Longitudinal impedance tuner using high permeability material

Author

Koba, K. ; Arakawa, D. ; Fujieda, M. ; Ikegami, K. ; Ishi, Y. ; Kanai, Y. ; Kubota, C. ; Machida, S. ; Mori, Y. ; Ohmori, C. ; Shinto, K. ; Shibuya, S. ; Takagi, A. ; Toyama, T. ; Uesugi, T. ; Watanabe, T. ; Yamamoto, M. ; Yokoi, T. ; Yoshii, M.

Author_Institution

KEK, Tsukuba, Japan

Volume

3

fYear

1999

fDate

1999

Firstpage

1653

Abstract

We have succeeded in canceling longitudinal space charge effects using the `impedance tuner´ at the KEK-PS. The impedance tuner consists of the new material, `FINEMET´ which has large permeability over the beam spectrum region. A frequency shift of coherent quadrupole mode is measured to infer the modified impedance. It turns out that nonlinearity unavoidable in a longitudinal RF bucket has to be treated carefully in order to digest observed beam signals. We describe how to measure the impedance from the beam signal, how to analyze the effect of impedance tuner, and how to succeed in canceling space charge effects

Keywords

beam handling equipment; particle beam stability; permeability; proton accelerators; space charge; synchrotrons; FINEMET; KEK-PS; beam spectrum region; coherent quadrupole mode; frequency shift; high permeability material; longitudinal RF bucket; longitudinal impedance tuner; longitudinal space charge effects; space charge effects; Charge measurement; Current measurement; Frequency measurement; Impedance measurement; Permeability; RF signals; Radio frequency; Signal analysis; Space charge; Tuners;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 1999. Proceedings of the 1999

Conference_Location

New York, NY

Print_ISBN

0-7803-5573-3

Type

conf

DOI

10.1109/PAC.1999.794211

Filename

794211