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IR Working Group Summary. Tom Markiewicz LC R&D Workshop, UCSC June 29, 2002. 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.

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ir working group summary

IR Working Group Summary

Tom Markiewicz

LC R&D Workshop, UCSC

June 29, 2002

ir group people
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
20m issues 200m
-20m < Issues < 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
one parallel session
One Parallel Session
  • Background Update
    • Takashi Maruyama / SLAC
  • IR Layout & R&D Status
    • TWM / SLAC
  • SLC gg Testbed
    • Jeff Gronberg / LLNL
  • Polarization Measurements at SLC gg Testbed
    • Sahal Yacoob / NorthWestern University
user files available
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?
beamline collimators synchrotron radiation

SR Photons at IP

R=1cm

Beamline: Collimators & Synchrotron Radiation

107 Halo left after E_Slit

IP

Oct Off

Oct On

100

10

850mm

400mm

E_Slit

Collimation Depth:Was: 8sx x 40syNow: 19sx x 52sy

Spoilers & Absorbers

inertial vibration stabilization projects
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
ip girder test concept

STS2

STS2

STS2

STS2

STS2

Witness IF

O.A. IF

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

lcd l2 3t with 3 8m l optics snowmass 2001
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

current ir thinking
Current IR Thinking

117 mrad Cal acceptance

36 mrad M1 acceptance

M2

M1

25 cm radius support tube

photon collider testbed hardware optical assembly
Photon Collider Testbed HardwareOptical Assembly

½ scale version of the NLC design

Position of final quads in SLC sets the scale

  • 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?

Final focus optics are fixed

Steering mirrors are on piezo movers

engineering test facility at slc
Engineering Test Facility at SLC

30 GeV

1100 / 50

1600 / 160

8 / 0.1 mm

0.1 – 1.0 mm

1500/55nm

6.0E9

Beam Energy

DR gx,y (m-rad)

FF gx,y (m-rad)

x / y

 z

x,y

N

slide15
Photon Collider Testbed Hardware½ Scale prototype of optics / alignment system is currently under construction

Beampipe

Alignment System

concluding statement
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 R&D world for interested groups or individuals
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