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Title: The status of normal conducting RF (NCRF) guns; a summary of the ERL2005 Workshop

Abstract

The 32nd Advanced ICFA Beam Dynamics Workshop on Energy Recovering Linacs (ERL2005) was held at Jefferson Laboratory, March 20 to 23, 2005. A wide range of ERL-related topics were presented and discussed in several working groups with Working Group 1 concentrated upon the physics and technology issues for DC, superconducting RF (SRF) and normal conducting RF (NCRF) guns. This paper summarizes the NCRF gun talks and reviews the status of NCRF gun technology. It begins with the presentations made on the subject of low-frequency, high-duty factor guns most appropriate for ERLs. One such gun at 433MHz was demonstrated at 25%DF in 1992, while the CW and much improved version is currently being constructed at 700MHz for LANL. In addition, the idea of combining the NCRF gun with a SRF linac booster was presented and is described in this paper. There was also a talk on high-field guns typically used for SASE free electron lasers. In particular, the DESY coaxial RF feed design provides rotationally symmetric RF fields and greater flexibility in the placement of the focusing magnetic field. While in the LCLS approach, the symmetric fields are obtained with a dual RF feed and racetrack cell shape. Although these gunsmore » cannot be operated at high-duty factor, they do produce the best quality beams. With these limitations in mind, a section with material not presented at the workshop has been included in the paper. This work describes a re-entrant approach which may allow NCRF guns to operate with simultaneously increased RF fields and duty factors. And finally, a novel proposal describing a high-duty factor, two-frequency RF gun using a field emission source instead of a laser driven photocathode was also presented.« less

Authors:
; ; ;
Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Sponsoring Org.:
USDOE - Office of Energy Research (ER)
OSTI Identifier:
876021
Report Number(s):
JLAB-ACC-05-353; DOE/ER/40150-3717
TRN: US0600950
DOE Contract Number:  
AC05-84ER40150
Resource Type:
Conference
Resource Relation:
Conference: The 32nd Advanced ICFA Beam Dynamics Workshop on Energy Recovering Linacs (ERL 2005), March 19 - 23, 2005, Newport News, Va, USA
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; BEAM DYNAMICS; CEBAF ACCELERATOR; DESIGN; FIELD EMISSION; FLEXIBILITY; FOCUSING; FREE ELECTRON LASERS; LANL; LASERS; LINEAR ACCELERATORS; MAGNETIC FIELDS; PHOTOCATHODES; PHYSICS; SHAPE

Citation Formats

Dowell, D H, Lewellen, J W, Nguyen, D, and Rimmer, R A. The status of normal conducting RF (NCRF) guns; a summary of the ERL2005 Workshop. United States: N. p., 2005. Web.
Dowell, D H, Lewellen, J W, Nguyen, D, & Rimmer, R A. The status of normal conducting RF (NCRF) guns; a summary of the ERL2005 Workshop. United States.
Dowell, D H, Lewellen, J W, Nguyen, D, and Rimmer, R A. 2005. "The status of normal conducting RF (NCRF) guns; a summary of the ERL2005 Workshop". United States. https://www.osti.gov/servlets/purl/876021.
@article{osti_876021,
title = {The status of normal conducting RF (NCRF) guns; a summary of the ERL2005 Workshop},
author = {Dowell, D H and Lewellen, J W and Nguyen, D and Rimmer, R A},
abstractNote = {The 32nd Advanced ICFA Beam Dynamics Workshop on Energy Recovering Linacs (ERL2005) was held at Jefferson Laboratory, March 20 to 23, 2005. A wide range of ERL-related topics were presented and discussed in several working groups with Working Group 1 concentrated upon the physics and technology issues for DC, superconducting RF (SRF) and normal conducting RF (NCRF) guns. This paper summarizes the NCRF gun talks and reviews the status of NCRF gun technology. It begins with the presentations made on the subject of low-frequency, high-duty factor guns most appropriate for ERLs. One such gun at 433MHz was demonstrated at 25%DF in 1992, while the CW and much improved version is currently being constructed at 700MHz for LANL. In addition, the idea of combining the NCRF gun with a SRF linac booster was presented and is described in this paper. There was also a talk on high-field guns typically used for SASE free electron lasers. In particular, the DESY coaxial RF feed design provides rotationally symmetric RF fields and greater flexibility in the placement of the focusing magnetic field. While in the LCLS approach, the symmetric fields are obtained with a dual RF feed and racetrack cell shape. Although these guns cannot be operated at high-duty factor, they do produce the best quality beams. With these limitations in mind, a section with material not presented at the workshop has been included in the paper. This work describes a re-entrant approach which may allow NCRF guns to operate with simultaneously increased RF fields and duty factors. And finally, a novel proposal describing a high-duty factor, two-frequency RF gun using a field emission source instead of a laser driven photocathode was also presented.},
doi = {},
url = {https://www.osti.gov/biblio/876021}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Sat Mar 19 00:00:00 EST 2005},
month = {Sat Mar 19 00:00:00 EST 2005}
}

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