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Title: Coherent Soft X-Ray Epu Vacuum Chamber Thermal Analysis for Synchrotron Radiation Protection

Authors:
; ; ; ; ; ; ;
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
OSTI Identifier:
1413912
Report Number(s):
BNL-114335-2017-CP
DOE Contract Number:
SC0012704
Resource Type:
Conference
Resource Relation:
Conference: Mechanical Engineering Design of Synchrotron Radiation Equipment and Instrumentation (MEDSI 2016); Barcelona, Spain; 20160911 through 20160916
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; NSLS-II; vacuum chamber; elliptically; polarizing; undulator; National Synchrotron Light Source II

Citation Formats

Fernandes H., Kitegi C., Harder, D., Hidas, D., Rank, J., Musardo, M., Cappadoro, P., and Tanabe, T.. Coherent Soft X-Ray Epu Vacuum Chamber Thermal Analysis for Synchrotron Radiation Protection. United States: N. p., 2016. Web.
Fernandes H., Kitegi C., Harder, D., Hidas, D., Rank, J., Musardo, M., Cappadoro, P., & Tanabe, T.. Coherent Soft X-Ray Epu Vacuum Chamber Thermal Analysis for Synchrotron Radiation Protection. United States.
Fernandes H., Kitegi C., Harder, D., Hidas, D., Rank, J., Musardo, M., Cappadoro, P., and Tanabe, T.. 2016. "Coherent Soft X-Ray Epu Vacuum Chamber Thermal Analysis for Synchrotron Radiation Protection". United States. doi:. https://www.osti.gov/servlets/purl/1413912.
@article{osti_1413912,
title = {Coherent Soft X-Ray Epu Vacuum Chamber Thermal Analysis for Synchrotron Radiation Protection},
author = {Fernandes H. and Kitegi C. and Harder, D. and Hidas, D. and Rank, J. and Musardo, M. and Cappadoro, P. and Tanabe, T.},
abstractNote = {},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2016,
month = 9
}

Conference:
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  • Coherent synchrotron radiation (CSR) in a singly-connected vacuum chamber is, as it is well known, strongly suppressed for harmonics n{sub cr} less-than-or-equal to (R/h){sup 3/2}, where R is the radius of curvature and h is characteristic transverse dimension. If, however, the vacuum chamber has a multiply-connected topology, the critical frequency is zero and this restriction is not valid anymore. Estimation for radiated power in a multiply-connected chamber is presented here including CSR in electrostatic separator and at the LHC collider.
  • The addition of undulators and wigglers into synchrotron storage rings created new problems in terms of protecting the integrity of the ring vacuum chamber. If the photon beam from these devices were missteered into striking an inadequately cooled section of the storage ring vacuum chamber, the structural strength might be reduced sufficiently that the vacuum envelope could be penetrated, resulting in long downtime of the storage ring. The new generation of high-energy synchrotron light sources will produce photon beams of such high power density that cooling of the vacuum chamber will not prevent a potential penetration of the vacuum envelope,more » and other methods of preventing this occurrence will be required. Since active methods will be used to ensure that the beams are delivered to beam lines for users during normal operation, there is a need for passive protection methods during non-routine operation, such as turning on new beam lines, injection, etc., when the active systems may be disabled. In addition, the passive methods could prevent the problem from arising and provide the rapid time response necessary for the highest power beams, a property that might not be easily and reliably provided by active methods during the early operation of these machines. This paper summarizes the results of a task group that studied the problem and outlines passive methods of protection for the Advanced Photon Source (APS). 2 refs., 3 figs., 1 tab.« less
  • In this paper we address the question of storage ring vacuum chamber placement and its effect on the synchrotron radiation fan obtainable. We consider only horizontal errors and thus treat the problem two-dimensionally. Specifically, we describe the correlation between the parameters of the chamber and its position in the magnet and the size of the fan of radiation emerging from a port.
  • In this paper we address the question of storage ring vacuum chamber placement and its effect on the synchrotron radiation fan obtainable. We consider only horizonal errors and thus treat the problem two-dimensionally. Specifically, we describe the correlation between the parameters of the chamber and its position in the magnet and the size of the fan of radiation emerging from a port.
  • There are several papers concerning shielding of coherent synchrotron radiation (CSR) emitted by a Gaussian line charge on a circular orbit centered between two parallel conducting plates. Previous asymptotic analyses in the frequency domain show that shielded steady-state CSR mainly arises from harmonics in the bunch frequency exceeding the threshold harmonic for satisfying the boundary conditions at the plates. In this paper the authors extend the frequency-domain analysis into the regime of strong shielding, in which the threshold harmonic exceeds the characteristic frequency of the bunch. The result is then compared to the shielded steady-state CSR power obtained using imagemore » charges.« less