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Description
We are developing relatively large 2D 4-mirror optical cavity to reduce the crossing angle between electron bunch train and laser pulse train. Total length of first 2D 4-mirror optical cavity is 7.56m and it includes 9 laser pulse train to realize the crossing angle of 8 degrees between electron beam in Linear accelerator and the laser pulse train in the optical cavity [1]. Second 2D 4-mirror optical cavity is under design and the total length of planed cavity is 16.6m in which 18 laser pulse train can circulate and we have the possibility to realize the crossing angle of 2 degrees.
I will report the performance of first 2D 4-mirror optical cavity and the experimental plan on 2D 4-mirror optical cavities. Below photo shows 1.9m long 2D 4-mirror optical cavity which is operating to generate X-ray. We hope it will be installed into Super-conducting Linear accelerator (STF) to generate high brightness gamma-ray in the future.
Kazuyuki Sakaue, Masakazu Washio, Sakae Araki, Masafumi Fukuda, Yosuke Honda, Nobuhiro Terunuma, and Junji Urakawa, “Stabilization of an optical enhancement cavity using a counter propagating mode” REVIEW OF SCIENTIFIC INSTRUMENTS 89, 023305 (2018).
