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NSLS-II longitudinal impedance budget

Journal Article · · Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment
 [1];  [1];  [1];  [1];  [1]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States)
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From the beginning of the NSLS-II project, the vacuum chamber of the NSLS-II storage ring has been optimized to reduce its impedance. The optimization, performed in close collaboration with the Diagnostic, Vacuum, RF, and Mechanical Engineering groups, has been achieved via calculating the impedance of the vacuum chamber components with the use of both analytical and numerical tools, with the numerical computations carried out with the GdfidL code. Fore reliable NSLS-II operation with the total beam current of 500 mA, each component of the vacuum chamber has been individually optimized to minimize the beam-induced heating and to prevent single-bunch and coupled-bunch instabilities. In this study, the impedance calculation and optimization know-how are summarized for all the chamber components, and the total longitudinal impedance budget is analyzed. As a result of this extensive research and engineering effort, the design beam current of 500 mA has been recently accumulated in NSLS-II without any major problem caused by collective effects.
Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0012704
OSTI ID:
1787819
Alternate ID(s):
OSTI ID: 1828459
Report Number(s):
BNL--221353-2021-JAAM
Journal Information:
Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment, Journal Name: Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment Vol. 1005; ISSN 0168-9002
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

References (13)

Beam impedance and heating analysis of the diagnostic stripline
  • Blednykh, A.; Bacha, B.; Bassi, G.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 963 https://doi.org/10.1016/j.nima.2020.163729
journal May 2020
New aspects of longitudinal instabilities in electron storage rings journal August 2018
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Loss factor for short bunches in azimuthally symmetric tapered structures journal June 2010
Impedance scaling for small angle transitions journal January 2011
Longitudinal wakefield for an axisymmetric collimator journal May 2012
Coupling impedance of an in-vacuum undulator: Measurement, simulation, and analytical estimation journal July 2014
TE/TM field solver for particle beam simulations without numerical Cherenkov radiation journal April 2005
Indirect methods for wake potential integration journal October 2006
Coupling impedance in modern accelerators journal July 1991
Coupling impedance of CESR-B RF cavity for the NSLS-II storage ring conference June 2007
Conceptual design of the NSLS-II RF system conference June 2007
Characteristics of Directional Coupler Beam Position Monitors journal January 1985

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