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Considerations for Energy, Polarization Diagnostics [message #168] Thu, 02 December 2004 16:05
Messages: 12
Registered: November 2004
Location: SLAC
(This message was initially posted to the MDI Workshop forum/topic on Nov. 24)

  1. At the KEK Workshop, WG4 decided to develop a complete Beam Delivery System including 2 IRs, one with a 20-mrad crossing angle (to be evaluated in range 12-25 mrad) and one with a 2-mrad crossing angle (to be evaluated in region 2-7 mrad).
  2. At SLAC Yuri Nosochkov is working on the 20-mrad extraction line design, which includes separate energy and polarimetry chicanes (see 8dec2004/20mrad_extline_diagnostics.jpg).
  3. Next, Yuri will work on 2-mrad extraction line, initially with no beam diagnostics. (If this is successful with acceptable beam losses, will later look into adding E,P diagnostics).
  4. Upstream BDS for 2-mrad needs to include E,P measurements. For a strawman design, I propose we use the 4-magnet chicane described by Ray Arnold on slide 6 of his Nov. IPBI presentation (see 3nov2004/Chicane_Issues.pdf This energy chicane needs to go downstream of the energy collimation. For polarimetry Ken Moffeit and I propose as a strawman to duplicate roughly (larger separation between middle 2 magnets) the energy chicane design for a polarimeter chicane, but locate upstream of the energy collimation (see 8dec2004/Pol_Chicane_Upstream.jpg). Also, want beam trajectory at middle of polarimeter chicane parallel to IP (though chicane also allows possibility for using the chicane to match the trajectory).
  5. Upstream BDS for 20-mrad. Would prefer this to include similar energy and polarimeter chicanes as the 2-mrad BDS. But this is lower priority in SLAC studies and will be investigated later.

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