Title :
Calculation of required tuner accuracy and bandwidth with and without fast feedback
Author :
Koscielniak, S.R.
Author_Institution :
TRIUMF, Vancouver, BC, Canada
Abstract :
An expression for the resonance-controller time constant is given in terms of the allowed tuner error and rate of frequency sweep. A cavity tuner-control with this time-constant guarantees the resonance program is tracked to the desired accuracy. Expressions are given for the permissible tuner frequency error, in terms of the reactive to resistive power ratio, for an accelerating cavity operating with or without fast feedback. An expression is given for the resonance frequency sweep rate for arbitrary drive frequency program and relative beam-loading. The results are applied to the TRIUMF-KAON accumulator and booster rings. The constraint imposed on the time constant by accumulation in the former is not severe; a passband of a few hundred hertz is sufficient. However, it is found that in the absence of fast feedback the booster tuner control must have a passband that extends to 300 kHz.<>
Keywords :
controllers; electron accelerators; feedback; nuclear electronics; storage rings; tuning; TRIUMF-KAON accumulator; accelerating cavity; allowed tuner error; arbitrary drive frequency; bandwidth; booster rings; cavity tuner-control; fast feedback; frequency sweep; passband; reactive to resistive power ratio; resonance program; resonance-controller time constant; tuner accuracy; Acceleration; Bandwidth; Error correction; Feedback; Frequency; Passband; Resonance; Tuners; Tuning; Voltage;
Conference_Titel :
Particle Accelerator Conference, 1991. Accelerator Science and Technology., Conference Record of the 1991 IEEE
Conference_Location :
San Francisco, CA, USA
Print_ISBN :
0-7803-0135-8
DOI :
10.1109/PAC.1991.164410
