Difference between revisions of "Alternative readout"

Revision as of 09:46, 9 June 2008

Options for readout of the Bcal using existing technologies

• Readout of the barrel calorimeter based on conventional photomultiplier tubes (GlueX-doc-832, Jun 2007)
• Issues that need to be considered (rough outline)
  1. light guides and collection
     • fiber light guides? re-evaluation of the granularity for the inner cal
  2. light detector
     • planacons, wire mesh pmts
  3. magnetic fringe fields / shielding
     • Preliminary field calculations using ANSYS available
  4. cabling / number and sizes of cables / signal degradation
     • cable differences between various detectors, e.g. HV
  5. dark box / "wrapping of detector"
     • presently no scheme has been worked out for any scenario
  6. impact on photon reconstruction [what is our current geometry?]
     • what material is included for the WCs/SiPMs/cables?
  7. cost estimates
• Comments:
  • Area of fibers cover 50% of the area of the end of the Bcal. Reduction is 2.
  • Area of the output of the WC (1.2 cm2) reduces the readout by 4cm2/1.2cm2 = 3.3.

• The Sketch below is to illustrate the space constraints for any light collection and readout system: