Machine-Detector%20Interface

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Machine-Detector Interface

• Tom Markiewicz
• LC RD Opportunities, SLAC
• May 21, 2002

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Machine Detector Interface
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-20m lt Issues lt 200m

• Backgrounds
• Simulations
• Final Doublet Magnet Technology
• Vibration Stabilization
• IR Layout
• Instrumentation (L,E, P other)
• Vibration Sources measurement modeling
• gg IR Issues

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Backgrounds

• IP Backgrounds
• Beam-Beam Interaction
• Disrupted primary beam
• Extraction Line Losses
• Beamstrahlung photons
• e,e- pairs from beams. gg interactions
• Hadrons from beams. gg interactions
• Radiative Bhabhas

Experts Takashi Maruyama/SLAC Lew
Keller/SLAC Jeff Gronberg/LLNL Stan
Hertzbach/U.Mass
Programs Guinea Pig / CAIN GEANT 3 / GEANT 4 EGS
/ FLUKA TRANSPORT / DIMAD / TURTLE MUCARLO QSRAD

• Machine Backgrounds
• Synchrotron Radiation
• Muons Production at collimators
• Direct Beam Loss
• Beam-Gas
• Collimator edge scattering
• Neutron back-shine from Dump

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Background Simulation Results
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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

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Simulations
Experts Peter Tenenbaum/SLAC Andrei Seryi/SLAC
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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

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Final Doublet Magnet Technology
Experts Andy Ringwall/SLAC-PEP3 Brett Parker/BNL
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
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Magnet RD Topics

• 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

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Inertial Vibration Stabilization Projects

• Sensor design
• Algorithms
• Simple 3m pseudo-magnet test
• Relative motion of two blocks

Experts Joe Frisch/SLAC Linda Hendrikson/SLAC Tom
Himel/SLAC Eric Doyle/SLAC Leif Ericksson/SLAC
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Interferometric Vibration Stabilization
Experts Tom Mattison/UBC Mike Woods/SLAC
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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
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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
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IR Design
Experts Tom Markiewicz/SLAC Knut Skarpaas/SLAC
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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

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Instrumentation

• Lum, Energy Pol Instrumentation (to be)
  addressed by MikeWoods Eric Torrence
• Other
• Halo Monitor Need a good idea
• SLD/SLC Ran a wire or collimator edge into the
  beam and looked at CDC Calorimeter response

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Vibration Sources Measurement Modeling

• Importance of this topic to stable luminosity
  makes it important part of the EXPERIMENTAL
  program and DETECTOR design
• Participate in current measurements
• Sites
• Equipment Noise
• Design of IR that mitigates and minimizes
  man-made sources
• ANSYS sims of detector
• Industrial vib. suppression tools applied to HEP

Experts Andrei Seryi/SLAC Fred Asiri/SLAC
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gg IR Issues
Experts Jeff Gronberg/LLNL David Asner/LLNL Ken
Skulina/LLNL Jim Early/LLNL
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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