IR Working Group Summary

1
IR Working Group Summary

• Tom Markiewicz
• LC RD Workshop, UCSC
• June 29, 2002

2
IR Group People

• NLC Accelerator Physics Group
• NLC Beam Delivery IR Group
• LLNL gg Group
• University Groups
• Oxford University
• U. of British Columbia
• Northwestern University
• U. of Massachusetts

3
-20m lt Issues lt 200m

• Backgrounds
• Simulations
• Final Doublet Magnet Technology
• Vibration Stabilization
• IR Layout
• Instrumentation
• L,E, P Measurements for Physics in Beamline
  Inst. WG
• Vibration Sources measurement modeling
• gg IR Issues

4
One Parallel Session

• Background Update
• Takashi Maruyama / SLAC
• IR Layout RD Status
• TWM / SLAC
• SLC gg Testbed
• Jeff Gronberg / LLNL
• Polarization Measurements at SLC gg Testbed
• Sahal Yacoob / NorthWestern University

5
Background Simulation Results
6
User Files Available

• Direct hits on VXD from 1900 bunches
• /afs/slac/www/accel/nlc/local/systems/beamdelivery
  /guinea_pig/ver_1999_07_08/nlc500h/pairs/
• LD_direct
• SD_direct
• Need discussion with relevant groups to determine
  best way to transfer results on secondary charged
  particles, photons neutrons
• Results of GEANT or FLUKA runs
• Normalized, parameterized energy spatial or
  angular distributions?

7
Beamline Collimators Synchrotron Radiation
107 Halo left after E_Slit
IP
Oct Off
Oct On
100
10
850mm
400mm
E_Slit
Collimation DepthWas 8sx x 40syNow 19sx x
52sy
Spoilers Absorbers
8
Inertial Vibration Stabilization Projects

• New Sensor
• under construction
• Simple 3m pseudo-magnet test
• Parameters parts defined
• Relative motion of two blocks
• Wait for new sensor retest of single block

9
IP Girder Test Concept
4.5m
.5m
7m

• Support tube (Carbon fiber?)
• Permanent magnet or model
• Interaction with external solenoid field
• Hard or soft actuators
• Beam pipe vacuum

7m
10
LCD-L2 (3T) with 3.8m L OpticsSnowmass 2001
52 mrad Cal acceptance
32 mrad M1 acceptance
Calorimeter
SF1
QF1
M2
M1
SD0
QD0
Feedback BPM Kicker
6.3 mrad Lum-Mon acceptance
Low Z shield
Beampipe
Pair LumMon
1 mrad exit aperture
Support Tube
11
Current IR Thinking
117 mrad Cal acceptance
36 mrad M1 acceptance
M2
M1
25 cm radius support tube
12
Final Doublet Magnet Technology
Magnet Aperture Gradient Rmax Z_ip Length
QD0 1.0 cm 144 T/m 5.6cm 3.81 m 2.0m
QF1 1.0 cm 36.4 T/m 2.2cm 7.76 m 4.0 m
13
Photon Collider Testbed HardwareOptical Assembly
½ scale version of the NLC design Position of
final quads in SLC sets the scale
Final focus optics are fixed Steering mirrors are
on piezo movers

• Unknown factor Optics damage
• IP cannot often be opened up to fix the optics
• Radiation damage to the coating
• Laser power damage to the mirrors
• What is the MTBF?

14
Engineering Test Facility at SLC
Beam Energy DR g?x,y (m-rad) FF g?x,y (m-rad) ?x
/ ?y ? z ?x,y N?
30 GeV 1100 / 50 1600 / 160 8 / 0.1 mm 0.1 1.0
mm 1500/55nm 6.0E9
15
Photon Collider Testbed Hardware ½ Scale
prototype of optics / alignment system is
currently under construction
Beampipe
Alignment System
16
Concluding Statement

• There are many tools resources that have been
  developed already by NLC sponsored Machine
  Detector Interface group
• Transfer of tools projects to fresh faces would
  help project and provide a relatively easy way
  into the accelerator RD world for interested
  groups or individuals