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Cavity shape and beam dynamics design for a linac for pions
Conference Record of the 1991 IEEE Particle Accelerator Conference
Year: 1991 | Conference Paper |
A linac to accelerate pions from 400 to 920 MeV kinetic energy is being designed as an upgrade to the LAMPF accelerator facility at Los Alamos, New Mexico. Calculations for the design of the superconducting cavity shape attempt to reduce the peak surface field needed to achieve a given accelerating gradient, yet ensure sufficient cell-to-cell coupling to maintain field stability when microphonics ...Show More
Transverse collective instability in the PSR
E.P. Colton;D. Neuffer;G. Swain;H.A. Thiessen;A. Lombardi;T. Wang
Proceedings of the 1989 IEEE Particle Accelerator Conference, . 'Accelerator Science and Technology
Year: 1989 | Conference Paper |
An instability in the Proton Storage Ring (PSR) is observed as fast loss of beam during accumulation and storage when the injected beam current exceeds a threshold value. Instabilities are observed during both coasting-beam and bunched-beam operation. Large coherent transverse oscillations occur prior to and during the beam loss. The growth times are rapid, typically in the range 10-100 mu s. The ...
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Show MoreGenerating catalogs of transverse matching solutions
Proceedings of the 1989 IEEE Particle Accelerator Conference, . 'Accelerator Science and Technology
Year: 1989 | Conference Paper |
Cited by: Papers (2)
An algorithm is described which rapidly finds a catalog of approximate transverse beam matching solutions. For a given initial beam, the algorithm finds the gradients of four quadrupole magnets so as to get four Twiss parameters (alpha and beta for horizontal and vertical planes) which are close to a set of desired values at the exit of a constant-energy beam line with no horizontal-vertical cross...
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Show MoreProgress on a prototype main ring RF cavity
G.R. Swain;R. Kandarian;H.A. Thiessen;R.L. Poirier;W.R. Smythe
Proceedings of the 1989 IEEE Particle Accelerator Conference, . 'Accelerator Science and Technology
Year: 1989 | Conference Paper |
Cited by: Papers (2)
A prototype RF cavity and RF drive system for a hadron facility main ring has been designed and is tested in the Proton Storage Ring (PSR) at Los Alamos National Laboratory (LANL) as part of a collaborative effort between LANL and TRIUMF. The cavity uses an orthogonally biased ferrite tuner. The design provides for accelerating gap voltages up to 200 kV for the 49.3-50.8-MHz range. Progress on the...
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Show MoreBeam position monitor upgrade for the Los Alamos Proton Storage Ring
R.E. Shafer;G. Swain;H.A. Thiessen;R. Macek;G. Mackenzie;W. Rawnsley
Proceedings of the 1989 IEEE Particle Accelerator Conference, . 'Accelerator Science and Technology
Year: 1989 | Conference Paper |
Cited by: Papers (1)
The beam diagnostics for the Los Alamos Proton Storage Ring (PSR) are being upgraded in several areas, including the closed-orbit beam-position system, the high-frequency longitudinal and transverse beam diagnostics, and the extraction-line beam-position monitoring system. The closed-orbit beam-position measuring system is based on detecting the 201 MHz modulation on the injected beam, which disap...
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Show MoreIncreasing the Relevance of Data Presented to the Operators in an Accelerator Control System
Relevancy assumes a critical importance in control system operation because of the large amount of information available. The information deluge impacts the following areas: If information is presented at too high a rate or in too large blocks, the operators may not comprehend it. If useless data is often presented in a given display, the operators may ignore all data presented by that display. If...Show More
Tuning and Pre-Beam Checkout of 805 MHz Side-Coupled Proton Linac Structures
G. R. Swain;R. A. Jameson;E. A. Knapp;D. J. Liska;J. M. Potter;J. D. Wallace
First Page of the Article
Show MoreCalculation of the Transient Response of Long Chains of Slightly Lossy Coupled Resonators
Methods of calculating and of illustrating the transient response of chains of coupled resonators are discussed. Such calculations are particularly useful in understanding the rf field behavior in linear accelerator structures, both of the drift tube and waveguide or coupled cavity types. Resonator chains are also employed in certain kinds of filters and delay lines; the methods to be discussed ar...Show More
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