Measurement and simulation of the RHIC abort kicker longitudinal impedence

Abreu,N.P. ; Hahn,H. ; Choi, E.

关键词: COMPUTERIZED SIMULATION;    COMPUTERS;    FREQUENCY RANGE;    IMPEDANCE;    MAGNETS;    RESONANCE;    SIMULATION controls;    relational databases;    relativistic heavy ion collider;   

DOI  :  10.2172/970519
RP-ID  :  BNL--90498-2009-IR
PID  :  OSTI ID: 970519
Others  :  R&D Project: KBCH139
Others  :  Other: KB0202011
Others  :  TRN: US201003%%236

学科分类：社会科学、人文和艺术（综合）

美国|英语

来源: SciTech Connect

【 摘 要 】

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.