Detectors for Wire Scanners in the LCLS Injection Area

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Meeting Minutes

Minutes from April 4, 2006

Detector Placement

We currently plan to use 11 detectors to instrument the first 7 wire scanners in the LCLS injection area, as shown below. This includes:

• Ion Chambers: 4 in total
• Fast Ion Chambers: 2 in total
• PMTs: 3 in total
• PMTs with Periscope (Air Cerenkov): 2 in total

Detector Instrumentation Requirements

• Ion Chambers require:
  • Gas (such as Argon)
  • High Voltage, typically less than 1.5 kV, but adjustable
  • Charge Integrating ADC
    • Possibly a programmable gate generator
  • All associated cabling
• Photomultiplier Tubes (PMTs) require:
  • High Voltage, typically less than 1.5 kV, but adjustable
  • Bases for electrical connectivity
  • Charge Integrating ADC
    • Possibly a programmable gate generator
  • Shielding from external radiation sources, usually lead bricks
  • In at least one case, a periscope assembly
  • In several cases, support stands which can accommodate the tubes, their bases and the lead shielding.
  • All associated cabling

Test Plan

A test plan for non-beamline testing is forthcoming.

Schedule

The detector schedule will be an integral part of the wire scanner schedule.