ATF2: Laser-wire Scheduling Strategy Grahame Blair Current Status Funding application Possible Scheduling Strategy Second ATF2 Project Meeting, KEK, 31.

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ATF2: Laser-wire Scheduling Strategy Grahame Blair Current Status Funding application Possible Scheduling Strategy Second ATF2 Project Meeting, KEK, 31 st May 2006

Oxford B. Foster, N. Delerue, S. Dixit, F. Gannaway, D. Howell, M. Qureshi, A. Reichold, R. Senanayake Royal Holloway (UL) A.Agapov, G. Blair, S. Boogert, G. Boorman, A. Bosco, J. Carter, L. Deacon, P. Karataev, M. Price CCLRC Daresbury L. Jenner KEK A. Aryshev, H. Hayano, K. Kubo, N. Terunuma, J. Urakawa SLAC A. Brachmann, J. Frisch, M. Ross ATF Laser-wire Project web page:

ATF 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

ATF Laser-wire Vacuum chamber built in Oxford and Installed in ATF extraction Line in December Laser light transported to IP. Commercial lens for early tests Upgrade to f2 optics in Autumn 06.

Collisions Seen Left: scope traces of Cherenkhov detector signal Top: laser shutter closed Bottom: laser shutter open

Z= 9.5 Z= 10.0Z= 10.3 Z= 10.5Z= 10.7 Z= 11.0 Z= 11.5 Z= 12.5 Vertical scans at different laser-z positions

Scan of laser waist with electron beam

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 LW Longer 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?

ATF2 LW Plans A Staged approach is most likely New funding proposal is currently in preparation for the period 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.

Laser hut 2-d LW IP DetectorCollimation 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

Laser hut 2-d LW IP DetectorCollimation Possible Stage 2 Understand how to operate two IPs and analyse results If all is well, can extend to rest of system:

Laser hut 2-d LW IP DetectorCollimation Possible Stage 3 Final number of IPs will depend on level of funding

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.