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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. - PowerPoint PPT Presentation
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NLC - The Next Linear Collider Project
IR Working Group Summary
Tom MarkiewiczLC R&D Workshop, UCSC
June 29, 2002
Tom Markiewicz
NLC - The Next Linear Collider Project
IR Group People
NLC Accelerator Physics GroupNLC Beam Delivery & IR Group
LLNL GroupUniversity Groups
– Oxford University– U. of British Columbia
– Northwestern University– U. of Massachusetts
Tom Markiewicz
NLC - The Next Linear Collider Project
-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
IR Issues
Tom Markiewicz
NLC - The Next Linear Collider Project
One Parallel Session
• Background Update– Takashi Maruyama / SLAC
• IR Layout & R&D Status– TWM / SLAC
• SLC Testbed– Jeff Gronberg / LLNL
• Polarization Measurements at SLC Testbed– Sahal Yacoob / NorthWestern University
Tom Markiewicz
NLC - The Next Linear Collider Project
Background Simulation Results
Tom Markiewicz
NLC - The Next Linear Collider Project
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?
Tom Markiewicz
NLC - The Next Linear Collider Project
Beamline: Collimators & Synchrotron Radiation
IP
Spoilers & Absorbers
R=1cm
SR Photons at IP
Collimation Depth:Was: 8x x 40y
Now: 19x x 52y
400m 850m
107 Halo left after E_Slit
E_Slit
10
100
Oct Off
Oct On
Tom Markiewicz
NLC - The Next Linear Collider Project
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
Tom Markiewicz
NLC - The Next Linear Collider Project
IP Girder Test Concept
STS2 STS2 STS2STS2 STS2
Witness IF
O.A. IF
7m
7m
.5m
4.5m
–Support tube (Carbon fiber?)–Permanent magnet or model–Interaction with external solenoid field–Hard or soft actuators–Beam pipe & vacuum
Tom Markiewicz
NLC - The Next Linear Collider Project
-0.2
-0.15
-0.1
-0.05
0
0.05
0.1
0.15
0.2
0 2 4 6 8 10 12
LCD-L2 (3T) with 3.8m L* OpticsSnowmass 2001
QD0SD0
M1
Calorimeter
Pair LumMon
M2
Beampipe
Low Z shield
32 mrad M1 acceptance
Support Tube
6.3 mrad Lum-Mon acceptance
1 mrad exit aperture
QF1 SF1
52 mrad Cal acceptance
Feedback BPM & Kicker
Tom Markiewicz
NLC - The Next Linear Collider Project
-0.5
-0.4
-0.3
-0.2
-0.1
0
0.1
0.2
0.3
0.4
0.5
0 2 4 6 8 10 12 14
Current IR Thinking
M1
M236 mrad M1 acceptance
117 mrad Cal acceptance
25 cm radius support tube
Tom Markiewicz
NLC - The Next Linear Collider Project
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
Tom Markiewicz
NLC - The Next Linear Collider Project
Photon Collider Testbed HardwareOptical Assembly
• 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?
½ scale version of the NLC designPosition of final quads in SLC sets the scale
Final focus optics are fixedSteering mirrors are on piezo movers
Tom Markiewicz
NLC - The Next Linear Collider Project
Engineering Test Facility at SLC
Beam EnergyDRx,y (m-rad)
FFx,y (m-rad)
x / y
z
x,y
N
30 GeV
1100 / 50
8 / 0.1 mm
0.1 – 1.0 mm
1500/55nm
6.0E9
Tom Markiewicz
NLC - The Next Linear Collider Project
Photon Collider Testbed Hardware ½ Scale prototype of optics / alignment system is
currently under construction
Beampipe
Alignment System
Tom Markiewicz
NLC - The Next Linear Collider Project
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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