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Title: Overview of Current Progress on the LLNL Nuclear Photonics Facility and Mono-energetic Gamma-ray Source

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; more »; ; ; « less
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1261085
Report Number(s):
SLAC-PUB-16592
DOE Contract Number:
AC02-76SF00515
Resource Type:
Conference
Resource Relation:
Journal Name: Conf.Proc.C110328:2456-2458,2011; Conference: Presented at Particle Accelerator, 24th Conference (PAC'11) 28 Mar - 1 Apr 2011, New York, USA
Country of Publication:
United States
Language:
English
Subject:
Accelerators,ACCPHY

Citation Formats

Hartemann, F.V., Albert, F., Anderson, S.G., Bayramian, A.J., Cross, R.R., Ebbers, C.A., Gibson, D.J., Houck, T.L., Marsh, R.A., Messerly, M.J., Siders, C.W., McNabb, D.P., Barty, C.P.J., /LLNL, Livermore, Adolphsen, C.E., Chu, T.S., Jongewaard, E.N., Tantawi, S.G., Vlieks, A.E., Wang, F., Wang, J.W., Raubenheimer, T.O., and /SLAC. Overview of Current Progress on the LLNL Nuclear Photonics Facility and Mono-energetic Gamma-ray Source. United States: N. p., 2016. Web.
Hartemann, F.V., Albert, F., Anderson, S.G., Bayramian, A.J., Cross, R.R., Ebbers, C.A., Gibson, D.J., Houck, T.L., Marsh, R.A., Messerly, M.J., Siders, C.W., McNabb, D.P., Barty, C.P.J., /LLNL, Livermore, Adolphsen, C.E., Chu, T.S., Jongewaard, E.N., Tantawi, S.G., Vlieks, A.E., Wang, F., Wang, J.W., Raubenheimer, T.O., & /SLAC. Overview of Current Progress on the LLNL Nuclear Photonics Facility and Mono-energetic Gamma-ray Source. United States.
Hartemann, F.V., Albert, F., Anderson, S.G., Bayramian, A.J., Cross, R.R., Ebbers, C.A., Gibson, D.J., Houck, T.L., Marsh, R.A., Messerly, M.J., Siders, C.W., McNabb, D.P., Barty, C.P.J., /LLNL, Livermore, Adolphsen, C.E., Chu, T.S., Jongewaard, E.N., Tantawi, S.G., Vlieks, A.E., Wang, F., Wang, J.W., Raubenheimer, T.O., and /SLAC. 2016. "Overview of Current Progress on the LLNL Nuclear Photonics Facility and Mono-energetic Gamma-ray Source". United States. doi:. https://www.osti.gov/servlets/purl/1261085.
@article{osti_1261085,
title = {Overview of Current Progress on the LLNL Nuclear Photonics Facility and Mono-energetic Gamma-ray Source},
author = {Hartemann, F.V. and Albert, F. and Anderson, S.G. and Bayramian, A.J. and Cross, R.R. and Ebbers, C.A. and Gibson, D.J. and Houck, T.L. and Marsh, R.A. and Messerly, M.J. and Siders, C.W. and McNabb, D.P. and Barty, C.P.J. and /LLNL, Livermore and Adolphsen, C.E. and Chu, T.S. and Jongewaard, E.N. and Tantawi, S.G. and Vlieks, A.E. and Wang, F. and Wang, J.W. and Raubenheimer, T.O. and /SLAC},
abstractNote = {},
doi = {},
journal = {Conf.Proc.C110328:2456-2458,2011},
number = ,
volume = ,
place = {United States},
year = 2016,
month = 7
}

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  • Recent progress in accelerator physics and laser technology have enabled the development of a new class of tunable gamma-ray light sources based on Compton scattering between a high-brightness, relativistic electron beam and a high intensity laser pulse produced via chirped-pulse amplification (CPA). A precision, tunable Mono-Energetic Gamma-ray (MEGa-ray) source driven by a compact, high-gradient X-band linac is currently under development and construction at LLNL. High-brightness, relativistic electron bunches produced by an X-band linac designed in collaboration with SLAC NAL will interact with a Joule-class, 10 ps, diode-pumped CPA laser pulse to generate tunable {gamma}-rays in the 0.5-2.5 MeV photon energymore » range via Compton scattering. This MEGa-ray source will be used to excite nuclear resonance fluorescence in various isotopes. Applications include homeland security, stockpile science and surveillance, nuclear fuel assay, and waste imaging and assay. The source design, key parameters, and current status are presented, along with important applications, including nuclear resonance fluorescence. In conclusion, we have optimized the design of a high brightness Compton scattering gamma-ray source, specifically designed for NRF applications. Two different parameters sets have been considered: one where the number of photons scattered in a single shot reaches approximately 7.5 x 10{sup 8}, with a focal spot size around 8 {micro}m; in the second set, the spectral brightness is optimized by using a 20 {micro}m spot size, with 0.2% relative bandwidth.« less
  • Recent progress in accelerator physics and laser technology have enabled the development of a new class of tunable gamma-ray light sources based on Compton scattering between a high-brightness, relativistic electron beam and a high intensity laser pulse produced via chirped-pulse amplification (CPA). A precision, tunable Mono-Energetic Gamma-ray (MEGa-ray) source driven by a compact, high-gradient X-band linac is currently under development and construction at LLNL. High-brightness, relativistic electron bunches produced by an X-band linac designed in collaboration with SLAC NAL will interact with a Joule-class, 10 ps, diode-pumped CPA laser pulse to generate tunable {gamma}-rays in the 0.5-2.5 MeV photon energymore » range via Compton scattering. This MEGaray source will be used to excite nuclear resonance fluorescence in various isotopes. Applications include homeland security, stockpile science and surveillance, nuclear fuel assay, and waste imaging and assay. The source design, key parameters, and current status are presented, along with important applications, including nuclear resonance fluorescence.« less
  • A Mono-energetic Gamma-ray (MEGa-ray) source, based on Compton scattering of a high-intensity laser beam off a highly relativistic electron beam, requires highly specialized laser systems. To minimize the bandwidth of the {gamma}-ray beam, the scattering laser must have minimal bandwidth, but also match the electron beam depth of focus in length. This requires a {approx}1 J, 10 ps, fourier-transform-limited laser system. Also required is a high-brightness electron beam, best provided by a photoinjector. This electron source requires a second laser system with stringent requirements on the beam including flat transverse and longitudinal profiles and fast rise times. Furthermore, these systemsmore » must be synchronized to each other with ps-scale accuracy. Using a novel hyper-dispersion compressor configuration and advanced fiber amplifiers and diode-pumped Nd:YAG amplifiers, we have designed laser systems that meet these challenges for the X-band photoinjector and Compton-scattering source being built at Lawrence Livermore National Laboratory.« less
  • This paper presents Facility Management, Readiness Assessment, and Authorization Basis experience gained and lessons learned during the Heavy Element Facility Risk Reduction Program (RRP). The RRP was tasked with removing contaminated glove boxes, radioactive inventory, and contaminated ventilation systems from the Heavy Element Facility (B251) at Lawrence Livermore National Laboratory (LLNL). The RRP was successful in its goal in April 2005 with the successful downgrade of B251 from a Category II Nuclear Facility to a Radiological Facility. The expertise gained and the lessons learned during the planning and conduct of the RRP included development of unique approaches in work planning/workmore » control (''Expect the unexpected and confirm the expected'') and facility management. These approaches minimized worker dose and resulted in significant safety improvements and operational efficiencies. These lessons learned can help similar operational and management activities at other sites, including facilities restarting operations or new facility startup. B251 was constructed at LLNL to provide research areas for conducting experiments in radiochemistry using transuranic elements. Activities at B251 once included the preparation of tracer sets associated with the underground testing of nuclear devices and basic research devoted to a better understanding of the chemical and nuclear behavior of the transuranic elements. Due to the age of the facility, even with preventative maintenance, facility safety and experimental systems were deteriorating. A variety of seismic standards were used in the facility design and construction, which encompassed eight building increments constructed over a period of 26 years. The cost to bring the facility into compliance with the current seismic and other requirements was prohibitive, and simply maintaining B251 as a Category II nuclear facility posed serious cost considerations under a changing regulatory environment. Considering the high cost of maintenance and seismic upgrades, the RRP was created to mitigate the risk of dispersal of radioactive material during an earthquake by removing the radioactive materials inventory and glove box contamination. LLNL adopted the goal of reducing the hazard categorization of the Facility from a Category II Nuclear Facility to a Radiological Facility. To support the RRP, B251 transitioned from a standby to a fully operational Category II Nuclear Facility, compliant with current regulations. A work control process was developed, procedures were developed, Authorization Basis Documents were created, work plans were written, off-normal drills practiced, a large number of USQ reviews were conducted, and a ''Type II'' Readiness Assessment (RA) was conducted to restart operations. Subsequent RA's focused on specific operations. Finally, a four-step process was followed to reach Radiological Status: (1) Inventory Reduction and D&D activities reduced the inventory and radiological contamination of the facility below the Category III threshold (DOE-STD-1027), (2) Radiological Safety Basis Document (SBD aka HAR) was approved by NNSA, (3) the inventory control system for a Radiological Facility was implemented, and (4) verification by NNSA of radiological status was completed.« less