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New BDS Production Deck BDS9801
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Conclusions: (good news) New BDS Deck (BDS9801) almost ready for release. Quad ... Conclusions (ugly news) Need revised collimation region (no passive survival) ... – PowerPoint PPT presentation
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Title: New BDS Production Deck BDS9801
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 gt 8 mm
- Transitions mixed 1.2cm/1.0cm quad bores risky
- Uniformity of Quad Apertures
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Changed quads/sexts to minimum 1.2 cm full bore
- 40 quads with Bpole gt 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 gt 7 kG -- longer?
4
2. IP Switch/Separator
- IP separation gt 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
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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)
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IP Separator Solution
- Both beamlines pass through IPSW1
- IPSW quad 2 post-IPSW quads common (move
cms) - Long BDS contains 5 new quads, 2nd IP SW 2nd
match into Big Bend
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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?
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Conclusions (good news)
- New BDS Deck (BDS9801) almost ready for release
- Quad bores expanded
- IP Separator Beamline included
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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)
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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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