Search Results - "Macek, R.J."

Development of thick, long-lived carbon stripper foils for PSR of LANL by Sugai, I, Oyaizu, M, Kawakami, H, Ohmori, C, Hattori, T, Kawasaki, K, Borden, M.J, Macek, R.J

“…Thick carbon stripper foils (multi-layer thickness ≈ 200 μg/cm 2) have been developed for use with 800 MeV, H + ion beam in the Proton Storage Ring (PSR) at…”
Get full text

Comparison of carbon and corrugated diamond stripper foils under operational conditions at the Los Alamos PSR by Spickermann, T., Borden, M.J., Macek, R.J., Shaw, R.W., Feigerle, C.S., Sugai, I.

“…To accumulate high-intensity proton pulses, the Los Alamos Proton Storage Ring (PSR) uses the charge-exchange injection method. H − ions merge with already…”
Get full text

Diagnostic for Electron Clouds Trapped in Quadrupoles by Macek, R.J., Browman, A.A.

“…Simulations have indicated that electron clouds generated by beam-induced multipactor can be trapped in the mirror-like fields of magnetic quadrupoles and…”
Get full text

PSR electron cloud detector and suppressor mechanical design and fabrication by O'Hara, J.F., Macek, R.J., Browman, A.A., Borden, M.J., Ledford, J.E., Gillespie, N.A., Martinez, D., McKeown, K.G., Olivas, F.R.

“…In order to better understand the two stream e-p instability issue in the LANSCE Proton Storage Ring (PSR), a new diagnostic instrument has been developed to…”
Get full text

Electron cloud generation and trapping in a quadrupole magnet at the Los Alamos PSR by Macek, R.J., Browman, A.A., Ledford, J.E., Borden, M.J., O'Hara, J.F., McCrady, R.C., Rybarcyk, L.J., Spickermann, T., Zaugg, T.J., Pivi, M.T.F.

“…A diagnostic to measure electron cloud formation and trapping in a quadrupole magnet has been developed, installed, and successfully tested at PSR. Beam…”
Get full text

Stripper foil failure modes and cures at the Oak Rdige Spallation Neutron Source by Plum, M.A., Raparia, D., Cousineau, S.M., Galambos, J., Kim, S.H., Ladd, P., Luck, C.F., Peters, C.C., Polsky, Y., Shaw, R.W., Macek, R.J.

“…The Oak Ridge Spallation Neutron Source comprises a 1 GeV, 1.5 MW linear accelerator followed by an accumulator ring and a liquid mercury target. To manage the…”
Get full text

Fail-safe ion chamber beam loss monitor system for personnel protection by Brown, D, Plum, M.A, Browman, A.A, Macek, R.J

“…A fail-safe beam loss monitor system has been designed for use in the Los Alamos Neutron Scattering Center (LANSCE) Radiation Security System (RSS). The latest…”
Get full text

Transverse electron-proton two-stream instability in a bunched beam by Wang, T.-S.F., Channell, P.J., Macek, R.J., Davidson, R.C.

“…This paper is an analytical investigation of the transverse electron-proton (e-p) two-stream instability in a proton bunch propagating through a stationary…”
Get full text

Calculations and observations of the longitudinal instability caused by the ferrite inductors at the Los Alamos Proton Storage Ring (PSR) by Beltran, C., Browman, A.A., Macek, R.J.

“…The frequency dependence of the complex permeability of the ferrite (at room temperature and 125 /spl deg/C) used in the inductors at PSR has been determined…”
Get full text

Electron cloud diagnostics in use at the Los Alamos PSR by Macek, R.J., Browman, A., Borden, M., Fitzgerald, D., Wang, T.S., Zaugg, T., Harkay, K., Rosenberg, R.

“…A variety of electron cloud diagnostics have been deployed at the Los Alamos Proton Storage Ring (PSR) to detect, measure, and characterize the electron cloud…”
Get full text

Status of the experimental studies of the electron cloud at the Los Alamos proton storage ring by Macek, R.J., Browman, A., Borden, M., Fitzgerald, D., McCrady, R., Spickermann, T., Zaugg, T.

“…The electron cloud (EC) at the Los Alamos Proton Storage Ring (PSR) has been studied extensively for the past several years with an overall aim to identify and…”
Get full text

Overview of progress on the improvement projects for the LANSCE accelerator and target facilities by Macek, R.J., Browne, J.C., Brun, T., Donahue, J.B., Fitzgerald, D.H., Pynn, R., Schriber, S.O., Weinacht, D.

“…Three projects have been initiated since 1994 to improve the performance of the accelerator and target facilities for the Los Alamos Neutron Science Center…”
Get full text

Development of a RAMI program for LANSCE upgrade by Chan, K.C.D., Browman, A., Hutson, R.L., Macek, R.J., Tallerico, P.J., Wilkinson, C.A.

“…Improvement of beam availability is a prime objective of the present LANSCE (Los Alamos Neutron Scattering Center) Upgrade. A RAMI (reliability, availability,…”
Get full text

Electric-field-induced electron detachment of 800-MeV H- ions by Keating, PB, Gulley, MS, Bryant, HC, MacKerrow, EP, Miller, WA, Rislove, DC, Cohen, S, Donahue, JB, Fitzgerald, DH, Funk, DJ, Frankle, SC, Hutson, RL, Macek, RJ, Plum, MA, Stanciu, NG, van Dyck OB, Wilkinson, CA

Get full text

Commissioning of the Los Alamos PSR injection upgrade by Fitzgerald, D.H., Garnett, R., Jones, K., Macek, R.J., Merrill, F., Pillai, C., Plum, M.A., Sander, O.R., Browman, A., Johnson, D., Kustom, R.

“…An upgrade has been completed and commissioned to the Los Alamos Proton Storage Ring (PSR) to allow direct injection of the H/sup -/ beam into the ring and to…”
Get full text

Electron proton two-stream instability at the PSR by Macek, R.J., Browman, A., Fitzgerald, D., McCrady, R., Merrill, F., Plum, M., Spickermann, T., Wang, T.S., Griffin, J., Ng, K.Y., Wildman, D., Harkay, K., Kustom, R., Rosenberg, R.

“…A strong, fast, transverse instability has long been observed at the Los Alamos Proton Storage Ring (PSR) where it is a limiting factor on peak intensity. Most…”
Get full text

Recent experimental evidence for the Los Alamos Proton Storage Ring beam instability by Plum, M.A., Fitzgerald, D.H., Johnson, D., Langenbrunner, J., Macek, R.J., Merrill, F., Morton, P., Prichard, B., Sander, O., Shulze, M., Thiessen, H.A., Wang, T.S., Wilkinson, C.A.

“…The peak intensity of the PSR is limited by a fast transverse instability. In 1996 we started a project to upgrade the PSR to 200 /spl mu/A at 30 Hz, which…”
Get full text

Overview and status of the Los Alamos PSR injection upgrade project by Fitzgerald, D.H., Ahn, H., Blind, B., Borden, M.J., Macek, R.J., Neri, F., Plum, M.A., Rose, C.R., Thiessen, H.A., Wilkinson, C.A., Zumbro, M.V.

“…An upgrade is in progress to the Los Alamos Proton Storage Ring (PSR) to allow direct injection of the H/sup -/ beam into the ring and provide a beam bump…”
Get full text

LANSCE short-pulse spallation source target upgrade by Donahue, J.B., Baker, G.D., Bultman, N.K., Brun, T.O., Ferguson, P.D., Macek, R.J., Njegomir, M.M., Plum, M.A., Roberts, J.E., Russell, G.J., Sommer, W.F.

“…A project to upgrade the short-pulse spallation source target at the Los Alamos Neutron Scattering Center (LANSCE) is in progress. This upgrade will reduce the…”
Get full text

High Intensity Beam Profile Monitors for the LAMPF Primary Beam Lines by Hoffman, E. W., Macek, R. J., van Dyck, O., Lee, D., Harvey, A., Bridge, J., Caine, J.

“…Two types of beam profile monitors are in use at LAMPF to measure the properties of the 800 MeV, 500 #x003BC;A proton beam external to the linac. Both types…”
Get full text