IR Working Group R

1
IR Working Group RD Projects

• Tom Markiewicz
• LC RD Workshop, UCSC
• June 30, 2002

2
-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

3
Background Projects

• Iterate all results for consistent set of results
• Beam parameters, detectors, solenoid design,
  beamlines not consistent
• Detector response to known backgrounds
• TPC, Cal, Lum, Pol, etc.
• Dose calculations on SC or REC QD0
• Collimator scattering study
• Locations, apertures, beam loss,
• GEANT4 beamline model
• gg-Hadron production

Experts Takashi Maruyama/SLAC Lew
Keller/SLAC Jeff Gronberg/LLNL Stan
Hertzbach/U.Mass
4
Simulation Projects

• At SLC/SLD LUMINOSITY and BACKGROUNDS dominated
  EXPERIMENTAL daily concern
• I am sure last factor of 10-100 will be a
  struggle at the next LC
• There are an infinite number of Monte Carlo-like
  studies that can be made to understand luminosity
  loss mechanisms and ways to ameliorate them.
• Repeat background studies for real machine with
  non-ideal alignment, magnet settings, ground
  motion,
• Tolerance parameter study

Experts Peter Tenenbaum/SLAC Andrei Seryi/SLAC
5
Final Doublet Magnet Technology
6
Magnet RD Topics
Experts Andy Ringwall/SLAC-PEP3 Brett Parker et
al/BNL Kumada / NIRS (Japan)

• Permanent
• Radiation hardness
• Temperature sensitivity
• Tuning schemes
• Effect of solenoid fringe field BZ, BR, FZ
• Incorporate beam pipe vacuum system
• Superconducting
• Temperature load from ee- pairs, SR, leads,
  support
• Field stability appropriate sensor
• Flowing Helium
• External connections
• Mechanical rigidity against vibration
• Vibration sensors / actuators appropriate inside
  / outside cryostat

7
Realistic IR Layout

• Masking Support
• VXD support alignment
• Instrumented Masks
• Lum_Pair Mon
• Vacuum req.
• REC QD0
• SC QD0
• Beampipe support
• Apertures
• Optical lines of sight
• Detector access

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 single block

Experts Joe Frisch/SLAC Linda Hendrikson/SLAC Tom
Himel/SLAC Eric Doyle/SLAC Leif Ericksson/SLAC
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
Interferometric Vibration Stabilization
Experts Tom Mattison/UBC Mike Woods/SLAC Joe
Frisch / SLAC
Platform Displacement Sensor Value
11
IP Feedback Projects

• NLCTA Improvements
• Better beam conditions
• Better hardware, DAQ,
• Solid State Kicker
• Other sites
• ATF (KEK)
• PePII

Experts Phil Burrows/Oxford Gavin
Nesom/Oxford Simon Jolly/Oxford Glenn
White/Oxford Colin Perry/Oxford Joe
Frisch/SLAC Steve Smith/SLAC
12
Photon Collider Testbed Hardware ½ Scale
prototype of optics / alignment system is
currently under construction
Beampipe
Alignment System
13
gg IR Projects

• Mercury Laser Project
• Fusion RD, comes for free
• IR Optics
• ½ NLC Scale, suitable for LINX/SPHINX is being
  built
• Test laser beam diagnostics and control with low
  power laser
• Beam Tests
• Laser?
• BeamSLC ?
• Engineering Tests
• Collision stability
• Luminosity as function of particle/spin
  combination
• Two photon hadronic backgrounds
• Physics Measurements