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Compton Electrons Jeff Martin University of Winnipeg.

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Presentation on theme: "Compton Electrons Jeff Martin University of Winnipeg."— Presentation transcript:

1 Compton Electrons Jeff Martin University of Winnipeg

2 Struck electron loses energy equivalent to photon energy increase. Very little angular deflection. At 850 MeV, max energy loss is E  = 25 MeV [Bates]. Struck electron is momentum analyzed using downstream dipole magnet. Compton Recoil Electron Kinematics e.g. Mainz Compton

3 Compton Survey (focusing on electron detection) LocationBeam energyPhoton Det.Electron Det. Hall A1.0 – 6.0 GeVPbWO 4 silicon Mainz0.1 – 0.9 GeVNaISciFi SLAC45.6 GeVW / quartzPb / gas Č HERA Long.27.5 GeVNaBi(WO 4 )none Bates0.3 – 1.0 GeVCsInone others: NIKHEF, VEPP-3, VEPP-4, SPEAR, CESR, DORIS, PETRA, HERA trans., LEP

4 Typical Requirements for Electron Detector (Mainz & Hall A) ~ mm spatial resolution in dispersive direction high efficiency (no gaps) high rate capability (up to 100 kHz) rad hard Notes: Both Mainz & Hall A use CW laser operation (we don’t intend to) background rates highly dependent on energy and beam tune [Nanda, Hall A]

5 Technologies Under Consideration for Hall C Compton Silicon –advantages: proven technology (Hall A), acceptance easy to understand, rad hard. –disadvantages: slow? potentially high electronics costs. SciFi –advantages: fast, cheap, use Si-PM readout –disadvantages: rad hardness? more difficult acceptance? –alternate: quartz fiber; same readout, very rad hard. GEM –advantages: cheap, rad hard, fairly fast. –disadvantages: electronics costs hard to estimate, potentially complicated R&D project on its own.

6 Si cost estimate (C. Davis, et al 2005 NSERC submission) ItemCost (kCAD) Si detectors (8 x PIPS-S-8)44 Electronics @ 192 channels82 Cooling8 Misc2 Travel10 Total146 Note: RTI category 1 limit is $150 kCAD.

7 Roadmap to First Light Decide technology ASAP –Base decision on: rates (signal and background) granularity (guess similar to Hall A and Mainz?) fiducializability? –Current favorite: …? Input from collaboration/experts? Begin detailed budgeting for upcoming grant cycles –NSERC: deadline end of Oct. –DOE: deadline Nov. –Need ideas on how to split tasks (MSU vs. UWpg/Canadians) Detailed simulations – decide position wrt chicane dipoles. Prototyping Receive funding Build it

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