Revision as of 08:46, 17 October 2024

Agenda

MOLLER related Beam Tests: (Note: laser is back to 249.5 MHz, need to switch to low-rep laser (need one shift))
1. Study photocathode effects from KLong beam
2. Deliver Hall D Low-rep Rate and High Bunch Charge Beam to Hall
Hall D Bleed-through:
1. RF bleed-through results from bad RF Separator phasing in Beam Switch Yard. This can be eliminated.
2. Bleed-through that originates at injector because each drive laser produces some dc beam that bleeds across all three chopper slits. We measured bleed-through in injector using different lasers (Mode-Locked laser vs. Gain-Switched lasers, but measured the same level of bleed-through as our gain-switched based drive lasers. All empty RF buckets will be filled with bleed-through currents. Other halls worried about effect on polarization, otherwise no issues. KLong should worry about accidentals and timing. Accelerator wants a requirement document. Bleed-through can be measured in injector. We will need to submit a beam test request. KLong DAQ should also receive a 15.6 MHz timing signal from Injector.

Present:

@@ Line 9: / Line 9: @@
 # Hall D Bleed-through:
 ## RF bleed-through results from bad RF Separator phasing in Beam Switch Yard. This can be eliminated.
-## Bleed-through that originates at injector because each drive laser produces some dc beam that bleeds across all three chopper slits. All empty RF buckets will be filled with bleed-through current. Other halls worried about effect on polarization, otherwise no issues. KLong should worry about accidentals and timing. Accelerator wants a requirement document. Bleed-through can be measured in injector. We will need to submit a beam test request. KLong DAQ should also receive a 15.6 MHz timing signal from Injector.
+## Bleed-through that originates at injector because each drive laser produces some dc beam that bleeds across all three chopper slits. We measured bleed-through in injector using different lasers (Mode-Locked laser vs. Gain-Switched lasers, but measured the same level of bleed-through as our gain-switched based drive lasers. All empty RF buckets will be filled with bleed-through currents. Other halls worried about effect on polarization, otherwise no issues. KLong should worry about accidentals and timing. Accelerator wants a requirement document. Bleed-through can be measured in injector. We will need to submit a beam test request. KLong DAQ should also receive a 15.6 MHz timing signal from Injector.
 *; FLUKA simulations (Pavel)