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Experimental test accelerator: description and results of initial experiments

Description: The ETA is a high current (10,000 Amp) linear induction accelerator that produces short (30 ns) pulses of electrons at 5 MeV twice per second or in bursts of 5 pulses separated by as little as one millisecond. At this time the machine has operated at 65% of its design current and 90% of the design voltage. This report contains a description of the accelerator and its diagnostics; the results of the initial year of operation; a comparison of design codes with experiments on beam transport; and a… more
Date: June 2, 1980
Creator: Fessenden, T.; Birx, D. & Briggs, R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

CLIC RF High Power Production Testing Program

Description: The CLIC Power Extraction and Transfer Structure (PETS) is a passive microwave device in which bunches of the drive beam interact with the impedance of the periodically loaded waveguide and generate RF power for the main linac accelerating structure. The demands on the high power production ({approx} 150 MW) and the needs to transport the 100 A drive beam for about 1 km without losses, makes the PETS design rather unique and the operation very challenging. In the coming year, an intense PETS te… more
Date: November 2, 2011
Creator: Syratchev, I.; Riddone, G. & Tantawi, S. G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Beam-energy and laser beam-profile monitor at the BNL LINAC

Description: We are developing a non-interceptive beam profile and energy monitor for H{sup -} beams in the high energy beam transport (HEBT) line at the Brookhaven National Lab linac. Electrons that are removed from the beam ions either by laser photodetachment or stripping by background gas are deflected into a Faraday cup. The beam profile is measured by stepping a narrow laser beam across the ion beam and measuring the electron charge vs. transverse laser position. There is a grid in front of the collec… more
Date: May 2, 2010
Creator: Connolly, R.; Briscoe, B.; Degen, C.; DeSanto, L.; Meng, W.; Minty, M. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Improved alternating gradient transport and focusing of neutral molecules

Description: Polar molecules, in strong-field seeking states, can be transported and focused by an alternating sequence of electric field gradients that focus in one transverse direction while defocusing in the other. We show by calculation and numerical simulation, how one may greatly improve the alternating gradient transport and focusing of molecules. We use a new optimized multipole lens design, a FODO lattice beam transport line, and lenses to match the beam transport line to the beam source and the fi… more
Date: December 2, 2001
Creator: Kalnins, Juris; Lambertson, Glen & Gould, Harvey
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Beam Tools for Geant4 (User's Guide)

Description: Geant4 is a tool kit developed by a collaboration of physicists and computer professionals in the high energy physics field for simulation of the passage of particles through matter. The motivation for the development of the Beam Tools is to extend the Geant4 applications to accelerator physics. The Beam Tools are a set of C++ classes designed to facilitate the simulation of accelerator elements: r.f. cavities, magnets, absorbers, etc. These elements are constructed from Geant4 solid volumes li… more
Date: December 2, 2002
Creator: V.Daniel Elvira, Paul Lebrun and Panagiotis Spentzouris
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Laser Safety Evaluation of the MILES and Mini MILES Laser Emitting Components

Description: Laser safety evaluation and output emission measurements were performed (during October and November 2001) on SNL MILES and Mini MILES laser emitting components. The purpose, to verify that these components, not only meet the Class 1 (eye safe) laser hazard criteria of the CDRH Compliance Guide for Laser Products and 21 CFR 1040 Laser Product Performance Standard; but also meet the more stringent ANSI Std. z136.1-2000 Safe Use of Lasers conditions for Class 1 lasers that govern SNL laser operat… more
Date: February 2, 2002
Creator: AUGUSTONI, ARNOLD L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Review of window and filter requirements for commissioning of the Advanced Photon Source insertion device beamlines

Description: The Advanced Photon Source (APS) is building 16 insertion device (ID) front ends for the first phase of the project. Eleven of these are to be equipped with the APS Undulator A and the other five with a Wiggler-A-type source. The Undulator A front ends are designed to operate in a ``windowless`` mode using an APS-designed differential pump. However, during beamline commissioning and early operations of the storage ring, it is prudent to install windows to ensure storage ring vacuum safety befor… more
Date: June 2, 1994
Creator: Kuzay, T. M. & Wang, Zhibi
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Lattice Design for ERL Options at SLAC

Description: SLAC is investigating long-range options for building a high performance light source machine while reusing the existing linac and PEP-II tunnels. One previously studied option is the PEP-X low emittance storage ring. The alternative option is based on a superconducting Energy Recovery Linac (ERL) and the PEP-X design. The ERL advantages are the low beam emittance, short bunch length and small energy spread leading to better qualities of the X-ray beams. Two ERL configurations differed by the l… more
Date: June 2, 2011
Creator: Nosochkov, Yuri; Cai, Yunhai; Huang, Xiaobiao & Wang, Min-Huey
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Iris tilting and RF steering in the SLAC Linac

Description: For some time now, the sources of RF transverse beam steering in the SLAC Linac have been a mystery. The previously known sources, coupler asymmetries and survey misalignment, have predicted deflections which are frequently much smaller than the observed deflections. A new source of RF steering has been discovered: the tilting of accelerator irises. Measurements of iris tilting in a forty foot accelerator girder are compared with measurements of RF beam deflections and are found to be strongly … more
Date: May 2, 1985
Creator: Seeman, J. T.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

On the relaxation of semi-Gaussian and K-V beams to thermal equilibrium

Description: A beam propagating in a continuous, linear focusing channel tends to relax to a thermal equilibrium state. We employ nonlinear conservation constraints to theoretically analyze changes in quantities that characterize both an initial semi-Gaussian beam with a matched rms beam envelope and a K-V beam under a relaxation to thermal equilibrium. Results from particle-in-cell simulations are compared to the theoretical predictions.
Date: May 2, 1995
Creator: Lund, S.M.; Barnard, J.J. & Miller, J.M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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