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New magnet pole shape for isochronous cyclotrons

Description: A new design has been developed for shaping pole tips to produce the radially increasing fields required for isochronous cyclotrons. The conventional solid hill poles are replaced by poles mounted over a small secondary gap which tapers radially from maximum at the magnet edge to zero near the center. Field measurements with a model magnet and calculations with the code TRIM show an increase in field at the edge of the magnet without the usual corresponding large increase in fringing, and a rad… more
Date: January 1, 1981
Creator: Thorn, C. E.; Chasman, C. & Baltz, A. J.
Partner: UNT Libraries Government Documents Department
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Spectrometer coupled to an electron storage ring for tagging laser backscattered gamma rays

Description: A spectrometer has been designed to momentum analyze electrons, from the 2.5 to 3.0 GeV x-ray storage ring of the National Synchrotron Light Source at Brookhaven National Laboratory, that have lost energy from the production of high energy ..gamma..-rays by Compton scattering of laser light. The electrons detected in the focal plane will provide a tag for the backscattered ..gamma..-rays, determining their energy (to 2.3 MeV), and timing. This design utilizes the fact that, due to kinematics, t… more
Date: January 1, 1982
Creator: Thorn, C. E.; LeVine, M. J. & Sandorfi, A. M.
Partner: UNT Libraries Government Documents Department
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Scattering of polarized photons at LEGS

Description: The Laser-Electron-Gamma-Source (LEGS) facility at Brookhaven National Laboratory is now coming into operation. This facility delivers intense, monochromatic beams of medium-energy gamma rays that are almost completely polarized (linear or circular), and this degree of freedom has altered the status of a number of important experiments from being impossible to now being merely difficult. In this lecture we will describe the key features of the LEGS facility, and discuss two elastic scattering e… more
Date: January 1, 1988
Creator: Sandorfi, A. M.; Blanpied, G.; Blecher, M.; Giordano, G.; Kistner, O. C.; Matone, G. et al.
Partner: UNT Libraries Government Documents Department
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Laser-Electron-Gamma-Source. Progress report, June 1984

Description: Construction of the Laser Electron Gamma Source (LEGS) began at Brookhaven in October 1983. When completed, the source will provide intense beams of monochromatic and polarized gamma rays with energies in the range of several hundreds of MeV. The planned layout of this facility with its experimental areas is shown. The gamma-ray beams will be produced by Compton backscattering uv laser light from the electrons circulating in the 2.5-3.0 GeV X-RAY storage ring of the National Synchrotron Light S… more
Date: January 1, 1984
Creator: Dowell, D. H.; Giordano, G.; LeVine, M. J.; Matone, G.; Sandorfi, A. M.; Schaerf, C. et al.
Partner: UNT Libraries Government Documents Department
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Photon scattering from the nucleon at LEGS (Laser Electron Gamma Source)

Description: The elastic scattering of linearly polarized photons is discussed as a means of measuring the E2/M1 mixing ratio in the excitation of the delta (1232) resonance. The crucial problem in extracting this quantity is the presence of interfering backgrounds. The difference of two scattering cross sections with different incident polarizations can be used to eliminate almost all of the background contributions. As a measure of the sensitivity of this method, such a cross section difference can exhibi… more
Date: January 1, 1988
Creator: Sandorfi, A. M.; Blanpied, G.; Blecher, M.; Giordano, G.; Kistner, O. C.; Matone, G. et al.
Partner: UNT Libraries Government Documents Department
open access

Brookhaven Medium-Energy Gamma-Ray Project

Description: Within the next year we hope to begin the construction of a facility that would provide intense beams of monochromatic and polarized photons with energies in the range of several hundreds of MeV. These ..gamma.. rays will be produced by Compton backscattering laser light from the electrons circulating in the 2.5 to 3.0 GeV X-RAY storage ring of the National Synchrotron Light Source (NSLS) at Brookhaven National Laboratory. Gamma rays up to 80 MeV in energy are produced by this mechanism at the … more
Date: January 1, 1982
Creator: Sandorfi, A. M.; LeVine, M. J.; Thorn, C. E.; Giordano, G. & Matone, G.
Partner: UNT Libraries Government Documents Department
open access

Spiral design and beam dynamics for a variable energy cyclotron

Description: Beam-orbit studies were performed for the conversion of the SREL synchrocyclotron magnet for use as a room temperature, multiparticle, isochronous cyclotron. Based on model magnet measurements of field profiles for 8 to 23/sup 0/K gauss hill fields, a four sector spiral pole tip design has been realized which allows all isotope species of heavy ion beams to be accelerated to required final energies. The total spiral angle of 38/sup 0/ allows injection of the beams from the MP tandem into the cy… more
Date: January 1, 1981
Creator: Baltz, A. J.; Chasman, C. & Thorn, C. E.
Partner: UNT Libraries Government Documents Department
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pi. /sup 0/ spectrometer for photopion production studies

Description: One of the first experimental programs to be carried out with the BNL Gamma Ray Beam will be a study of (..gamma..,..pi../sup 0/). We present here a discussion of existing ..pi../sup 0/ spectrometers and two new designs which, for the ..pi../sup 0/ energy range of interest for this program, are superior to existing designs.
Date: January 1, 1982
Creator: LeVine, M. J.; Sandorfi, A. M. & Thorn, C. E.
Partner: UNT Libraries Government Documents Department
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Charged-pion spectrometer for the BNL gamma-ray-beam facility

Description: The (..gamma..,..pi../sup +-/) studies planned for the BNL Gamma Ray Beam Facility necessitate the detection of charged pions in the energy range 25 < T/sub pi/ < 150 MeV with a modest resolving power to match the photon beam energy resolution (27 MeV). The solid angle must be as large as possible, and the total path length must be as short as possible to minimize the losses due to pion decay. (The mean lifetime corresponds to L = 4.87 m for T/sub pi/ = 25 MeV). Finally, a means must be provide… more
Date: January 1, 1982
Creator: LeVine, M. J.; Thorn, C. E. & Sandorfi, A. M.
Partner: UNT Libraries Government Documents Department
open access

A portable cryostat for the cold transfer of polarized solid HD targets: HDice-I

Description: A device has been developed with moveable liquid nitrogen and liquid helium volumes that is capable of reaching over two meters into the coldest regions of a cryostat or dilution refrigerator and reliably extracting or installing a target of solid, polarized hydrogen deuteride (HD). This Transfer Cryostat incorporates a cylindrical neodymium rare-earth magnet that is configured as a Halbach dipole, which is maintained at 77 K and produces a 0.1 T field around the HD target. Multiple layers prov… more
Date: February 1, 2014
Creator: Bass, Christopher D.; Sandorfi, Andy M.; Bade, C.; Blecher, M.; Caracappa, A.; D'Angelo, A. et al.
Partner: UNT Libraries Government Documents Department
open access

Production of high-power CW UV by resonant frequency quadrupling of a Nd:YLF laser

Description: The authors have constructed a single ring to resonantly double an 18 watt Nd:YLF mode-locked laser and re-double the stored green to produce over 4 watts of power in the ultra-violet (UV). This laser is used to produce a beam of 470 MeV gamma-rays by Compton backscattering the laser beam from 2.8 GeV electrons stored in a synchrotron. Achieving high luminosity of the colliding beams requires very good mode quality and beam stability at the intersection point 22 meters from the laser. The ring … more
Date: June 1999
Creator: Kuczewski, A. J.; Thorn, C. E.; Matone, G. & Giordano, G.
Partner: UNT Libraries Government Documents Department
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