05:31:11:997PM	1040129014	Bill Rowan	014. Fizzle. Next shot. No PCS change
Jan 29 2004 05:32:09:483PM	1040129015	Bill Rowan	015. Plasma. Next shot. No PCS changes in segment 2 Increase pulse_gas3 in segment 1
Jan 29 2004 05:28:02:513PM	1040129016	Bill Rowan	016. Plasma Next shot. No PCS changes
Jan 29 2004 05:26:56:120PM	1040129017	Bill Rowan	017. Fizzle. Next shot. IC_EF4U changed from -1340 to -1335 Returned pulse_gas3 to the level of 013 and earlier
Jan 29 2004 01:35:18:117PM	1040129018	Bill Rowan	Next shot: Ip from 1 MA to 0.6 MA
Jan 29 2004 01:43:08:630PM	1040129018	Bill Rowan	018. Plasma Next shot. IC_EF4U changed from -1335 to -1330
Jan 29 2004 01:47:20:470PM	1040129019	Bill Rowan	019. Fizzle Next shot. IC_EF4U changed from -1330 to -1335 BR_0 reduced from 0.0005 to 0.000
Jan 29 2004 02:03:56:277PM	1040129020	Bill Rowan	020. Plasma. IP = 0.6 MA Next shot. Ip = 0.8 MA
Jan 29 2004 02:19:59:300PM	1040129021	Bill Rowan	021. Plasma Next shot. IP = 1 MA
Jan 29 2004 02:39:51:887PM	1040129022	Bill Rowan	022. Plasma Next shot. No PCS changes
Jan 29 2004 02:50:41:350PM	1040129023	Bill Rowan	023. Plasma. Next shot. No PCS changes.
Jan 29 2004 03:04:12:580PM	1040129024	Bill Rowan	024. Plasma. Next shot. No PCS changes
Jan 29 2004 03:17:15:700PM	1040129025	Bill Rowan	025. Plasma. Next shot. No PCS changes
Jan 29 2004 03:33:16:867PM	1040129026	Bill Rowan	026. Plasma. Next shot. Increase the right gap from 1 cm to 2 cm RCUR reduced by 0.005 m
Jan 29 2004 03:48:26:203PM	1040129027	Bill Rowan	027. Plasma Next shot. Decrease the right gap to approximately 0.5 cm RCUR increased to 0.663
Jan 29 2004 04:01:06:857PM	1040129028	Bill Rowan	28. No plasma. Power supplies did not trigger.
Jan 29 2004 04:04:19:510PM	1040129028	Bill Rowan	IGOR failure
Jan 29 2004 04:04:45:433PM	1040129028	Bill Rowan	Next shot. No PCS changes
Jan 29 2004 04:19:52:470PM	1040129029	Bill Rowan	029. Plasma right gap is 0.7 cm. Next shot. nl_04 = 6e19 IP = 0.6 MA Right gap = 2 cm (RCUR=0.656m)
Jan 29 2004 04:25:43:707PM	1040129030	Bill Rowan	030. Plasma. Density feedback did not work properly. Density is high Next shot. No PCS changes
Jan 29 2004 04:41:57:057PM	1040129031	Bill Rowan	031. Plasma 0.6 MA nl_04 = 6.5e+19 right gap = 2 cm
Jan 29 2004 04:47:00:010PM	1040129031	Bill Rowan	Next shot. request: nl_04 = 3e+19

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	09:12:06:717AM	Plasma	Ok
2	09:26:10:477AM	Plasma	Ok
3	09:41:36:033AM	Plasma	Ok
4	09:57:49:997AM	Plasma	Ok
5	10:13:17:003AM	Plasma	Ok
6	10:33:53:590AM	Plasma	Ok
7	10:48:50:147AM	Plasma	Ok
8	11:02:35:237AM	Plasma	Ok
9	11:15:54:653AM	Plasma	Ok
10	11:33:40:850AM	Plasma	Ok
11	11:47:28:140AM	Plasma	Ok
12	12:00:46:683PM	Plasma	Ok
13	12:18:08:660PM	Plasma	Ok
14	12:31:25:780PM	Plasma	Ok
15	12:43:58:667PM	Plasma	Ok
16	12:56:41:083PM	Plasma	Ok
17	01:10:54:953PM	Plasma	Ok
18	01:23:34:040PM	Plasma	Ok
19	01:37:29:600PM	Plasma	Ok
20	01:50:23:280PM	Plasma	Ok
21	02:04:59:963PM	Plasma	Ok
22	02:26:26:707PM	Plasma	Ok
23	02:40:36:073PM	Plasma	Ok
24	02:53:22:227PM	Plasma	Ok
25	03:13:50:733PM	Plasma	Ok
26	03:26:38:823PM	Plasma	Ok
27	03:40:34:897PM	Plasma	Ok
28	03:55:05:640PM	Plasma	Bad	IGOR failure going into pulse, no shot.
29	04:07:25:120PM	Plasma	Ok
30	04:21:45:190PM	Plasma	Ok
31	04:38:28:120PM	Plasma	Ok
32	04:51:24:030PM	Plasma	Ok