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Microwave longitudinal coupling impedance in ISABELLE vacuum chamber

Description: The purpose of this paper is to investigate the modes above the cutoff frequency of the ISABELLE vacuum chamber, and to measure some typical values of the longitudinal coupling impedance. (The investigation was limited to only those modes that have fields in the beam pipe.) Measurements show that the impedance, Z, between 2.6 and 2.8 GHz, can be as high as 10 x n ohms, where n is the ratio of the excitation frequency of the beam divided by the fundamental rotational frequency of the ISABELLE ri… more
Date: March 1, 1980
Creator: Giordano, S. & Votruba, J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

NBS-LASL racetrack microtron

Description: The NBS-LASL racetrack microtron (RTM) is a joint project of the National Bureau of Standards (NBS) and the Los Alamos Scientific Laboratory (LASL). This is a new accelerator research project whose goal is to determine the feasibility of building a high-energy, high-current, cw electron accelerator using beam recirculation and room-temperature rf acceleration structures. The NBS-LASL RTM is being designed and built to develop the required technology for a large national 1 to 2 GeV cw accelerato… more
Date: January 1, 1980
Creator: Penner, S.; Debenham, P.H. & Green, D.C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Seismic isolation of an electron microscope

Description: A unique two-stage dynamic-isolation problem is presented by the conflicting design requirements for the foundations of an electron microscope in a seismic region. Under normal operational conditions the microscope must be isolated from ambient ground noise; this creates a system extremely vulnerable to seismic ground motions. Under earthquake loading the internal equipment forces must be limited to prevent damage or collapse. An analysis of the proposed design solution is presented. This study… more
Date: January 1, 1980
Creator: Godden, W.G.; Aslam, M. & Scalise, D.T.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Toward more accurate loss tangent measurements in reentrant cavities

Description: Karpova has described an absolute method for measurement of dielectric properties of a solid in a coaxial reentrant cavity. His cavity resonance equation yields very accurate results for dielectric constants. However, he presented only approximate expressions for the loss tangent. This report presents more exact expressions for that quantity and summarizes some experimental results.
Date: May 1, 1980
Creator: Moyer, R. D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Proton-proton colliding beam facility ISABELLE

Description: This paper attempts to present the status of the ISABELLE construction project, which has the objective of building a 400 + 400 GeV proton colliding beam facility. The major technical features of the superconducting accelerators with their projected performance are described. Progress made so far, difficulties encountered, and the program until completion in 1986 is briefly reviewed.
Date: January 1, 1980
Creator: Hahn, H
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Accelerator technology program. Progress report, January-December 1979

Description: The activities of Los Alamos Scientific Laboratory's (LASL) Accelerator Technology (AT) Division during the calendar year 1979 are highlighted, with references to more detailed reports. This report is organized around the major projects of the Division, reflecting a wide variety of applications and sponsors. The first section covers the Fusion Materials Irradiation Test program, a collaborative effort with the Hanford Engineering Development Laboratory; the second section summarizes progress on… more
Date: November 1, 1980
Creator: Knapp, E.A. & Jameson, R.A. (comps.)
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Argonne tandem as injector to a superconducting linac

Description: The Argonne Tandem uses Pelletron chains, NEC accelerator tubes, and a dual closed-corona system. Its main function is to be an injector for a superconducting linear accelerator. As long as the transverse and longitudinal emittances are within the acceptance of the linac, the output beam quality of the tandem-linac system is essentially determined by the tandem. The sensitivity of the linac to the longitudinal emittance ..delta..E..delta..t of the incident beam makes the output beam quality dep… more
Date: January 1, 1980
Creator: Yntema, J. L.; Den Hartog, P. K.; Henning, W. & Kutschera, W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Radio-frequency quadrupole linear accelerator

Description: The radio-frequency quadrupole (RFQ) is a new linear accelerator concept in which rf electric fields are used to focus, bunch, and accelerate the beam. Because the RFQ can provide strong focusing at low velocities, it can capture a high-current dc ion beam from a low-voltage source and accelerate it to an energy of 1 MeV/nucleon within a distance of a few meters. A recent experimental test at the Los Alamos Scientific Laboratory (LASL) has confirmed the expected performance of this structure an… more
Date: January 1, 1980
Creator: Wangler, T. P. & Stokes, R. H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Surface studies of materials for superconducting cavities

Description: A multitechnique system has been constructed to study materials and processes used for producing high Q superconducting cavities, while constantly maintaining uhv environment. Characterization of a small disc of superconducting material, e.g. Nb, is done by a variety of methods, including AES, XPS, EID, ellipsometry, sputter profiling, and secondary electron yield measurements. The samples may be processed in situ by rf and electron bombardment heating, and ion sputtering. Sample temperatures m… more
Date: June 1, 1980
Creator: Garwin, E. L.; Kirby, R. E.; Momose, T. & Hoyt, E. W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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