Minutes-6-23-2016
From GlueXWiki
June 23, 2016 Transition Radiation Detector meeting
Recent TRD reports at the GlueX collaboration meeting
Prototype: requirements and very preliminary design
- Requirements:
- Use existing FDC pre-amps, fADC125, connectors, cables
- Wires and strips at 90 deg.;
- One 24-channel pre-amp for the wires and one pre-amp for the strips.
- Active area sizes:
- 240 mm across wire direction: sense wire pitch of 10 mm
- 120 mm across strip direction: strip pitch of 5 mm.
- Field wires in between sense wires with 10 mm pitch.
- 20 mm drift gap
- Max drift time < 3 microseconds (to be used within the standard GlueX DAQ):
- +2kV on sense wires, -500V on field wires, -1.4kV on the upstream cathode, downstream cathode (with strips) on ground Garfield field/drift time simulations
- Adding additional cathode separates the drift and amplification volume and allows to set independently drift velocity and gas gain Garfield simulations, track example
- Xe/CO2 70/30 gas
- Upstream cathode made of aluminized Mylar - critical to minimized keV-photon absorption
- Radiator in front up to 150 mm thick - good to have it in a separate gas volume flushed with CO2, also to keep the upstream cathode flat and insulated.
- Detector schematic
- Brian's design
