TY - JOUR
T1 - Upgraded laser wire beam profile monitor
AU - Honda, Yosuke
AU - Sasao, Noboru
AU - Araki, Sakae
AU - Higashi, Yasuo
AU - Okugi, Toshiyuki
AU - Taniguchi, Takashi
AU - Urakawa, Junji
AU - Yamazaki, Yoshio
AU - Hirano, Koichiro
AU - Nomura, Masahiro
AU - Takano, Mikio
AU - Sakai, Hiroshi
PY - 2005/2/11
Y1 - 2005/2/11
N2 - We describe in this report an upgraded version of the laser wire beam profile monitor developed at KEK to measure a low-emittance electron beam in the ATF damping ring. This monitor is based on the Compton scattering of electrons with a laser light target. A thin and intense laser beam is produced by exciting a Fabry-Perot optical cavity with a CW laser. Various improvements were made to the original setup. First, the effective laser power inside the cavity was increased by an order of magnitude, leading to a drastic increase in a signal-to-background ratio and a decrease in measurement time. Second, readout circuits were modified to separately measure beam sizes of each bunch in a multi-bunch beam. Third, two cavities were installed to measure both horizontal and vertical beam sizes. With this upgraded setup, measurements of electron beam emittance operated in a multi-bunch mode were carried out successfully.
AB - We describe in this report an upgraded version of the laser wire beam profile monitor developed at KEK to measure a low-emittance electron beam in the ATF damping ring. This monitor is based on the Compton scattering of electrons with a laser light target. A thin and intense laser beam is produced by exciting a Fabry-Perot optical cavity with a CW laser. Various improvements were made to the original setup. First, the effective laser power inside the cavity was increased by an order of magnitude, leading to a drastic increase in a signal-to-background ratio and a decrease in measurement time. Second, readout circuits were modified to separately measure beam sizes of each bunch in a multi-bunch beam. Third, two cavities were installed to measure both horizontal and vertical beam sizes. With this upgraded setup, measurements of electron beam emittance operated in a multi-bunch mode were carried out successfully.
KW - Beam emittance
KW - Compton scattering
KW - Fabry-Perot cavity
KW - Laser wire
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U2 - 10.1016/j.nima.2004.08.122
DO - 10.1016/j.nima.2004.08.122
M3 - Article
AN - SCOPUS:20144367572
VL - 538
SP - 100
EP - 115
JO - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
JF - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
SN - 0168-9002
IS - 1-3
ER -