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Mechanical requirement and influence on the design and manufacturing of beam position monitor of Taiwan photon source

Published online by Cambridge University Press:  01 April 2011

H. P. Hsueh
Affiliation:
National Synchrotron Radiation Research Center, National Tsing Hua University, 101 Hsin-Ann Road, Hsinchu, Taiwan, ROC30076
I. T. Huang
Affiliation:
National Synchrotron Radiation Research Center, National Tsing Hua University, 101 Hsin-Ann Road, Hsinchu, Taiwan, ROC30076
C. C. Chang
Affiliation:
National Synchrotron Radiation Research Center, National Tsing Hua University, 101 Hsin-Ann Road, Hsinchu, Taiwan, ROC30076
S. N. Hsu
Affiliation:
National Synchrotron Radiation Research Center, National Tsing Hua University, 101 Hsin-Ann Road, Hsinchu, Taiwan, ROC30076
G. Y. Hsiung
Affiliation:
National Synchrotron Radiation Research Center, National Tsing Hua University, 101 Hsin-Ann Road, Hsinchu, Taiwan, ROC30076
J. R. Chen
Affiliation:
National Synchrotron Radiation Research Center, National Tsing Hua University, 101 Hsin-Ann Road, Hsinchu, Taiwan, ROC30076 Biomedical Engineering and Environmental Sciences, National Tsing Hua University, 101 Sec. 2 Kuang-Fu Road, Hsinchu, Taiwan, 30013, R.O.C.
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Abstract

The beam position monitors (BPMs) with submicron-level resolution act as the major eyes of storage ring in detecting the position of electron beams and are used for feedback system to guide the beam orbit to the desired track. Compared to major improvements on backend electronics, the physical devices generate and transmit signals had little improvement due to the lack of control on manufacturing processes including all mechanical tolerance requirements. The design started with ANSYS to simulate mechanical deformation. Due to the small size (submillimetre) and complicated assembly of feedthrough structure, it is difficult to achieve 1 % tolerance (submicron) in all aspects including machining and brazing. The smallest tolerance for machining is 5 µ and the overall tolerance will be 30 µm. The influence of the tolerance on mechanical will be shown on time-domain reflectometry measurement. The resulted heat-related issue will also be discussed and addressed since the problem happened at SLAC (private communication with Albert Sheng at Stanford Linear Accelerator Center) and DIAMOND (presented at the RF Button Heating Mini-Workshop at EPAC 2008). Manufacturing steps will be described. The consequence of mismatch on manufacturing will be discussed. All related measurement and simulation data are presented in this paper.

Type
Poster paper
Copyright
Copyright © Diamond Light Source Ltd 2011

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References

Private Communication with Albert Sheng at SLAC.Google Scholar
Presented at the RF Button Heating Mini-Workshop at EPAC 2008.Google Scholar
Singh, O. 2008 NSLS-II Accelerator System Advisory Committee Review, Diagnostic Design and R&D.Google Scholar

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