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A Study of the Ion Hose Instability in the DARHT-II Downstream Transport Region

Description: The second axis of the DARHT flash X-ray facility at Los Alamos National Laboratory (''DARHT-II'') is a multiple-pulse, 18.4 MeV, 2 kA induction electron linear accelerator [1]. A train of short ({approx}50 ns) pulses are converted via bremsstrahlung to X-rays, which are then used to make radiographic images at various times (nominally four) during a ''hydrotest'' experiment. The train of pulses is created by carving them out of a two microsecond long macropulse, using a fast switching element … more
Date: November 11, 2004
Creator: McCarrick, J F
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

BEAM DUMP WINDOW DESIGN FOR THE SPALLATION NEUTRON SOURCE.

Description: The Spallation Neutron Source accelerator systems will provide a 1 GeV, 1.44 MW proton beam to a liquid mercury target for neutron production. Beam tuning dumps are provided at the end of the linac (the Linac Dump) and in the Ring-to-Target transport line (the Extraction Dump) [1]. Thin windows are required to separate the accelerator vacuum from the poor vacuum upstream of the beam dump. There are several challenging engineering issues that have been addressed in the window design. Namely, han… more
Date: March 10, 2004
Creator: RAPARIA,D. RANK,J. MURDOCH,G. ET AL.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Development of an abort gap monitor for the large hadroncollider

Description: The Large Hadron Collider (LHC), presently under construction at CERN, requires monitoring the parasitic charge in the 3.3ms long gap in the machine fill structure. This gap, referred to as the abort gap, corresponds to the raise time of the abort kickers magnets. Any circulating particle present in the abort gap at the time of the kickers firing is lost inside the ring, rather than in the beam dump, and can potentially damage a number of the LHC components. CERN specifications indicate a linea… more
Date: July 1, 2004
Creator: Beche, J.-F.; Byrd, J.; De Santis, S.; Placidi, M.; Turner, W. & Zolotorev, M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Development of an abort gap monitor for high-energy proton rings

Description: The fill pattern in proton synchrotrons usually features an empty gap, longer than the abort kicker raise time, for machine protection. This gap is referred to as the ''abort gap'' and any particles, which may accumulate in it due to injection errors and diffusion between RF buckets, would be lost inside the ring, rather than in the beam dump, during the kicker firing. In large proton rings, due to the high energies involved, it is vital to monitor the build up of charges in the abort gap with … more
Date: May 3, 2004
Creator: Beche, Jean-Francois; Byrd, John; De Santis, Stefano; Denes, Peter; Placidi, Massimo; Turner, William et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

OPERATION OF SECOND-GENERATION HCX DIAGNOSTICS FOR ELECTRON AND GAS EFFECTS IN MAGNETIC QUADRUPOLE MAGNETS

Description: We report the successful development and commissioning of new diagnostics for electron cloud and gas desorption studies on the High Current Experiment (HCX) at LBNL. These measure the time-dependent gas density in a 0.03 - 0.2 A 1 MeV K{sup +} ion beam inside of a quadrupole magnet, and the three possible sources of electrons: from ionization of gas, from beam tube walls, and from an end wall where the beam dumps. The accumulation of electrons in the beam is determined by measuring the net char… more
Date: June 23, 2004
Creator: Molvik, A W; Siedl, P A; Bieniosek, F M; Cohen, R H; Faltens, A; Friedman, A et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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