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22 results on '"Ghiorso, W."'

1. Demonstration of a compact linear accelerator

Author

Seidl, P. A., Persaud, A., Ghiorso, W., Ji, Q., Waldron, W. L., Lal, A., Vinayakumar, K. B., and Schenkel, T.

Subjects
Accelerator Physics (physics.acc-ph), FOS: Physical sciences, Physics::Accelerator Physics, Physics - Accelerator Physics
Abstract

Recently, we presented a new approach for a compact radio-frequency (RF) accelerator structure and demonstrated the functionality of the individual components: acceleration units and focusing elements. In this paper, we combine these units to form a working accelerator structure including a matching section between the ion source extraction grids and the RF-acceleration unit. The matching section consist of six electrostatic quadrupoles (ESQs) fabricated using 3D-printing techniques. The matching section enables us to capture twice the amount of beam and match the beam envelope to conditions for an acceleration lattice. We present data from an integrated accelerator consisting of the source, matching section, and an ESQ doublet sandwiched between two RF-acceleration units., 5 pages, 7 figures, submitted to RSI (2018)

Published
2018

3. Source-to-accelerator quadrupole matching section for a compact linear accelerator.

Author

Seidl, P. A., Persaud, A., Ghiorso, W., Ji, Q., Waldron, W. L., Lal, A., Vinayakumar, K. B., and Schenkel, T.

Subjects
QUADRUPOLES, LINEAR accelerators, PARTICLE accelerators, RADIO frequency, ELECTROSTATIC accelerators, THREE-dimensional printing, ELECTRON beam induced current, MATCHING theory
Abstract

Recently, we presented a new approach for a compact radio-frequency (RF) accelerator structure and demonstrated the functionality of the individual components: acceleration units and focusing elements. In this paper, we combine these units to form a working accelerator structure: a matching section between the ion source extraction grids and the RF-acceleration unit and electrostatic focusing quadrupoles between successive acceleration units. The matching section consists of six electrostatic quadrupoles (ESQs) fabricated using 3D-printing techniques. The matching section enables us to capture more beam current and to match the beam envelope to conditions for stable transport in an acceleration lattice. We present data from an integrated accelerator consisting of the source, matching section, and an ESQ doublet sandwiched between two RF-acceleration units. [ABSTRACT FROM AUTHOR]

Published
2018
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4. Rad-hard Luminosity Monitoring for the LHC

Author

Beche, J. F., Byrd, J. M., Chow, K., Denes, P., Ghiorso, W., Howard Matis, Monroy, M., Ratti, A., Santis, S., Turner, W. C., Bravin, E., Manfredi, P. F., and Vandelli, W.

Subjects
LHC Instrumentation Luminosity, Physics
Published
2008

5. Design and construction of the 3.2 MeV cathode assembly for DARHT II

Author

Peters, C., Yu, S., Eylon, S., Ghiorso, W., and Henestroza, E.

Subjects
High Energy Physics - Experiment (hep-ex), Physics, DARHT Cathode Design, FOS: Physical sciences, High Energy Physics - Experiment
Abstract

A 3.2 MeV injector has been designed and built for the Darht II Project at Los Alamos Lab. The installation of the complete injector system is nearing completion at this time. The requirements for the injector are to produce a 3.2 MeV, 2000 ampere electron pulse with a flattop width of at least 2-microseconds and emittance of less than 0.15 p cm-rad normalized. A 16.5 cm diameter hot emitter cathode is used. This paper will describe the design and fabrication of major Cathode Assembly components and test performance of subsystems to date. Mechanical and thermal issues will be emphasized. More detailed discussion of the active alignment system used to maintain the stringent cathode alignment requirement., 3 pages, 4 figures, LINAC2000

Published
2000

6. Mechanical design and fabrication of the VHF-gun, the Berkeley normal-conducting continuous-wave high-brightness electron source.

Author

Wells, R. P., Ghiorso, W., Staples, J., Huang, T. M., Sannibale, F., and Kramasz, T. D.

Subjects
*ELECTRON sources, *FREE electron lasers, *RADIO frequency, *CATHODES, *QUANTUM efficiency
Abstract

A high repetition rate, MHz-class, high-brightness electron source is a key element in future highrepetition- rate x-ray free electron laser-based light sources. The VHF-gun, a novel low frequency radio-frequency gun, is the Lawrence Berkeley National Laboratory (LBNL) response to that need. The gun design is based on a normal conducting, single cell cavity resonating at 186 MHz in the VHF band and capable of continuous wave operation while still delivering the high accelerating fields at the cathode required for the high brightness performance. The VHF-gun was fabricated and successfully commissioned in the framework of the Advanced Photo-injector EXperiment, an injector built at LBNL to demonstrate the capability of the gun to deliver the required beam quality. The basis for the selection of the VHF-gun technology, novel design features, and fabrication techniques are described. [ABSTRACT FROM AUTHOR]

Published
2016
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7. Heavy-ion fusion driver research at Berkeley and Livermore

Author

Seidl, P, Bangerter, R O, Celata, C M, Chupp, W W, De la Rama, F, Eylon, S, Faltens, A, Fessenden, T J, Fawley, W M, Ghiorso, W, Hahn, K D, Henestroza, E, Hipple, R, Judd, D, MacLaren, S, Peters, C, Reginato, L, Vanecek, D L, Stoker, J D, Yu, S, Barnard, J J, Cable, M D, Callahan, D A, Cianciolo, V, Deadrick, F J, Debeling, A, Friedman, A, Grote, D P, Holm, K A, Hopkins, H A, Karpenko, V P, Kirbie, H C, Longinotti, D B, Lund, S M, Nattrass, L A, Nelson, M B, Newton, M A, Sangster, T C, and Sharp, W M

Subjects
Accelerators and Storage Rings
Published
1996

9. Transverse combining of 4 beams in MBE-4

Author

Celata, C M, Chupp, W W, Faltens, A, Fawley, W M, Ghiorso, W, Hahn, K D, Henestroza, E, Peters, C, and Seidl, P

Subjects
Accelerators and Storage Rings
Published
1995

10. Evidence for the Synthesis of Element 110 Produced by the 59Co+209Bi Reaction

Author

Ghiorso, A., Lee, D., Somerville, P., Loveland, W., Nitschke, M., Ghiorso, W., Seaborg, G.T., Wilmarth, P.A., Leres, R., Wydler, A., Nurmia, M.J., Gregorich, K., Gaylord, R., Hamilton, T., Hannink, N.J., Hoffman, D.C., Jarzynski, C., Kacher, C., Kadkhodayan, B., Kreek, S., Lane, M., Lyon, A., McMahan, M.A., Neu, M., Sikkeland, T., Swiatecki, W.J., Turler, A., Walton, J.T., and Yashita, S.

Published
1994

11. Evidence for the synthesis of element $^{267}$110 produced by the $^{59}$Co + $^{209}$Bi reaction

Author

Ghiorso, A, Lee, D, Somerville, L P, Loveland, W, Nitschke, J M, Ghiorso, W, Seaborg, G T, Wilmarth, P A, Leres, R, Wydler, A, Nurmia, M J, Gregorich, K E, Gaylord, R, Hamilton, T, Hannink, N J, Hoffman, D C, Jarzynski, C, Kacher, C D, Kadkhodayan, B, Kreek, S A, Lane, M, Lyon, A L, McMahan, M A, Neu, M P, Sikkeland, T, Swiatecki, W J, Türler, A, Walton, J T, and Yashita, S

Subjects
Nuclear Physics
Published
1994

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