1 / 7

Compton Electrons

Compton Electrons. Jeff Martin University of Winnipeg. Compton Recoil Electron Kinematics. Struck electron loses energy equivalent to photon energy increase. Very little angular deflection. At 850 MeV, max energy loss is E  = 25 MeV [Bates].

devaki
Download Presentation

Compton Electrons

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Compton Electrons Jeff Martin University of Winnipeg

  2. Compton Recoil Electron Kinematics • 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. e.g. Mainz Compton

  3. Compton Survey(focusing on electron detection) others: NIKHEF, VEPP-3, VEPP-4, SPEAR, CESR, DORIS, PETRA, HERA trans., LEP

  4. Typical Requirements forElectron 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) 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

More Related