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Collimation and tagging instrumentation

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Presentation on theme: "Collimation and tagging instrumentation"— Presentation transcript:

1 Collimation and tagging instrumentation
APS/DNP meeting, Newport Beach, Oct 24-27, 2012 Collimation and tagging instrumentation for the GlueX photon beamline Richard Jones Igor Senderovich, Anne-Marie Carroll University of Connecticut

2 Coherent Bremsstrahlung
Beamline Overview Top View 75 m Tagger Area Experimental Hall D Electron beam / dump Coherent Bremsstrahlung photon beam Solenoid- Based detector Collimator Photon Beam dump Counting House Radiator Pair Spectrometer Collimator Cave Tagging Spectrometer Beam contains both coherent and incoherent components. Only the coherent component is polarized. Collimation suppresses incoherent part. no collimator with collimator intensity (/GeV) APS/DNP meeting, Newport Beach, Oct , 2012 Eg (GeV)

3 Tagging spectrometer focal plane hododscope 500 scint. fibers
post-bremsstrahlung electrons 12 GeV electrons crystal radiator 500 scint. fibers 2mm x 2mm SiPM readout 3MHz rate/fiber st = 200ps APS/DNP meeting, Newport Beach, Oct , 2012

4 photon beam collimator
Photon collimator photon beam collimator (75m downstream) 12 GeV electrons crystal radiator 3.4mm aperture photon “spot” ~5mm RMS 15% power transmission shielded alcove APS/DNP meeting, Newport Beach, Oct , 2012

5 Collimator requirements
dynamic range resolution bandwidth robustness 0.5 nA – 5A 200 m RMS > 60 Hz dx < 200 mm radiation hard stable gain reliable APS/DNP meeting, Newport Beach, Oct , 2012

6 Collimator design Tungsten pin-cushion design
tungsten plates Tungsten pin-cushion design Miller and Walz, NIM 117 (1974) 33-37 measures current due to knock-ons in EM showers tungsten pins charge asymmetry comes from high-energy delta rays “knock-ons” e- incident gamma e+ beam tungsten pin cushion insulating support 12 cm APS/DNP meeting, Newport Beach, Oct , 2012

7 Beam test – April 2011 prototype detector installed in Hall B
photon dump area Brendan Pratt James McIntyre Igor Senderovich +Alex Somov, Hovanes Egyan APS/DNP meeting, Newport Beach, Oct , 2012

8 Run conditions beam energy: 3.36 GeV current: 15 nA, 60 nA
precollimator: 2.6 mm radiator: 10-4 radiation lengths, gold stability – very good sampling frequency 333kHz APS/DNP meeting, Newport Beach, Oct , 2012

9 Active collimator data
sweep collimator horizontally across beam, observe raw currents on wedges APS/DNP meeting, Newport Beach, Oct , 2012

10 Active collimator data
near the aperture look at asymmetry raw offsets not removed gain ~ 15% / mm centered at cm Vright– Vleft Vleft + Vright APS/DNP meeting, Newport Beach, Oct , 2012

11 Active collimator data
electronic noise is negligible raw asymmetry signal: moving through beam out of beam APS/DNP meeting, Newport Beach, Oct , 2012

12 Active collimator data
60nA amplifier bandwidth beam noise floor: readout noise floor 18 600Hz 3 600Hz beam noise floor scaling to 0.6nA readout noise floor digitization noise floor Hz APS/DNP meeting, Newport Beach, Oct , 2012

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