Algorithms and implementations of APT resonant control system

Conference · Fri Aug 01 04:00:00 EDT 1997

OSTI ID:519108

Wang, Yi-Ming; Regan, A

A digital signal processor is implemented to control resonant frequency of the RFQ prototype in APT/LEDA. Two schemes are implemented to calculate the resonant frequency of RFQ. One uses the measurement of the forward and reflected fields. The other uses the measurement of the forward and transmitted fields. The former is sensitive and accurate when the operation frequency is relatively far from the resonant frequency. The latter gives accurate results when the operation frequency is close to the resonant frequency. Linearized algorithms are derived to calculate the resonant frequency of the RFQ efficiently using a fixed-point DSP. The control frequency range is about 100kHz for 350MHz operation frequency. A frequency agile scheme is employed using a dual direct digital synthesizer to drive klystron at the cavity`s resonant frequency (not necessarily the required beam resonant frequency) in power-up mode to quickly the cavity to the desired resonant frequency. This paper will address the algorithm implementation, error analysis, as well as related hardware design issues.

• Research Organization: Los Alamos National Lab., NM (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 519108
• Report Number(s): LA-UR--97-1772; CONF-970503--238; ON: DE97008205
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
43 PARTICLE ACCELERATORS
ALGORITHMS
CONTROL SYSTEMS
FREQUENCY CONTROL
ISOTOPE PRODUCTION
KLYSTRONS
LINEAR ACCELERATORS
QUADRUPOLE LINACS
RF SYSTEMS
SPALLATION
TRITIUM