Commissioning experience with the PEP-II low-level RF system

Author

Corredoura, P. ; Allison, S. ; Claus, R. ; Ross, W. ; Sapozhnikov, L. ; Schwarz, H.D. ; Tighe, R. ; Yee, C. ; Ziomek, C.

Author_Institution

Stanford Linear Accel. Center, Stanford Univ., CA, USA

Volume

2

fYear

1997

fDate

12-16 May 1997

Firstpage

2359

Abstract

The low-level RF system for PEP-II is a modular design housed in a VXI environment and supported by EPICS. All signal processing and control is done at baseband using in-phase and quadrature (IQ) techniques. Remotely configurable RF feedback loops are used to control coupled-bunch instabilities driven by the accelerating mode of the RF cavities. A programmable DSP based feedback loop is implemented to control DC phase variations across the klystron and to adaptively cancel modulations caused by klystron power supply ripple at selected power line harmonics between 60 Hz and 10 kHz. The system contains a built-in baseband network analyzer which allows remote measurement of the RF feedback loop transfer functions and automated configuration of these loops. This paper presents observations and measured data from the system

Keywords

accelerator RF systems; commissioning; electron accelerators; feedback; klystrons; network analysers; signal processing; storage rings; DC phase; EPICS; PEP-II; RF feedback loop transfer functions; RF feedback loops; VXI; baseband network analyzer; coupled-bunch instabilities; in-phase; klystron power supply ripple; low-level RF system; power line harmonics; quadrature; signal processing; Acceleration; Automatic control; Baseband; Digital signal processing; Feedback loop; Klystrons; Phase modulation; Process control; Radio frequency; Signal processing;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 1997. Proceedings of the 1997

Conference_Location

Vancouver, BC

Print_ISBN

0-7803-4376-X

Type

conf

DOI

10.1109/PAC.1997.751208

Filename

751208