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Title: Experimental Investigation of Multibunch, Multipass Beam Breakup in the Jefferson Laboratory Free Electron Laser Upgrade Driver

Abstract

In recirculating accelerators, and in particular energy recovery linacs (ERLs), the maximum current can be limited by multipass, multibunch beam breakup (BBU), which occurs when the electron beam interacts with the higher-order modes (HOMs) of an accelerating cavity on the accelerating pass and again on the energy recovering pass. This effect is of particular concern in the design of modern high average current energy recovery accelerators utilizing superconducting RF technology. Experimental characterization and observations of the instability at the Jefferson Laboratory 10 kW Free Electron Laser (FEL) are presented. Measurements of the threshold current for the instability are made under a variety of beam conditions and compared to the predictions of several BBU simulation codes. This represents the first time in which the codes have been experimentally benchmarked. With BBU posing a threat to high current beam operation in the FEL Driver, several suppression schemes were developed.

Authors:
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Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA
Sponsoring Org.:
USDOE - Office of Energy Research (ER)
OSTI Identifier:
877957
Report Number(s):
JLAB-ACP-06-479; DOE/ER/40150-3825
TRN: US0601421
DOE Contract Number:  
AC05-84ER40150
Resource Type:
Journal Article
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; ACCELERATORS; CEBAF ACCELERATOR; DESIGN; ELECTRON BEAMS; ENERGY RECOVERY; FREE ELECTRON LASERS; INSTABILITY; LINEAR ACCELERATORS; SIMULATION; THRESHOLD CURRENT

Citation Formats

Christopher Tennant, David Douglas, Kevin Jordan, Nikolitsa Merminga, Eduard Pozdeyev, Haipeng Wang, Todd I. Smith, Stefan Simrock, Ivan Bazarov, and Georg Hoffstaetter. Experimental Investigation of Multibunch, Multipass Beam Breakup in the Jefferson Laboratory Free Electron Laser Upgrade Driver. United States: N. p., 2006. Web.
Christopher Tennant, David Douglas, Kevin Jordan, Nikolitsa Merminga, Eduard Pozdeyev, Haipeng Wang, Todd I. Smith, Stefan Simrock, Ivan Bazarov, & Georg Hoffstaetter. Experimental Investigation of Multibunch, Multipass Beam Breakup in the Jefferson Laboratory Free Electron Laser Upgrade Driver. United States.
Christopher Tennant, David Douglas, Kevin Jordan, Nikolitsa Merminga, Eduard Pozdeyev, Haipeng Wang, Todd I. Smith, Stefan Simrock, Ivan Bazarov, and Georg Hoffstaetter. Fri . "Experimental Investigation of Multibunch, Multipass Beam Breakup in the Jefferson Laboratory Free Electron Laser Upgrade Driver". United States. doi:. https://www.osti.gov/servlets/purl/877957.
@article{osti_877957,
title = {Experimental Investigation of Multibunch, Multipass Beam Breakup in the Jefferson Laboratory Free Electron Laser Upgrade Driver},
author = {Christopher Tennant and David Douglas and Kevin Jordan and Nikolitsa Merminga and Eduard Pozdeyev and Haipeng Wang and Todd I. Smith and Stefan Simrock and Ivan Bazarov and Georg Hoffstaetter},
abstractNote = {In recirculating accelerators, and in particular energy recovery linacs (ERLs), the maximum current can be limited by multipass, multibunch beam breakup (BBU), which occurs when the electron beam interacts with the higher-order modes (HOMs) of an accelerating cavity on the accelerating pass and again on the energy recovering pass. This effect is of particular concern in the design of modern high average current energy recovery accelerators utilizing superconducting RF technology. Experimental characterization and observations of the instability at the Jefferson Laboratory 10 kW Free Electron Laser (FEL) are presented. Measurements of the threshold current for the instability are made under a variety of beam conditions and compared to the predictions of several BBU simulation codes. This represents the first time in which the codes have been experimentally benchmarked. With BBU posing a threat to high current beam operation in the FEL Driver, several suppression schemes were developed.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Mar 24 00:00:00 EST 2006},
month = {Fri Mar 24 00:00:00 EST 2006}
}