HB2014 - List of Authors (Kolski, J.S.)

Paper

Title

Page

Proposed Varying Amplitude Raster Pattern to Uniformly Cover Target for the Isotope Production Facility (IPF) at LANSCE

148

J.S. Kolski
LANL, Los Alamos, New Mexico, USA

The Isotope Production Facility (IPF) at LANSCE produces medical isotopes strontium-82 and germanium-68 by bombarding rubidium chloride and gallium metal targets respectively with a 100 MeV proton beam, 230 uA average current. Rastering the proton beam is necessary to distribute heat load on the target and target window, allowing higher average beam current for isotope production. Currently, we use a simple circular raster pattern with constant amplitude and frequency. The constant amplitude raster pattern does not expose the target center to beam and few isotopes are produced there. We propose a raster pattern with varying amplitude to increase isotope production at the target center, achieve uniform beam flux over the target, and expose more of the target surface to beam heating. Using multiparticle simulations, we discuss the uniformity of target coverage using the proposed varying amplitude raster pattern, compare with the constant amplitude raster pattern currently used, and consider dependencies on transverse beam size, beam centroid offset, and macropulse length and repetition rate.

Poster MOPAB46 [7.847 MB]

TUO3LR01

Understanding Beam Losses in High Intensity Proton Accumulator Rings

192

R.J. Macek, J.S. Kolski
LANL, Los Alamos, New Mexico, USA

Funding: U.S. Department of Energy under contract DE-AC52-06NA25396
Beam losses and the resulting radio-activation of accelerator components are major considerations governing the operations, development and performance of medium-energy, high-intensity proton accumulator rings such as the Los Alamos Proton Storage Ring (PSR). Several beam loss mechanisms contribute including beam scattering (nuclear and large angle Coulomb scattering) in the injection foil, production of excited states of H⁰ in the H⁻ injection stripper foil that subsequently field strip in the magnetic fields down stream of the foil, halo growth from space charge effects, beam instabilities and losses from the fast extraction process. This talk will cover progress in the diagnosis, measurement, and modeling of beam losses at PSR with some comparisons to other rings. The roles the computer codes MAD8*, ORBIT**, G4Beamline***, and others used in modeling beam losses will be discussed and the modeling results compared with relevant experimental data. Concepts and prospects for future improvements such as laser striping for injection will be discussed at the end of the presentation.
* F. Christoph Iselin, The MAD Program, 1994, CERN-BE/ABP
** J. A. Holmes, ICFA BD Newsletter, No 30, page100, 2003.
*** Muons, Inc, G4Beamline, http://www.muonsinternal.com/muons3/Computer+Programs

Slides TUO3LR01 [1.947 MB]

Paper	Title	Page
MOPAB46	Proposed Varying Amplitude Raster Pattern to Uniformly Cover Target for the Isotope Production Facility (IPF) at LANSCE	148
	J.S. Kolski LANL, Los Alamos, New Mexico, USA
	The Isotope Production Facility (IPF) at LANSCE produces medical isotopes strontium-82 and germanium-68 by bombarding rubidium chloride and gallium metal targets respectively with a 100 MeV proton beam, 230 uA average current. Rastering the proton beam is necessary to distribute heat load on the target and target window, allowing higher average beam current for isotope production. Currently, we use a simple circular raster pattern with constant amplitude and frequency. The constant amplitude raster pattern does not expose the target center to beam and few isotopes are produced there. We propose a raster pattern with varying amplitude to increase isotope production at the target center, achieve uniform beam flux over the target, and expose more of the target surface to beam heating. Using multiparticle simulations, we discuss the uniformity of target coverage using the proposed varying amplitude raster pattern, compare with the constant amplitude raster pattern currently used, and consider dependencies on transverse beam size, beam centroid offset, and macropulse length and repetition rate.
	Poster MOPAB46 [7.847 MB]

TUO3LR01	Understanding Beam Losses in High Intensity Proton Accumulator Rings	192
	R.J. Macek, J.S. Kolski LANL, Los Alamos, New Mexico, USA
	Funding: U.S. Department of Energy under contract DE-AC52-06NA25396 Beam losses and the resulting radio-activation of accelerator components are major considerations governing the operations, development and performance of medium-energy, high-intensity proton accumulator rings such as the Los Alamos Proton Storage Ring (PSR). Several beam loss mechanisms contribute including beam scattering (nuclear and large angle Coulomb scattering) in the injection foil, production of excited states of H⁰ in the H⁻ injection stripper foil that subsequently field strip in the magnetic fields down stream of the foil, halo growth from space charge effects, beam instabilities and losses from the fast extraction process. This talk will cover progress in the diagnosis, measurement, and modeling of beam losses at PSR with some comparisons to other rings. The roles the computer codes MAD8, ORBIT, G4Beamline*, and others used in modeling beam losses will be discussed and the modeling results compared with relevant experimental data. Concepts and prospects for future improvements such as laser striping for injection will be discussed at the end of the presentation. F. Christoph Iselin, The MAD Program, 1994, CERN-BE/ABP J. A. Holmes, ICFA BD Newsletter, No 30, page100, 2003. * Muons, Inc, G4Beamline, http://www.muonsinternal.com/muons3/Computer+Programs
	Slides TUO3LR01 [1.947 MB]