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Title: LANSCE Futures

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  1. Los Alamos National Laboratory
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Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
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Conference: Physics Colloquium ; 2017-09-28 - 2017-09-28 ; Los Alamos, New Mexico, United States
Country of Publication:
United States

Citation Formats

Sinnis, Constantine. LANSCE Futures. United States: N. p., 2017. Web.
Sinnis, Constantine. LANSCE Futures. United States.
Sinnis, Constantine. 2017. "LANSCE Futures". United States. doi:.
title = {LANSCE Futures},
author = {Sinnis, Constantine},
abstractNote = {},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2017,
month =

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  • The Los Alamos Neutron Science Center (LANSCE) accelerator is an 800-MeV proton linac that drives user facilities for isotope production, proton radiography, ultra-cold neutrons, weapons neutron research and various sciences using neutron scattering. The LANSCE Refurbishment Project (LANSCE-R) is an ambitious project to refurbish key elements of the LANSCE accelerator that are becoming obsolete or nearing end-of-life. The conceptual design phase for the project is funded and underway. The 5 year, $170M (US) project will enable future decades of reliable, high-performance operation. It will replace a substantial fraction of the radio-frequency power systems (gridded tubes and klystrons) with modern systems,more » completely refurbish the original accelerator control and timing systems, replace obsolete diagnostic devices, and modernize other ancillary systems. An overview of the LANSCE-R project will be presented. The functional and operating requirements will be discussed, the proposed technical solutions presented, and the plan for successful project execution while meeting annual customer expectations for beam delivery will be reviewed.« less
  • The heart of the LANSCE accelerator complex consists of Cockroft-Walton-type injectors, a drift-tube linac (DTL) and a side-coupled linac (CCL). These systems are approaching 40 years of age and a project to re-establish high-power capability and to extend the lifetime is underway. Many of the present beam diagnostic systems are difficult to maintain, and the original beam position monitors don't provide any data at all. These deficiencies hamper beam tuning and trouble-shooting efforts. One thrust of the refurbishment project is to restore reliable operation of the diagnostic systems. This paper describes the present diagnostics systems and their limitations and themore » envisaged next-generation systems. The emphasis will be on the uses and requirements for the systems rather than the solutions and engineering aspects of the refurbishment.« less
  • During the past few years we have made measurements of (n,p) and (n,{alpha}) cross sections on several radioactive nuclei of importance to nuclear astrophysics. The measurements were made at the Manuel Lujan, Jr., Neutron Scattering Center (LANSCE) from thermal neutron energy to approximately 100 keV. Successful measurements have been completed on the radioisotopes {sup 7}Be, {sup 22}Na and {sup 36}Cl while preliminary data have been taken on targets of {sup 54}Mn and {sup 55}Fe. Similar measurements have also been made on the stable isotopes {sup 14}N, {sup 17}O and {sup 35}Cl. We are currently assembling a 4{pi} barium fluoride (BaF{submore » 2}) detector which will allow us to expand our program to (n,{gamma}) measurements. The (n,{gamma}) (and in some cases future (n,p)) measurements will require targets with higher specific activity and greater chemical purity than we have so far been able to use. We discuss the fabrication techniques used for the samples produced so far, the requirements the future (n,{gamma}) targets must meet and our current plans for producing them, and the physics motivations for the measurements.« less
  • We describe the new chopper spectrometer PHAROS under design at Los Alamos. It is intended to provide 0.5% incident energy resolution for incident energies between 50 MeV and 2 eV. This will be achieved with a methane moderator and a 20m incident flight path on Flight Path 16 of the Los Alamos Neutron Scattering Center. The secondary flight path will be 4m for scattering angles between 10/degree/ and 140/degree/. For small scattering angles (down to 0.5/degree/), the secondary flight path can be extended to 10m. We include results of preliminary tests on phasing a prototype chopper and the Proton Storagemore » Ring. These show that phasing can be achieved and that the width of the transmitted neutron pulse is in reasonable agreement with calculation. 5 refs., 4 figs., 1 tab.« less
  • Neutrons produced by medium-energy (800-MeV) proton reactions at the Los Alamos Neutron Scattering Center spallation neutron source cause a variety of difficult shield problems. We describe the general shielding questions encountered at such a spallation source, and contrast spallation and reactor source shielding issues using an infinite slab-shield composed of 100 cm of iron and 15 cm of borated polyethylene. The calculations show that (for an incident spallation spectrum characteristic of neutrons leaking at 90 degrees from a tungsten target) high-energy neutrons dominate the dose at the shield surface. Secondary low-energy neutrons (produced by high-energy neutron attenuation) and attendant gamma-raysmore » add significantly to the dose. The primary low-energy neutrons produced directly at the tungsten source contribute negligibly to the dose, and behave similarly to neutrons with a fission spectrum distribution. 8 refs., 10 figs.« less