Progress in BDS

1
Progress in BDS

• Andrei Seryi
• for the BDS group
• June 6, 2005
• 130 Monday Meeting
• (The previous summary was shown on April 18, 2005)

2

• Real magnets for FF and extraction, for 2mrad IR
• Scale models of larger aperture QD0, (B.Parker)
• Consideration of large apertureSD0, (V.Kashikhin)
• IR design with real magnets and BPMs
• adjusting SiD concept to match (T.Maruyama,
  T.Markiewicz, J.Jaros, et al.)
• need to work with other detector concepts groups
• Short FD FF/extraction optics design for 2mrad
• reoptimized 2mrad for 250GeV/beam with short FD,
  US-UK team (D.Angal-Kalinin, et al. for UK)
• Beam dump design
• Started consideration of the dump for ILC
  parameters (L.Keller,D.Walz,E.Doyle)
• Collimation performance and optimization of
  collimation optics is ongoing (S.Drozhdin,
  L.Keller, M.Kostin, et al.)
• Beam losses and performance vs parameter range
  (Y.Nosochkov,T.Maruyama)
• Tune-up dump design (M.Woodley)
• Design of post-ip diagnostics for 2mrad
  (K.Moffeit,M.Woods,Y.Nosochkov)
• ESA preparation (R.Arnold,M.Woods)
• Conventional facility design (F.Asiri et al.)
• BDS feedback and jitter specs (L.Hendrickson,G.Whi
  te)
• Solenoid effect on extraction (Y.Nosochkov)
• E-cloud in BDS and beam-beam (J.Wu)

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SLAC-BNL-UK-France Task Group
2mrad IP Extraction Line in Geant
BYCHIC
Shared Large Aperture Magnets
Disrupted beam Sync radiations
QEXF1
SF1
QF1
SD0
QD0
60 m
Beamstrahlung
Incoming beam
No beam g losses for nominal parameters
pocket coil quad
Super Septum Quad B.Parker et al.) or
Rutherford cable SC quad and sextupole
Warm Panofsky septum quad (C.Spencer)
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Bretts scaled model of QD0
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20 mrad IR vs 2 mrad IR

• Disrupted beam losses on SC elements limit
  performance
• Preliminary Better detector hermeticity of 2mrad
  IR comes together with lower luminosity reach
• Optimization of design and evaluation will
  continue

6
Short FD for 2mrad
Long FD for 2mrad
7
Expected achievements from BDIR Wkshp., draft

• For the BDIR/WG4 topics, after the London BDIR
  workshop, it is expected that the following will
  be achieved
• Discuss and agree on what to bring to Snowmass,
  in terms of further development of the design,
  between London and Snowmass
• Outline the document(s) to be written for
  Snowmass
• Define milestones and people who are doing the
  work
• Examine the status of the BDS designs with 20 and
  2mrad IR, and any possible alternatives
• Reaffirm that the present configuration of BDS
  with 20/2mrad is the main baseline
• Agree on optics decks for 20/2mrad with the goal
  of fixing these by when ... How about
  Bastille day, July, 14th
• Agree on comparison/benchmarks for the design.
• For the ATF2, it is expected that we completed
  the proposal document, and discussed the next
  steps toward the ATF2 collaboration.