skip to main content

SciTech ConnectSciTech Connect

Title: Linac-beam characterizations at 600 MeV using optical transition radiation diagnostics.

Selected optical diagnostics stations were upgraded in anticipation of low-emittance, bright electron beams from a thermionic rf gun or a photoelectric rf gun on the Advanced Photon Source (APS) injector linac. These upgrades include installation of optical transition radiation (OTR) screens, transport lines, and cameras for use in transverse beam size measurements and longitudinal profile measurements. Using beam from the standard thermionic gun, tests were done at 50 MeV and 400 to 650 MeV. Data were obtained on the limiting spatial ({sigma} {approximately} 200 {micro}m) and temporal resolution (300 ms) of the Chromox (Al{sub 2}O{sub 3} : Cr) screen (250-{micro}n thick) in comparison to the OTR screens. Both charge-coupled device (CCD) and charge-injection device (CID) video cameras were used as well as the Hamamatsu C5680 synchroscan streak camera operating at a vertical deflection rate of 119.0 MHz (the 24th subharmonic of the S-band 2856-MHz frequency). Beam transverse sizes as small as {sigma}{sub x} = 60 {micro}m for a 600-MeV beam and micropulse bunch lengths of {sigma}{sub {tau}}<3 ps have been recorded for macropulse-averaged behavior with charges of about 2 to 3 nC per macropulse. These techniques are applicable to linac-driven, fourth-generation light source R and D experiments including the APS'smore » SASE FEL experiment.« less
Authors:
Publication Date:
OSTI Identifier:
10700
Report Number(s):
ANL/ASD/CP-95937
TRN: US0103811
DOE Contract Number:
W-31109-ENG-38
Resource Type:
Conference
Resource Relation:
Conference: Beam Instrumentation Workshop (BIW'98), Palo Alto, CA (US), 05/04/1998--05/07/1998; Other Information: PBD: 27 May 1998
Research Org:
Argonne National Lab., IL (US)
Sponsoring Org:
US Department of Energy (US)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; ADVANCED PHOTON SOURCE; ELECTRON BEAMS; RESOLUTION; STREAK CAMERAS; TELEVISION CAMERAS; OPTICS; BEAM DYNAMICS; DIAGNOSTIC TECHNIQUES; BEAM INJECTION; BEAM BUNCHING; LIGHT SOURCES