1. NLC - The Next Linear Collider Project NLC IP Layout What’s New? Tom Markiewicz LC’99, Frascati, Italy October 1999

2. Tom Markiewicz NLC - The Next Linear Collider Project Detector Reference Models from US Linear Collider Detector Collaboration 2m Small detector with 6 T SolenoidLarge detector with 3T Solenoid 6m 1.2 cm 2.5 cm 4T 1.2 cm

3. Tom Markiewicz NLC - The Next Linear Collider Project IR Layout Design Philosophy 20 mrad crossing angle and L*(incoming) = 2 m Maximize transverse space available for incoming and extraction beam optics Maximize separation between IP and point where debris can scatter Compact Low Mass Q1 Magnet Extract beam outside of Q1 Deal with vibration tolerance (  x /  y = 235 nm/3.9 nm) without dictating detector design Support Q1 on piezoelectric mover to adjust position Leave space for active sensor: interferometer or inertial L*(outgoing) = 6 m Leave space for incoming beam optics Conical Mask (M1): Protect detector from backscattered e+e- beam-beam pairs and SR Minimum Angle set by Detector Solenoid Field choice M1 tip location and thickness a detector dependent detail Beam Pipe: r = 1 cm for 1.2 cm VXD inner layer but move away from beam ASAP

4. Tom Markiewicz NLC - The Next Linear Collider Project Small Detector IR Design Knut Skarpaas VIII and Andy Ringwall Detector solenoid coil relatively short, so B Q1  B IP OK for optics (ask PT for details) OK for Q1 Rare Earth Cobalt Q2 magnets sit on extension of tunnel floor Extraction line sits on extension of tunnel floor Q1_SC and Q1_REC sit in cantilevered support tube PT trying to design away need for Q1_SC to be superconducting Q1_SC is OUTSIDE the detector when doors are closed Engineered design of Q1_REC done Q1_REC support scheme developed

5. Tom Markiewicz NLC - The Next Linear Collider Project LCD Small Detector with L* =2m CD1 Optics Plan View M1 M2 Q1Q1-SCQ2 Q1-EXT 10 mrad Support Tube Lum RF Shield -10 mrad Tunnel Wall Beam Pipe

6. Tom Markiewicz NLC - The Next Linear Collider Project IR Layout Details X (cm) Y(cm) Q1 Extraction Beampipe Maximum Radius of Pair Background x-y Distribution of Pair e-,e+ at z = 2 m 1 TeV, 6 Tesla Field Map Pairs deposit ~ ½ Watt DC  10 9 rad/year Plan View - 6 Tesla Detector Pair Energy Monitor Collar

7. Tom Markiewicz NLC - The Next Linear Collider Project Q1: Rare Earth Cobalt (REC) Sm 2 Co 17 or Sm 1 Co 5 Permanent Magnet Smaller mass works better with active vibration stabilization Compact: Not much transverse space available, want to send spent beam outside Q1 No fluids BUT: can REC survive B || (reduces max. pole tip field) and B  (demagnetizes over time)? Looks OK: For small detector B z (2m) < 3 T and B r (2m) < 500 G Materials study planned If a SC Shield magnet is needed, would need to rethink entire layout Q1 SC: SuperConducting Energy tune-ability, aperture @ 500 GeV Self-shielded (second coil) (if IN detector) to not affect the out-going beam Can we engineer this SC magnet away? Q2A & Q2B: Iron Energy tune-ability Outside detector Needs to fit in transverse space allowed by crossing angle and extraction line Q1-EXT: REC Permanent Magnet to minimize space required Final Doublet Magnet Technology Choices Q1 SC Solenoid Shield

8. Tom Markiewicz NLC - The Next Linear Collider Project LC Small Detector Field Map 0 1 2 3 4 5 6 00.511.522.533.54 B z versus z, NLC IR Solenoid 1 Bz, T z, m B z, T L* Uniform Current Density 6 Tesla Coil

9. Tom Markiewicz NLC - The Next Linear Collider Project Accommodation for piezo actuators sensor systems lines of sight for interferometric sensors space for inertial sensors fast feedback electrodes and kickers beam monitoring and physics detectors crab cavity vacuum flanges Detector access issues: Doors that open in z Is a clam shell geometry (open detector in x or y) possible? Detector readout electronics and cable plant Support for weight of masks Assembly/De-assembly plan Efficacy of possible support tube spanning the IP Magnet Space Conflicts IR Hall Conventional Facilities Operating modes: e.g. Push-Pull detectors sharing a hall Engineering Detailing in Progress