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BERKELEY: ALS ring

Abstract

Everybody at Lawrence Berkeley Laboratory's Center for Beam Physics is pleased with the rapid progress in commissioning LBL's Advanced Light Source (ALS) electron storage ring, the foundation for this third-generation synchrotron radiation facility. Designed for a maximum current of 400 mA, the ALS storage ring reached 407 mA just 24 days after storing the first beam on 16 March. ALS construction as a US Department of Energy (DOE) national user facility to provide high-brightness vacuum ultra-violet and soft x-ray radiation began in October 1987. One technical requirement marking project completion was to accumulate a 50-mA current in the storage ring. The ALS passed this milestone on 24 March, a week ahead of the official deadline. Once injected, the electron beam decays quasi-exponentially primarily because of interactions with residual gas molecules in the storage-ring vacuum chamber. Eventually, when the pressure in the vacuum chamber with beam decreases toward the expected operating level of 1 nano Torr, it will only be necessary to refill the storage ring at intervals of four to eight hours. At present the vacuum is improving rapidly as surfaces are irradiated (scrubbed) by the synchrotron radiation itself. At 100 mA, beam lifetime was about one hour (9 April)
Authors:
Publication Date:
Jun 15, 1993
Product Type:
Journal Article
Report Number:
INIS-XC-15A0913
Resource Relation:
Journal Name: CERN Courier; Journal Volume: 33; Journal Issue: 5; Other Information: 1 fig.; Country of input: International Atomic Energy Agency (IAEA)
Subject:
43 PARTICLE ACCELERATORS; ADVANCED LIGHT SOURCE; COMMISSIONING; CONSTRUCTION; ELECTRON BEAMS; LAWRENCE BERKELEY LABORATORY; SOFT X RADIATION; SYNCHROTRON RADIATION
OSTI ID:
22458895
Country of Origin:
CERN
Language:
English
Other Identifying Numbers:
Journal ID: ISSN 0304-288X; CODEN: CECOA2; TRN: XC15A0913028490
Availability:
Also available on-line: http://cds.cern.ch/record/1732152/files/vol33-issue5-p008-e.pdf
Submitting Site:
INIS
Size:
page(s) 8-9
Announcement Date:
Mar 25, 2016

Citation Formats

Anon. BERKELEY: ALS ring. CERN: N. p., 1993. Web.
Anon. BERKELEY: ALS ring. CERN.
Anon. 1993. "BERKELEY: ALS ring." CERN.
@misc{etde_22458895,
title = {BERKELEY: ALS ring}
author = {Anon.}
abstractNote = {Everybody at Lawrence Berkeley Laboratory's Center for Beam Physics is pleased with the rapid progress in commissioning LBL's Advanced Light Source (ALS) electron storage ring, the foundation for this third-generation synchrotron radiation facility. Designed for a maximum current of 400 mA, the ALS storage ring reached 407 mA just 24 days after storing the first beam on 16 March. ALS construction as a US Department of Energy (DOE) national user facility to provide high-brightness vacuum ultra-violet and soft x-ray radiation began in October 1987. One technical requirement marking project completion was to accumulate a 50-mA current in the storage ring. The ALS passed this milestone on 24 March, a week ahead of the official deadline. Once injected, the electron beam decays quasi-exponentially primarily because of interactions with residual gas molecules in the storage-ring vacuum chamber. Eventually, when the pressure in the vacuum chamber with beam decreases toward the expected operating level of 1 nano Torr, it will only be necessary to refill the storage ring at intervals of four to eight hours. At present the vacuum is improving rapidly as surfaces are irradiated (scrubbed) by the synchrotron radiation itself. At 100 mA, beam lifetime was about one hour (9 April)}
journal = {CERN Courier}
issue = {5}
volume = {33}
journal type = {AC}
place = {CERN}
year = {1993}
month = {Jun}
}