Zobrazeno 1 - 10
of 33
pro vyhledávání: '"C. K. Allen"'
Publikováno v:
Physical Review Special Topics. Accelerators and Beams, Vol 13, Iss 4, p 044401 (2010)
A weak transverse resonance in the Spallation Neutron Source (SNS) superconducting linac is identified in computer simulations, and is believed to be one of the mechanisms behind measured beam losses. This weak resonance is induced by the nonlinear d
Externí odkaz:
https://doaj.org/article/738a97d9cd7947878b360826dc68015d
Publikováno v:
Physical Review Special Topics. Accelerators and Beams, Vol 9, Iss 6, p 064202 (2006)
We present detailed calculations of RMS-envelope matching over a broad range of beam intensities for the University of Maryland Electron Ring (UMER). Containment of beams from zero current to extreme space charge, all without changing the strength of
Externí odkaz:
https://doaj.org/article/f6b1eafe2c34439e96e939babde316c2
Autor:
C. K. Allen, T. P. Wangler
Publikováno v:
Physical Review Special Topics. Accelerators and Beams, Vol 5, Iss 12, p 124202 (2002)
Two different parameters for the quantitative description of beam halo are discussed. Both are based on moments of the particle distribution and represent a convenient and model-independent method for quantifying the magnitude of beam halo observed i
Externí odkaz:
https://doaj.org/article/496da39eaf5d4ecb8dd532afe27b9558
Autor:
Donald C. Cook, Lucas N. Owen, Fred R. Musser, Angus L. Catchot, Ryan E. Jackson, Jeff Gore, C. K. Allen
Publikováno v:
Crop Protection. 54:206-212
Field experiments were conducted during 2009 and 2010 to evaluate the effects of defoliation on maturity group IV soybeans, Glycine max (L.) Merr., grown in Mississippi. During each year, two locations were planted with maturity group IV soybeans tha
Autor:
C. K. Allen, Martin Reiser
Publikováno v:
Physical Review E. 55:7591-7605
We derive a set of differential equations for the beam envelopes of an axisymmetric, bunched beam inside a perfectly conducting beam pipe. It is found that the beam dynamics are essentially independent of the form of bunch distribution in the free-sp
Autor:
C. K. Allen, Martin Reiser
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 384:322-332
The transport and matching problem for a low energy transport system is approached from a control theoretical viewpoint. We develop a model for a beam transport and matching section based on a multistage control network. To this model we apply the pr
Publikováno v:
Review of Scientific Instruments. 65:1774-1777
The characteristics of a 30 mA, 35 kV H− beam from a volume source have been determined using emittance measurements. A low energy‐beam transport (LEBT) system consisting of six electrostatic quadrupole lenses and a short (about 5 cm long) single
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 339:429-438
With an aim of transporting an initially diverging high-perveance (generalized beam perveance 2I b I 0 β 3 γ 3 = 0.003 ), high-brightness (normalized brightness ∼1011 A/(m rad)2) H− beam and finally focusing it without any significant emittance
Autor:
B. Quinn, Patrick G. O'Shea, R. A. Kishek, Martin Reiser, Santiago Bernal, C. K. Allen, H. Li, M. Walter
Publikováno v:
Physical Review Special Topics. Accelerators and Beams, Vol 9, Iss 6, p 064202 (2006)
We present detailed calculations of RMS-envelope matching over a broad range of beam intensities for the University of Maryland Electron Ring (UMER). Containment of beams from zero current to extreme space charge, all without changing the strength of
Publikováno v:
Proceedings of International Conference on Particle Accelerators.
A low-energy beam transport system is designed with the aim of transporting 30 mA, 35 kV H/sup -/ beam from a volume source and focusing it into an RFQ. The characteristics of the beam from the source are determined analyzing the emittance data. The