skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: A New RF System for the CEBAF Normal Conducting Cavities

Abstract

The CEBAF Accelerator at Jefferson Lab is a 6 GeV five pass electron accelerator consisting of two superconducting linacs joined by independent magnetic transport arcs. CEBAF also has numerous normal conducting cavities for beam conditioning in the injector and for RF extraction to the experimental halls. The RF systems that presently control these cavities are becoming expensive to maintain, therefore a replacement RF control system is now being developed. For the new RF system, cavity field control is maintained digitally using an FPGA which contains the feedback algorithm. The system incorporates digital down conversion, using quadrature under-sampling at an IF frequency of 70 MHz. The VXI bus-crate was chosen as the operating platform because of its excellent RFI/EMI properties and its compatibility with the EPICS control system. The normal conducting cavities operate at both the 1497 MHz accelerating frequency and the sub-harmonic frequency of 499 MHz. To accommodate this, the ne w design will use different receiver-transmitter daughter cards for each frequency. This paper discusses the development of the new RF system and reports on initial results.

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility, Newport News, VA (US)
Sponsoring Org.:
USDOE Office of Energy Research (ER) (US)
OSTI Identifier:
827980
Report Number(s):
JLAB-ACE-04-260; DOE/ER/40150-2837
TRN: US0403611
DOE Contract Number:  
AC05-84ER40150
Resource Type:
Conference
Resource Relation:
Conference: 22nd International Linear Accelerator Conference (LINAC 2004), Lubeck (DE), 08/16/2004--08/20/2004; Other Information: PBD: 1 Aug 2004
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; ACCELERATORS; CAVITIES; CEBAF ACCELERATOR; COMPATIBILITY; CONTROL SYSTEMS; ELECTRONS; FEEDBACK; LINEAR ACCELERATORS; QUADRATURES; RF SYSTEMS; TRANSPORT

Citation Formats

Curt Hovater, Hai Dong, Alicia Hofler, George Lahti, John Musson, and Tomasz Plawski. A New RF System for the CEBAF Normal Conducting Cavities. United States: N. p., 2004. Web.
Curt Hovater, Hai Dong, Alicia Hofler, George Lahti, John Musson, & Tomasz Plawski. A New RF System for the CEBAF Normal Conducting Cavities. United States.
Curt Hovater, Hai Dong, Alicia Hofler, George Lahti, John Musson, and Tomasz Plawski. Sun . "A New RF System for the CEBAF Normal Conducting Cavities". United States. doi:. https://www.osti.gov/servlets/purl/827980.
@article{osti_827980,
title = {A New RF System for the CEBAF Normal Conducting Cavities},
author = {Curt Hovater and Hai Dong and Alicia Hofler and George Lahti and John Musson and Tomasz Plawski},
abstractNote = {The CEBAF Accelerator at Jefferson Lab is a 6 GeV five pass electron accelerator consisting of two superconducting linacs joined by independent magnetic transport arcs. CEBAF also has numerous normal conducting cavities for beam conditioning in the injector and for RF extraction to the experimental halls. The RF systems that presently control these cavities are becoming expensive to maintain, therefore a replacement RF control system is now being developed. For the new RF system, cavity field control is maintained digitally using an FPGA which contains the feedback algorithm. The system incorporates digital down conversion, using quadrature under-sampling at an IF frequency of 70 MHz. The VXI bus-crate was chosen as the operating platform because of its excellent RFI/EMI properties and its compatibility with the EPICS control system. The normal conducting cavities operate at both the 1497 MHz accelerating frequency and the sub-harmonic frequency of 499 MHz. To accommodate this, the ne w design will use different receiver-transmitter daughter cards for each frequency. This paper discusses the development of the new RF system and reports on initial results.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Aug 01 00:00:00 EDT 2004},
month = {Sun Aug 01 00:00:00 EDT 2004}
}

Conference:
Other availability
Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that hold this conference proceeding.

Save / Share: