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Title: Location of Maximum Credible Beam Losses in LCLS Injector

Abstract

The memo describes the maximum credible beam the LCLS injector can produce and lose at various locations along the beamline. The estimation procedure is based upon three previous reports [1, 2, 3]. While specific numbers have been updated to accurately reflect the present design parameters, the conclusions are very similar to those given in Ref 1. The source of the maximum credible beam results from the explosive electron emission from the photocathode if the drive laser intensity exceeds the threshold for plasma production. In this event, the gun's RF field can extract a large number of electrons from this plasma which are accelerated out of the gun and into the beamline. This electron emission persists until it has depleted the gun of all its energy. Hence the number of electrons emitted per pulse is limited by the amount of stored RF energy in the gun. It needs to be emphasized that this type of emission is highly undesirable, as it causes permanent damage to the cathode.

Authors:
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1000392
Report Number(s):
SLAC-TN-10-086
TRN: US1100104
DOE Contract Number:  
AC02-76SF00515
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; LIGHT SOURCES; FREE ELECTRON LASERS; LINEAR ACCELERATORS; ELECTRON BEAM INJECTION; ENERGY LOSSES; DESIGN; ELECTRON EMISSION; PHOTOCATHODES; PLASMA PRODUCTION; XFEL

Citation Formats

Mao, Stan. Location of Maximum Credible Beam Losses in LCLS Injector. United States: N. p., 2010. Web. doi:10.2172/1000392.
Mao, Stan. Location of Maximum Credible Beam Losses in LCLS Injector. United States. doi:10.2172/1000392.
Mao, Stan. Mon . "Location of Maximum Credible Beam Losses in LCLS Injector". United States. doi:10.2172/1000392. https://www.osti.gov/servlets/purl/1000392.
@article{osti_1000392,
title = {Location of Maximum Credible Beam Losses in LCLS Injector},
author = {Mao, Stan},
abstractNote = {The memo describes the maximum credible beam the LCLS injector can produce and lose at various locations along the beamline. The estimation procedure is based upon three previous reports [1, 2, 3]. While specific numbers have been updated to accurately reflect the present design parameters, the conclusions are very similar to those given in Ref 1. The source of the maximum credible beam results from the explosive electron emission from the photocathode if the drive laser intensity exceeds the threshold for plasma production. In this event, the gun's RF field can extract a large number of electrons from this plasma which are accelerated out of the gun and into the beamline. This electron emission persists until it has depleted the gun of all its energy. Hence the number of electrons emitted per pulse is limited by the amount of stored RF energy in the gun. It needs to be emphasized that this type of emission is highly undesirable, as it causes permanent damage to the cathode.},
doi = {10.2172/1000392},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2010},
month = {12}
}

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