Difference between revisions of "GTS meeting 3 28 17"
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| + | * Sajini Wijethunga, ''Comparison of the focal length of the solenoid'': [[media:focal_length_and_emittance.pdf]] | ||
| + | # Data can be found here: [https://logbooks/entry/3468314] [https://logbooks/entry/3468315] | ||
| + | # '''There is an indication of problem with first solenoid''' | ||
| + | |||
* Conditioned Gun at 300 kV with solenoid at 0 to 300 A, left to do it at: 325, 350, 375, and 400 A. Two currents, 350 and 400 A, we attempted before but we will repeat. | * Conditioned Gun at 300 kV with solenoid at 0 to 300 A, left to do it at: 325, 350, 375, and 400 A. Two currents, 350 and 400 A, we attempted before but we will repeat. | ||
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* Attempting to center solenoid by moving magnet: | * Attempting to center solenoid by moving magnet: | ||
# Moved solenoid 1.5 mm to beam left - closer to active area at 3:00 o'clock | # Moved solenoid 1.5 mm to beam left - closer to active area at 3:00 o'clock | ||
| − | # Moved solenoid 3.2 mm (from center) to beam right. In both cases no improvement by looking at beam on ITVGT03 (first viewer) while scanning the solenoid between 10-150 Amps. Beam can be seen on edge of viewer rotating clockwise. | + | # Moved solenoid 3.2 mm (from center) to beam right. In both cases no improvement by looking at beam on ITVGT03 (first viewer) while scanning the solenoid between 10-150 Amps. Beam can be seen on edge of viewer rotating clockwise then drifting towards -45 degrees (lower-right) as solenoid current approaches 150 Amps. |
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* Attempting to center solenoid by moving active area: | * Attempting to center solenoid by moving active area: | ||
| − | # Moved active area to 9:00 o'clock, 12 o'clock and 6 o'clock. In the three cases no improvement by looking at beam on ITVGT03 (first viewer) while scanning the solenoid between 10-150 Amps. beam behaved similarly at the | + | # Moved active area to 9:00 o'clock, 12 o'clock and 6 o'clock. In the three cases no improvement by looking at beam on ITVGT03 (first viewer) while scanning the solenoid between 10-150 Amps. beam behaved similarly at the four laser positions (including the initial 3 o'clock). |
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* Plan for this week (March 27, 2017): | * Plan for this week (March 27, 2017): | ||
| − | # Monday | + | # Monday - Friday: open in morning to install second part of beamline but close in afternoon to run beam |
| − | # | + | # Week of April 3rd: open all day for beamline bake. Turn ON the extractor gauge in Gun HV Chamber. Use GN2 heater to send 250 C hot gas through the water lines of the FCup to degas. Instrument beamline. |
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| − | * Emittance vs Gun HV: [[media:Emittance_GunHV_3468399.xlsx]] [https://logbooks/entry/3468399] | + | * Emittance vs Gun HV: |
| + | # Mamun at 3 o'clock: [[media:Emittance_GunHV_3468399.xlsx]] [https://logbooks/entry/3468399] | ||
| + | # Yan's Summary: [[media:BeamEmittancevsHV.xlsx]] [https://logbooks/entry/3468623] | ||
Latest revision as of 16:14, 28 March 2017
- Sajini Wijethunga, Comparison of the focal length of the solenoid: media:focal_length_and_emittance.pdf
- Conditioned Gun at 300 kV with solenoid at 0 to 300 A, left to do it at: 325, 350, 375, and 400 A. Two currents, 350 and 400 A, we attempted before but we will repeat.
- Attempting to center solenoid by moving magnet:
- Moved solenoid 1.5 mm to beam left - closer to active area at 3:00 o'clock
- Moved solenoid 3.2 mm (from center) to beam right. In both cases no improvement by looking at beam on ITVGT03 (first viewer) while scanning the solenoid between 10-150 Amps. Beam can be seen on edge of viewer rotating clockwise then drifting towards -45 degrees (lower-right) as solenoid current approaches 150 Amps.
- Magnet was moved back to original center position by S&A. We are waiting on final survey report.
- Attempting to center solenoid by moving active area:
- Moved active area to 9:00 o'clock, 12 o'clock and 6 o'clock. In the three cases no improvement by looking at beam on ITVGT03 (first viewer) while scanning the solenoid between 10-150 Amps. beam behaved similarly at the four laser positions (including the initial 3 o'clock).
- Laser Newport powermeter is now at the exit window side of the gun
- Laser tables are covered
- Plan for this week (March 27, 2017):
- Monday - Friday: open in morning to install second part of beamline but close in afternoon to run beam
- Week of April 3rd: open all day for beamline bake. Turn ON the extractor gauge in Gun HV Chamber. Use GN2 heater to send 250 C hot gas through the water lines of the FCup to degas. Instrument beamline.
- What we are working on now:
- Still trying to center the gun solenoid
- Do we want to keep the anode biased at +280 V all times (and while running beam)?
- Emittance vs Gun HV:
- Mamun at 3 o'clock: media:Emittance_GunHV_3468399.xlsx [3]
- Yan's Summary: media:BeamEmittancevsHV.xlsx [4]
- These are the simulation tasks that we should try:
- Simulate beam rotation at: B=0 G (0 A), B=170 G (50 A), B=340 G (100 A), B=510 G (150 A), B=680 G (200 A), B=850 G (250 A), B=1020 G (300 A), B=1190 G (350 A), B=1360 G (400 A)
- Simulate emittance vs Gun HV