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Frontiers of particle beam physics

Description: First, a review is given of various highly-developed techniques for particle handling which are, nevertheless, being vigorously advanced at the present time. These include soft superconductor radio frequency cavities, hard superconductor magnets, cooling rings for ions and anti-protons, and damping rings for electrons. Second, attention is focused upon novel devices for particle generation, acceleration, and focusing. These include relativistic klystrons and free electron laser power sources, b… more
Date: November 1, 1989
Creator: Sessler, Andrew M.
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Partner: UNT Libraries Government Documents Department
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Resonator modes in high gain free electron lasers

Description: When the gain in a free electron laser is high enough to produce optical guiding, the resonator mode distorts and loses its forward-backward symmetry. We show that the resonator mode in a high gain FEL can be easily constructed using the mode expansion technique taken separately in the interaction and the free-space regions. We propose design strategies to achieve maximal gain and optimal mode quality, and discuss the stability of the optimized mode. 11 refs., 4 figs.
Date: October 1, 1989
Creator: Xie, Ming (Lawrence Berkeley Lab., CA (USA)); Deacon, D.A.G. (Deacon Research, Palo Alto, CA (USA)) & Madey, J.M.J. (Duke Univ., Durham, NC (USA). Dept. of Physics)
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Partner: UNT Libraries Government Documents Department
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Advanced Light Source Linac subharmonic buncher cavities

Description: The Linear Accelerator (Linac) in the Advanced Light Source (ALS) is designed to provide either single or multiple bunches of 50 MeV electrons for the booster synchrotron. Three bunchers are used in the Linac. The 3 GHz S band buncher has been described elsewhere. This report deals with the two lower subharmonic bunchers. One operates at 124.914 MHz while the other operates at 499.654 MHz. 12 refs., 2 figs.
Date: March 1, 1989
Creator: Lo, C.C.; Taylor, B.; Lancaster, H. & Guigli, J.
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Partner: UNT Libraries Government Documents Department
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Operational experience of the ATLAS accelerator

Description: The ATLAS accelerator consists of a HVEC model FN tandem accelerator injecting into a linac of independently-phased niobium superconducting resonators. The accelerator provides beams with masses from 6{le}A{le}127 and with energies ranging up to 20 MeV/A for the lightest ions and 4 MeV/A for the heaviest ions. Portions of the linac have been in operation since 1978 and, over the last decade, more than 35,000 hours of operating experience have been accumulated. The long-term stability of niobium… more
Date: January 1, 1989
Creator: Den Hartog, P. K.; Bogaty, J. M.; Bollinger, L. M.; Clifft, B. E.; Craig, S. L.; Harden, R. E. et al.
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Partner: UNT Libraries Government Documents Department
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New results on (LAMPF II) superconducting linac cost

Description: A consolidated cost estimate for a superconducting 800 MeV extension of the LAMPF I linac is presented in this note. Based on recent CERN-LEP tender results for 20 superconducting cavities, the cost of a superconducting linac structure (402.5 MHz) can be projected with much better accuracy than so far. The total construction cost for an 800 MeV extension amounts to 99.5 M$, buildings, cryoplant etc. included. The corresponding figure for a normal conducting structure (1207.5 MHz, on axis couple… more
Date: January 1, 1989
Creator: Schaffer, G.
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Partner: UNT Libraries Government Documents Department
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Status report on the radio frequency accelerating system of the APS (Advanced Photon Source) at Argonne

Description: Argonne National Laboratory is designing a 7-GeV Advanced Photon Source (APS). The rf systems of the APS include 10-MHz and 120-MHz systems for the Positron Accumulator Ring (PAR), a multicell 352-MHz system for the booster synchrotron, and a system of mode-damped, single-cell 352-MHz cavities for the storage ring. The paper will describe the design of the PAR cavities, the configuration of the booster system, test results of the junction circulator developed for the cavities, and results of th… more
Date: January 1, 1989
Creator: Nicholls, G.; Bridges, J.; Cook, J. & Kustom, R.
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Partner: UNT Libraries Government Documents Department
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Status of RF superconductivity at Argonne

Description: Development of a superconducting (SC) slow-wave structures began at Argonne National Laboratory (ANL) in 1971, and led to the first SC heavy-ion linac (ATLAS - the Argonne Tandem-Linac Accelerating System), which began regularly scheduled operation in 1978. To date, more than 40,000 hours of bean-on target operating time has been accumulated with ATLAS. The Physics Division at ANL has continued to develop SC RF technology for accelerating heavy-ions, with the result that the SC linac has, up to… more
Date: January 1, 1989
Creator: Shepard, K.W.
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Partner: UNT Libraries Government Documents Department
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High-frequency cavity applications and measurements of high-temperature superconductors

Description: A potentially important application of high-temperature superconductors will be high-frequency accelerating cavities. Currently these materials are not competitive with Nb at liquid helium temperature or with Cu at room temperature. However, available data on high-quality single crystals suggest that the relatively poor rf properties (high surface resistance and low surface magnetic field) of bulk and film specimens are due to materials properties that can be eliminated by improved processing t… more
Date: January 1, 1989
Creator: Cooke, D.W. & Gray, E.R.
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Partner: UNT Libraries Government Documents Department
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Beam loading and cavity compensation for the ground test accelerator

Description: The Ground Test Accelerator (GTA) will be a heavily beam-loaded H/sup minus/ linac with tight tolerances on accelerating field parameters. The methods used in modeling the effects of beam loading in this machine are described. The response of the cavity to both beam and radio-frequency (RF) drive stimulus is derived, including the effects of cavity detuning. This derivation is not restricted to a small-signal approximation. An analytical method for synthesizing a predistortion network that deco… more
Date: January 1, 1989
Creator: Jachim, S.P. & Natter, E.F.
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Partner: UNT Libraries Government Documents Department
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An improved phase-control system for superconducting low-velocity accelerating structures

Description: Microphonic fluctuations in the rf eigenfrequency of superconducting (SC) slow-wave structures must be compensated by a fast-tuning system in order to control the rf phase. The tuning system must handle a reactive power proportional to the product of the tuning range and the rf energy content of the resonant cavity. The accelerating field level of many of the SC cavities forming the ATLAS linac has been limited by the rf power capacity of the presently used PIN-diode based fast-tuner. A new sys… more
Date: January 1, 1989
Creator: Bogaty, J. M.; Clifft, B. E.; Shepard, K. W. & Zinkann, G. P.
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Partner: UNT Libraries Government Documents Department
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Rf superconductivity research and development at Los Alamos National Laboratory

Description: Los Alamos National Laboratory is engaged in two distinct areas of rf superconductivity research and development. One program is devoted to studying the rf properties of high-temperature superconductors (HTS) and assessing their potential for accelerator-cavity applications. Our best results to date have come from YBa{sub 2}Cu{sub 3}O{sub 7} films (0.8 {mu}m) electron-beam deposited onto LaGaO{sub 3} substrates. A typical surface resistance value is 0.2 {plus minus} 0.1 m{Omega} measured at 22 … more
Date: January 1, 1989
Creator: Cooke, D. W.; Gray, E. R.; Houlton, R. J.; Lawrence, G. P.; McGill, J. A.; Meyer, E. et al.
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Partner: UNT Libraries Government Documents Department
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Summary of Linac Group discussions

Description: This paper discusses upgrading of the LAMPF I linac. Particular topics discussed are: sources of and cures for linac beam halos, ion source, RFQ, chopper and drift-tube linac, cavity-coupled linac, superconducting linac structure, new rf power sources, EHF linac design, and cost projections. (LSP)
Date: January 1, 1989
Creator: Schaffer, G.
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Partner: UNT Libraries Government Documents Department
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Mechanical design of SXLS (Superconducting X-ray Lithography Source) radio-frequency cavity

Description: This paper presents the mechanical design of a Radio-Frequency (RF) cavity to be used on a compact storage ring for Superconducting X-ray Lithography Source (SXLS). Various design features of this cavity are discussed, including basic geometrical configuration, structural design, initial and operational tuning, vacuum multipactoring, power window, and damping of higher order modes. A second application of this cavity design for beam life extension in an existing storage ring is also described. … more
Date: January 1, 1989
Creator: Mortazavi, P.; Sharma, S.; Keane, J. & Thomas, M.
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Partner: UNT Libraries Government Documents Department
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Cost projection for a superconducting linac structure

Description: The increase of energy of the present 800 MeV proton linac at LAMPF to 1.6 to 2.2 GeV is of primary importance for the proposed future experimental program of this Laboratory. Layout and cost studies have been performed for (a) normalconducting and (b) superconducting accelerating structures. A more recent cost analysis for a superconducting structure is given in this report. 4 figs., 2 tabs.
Date: January 1, 1989
Creator: Schaffer, G.
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Partner: UNT Libraries Government Documents Department
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Superconducting low-velocity linac for the Argonne positive-ion injector

Description: A low-velocity superconducting linac has been developed as part of a positive-ion injector system, which is replacing a 9 MV tandem as the injector for the ATLAS accelerator. The linac consists of an independently phased array of resonators, and is designed to accelerate various ions over a velocity range .008 < v/c < .06. The resonator array is formed of four different types of superconducting interdigital structures. The linac is being constructed in three phases, each of which will cover the… more
Date: January 1, 1989
Creator: Shepard, K.W.; Markovich, P.K.; Zinkann, G.P.; Clifft, B. & Benaroya, R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Free electron lasers using stable-unstable ring resonators

Description: The free electron laser (FEL) simulation code FELEX is used to examine the operation of stable-unstable FEL resonators. These resonators are stable along one transverse axis and unstable along the orthogonal transverse axis. The simulations utilize a ring resonator with an intracavity focus in the unstable plane near the center of the wiggler (close to the same axial position as the waist in the stable plane) thereby enhancing the coupling between the optical and electron beams. Asymmetric outp… more
Date: January 1, 1989
Creator: Schmitt, Mark J. & Paxton, Alan H.
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Partner: UNT Libraries Government Documents Department
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