ATF2: Laser-wire Scheduling Strategy Grahame Blair Current Status Funding application Possible...
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Transcript of ATF2: Laser-wire Scheduling Strategy Grahame Blair Current Status Funding application Possible...
![Page 1: ATF2: Laser-wire Scheduling Strategy Grahame Blair Current Status Funding application Possible Scheduling Strategy Second ATF2 Project Meeting, KEK, 31.](https://reader034.fdocuments.in/reader034/viewer/2022052516/5a4d1b927f8b9ab0599c1bbc/html5/thumbnails/1.jpg)
ATF2: Laser-wire Scheduling Strategy
Grahame Blair
• Current Status• Funding application • Possible Scheduling Strategy
Second ATF2 Project Meeting,KEK,
31st May 2006
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OxfordB. Foster, N. Delerue, S. Dixit, F. Gannaway, D. Howell,
M. Qureshi, A. Reichold, R. SenanayakeRoyal Holloway (UL)
A.Agapov, G. Blair, S. Boogert, G. Boorman, A. Bosco, J. Carter, L. Deacon, P. Karataev, M. Price
CCLRC DaresburyL. Jenner
KEKA. Aryshev, H. Hayano, K. Kubo, N. Terunuma,
J. UrakawaSLAC
A. Brachmann, J. Frisch, M. Ross
ATF Laser-wire
Project web page: http://www.hep.ph.rhul.ac.uk/~lbbd/
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ATF Laser-wireATF Laser-wire• At ATF, we will aim to measure micron-scale electron spot-sizes with green (532 nm) light.
• Aim at intra-train (fast) scan for 150 ns bunch spacing.
• The final spot-size measurable at ILC will have implications for the length and layout of the BDS diagnostics section. • The ATF/ATF2 results will be crucial to determine the technical boundaries.
pulsed laser-wire location
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ATF Laser-wireVacuum chamber built in Oxford and Installed in ATF extractionLine in December 2006.
Laser lighttransported toIP.
Commerciallens for early tests
Upgrade to f2optics in Autumn 06.
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Collisions SeenCollisions Seen• Left: scope traces of
Cherenkhov detector signal
• Top: laser shutter closed
• Bottom: laser shutter open
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Z= 9.5 Z= 10.0 Z= 10.3
Z= 10.5 Z= 10.7 Z= 11.0
Z= 11.5 Z= 11.5 Z= 12.5
Vertical scans at different laser-z positions
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Scan of laser waist with electron beam
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ATF LW Plans• Data runs ongoing • More runs 06/07; lots of systematics to understand (eg
beam jitter, BPM integration …)• Integrate solid wire scanner into vac. vessel design• Iteration on lens design.• Provide statement to GDE on technical feasibility of
reliable micron-scale LWLonger term:
• Play a major role in ATF2 LW system.• Multiple IP’s, laser system, light transport.• Investigate LW emittance measurement scheme for ILC.• Investigate frequency tripled light?
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ATF2 LW PlansA Staged approach is most likely
New funding proposal is currently in preparation
for the period 2007-2010
Outcome should be known around end of 2006
Depending on outcome of this proposal:
•Start with installation of laser hut
•First stage of light transport system
•Single 2-D LW-IP system
•Test performance of this LW IP.
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Laser hut
2-d LW IPDetector Collimation
Possible Stage 1
Test design of 2-D IP: if OK, can build additional ones
Light path = evacuated 4” pipe, containing relay optics
Full Light pipe may need to be installed at stage 1
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Laser hut
2-d LW IPDetector Collimation
Possible Stage 2
Understand how to operate two IPs and analyse results
If all is well, can extend to rest of system:
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Laser hut
2-d LW IPDetector Collimation
Possible Stage 3
Final number of IPs will depend on level of funding
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Summary
•ATF LW is very active and producing results
•We expect this to continue into 2007
•Subject to new funding, an exciting
ATF2 programme is planned
•Multi-station LW IP system
•A staged approach is advisable, building
over the first few years of ATF2 operation.