RF sparking experiments at 108.5 and 216 MHz

Author

Gerhard, A. ; Kurz, M. ; Brutscher, J. ; Klein, H. ; Schempp, A.

Author_Institution

Inst. fuer Angewandte Phys., Johann Wolfgange Goethe Univ., Frankfurt, West Germany

Volume

24

Issue

6

fYear

1989

fDate

12/1/1989 12:00:00 AM

Firstpage

1033

Lastpage

1036

Abstract

The gap voltage in RFQ accelerating structures determines the attainable beam current. For many accelerator projects requiring a high beam current it is therefore necessary to apply a gap voltage near the breakdown voltage. The RF breakdown limit depends on many different parameters (electrode geometry, gap width, material, frequency, pulse length) and is not predictable. Experiments carried out to study breakdown phenomena with respect to the development of RFQ structures are reported. W.D. Kilpatrick´s prediction for the frequency dependence of the breakdown threshold (Rev. Sci. Instrum., vol.28, p.824-6, 1957) has not been confirmed in initial measurements

Keywords

cavity resonators; electrostatic accelerators; insulation; 108.5 MHz; 216 MHz; RF breakdown limit; RF sparking experiments; RFQ accelerating structures; accelerator projects; beam current; breakdown threshold; breakdown voltage; electrode geometry; frequency; frequency dependence; gap voltage; gap width; high beam current; material; pulse length; vacuum insulation; Acceleration; Coaxial components; Copper; Electrodes; Energy measurement; Equations; Radio frequency; Testing; Voltage measurement; X-ray detectors;

fLanguage

English

Journal_Title

Electrical Insulation, IEEE Transactions on

Publisher

ieee

ISSN

0018-9367

Type

jour

DOI

10.1109/14.46333

Filename

46333