Measurement and simulation of the RHIC abort kicker longitudinal impedence

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In face of the new upgrades for RHIC the longitudinal impedance of the machine plays an important role in setting the threshold for instabilities and the efficacy of some systems. In this paper we describe the measurement of the longitudinal impedance of the abort kicker for RHIC as well as computer simulations of the structure. The impedance measurement was done by the S{sub 21} wire method covering the frequency range from 9 kHz to 2.5 GHz. We observed a sharp resonance peak around 10 MHz and a broader peak around 20 MHz in both, the real and imaginary part, of ... continued below

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Abreu, N. P.; Hahn, H. & Choi, E. September 1, 2009.

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Description

In face of the new upgrades for RHIC the longitudinal impedance of the machine plays an important role in setting the threshold for instabilities and the efficacy of some systems. In this paper we describe the measurement of the longitudinal impedance of the abort kicker for RHIC as well as computer simulations of the structure. The impedance measurement was done by the S{sub 21} wire method covering the frequency range from 9 kHz to 2.5 GHz. We observed a sharp resonance peak around 10 MHz and a broader peak around 20 MHz in both, the real and imaginary part, of the Z/n. These two peaks account for a maximum imaginary longitudinal impedance of j15 {Omega}, a value an order of magnitude larger than the estimated value of j0.2 {Omega}, which indicates that the kicker is one of the main sources of longitudinal impedance in the machine. A computer model was constructed for simulations in the CST MWS program. Results for the magnet input and the also the beam impedance are compared to the measurements. A more detail study of the system properties and possible changes to reduce the coupling impedance are presented.

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  • Related Information: PAC09

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  • Report No.: BNL--90498-2009-IR
  • Grant Number: DE-AC02-98CH10886
  • DOI: 10.2172/970519 | External Link
  • Office of Scientific & Technical Information Report Number: 970519
  • Archival Resource Key: ark:/67531/metadc933067

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  • September 1, 2009

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  • Nov. 13, 2016, 7:26 p.m.

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  • Dec. 12, 2016, 8:38 p.m.

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Abreu, N. P.; Hahn, H. & Choi, E. Measurement and simulation of the RHIC abort kicker longitudinal impedence, report, September 1, 2009; United States. (digital.library.unt.edu/ark:/67531/metadc933067/: accessed August 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.