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Beam optics for energy, pol measurements [message #160] Wed, 24 November 2004 23:03
Messages: 12
Registered: November 2004
Location: SLAC
Comments on some SLAC work towards developing beam optics for energy and polarization measurements:
  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 sketch).
  3. Next, Yuri will work on 2-mrad extraction line, initially with no beam diagnostics. (Later we can worry about adding 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, 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 sketch). 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 and can come later.

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