Title :
Longitudinal impedance simulations in ORBIT: benchmarking and application to the SNS extraction kicker
Author :
Woody, K. ; Holmes, J.A. ; Danilov, V. ; Galambos, J.D.
Author_Institution :
Tennessee Technol. Univ., Cookeville, TN, USA
Abstract :
Longitudinal and transverse impedances have been incorporated into the ORBIT particle beam dynamics code. This paper deals with longitudinal impedance calculations. The model has been validated for low harmonic number ring stability calculations. Successful benchmarking with the ESME code, for a case without space charge, and with analytical instability thresholds, for coasting beams with and without space charge, has been carried out. The model was then applied to the SNS ring using the measured impedance of the proposed extraction kicker, and it was found that the instability threshold occurred at about four times the proposed current for 2 MW operation
Keywords :
high energy physics instrumentation computing; neutron sources; particle beam dynamics; particle beam extraction; particle beam stability; proton accelerators; space charge; storage rings; 2 MW; ESME code; ORBIT; SNS extraction kicker; Spallation Neutron Source; analytical instability thresholds; benchmarking; harmonic number ring stability; longitudinal impedance simulations; particle beam dynamics code; space charge; transverse impedances; Benchmark testing; Current measurement; Extraterrestrial measurements; Impedance measurement; Orbital calculations; Particle beam measurements; Particle beams; Radio frequency; Space charge; Stability;
Conference_Titel :
Particle Accelerator Conference, 2001. PAC 2001. Proceedings of the 2001
Conference_Location :
Chicago, IL
Print_ISBN :
0-7803-7191-7
DOI :
10.1109/PAC.2001.987275
