1. Alan Fisher APE Meeting 2010-09-21
Beam-Loss Monitors
Alan Fisher
APE Meeting

2. Cherenkov BLMs for PEP-II

3. Argonne BLMs
Argonne borrowed a PEP BLM, then made their own version for APS
Later, another version for LCLS
Surrounds the beampipe with a Y-shaped fused-silica Cherenkov radiator
Ran out of money after building 5
Put on every 8th girder
Put recycled PEP-II BLMs on all 33 girders
Now they’ve completed BLMs for all girders
Being installed this week

4. Sketch of Argonne BLM on Girder

5. Simulations performed with RIBO Monte Carlo code
Nonuniform Response
Simulations performed with RIBO Monte Carlo code
RC = 0.95
RC = 0.96
RC = 0.97
0.10
0.08
0.06
0.04
0.02
0.60
0.40
0.20

6. Block the Stem with Lead

7. Lead-Brick Test at 13.6 GeV