R&D description Schedule

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R&D description Schedule 4 mirrors high finesse optical cavity to produce high gamma ray flux at ATF Japanese Labs. : KEK, ATF group, Hiroshima University French Labs. : LAL (Orsay) in Collaboration with CELIA (Laser lab., Bordeaux) and LMA (mirror coatings Lab., Lyon) R&D description Schedule

New R&D : start february 2008 after 6th PCRD contract 2005-2008 1. Setup the following system at Bordeaux/Orsay CELIA >100W-200W LAL/KEK/LMA Oscillator =1W, 1030nm Dt~5ps frep=178.5MHz From Onefive compagny Amplifier Rod type photonic fiber Yb Doped Fabry-Perot cavity Gain~10000 LAL Numerical feedback Goal : Laser average power >1MW inside the cavity… 2. Installation of the system at ATF/KEK

R&D at KEK : Cavity installation on the Accelerator Test Facility (ATF) . ～ 54 m Beam Energy → 1.28GeV Beam Size 　→ 100μm×10μm Emittance　→ 1.0x10-9 rad.m 1.0x10-11 rad.m (Ultra Low !!) cavity ～ 30 m (H. Shimizu)

The laser amplification R&D E. Cormier (CELIA) Max published OneFive laser Dt=2-5ps, 178.5 MHz, 1W F. Röser et al. Optics letters, 30, p2754, 2005 Laser Diode No compressor needed Possible average power 100W-300W (simulation) Doped rod type photonic fibre: Large core diameter & monomode developed for CELIA Gold grating-based strectcher gives negative chirp for spectral compression

Choice of the cavity geometry Interaction plane must be horizontal 2D 2 choices 3D Main constraint: 5mm vertical slit width Optical path length = c/178.5MHz~1.6m 4 mirrors needed to reduce the laser spot size Power/polarisation stabilisation with 3D configuration

Implementation studies at ATF has started Cavity drawing has started

Rough schedule Year 2008 : Mechanical Design and installation plan studies in closed Collaboration with KEK-group Meetings LAL group visited KEK in Nov. 2007 KEK visited LAL in Feb. 2008 Next LAL visit at KEK: June 2008 to finalise mechanical drawings & participation to POSIPOL workshop at Hiroshima Webex meetings Laser Amplification studies at CELIA Feedback studies & mechanical drawing/construction at LAL Year 2009 (mid 2009 hopfully, end 2009 probably) Transport of the system to KEK and installation on ATF