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Title: The LINAC Coherent Light Source and Radiological Issues During the Commissioning

Abstract

The Linac Coherent Light Source (LCLS) at SLAC National Accelerator Laboratory is the world's first X-ray free electron laser (XFEL). Pulses of x-ray laser light from LCLS will be many orders of magnitude brighter and several orders of magnitude shorter than what can be produced by other x-ray sources available in the world. These characteristics will enable frontier new science in many areas. This paper describes the LCLS beam parameters and lay-out. The general radiological issues during commissioning are presented, such as radiation dose rates and integrated doses outside the enclosure. Also, specific radiological issues related to X-ray free electron lasers are discussed. XFEL with high peak power will burn through high-Z materials. The X-ray beam needs to be blocked by stoppers when the downstream areas are occupied. LCLS stoppers feature a piece of boron carbide (B{sub 4}C), 10 mm thick. B{sub 4}C is one of the best materials since it has a low absorption coefficient for X-rays and a high melting temperature. Theoretical calculations indicate that the unfocused fluence of the LCLS XFEL beam should be about one order of magnitude below the damage threshold for bulk B{sub 4}C, for 830 eV FEL radiation. However, these calculations have notmore » been tested experimentally and cannot be validated until LCLS begins providing 830 eV XFEL pulses. This paper describes the test plan for using the initial LCLS radiation to evaluate the survivability of B{sub 4}C and reports the preliminary results. Another major issue for LCLS is the potential radiation damage to the LCLS undulator magnets during operation. TLD dosimeters were installed along the LCLS undulators for each period of two or three weeks. This paper reports the integrated doses along the undulators with and without XFEL generation.« less

Authors:
; ; ;
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
992447
Report Number(s):
SLAC-PUB-13776
DOE Contract Number:  
AC02-76SF00515
Resource Type:
Conference
Journal Name:
Submitted to Nuclear Instrumentation and Methods (NIM)
Additional Journal Information:
Conference: Presented at 11th International Symposium on Radiation Physics (ISRP-11), Melbourne, Australia, 20-25 Sep 2009
Country of Publication:
United States
Language:
English
Subject:
SAFETY, XFEL

Citation Formats

Mao, X.S., Leitner, M.Santana, Vollaire, J., and /SLAC. The LINAC Coherent Light Source and Radiological Issues During the Commissioning. United States: N. p., 2010. Web.
Mao, X.S., Leitner, M.Santana, Vollaire, J., & /SLAC. The LINAC Coherent Light Source and Radiological Issues During the Commissioning. United States.
Mao, X.S., Leitner, M.Santana, Vollaire, J., and /SLAC. Thu . "The LINAC Coherent Light Source and Radiological Issues During the Commissioning". United States. https://www.osti.gov/servlets/purl/992447.
@article{osti_992447,
title = {The LINAC Coherent Light Source and Radiological Issues During the Commissioning},
author = {Mao, X.S. and Leitner, M.Santana and Vollaire, J. and /SLAC},
abstractNote = {The Linac Coherent Light Source (LCLS) at SLAC National Accelerator Laboratory is the world's first X-ray free electron laser (XFEL). Pulses of x-ray laser light from LCLS will be many orders of magnitude brighter and several orders of magnitude shorter than what can be produced by other x-ray sources available in the world. These characteristics will enable frontier new science in many areas. This paper describes the LCLS beam parameters and lay-out. The general radiological issues during commissioning are presented, such as radiation dose rates and integrated doses outside the enclosure. Also, specific radiological issues related to X-ray free electron lasers are discussed. XFEL with high peak power will burn through high-Z materials. The X-ray beam needs to be blocked by stoppers when the downstream areas are occupied. LCLS stoppers feature a piece of boron carbide (B{sub 4}C), 10 mm thick. B{sub 4}C is one of the best materials since it has a low absorption coefficient for X-rays and a high melting temperature. Theoretical calculations indicate that the unfocused fluence of the LCLS XFEL beam should be about one order of magnitude below the damage threshold for bulk B{sub 4}C, for 830 eV FEL radiation. However, these calculations have not been tested experimentally and cannot be validated until LCLS begins providing 830 eV XFEL pulses. This paper describes the test plan for using the initial LCLS radiation to evaluate the survivability of B{sub 4}C and reports the preliminary results. Another major issue for LCLS is the potential radiation damage to the LCLS undulator magnets during operation. TLD dosimeters were installed along the LCLS undulators for each period of two or three weeks. This paper reports the integrated doses along the undulators with and without XFEL generation.},
doi = {},
journal = {Submitted to Nuclear Instrumentation and Methods (NIM)},
number = ,
volume = ,
place = {United States},
year = {2010},
month = {8}
}

Conference:
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