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IPBI 6 April 05Ken Moffeit Polarimetry Design Updates - Dispersion in upstream chicane - 20mrad extraction line 0.75 mrad beam stay clear location of Synchrotron.

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Presentation on theme: "IPBI 6 April 05Ken Moffeit Polarimetry Design Updates - Dispersion in upstream chicane - 20mrad extraction line 0.75 mrad beam stay clear location of Synchrotron."— Presentation transcript:

1 IPBI 6 April 05Ken Moffeit Polarimetry Design Updates - Dispersion in upstream chicane - 20mrad extraction line 0.75 mrad beam stay clear location of Synchrotron Radiation Stripe Detector Comments about Shielding Number of Cells for Cerenkov Detector Better R22 etc - 2mrad extraction line R22 issues Energy and Polarimeter Chicanes - aligning the Compton IP Comments about surveying and tolerance for direction at Compton IPs. IPBI Meeting 6 April 05 Ken Moffeit

2 IPBI 6 April 05Ken Moffeit Upstream Polarimeter with Dispersion = 5 mm

3 IPBI 6 April 05Ken Moffeit Dispersion 5mm > 20mm  2 is 16 times larger R(20mm) = R(5mm)/4 R 3 (20mm)= R 3 (5mm)/32 Emittance(20mm) = 4 5 Emit (5mm) Slide from Ray Arnold Upstream Polarimeter Emittance Growth versus Dispersion

4 IPBI 6 April 05Ken Moffeit Emittance Growth versus Dispersion Horizontal Emittance Growth Chicane Dispersion (mm) Mark Woodley 0 10% 20% 30% 0 10 20 For eta=20mm & 500 GeV beam: Short bend has pole- tip field of 5.4 kG; Long bend is half of that. Magnets ok for higher dispersion.

5 IPBI 6 April 05Ken Moffeit Upstream Polarimeter with dispersion = 10 mm

6 IPBI 6 April 05Ken Moffeit Space for Laser Beam Insertion/exit Only 1.4 meters between the inner dipoles is unacceptable. Peter Schuler needs a nominal 8 meters of space (or 14 meter between magnet centers) for the laser beam insertion/exit. This is to accomodate a crossing angle of 10 mrad, and keep the optics away from any synchrotron radiation. These conditions accomodate a vertical beam crossing, but retain a minimal magnet gap height of only 20 mm for all dipoles.

7 IPBI 6 April 05Ken Moffeit 10 mm dispersion and 8m for laser input

8 IPBI 6 April 05Ken Moffeit 20 mrad Extraction Line Eight Cerenkov Cells 1 cm wide Six cover the region between 36 GeV (12 cm from beam line) 25.1 GeV (17.8 cm) And 2 outside the kinematic limit Location of Synchrotron Detector Cerenkov Detector Shielding issues: Cells closest to beam pipe will see Synchrotron Radiation (below 10 MeV?)

9 IPBI 6 April 05Ken Moffeit LCWS Mar 05 Yuri Nosochkov Original Optics Improved R22 Optics bad Good

10 IPBI 6 April 05Ken Moffeit Yuri Nosochkov (5 April 05) Most Recent Optics LCWS Improved R22 Optics Good Not Good > Lose 1cm at Cerenkov Det 1 st Cell starts at 13 cm instead of 12 cm 2 mrad synchrotrotron swipe barely gets out of 0.75 mrad beam stay clear

11 IPBI 6 April 05Ken Moffeit 2mrad extraction line R22 issues Energy and Polarimeter Chicanes Optics Improvement R22 ~ 1.3 now Need R22 ~ 0.5 Expand 2 mrad section to include Energy chicane Polarimeter chicane

12 IPBI 6 April 05Ken Moffeit Aligning the Compton IP Precision surveying should be good to <50 micro radians Can precision gyroscopes be used to achieve better accuracy? Perhaps <25 micro radians

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