Machine Detector Interface Design Updates Tom Markiewicz SLAC 21 June 2005

Information Management Challenge Multiplication of active stakeholders and true globalization in all areas of the project has increased the need for vigilance and communication Detector Groups Accelerator Physicists Engineering Groups This talk meant to highlight some of the “discoveries” recently unearthed in context of weekly US BDIR meeting Not comprehensive Spirit of discussion: need to learn what is happening in other regions/groups and have plan for configuration documentation

May05 Release (previous xml file was dated Mar01) Si Detector May05 Release (previous xml file was dated Mar01) http://confluence.slac.stanford.edu/display/ilc/sidmay05 VXD Layout with Forward VXD Tracking lead to change in Beam Pipe Radius at IP 10mm  12mm Collimation depth, etc. Move Endcap ECAL start from 1.85m to 1.68m Shielding from pair backgrounds changes, given fixed L* Increase thickness of Endcap Iron from 2.08m to 3.12m and refine layout of SC coil package new field map is needed in for final doublet region Small refinements in tracker & calorimeter layers Independent from BDIR / MDI concerns Desire to not be identified with any one IR layout Modify GEANT, CAD programs to independently pick & choose IR layout & detector LD and HD We lack local knowledge and want to be educated

Accelerator & Engineering Issues Affecting Location of LumMon & Radial Size Required for Final Doublet Accelerator 20mrad Desire to have 1st extraction quad at L* recreates space crunch Previously, L*(ext) = 6m (8m, 16m) Any qc Antisolenoid for QD0 not yet integrated in any detector design Engineering SC Magnets Longitudinal space for cold to warm transitions Radial cryostat size and location of cold mass within cryostat Instrumentation Size of and space for feedback BPM and kicker system Missing Sorely need a 0th order engineering cartoon allowing for vacuum, cables, supports, adjustment, repair access, etc.

VXD / Beam Pipe Tweaked for SiD Maruyama Old SiD VXD with 10 mm radius beampipe New SiD VXD with 12mm radius beampipe Pair region plotted for ILC Nominal IP Parameters 5 Tesla, 20 mrad Pair region plotted for NLC IP Parameters 5 Tesla, 20 mrad

SiD Yoke edge, width & Coil r, L changed relative to L* May 2005 March 2001 Yoke Yoke Coil Coil HCAL HCAL ECAL L* ECAL L*

20 mrad MDI Changes April 2004 May 2005 Kicker moved C-W X X-line moved BPM Beampipe coned to for better FT L*

20 mrad MDI Changes Lum moves 20cm toward IP to create 10cm for BPM and 10cm for Warm-Cold Transition Probably need 20cm for C-W X but did not want to need to repeat background studies until changes to L* considered Ecal moves 17cm toward IP Net reduction of 3cm shielding of Lum face by detector Conical beam pipe to increase FT acc. Explicit change in pix from permanent magnet model with sizes set by Hallbach equations to BNL compact SC model with cold mass and cryostat model set by B. Parker et al. L*(extraction) now = L*(incoming) May 2005

Anti-solenoids 15T Force 316mm 456mm Reminder: A. Seryi & Y. Nosochkov showed (PRSTAB 8, 021001 (2005)) If QD0 sits in Fringe of Detector Solenoid sy(Solenoid) / sy(0) ~ 30-40 Independent of crossing angle 70mm cryostat 1.7m long 15T Force 316mm Four 24cm individual powered 6mm coils, 1.22m total length, rmin=19cm 456mm sy(Solenoid) / sy(0) ~ 1.4

Previous GEANT model of 2 mrad Extraction embedded in Si D Support tube R = 17 cm BYCHIC Disrupted beam & Sync radiations QEXF1 SF1 SD0 QF1 QD0 60 m Beamstrahlung Incoming beam Large aperture SC magnets: QD0:  = 9 cm SD0:  = 19 cm SF1:  = 26 cm

Estimation of Cryostat to hold QD0 LHC IR quadrupole Parker’s scaling Rcryostat = 21 cm for  = 9.0 cm

New 2mrad GEANT Model in SiD r=21 cm QD0 26 cm antisolenoid What is the structure and length of the warm-cold transition? 10 cm may not be enough for large diameter. Location of cold mass within cryostat? Cryostat flanges, etc. which may influence “hoop size” ? What about SD0 and SF1? QD0

Summary I’m sure I am “preaching to the choir” regarding need to iterate & consolidate these kinds of information I’m sure we will hear much more at workshop

Final Doublet Magnet Design Successful tests of winding 7-wire cable at 10mm radius beampipe & Use of SF (1.9°K) He-II Lead to MORE COMPACT COIL CONFIGURATIONS and open up NEW design options B. Parker Ultra-Compact Design w/ Radial Taper in 3 z-steps 2004 SC QD0 Design Single-strand at r=10mm 7-strand at r=20mm New 20 mrad X-ang design has QD0 AND 1st Extraction Quad at same L* in separate cryostats

gg accommodated within 20 mrad B. Parker Straw-Man Configuration Discussions on Merits/Risks of 25mrad continue 76mm = ±10mrad around extraction line Outer Quad and Dipole Zero By at both +10mrad and -10mrad 76mm beam separation at 20 mrad COILS at IP Side of QD0 at z=3.8m