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Title: Klystron 'efficiency loop' for the ALS storage ring RF system

Abstract

The recent energy crisis in California has led us to investigate the high power RF systems at the Advanced Light Source (ALS) in order to decrease the energy consumption and power costs. We found the Storage Ring Klystron Power Amplifier system operating as designed but with significant power waste. A simple proportional-integrator (PI) analog loop, which controls the klystron collector beam current, as a function of the output RF power, has been designed and installed. The design considerations, besides efficiency improvement, were to interface to the existing system without major expense. They were to also avoid the klystron cathode power supply filter's resonance in the loop's dynamics, and prevent a conflict with the existing Cavity RF Amplitude Loop dynamics. This efficiency loop will allow us to save up to 700 MW-hours of electrical energy per year and increase the lifetime of the klystron.

Authors:
; ;
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Director, Office of Science. Office of High Energy and Nuclear Physics. Division of Nuclear Physics (US)
OSTI Identifier:
799603
Report Number(s):
LBNL-50405
R&D Project: 458030; B& R KC0204016; TRN: US0202318
DOE Contract Number:  
AC03-76SF00098
Resource Type:
Conference
Resource Relation:
Conference: EPAC 2002, PARIS (FR), 06/03/2002--06/07/2002; Other Information: PBD: 20 May 2002
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; 42 ENGINEERING; ADVANCED LIGHT SOURCE; AMPLITUDES; BEAM CURRENTS; CALIFORNIA; CATHODES; DESIGN; EFFICIENCY; ENERGY CONSUMPTION; KLYSTRONS; LIFETIME; POWER AMPLIFIERS; RESONANCE; RF SYSTEMS; STORAGE RINGS; KLYSTRON LIGHT SOURCE FEEDBACK

Citation Formats

Kwiatkowski, Slawomir, Julian, Jim, and Baptiste, Kenneth. Klystron 'efficiency loop' for the ALS storage ring RF system. United States: N. p., 2002. Web.
Kwiatkowski, Slawomir, Julian, Jim, & Baptiste, Kenneth. Klystron 'efficiency loop' for the ALS storage ring RF system. United States.
Kwiatkowski, Slawomir, Julian, Jim, and Baptiste, Kenneth. Mon . "Klystron 'efficiency loop' for the ALS storage ring RF system". United States. https://www.osti.gov/servlets/purl/799603.
@article{osti_799603,
title = {Klystron 'efficiency loop' for the ALS storage ring RF system},
author = {Kwiatkowski, Slawomir and Julian, Jim and Baptiste, Kenneth},
abstractNote = {The recent energy crisis in California has led us to investigate the high power RF systems at the Advanced Light Source (ALS) in order to decrease the energy consumption and power costs. We found the Storage Ring Klystron Power Amplifier system operating as designed but with significant power waste. A simple proportional-integrator (PI) analog loop, which controls the klystron collector beam current, as a function of the output RF power, has been designed and installed. The design considerations, besides efficiency improvement, were to interface to the existing system without major expense. They were to also avoid the klystron cathode power supply filter's resonance in the loop's dynamics, and prevent a conflict with the existing Cavity RF Amplitude Loop dynamics. This efficiency loop will allow us to save up to 700 MW-hours of electrical energy per year and increase the lifetime of the klystron.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon May 20 00:00:00 EDT 2002},
month = {Mon May 20 00:00:00 EDT 2002}
}

Conference:
Other availability
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