Difference between revisions of "GTS meeting 4 04 17"

Latest revision as of 13:32, 17 April 2017

Plans for this week:

Beamline bake with full NEG activation – Done
Degas Faraday Cup – Done
Remove old laser – Done
Put ND filters in front of YAG Screen cameras to prevent camera saturation – Done
Calibrate laser power meter at exit window vs input window – Done
Laser spot walk to make sure spot is round and no clipping – Done
Measure laser size versus laser power – Checked – no dependence on power
Change laser size: x0.5 – Done – now 0.239 mm rms, was 0.525 mm
Grow new photocathode with full active area – Delayed to next week, will run first with existing limited-active area photocathode

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-* Sajini Wijethunga, ''Comparison of the focal length of the solenoid'': [[media:focal_length_and_emittance.pdf]]
+* Plans for this week:
-# Data can be found here: [https://logbooks/entry/3468314] [https://logbooks/entry/3468315]
+# Beamline bake with full NEG activation – ''Done''
-# '''There is an indication of problem with first solenoid'''
+# Degas Faraday Cup – ''Done''
+# Remove old laser – ''Done''
+# Put ND filters in front of YAG Screen cameras to prevent camera saturation – ''Done''
-* 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.
+# Calibrate laser power meter at exit window vs input window – ''Done''
+# Laser spot walk to make sure spot is round and no clipping – ''Done''
+# Measure laser size versus laser power – ''Checked'' – no dependence on power
-* Attempting to center solenoid by moving magnet:
+# Change laser size: x0.5 – ''Done'' – now 0.239 mm rms, was 0.525 mm
-# Moved solenoid 1.5 mm to beam left - closer to active area at 3:00 o'clock
+# Grow new photocathode with full active area – ''Delayed to next week, will run first with existing limited-active area photocathode''
-# 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]] [https://logbooks/entry/3468399]
-# Yan's Summary: [[media:BeamEmittancevsHV.xlsx]] [https://logbooks/entry/3468623]
-* 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

Difference between revisions of "GTS meeting 4 04 17"

Latest revision as of 13:32, 17 April 2017

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