CERN Accelerating science

Article
Title	The SRI Beam Size Monitor Developed at NSRRC
Author(s)	Tseng, Tse-Chuan ; Chen June Rong ; Ho, H C ; Jen Wang, Duan ; Kuan, Chien-Kuang ; Lin, Chia-Jui ; Perng, Shen-Yaw ; Wang, Jeremy
Affiliation	(NSRRC, Hsinchu)
Publication	2005
In:	21st IEEE Particle Accelerator Conference, Knoxville, TN, USA, 16 - 20 May 2005, pp.3465
Subject category	Accelerators and Storage Rings
Abstract	A beam size monitor based on the synchrotron radiation interferometer (SRI) was installed in the NSRRC TLS. This monitor consists of a simple diagnostic beamline with a water-cooled beryllium mirror inside and a detecting optical system for both vertical and horizontal beam size measurement. The beam sizes measured are 48 micron and 160 micron respectively and are more close to the theoretical values than the synchrotron image monitor. Comparing with other monitors, at least 1 micron beam size variation is detectable. To minimize the thermal effect, the mirror is located far away from the source point and closed to the detecting optical system. The thermal distortion of the mirror is quite small measured by a portable long trace profiler (LTP) and agrees with the simulating analysis. The detailed monitor system design and testing results are presented in this paper.