Measurement and simulation of the RHIC abort kicker longitudinal impedence
Abstract
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.
- Authors:
- Publication Date:
- Research Org.:
- Brookhaven National Lab. (BNL), Upton, NY (United States). Relativistic Heavy Ion Collider (RHIC)
- Sponsoring Org.:
- Doe - Office Of Science
- OSTI Identifier:
- 970519
- Report Number(s):
- BNL-90498-2009-IR
R&D Project: KBCH139; KB0202011; TRN: US201003%%236
- DOE Contract Number:
- DE-AC02-98CH10886
- Resource Type:
- Technical Report
- Resource Relation:
- Related Information: PAC09
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE; COMPUTERIZED SIMULATION; COMPUTERS; FREQUENCY RANGE; IMPEDANCE; MAGNETS; RESONANCE; SIMULATION; controls, relational databases; relativistic heavy ion collider
Citation Formats
Abreu, N P, Hahn, H, and Choi, E. Measurement and simulation of the RHIC abort kicker longitudinal impedence. United States: N. p., 2009.
Web. doi:10.2172/970519.
Abreu, N P, Hahn, H, & Choi, E. Measurement and simulation of the RHIC abort kicker longitudinal impedence. United States. https://doi.org/10.2172/970519
Abreu, N P, Hahn, H, and Choi, E. 2009.
"Measurement and simulation of the RHIC abort kicker longitudinal impedence". United States. https://doi.org/10.2172/970519. https://www.osti.gov/servlets/purl/970519.
@article{osti_970519,
title = {Measurement and simulation of the RHIC abort kicker longitudinal impedence},
author = {Abreu, N P and Hahn, H and Choi, E},
abstractNote = {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.},
doi = {10.2172/970519},
url = {https://www.osti.gov/biblio/970519},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Sep 01 00:00:00 EDT 2009},
month = {Tue Sep 01 00:00:00 EDT 2009}
}