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MSD apertures

MSD apertures. Assume new vacuum chamber possible in last 5 MSD (all MSDCs), with r=26.2mm (increase of 2mm wrt standard version). Assume ±4mm orbit for circulating beam to be respected. Derive apertures for circulating and extracted beams. TCDS position.

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MSD apertures

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  1. MSD apertures • Assume new vacuum chamber possible in last 5 MSD (all MSDCs), with r=26.2mm (increase of 2mm wrt standard version). • Assume ±4mm orbit for circulating beam to be respected. • Derive apertures for circulating and extracted beams.

  2. TCDS position • Place TCDS at 16.3 (±1.0) mm which corresponds to n1 = 6.5 for ±4mm orbit

  3. MSDC position

  4. MSDC aperture • Have n1 = 7.1 for ±4mm orbit at tightest point (and shielded to >2s for sweep case)

  5. Extracted beam aperture • Centre beam in extracted gap for orbit of ±2mm (ie feedback OK) • Nominal kick 0.269mrad • Derive apertures as function of orbit for 15/15 and 14/15 kicker cases for 450GeV and 7TeV

  6. Extracted beam aperture

  7. Conclusion • Enlarged chamber in MSDCs allows: • nominal kick 0.269mrad for MKD • n1 >6.5 for ±4mm circulating beam orbit • ~5.7/23 sigma for extracted beam at 450 GeV/7 TeV respectively (15/15 MKD, 2mm orbit) • ~3/12 sigma for extracted beam at 450 GeV/7 TeV respectively (14/15 MKD, 2mm orbit)

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