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
N1 - Funding Information:
We would like to express our gratitude to all members of the KEK-ATF group for their helpful support. We are also grateful to Dr. M. Ross and Dr. G. Blair for their useful discussions with our laser wire experiment. It is our pleasure to thank Professors Y. Totsuka, Y. Kamiya, S. Iwata and A. Enomoto for their continuous encouragement. This research was partially supported by Grant-in-Aid Scientific Research (13440078) from the Ministry of Education, Culture, Sports, Science and Technology of Japan, and also the budget for Advanced Compact Accelerator Project of National Institute of Radiological Sciences.
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 -