Collimation and tagging instrumentation

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Presentation transcript:

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

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. 24-27, 2012 Eg (GeV)

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. 24-27, 2012

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. 24-27, 2012

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. 24-27, 2012

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. 24-27, 2012

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. 24-27, 2012

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. 24-27, 2012

Active collimator data sweep collimator horizontally across beam, observe raw currents on wedges APS/DNP meeting, Newport Beach, Oct. 24-27, 2012

Active collimator data near the aperture look at asymmetry raw offsets not removed gain ~ 15% / mm centered at 14.28 cm Vright– Vleft Vleft + Vright APS/DNP meeting, Newport Beach, Oct. 24-27, 2012

Active collimator data electronic noise is negligible raw asymmetry signal: moving through beam out of beam APS/DNP meeting, Newport Beach, Oct. 24-27, 2012

Active collimator data results @ 60nA amplifier bandwidth beam noise floor: readout noise floor 18 mm @ 600Hz 3 mm @ 600Hz beam noise floor scaling to 0.6nA readout noise floor digitization noise floor 130 mm @ 120Hz APS/DNP meeting, Newport Beach, Oct. 24-27, 2012