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Enhancements in BDS Production Deck: Magnet Revisions and IP Separator Design Insights

This document discusses critical updates to the new BDS Production Deck (BDS9801), focusing on magnet revisions and the IP separator design. Key revisions include adjustments to magnet bore sizes and the introduction of quad apertures to improve beam uniformity. The design constraints for the IP separator are outlined, emphasizing the need for effective diagnostics and beamline separation. The conclusions highlight the readiness for release of the new deck while noting challenges related to quad strength and chromaticity control that require further attention.

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Enhancements in BDS Production Deck: Magnet Revisions and IP Separator Design Insights

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  1. New BDS Production Deck -- BDS9801 PT, 26-October-1998 “Path that ever Promise made Desire dream dissolve and fade”

  2. 1. Magnet Revisions Why Revise any of the Magnets? • Vacuum: Magnet bore > 8 mm • Transitions: mixed 1.2cm/1.0cm quad bores risky • Uniformity of Quad Apertures

  3. Changed quads/sexts to minimum 1.2 cm full bore: • 40 quads with Bpole > 6.7 kG (20 in final focus, 3 cm full bore) • 6 quads with Bpole 10-11 kG, all in pre-collimation diagnositcs • Bends need no revision • Sexts: 2 with Bpole > 7 kG -- longer?

  4. 2. IP Switch/Separator • IP separation: > 200 m in z • One beamline (“Short BDS”) bends at IPSW, other goes straight to second IPSW module • IPSW = 100 m, so need 100-200 m Separator beamline

  5. Design Constraints of IP Separator Design • Both beamlines pass through IP Switch # 1 -- for IP 2, bends are turned off + Degaussed! • IP 2 line should contain second IP Switch for energy diagnostics • Dfx,y = np between 2 lines (collimation)

  6. IP Separator Solution • Both beamlines pass through IPSW1 • IPSW quad + 2 post-IPSW quads common (move ~ cm’s) • “Long BDS” contains 5 new quads, 2nd IP SW + 2nd match into Big Bend

  7. IP Separator Soln (contd) • Total added phase advance = 2p in x and y, Dz = 287 meters • A few quads and bends in short BDS must be moved out of way • Optically solution is marginal: (Dsx,Dsy) = (0.5%,2%) --chromaticity?

  8. Conclusions: (good news) • New BDS Deck (BDS9801) almost ready for release • Quad bores expanded • IP Separator Beamline included

  9. Conclusions (bad news) • Many quads too strong for 1.5 TeV CM; some bad for 1 TeV • IP separator design requires several shifts for IP switchover • Separator chromaticity requires IPSW/BB sexts (needed anyway)

  10. Conclusions (ugly news) • Need revised collimation region (no passive survival) • Need IPSW/BB sextupoles • Need to try longer, weaker IR quads

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