Plans for Laser-wire System Grahame Blair 21 st June 2005 Brief overview of UK LW programme ATF Extraction line LW Plans for this year ATF2

Laser-wire People BESSY T. Kamps DESY H. C. Lewin, S. Schreiber, K. Wittenburg, K. Balewski Oxford R. Bingham, S. Dixit,B. Foster, N. Delerue, D. Howell, A. Reichold Royal Holloway (UL) A.Agapov, G. Blair, G. Boorman, A. Bosco, J. Carter, L. Deacon, F. Poirier, M. Price, C. Driouichi University College London (UL) S. Boogert, S. Malton CCLRC Daresbury L. Jenner KEK A.Aryshev, H. Hayano, P. Karataev, K. Kubo, N. Terunuma, J. Urakawa Kyoto N. Sasao SLAC A. Brachmann, J. Frisch, M. Ross Project web page:

Laserwire - PETRA + UCL RHUL UCL DESY CERN Oxford Progressing really well

PETRA laser-wire – 2d system 2-d scanning system Mechanics designed + built at Oxford Optics + electronics on order Final construction at RHUL with UCL + Oxford Will be shipped to DESY in summer 2005

Laser-wire Future Major new laser lab now set up at Oxford Building international group in advanced lasers for accelerators; mode-locked system planned. Install micron laser wire in ATF extraction line Build expertise in ultra-fast EO scanning Improve PETRA LW performance Plan move to PETRAIII location + new optics Build ATF2 micron-scale laser-wire Multiple IP systems ATF2 proposal for LW “Shintake” systems with Tokyo Uni./ KEK (ATF2 proposal in preparation)

At ATF, we will aim to measure micron-scale electron spot-sizes with green (532 nm) light. Aim at intra-rain (fast) scan for 300ns 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. ATF Laser-wire Motivation

pulsed laser-wire location

This year’s activity for the ATF extraction line laser-wire March 2005: “study trip”: Understand the possible setup [optics/infrastructure], prepare our DAQ. May 2005: Laser measurements, study the laser beam optics. Plan DAQ. Electron beam optics. Lens design. September 2005: Install laser transport and beam delivery (Optics, Scanning, electronics), install vacuum vessel and build final focusing lens. First installation of DAQ. November/December 2005: Laser-wire run.

This year’s activity for the PETRA laser-wire March-June 2005: Improve our DAQ, data taking and analysis. July 2005 (?): Purchase and install new Q-switched, injection seeded laser (EUROTeV). Complete measurements on 2-d system at RHUL. September 2005: Ship 2-d system to DESY, install and make first tests. Continue planning of PETRAIII system. October/December 2005: Laser-wire run with new system.

Other issues Multiple IPs: How many laser-wires will we need for ATF2 / ILC? Synergy with “Shintake” system. Laser transport: Multiple IPs – how do we distribute the laser light; fibers ? Local laser amplifiers ? Timing issues ? Compton Detectors: How best to detect – electrons/photons (both?). Speed, resolution, location. Also EUROTeV input here. Optics design of beam diagnostics region Still lots to do; intrinsic part of our programme.

Complementary Strategy PETRA aims: Turn-key diagnostic, reliability, speed, resolution. 2-d system. Workhorse diagnostic for PETRA III and foundation for ILC. Will use identical DAQ for ATF. ATF2 aims: Micron spot-sizes in ILC-like conditions. Critical LW specs for CDR. Both: excellent training ground for the people who will actually build the ILC

Mode Locked Laser UK laser lab: Dedicated laser lab now complete at Oxford. We will start to build a mode-locked system this autumn. Aim at 300ns bunch spacing High stability Compatibility with ultra-fast scanning

Summary PETRA and ATF/ATF2 complementary laser-wire systems Strong international team growing around ATF/ATF2 Major new laser project about to grow in UK. Collaboration continues with DESY on detector technology Continuing to explore ILC performance requirements Full simulations in progress towards Snowmass.