Multi banch generation Experiment at ATF

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Multi banch generation Experiment at ATF Tohru Takahashi Hiroshima University KEK – Hiroshima and close conatact with Waseda University, Seikei University and LAL Orsay Previsous study Multi-bunch measurement Future prospect August 2011 PosiPol2011, IHEP Beijing

Introduction Toward the positron sources Polarized e+ by laser Compton Scheme Omori Ee~1GeV for 10MeV gammas easy to control polarization Toward the positron sources -> increase intensity of gamma rays

l Lcav dL∝l/enhancement ~0.1nm for enhancement ~1000 Miyoshi PosiPol2010 Lcav l dL∝l/enhancement ~0.1nm for enhancement ~1000

Two Prototype Cavities 2-mirror cavity (Hiroshima / Weseda / Kyoto / IHEP / KEK) 4-mirror cavity moderate enhancement moderate spot size simple control high enhancement small spot size complicated control demonstration of g ray gen. accum. exp. w/ cavity and acc. intense g ray generation

. Experimental R/D in ATF Make a fist prototype 2-mirror cavity Hiroshima-Waseda-Kyoto-IHEP-KEK Make a fist prototype 2-mirror cavity Lcav = 420 mm . Put it in ATF ring

Progress of the 2M cavity 2007/2008 -- installed into the ATF g ray signal comfirmed 2008/2009 --- synchronized w/ e- 500W, g ray generation 2008/2009 -- more encasement (750) 2.5kW, g ray generation 2010- bunch by bunch measurement Aug 2011 removed for the 4M installatoin reported in previous meeting

in 2010 operation laser power enhancement 750 stored 1.5kW g rays 10 bunches ~10 g/bunch in the detector number of counts energy in the detector [MeV]

Miyoshi PosiPol210

Miyoshi PosiPol210

Miyoshi PosiPol210

Miyoshi PosiPol210

Miyoshi PosiPol2010

Data Acquisition ADC to count total # of gs Scope for wave form

Observed signal with 10 bunch pulse height [mV] T [ns] Fitted w/ scintillation + detector response + ,,,,,,,,,,,

bunch by bunch g rays no bunch position dependence in a train normalized g rays [/kW/mA head bunch number tail no bunch position dependence in a train absolute # is consistent w/ estimation

summary ATF is back On See Omori san for detail rays from multibunch beam was observed Multi-bunch detection system will be updated for wider dynamic range faster and continuous data acquisition The two mirror cavity completed removed from the beam line 4 mirror cavity will be installed soon (beginning of october hopefully) all experiences will be inherited to future studies