Star Barrel EMC Update

1
Star Barrel EMC Update

• Stephen Trentalange
• UCLA
• January 18, 2003

2
Tower Timing Curve
3
Installation for 2003
EMC 50 Installed 60 EMC Modules Installed All
PMT Boxes All Electronics 60 SMD Modules
Installed All Electronics Level Zero Trigger
Installed High Tower Jet Patch
4
Installation for 2003

• EMC Dead Channels
• 2400 PMTs 32 Uncalibrated (bad electronics)
• 3 Dead (bases or phototubes)
• SMD Dead Channels
• 1800 wire pairs 8 Broken wires 6 repaired-gt 2
  new
• one reset
• one module HV off Module 5
• Problem with Field Ramp
• and Beam Dump?

5
Calibration Data Dedicated Run
Adjust Voltages to Compensate For Variation of
Gain with Eta Uniformity of Trigger.
Mip Peak Used for Relative Energy Calibration.
6
PMT Gain Equalization
7
Planned Gain Adjustment
Desired Gain
8
High Tower Trigger
Problems
9
Commissioning Tasks

• Energy calibration with new PMT Voltages
• SMD Readout Problems
• SMD Timing
• Commission High Tower and Jet Triggers