skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Experimental results on a multi-charge-state LEBT approach.

Abstract

No abstract prepared.

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
939559
Report Number(s):
ANL/PHY/CP-59611
TRN: US0806775
DOE Contract Number:
DE-AC02-06CH11357
Resource Type:
Conference
Resource Relation:
Conference: Particle Accelerator Conference (PAC07); Jun. 25, 2007 - Jun. 29, 2007; Albuquerque, NM
Country of Publication:
United States
Language:
ENGLISH
Subject:
43 PARTICLE ACCELERATORS; LINEAR ACCELERATORS; ANL; BEAM INJECTION; BEAM TRANSPORT; HEAVY IONS; ECR ION SOURCES; PERFORMANCE

Citation Formats

Kondrashev, S. A., Barcikowski, A., Mustapha, B., Ostroumov, P. N., Scott, R. H., Sharamentov, S. I., and Vinogradov, N. Experimental results on a multi-charge-state LEBT approach.. United States: N. p., 2007. Web.
Kondrashev, S. A., Barcikowski, A., Mustapha, B., Ostroumov, P. N., Scott, R. H., Sharamentov, S. I., & Vinogradov, N. Experimental results on a multi-charge-state LEBT approach.. United States.
Kondrashev, S. A., Barcikowski, A., Mustapha, B., Ostroumov, P. N., Scott, R. H., Sharamentov, S. I., and Vinogradov, N. Mon . "Experimental results on a multi-charge-state LEBT approach.". United States. doi:.
@article{osti_939559,
title = {Experimental results on a multi-charge-state LEBT approach.},
author = {Kondrashev, S. A. and Barcikowski, A. and Mustapha, B. and Ostroumov, P. N. and Scott, R. H. and Sharamentov, S. I. and Vinogradov, N.},
abstractNote = {No abstract prepared.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}

Conference:
Other availability
Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that hold this conference proceeding.

Save / Share:
  • The ion source and Low-Energy Transport (LEBT) system that will provide H{sup -} ion beams to the Spallation Neutron Source (SNS)** Front End and the accelerator chain have been developed into a mature unit that fully satisfies the operational requirements through the commissioning and early operating phases of SNS. Compared to the early R&D version, many features of the ion source have been improved, and reliable operation at 6% duty factor has been achieved producing beam currents in the 35-mA range and above. LEBT operation proved that the purely electrostatic focusing principle is well suited to inject the ion beammore » into the RFQ accelerator, including the steering and pre-chopping functions. This paper will discuss the latest design features of the ion source and LEBT, give performance data for the integrated system, and report on commissioning results obtained with the SNS RFQ and Medium-Energy Beam Transport (MEBT) system. Prospects for further improvements will be outlined in concluding remarks.« less
  • The low energy (35 keV) and medium energy (750 keV) transport lines for both polarized and unpolarized H{sup -} have been reconfigured to reduce the beam emittance and beam losses out of the 200 MeV Linac. The medium energy line in the original layout was 7 m long, and had ten quadrupoles, two beam choppers, and three bunchers. The bunchers were necessary to keep the beam bunched at the entrance of the Linac. About 35% beam loss occurred, and the emittance growth was several fold. In the new layout, the 750 keV line is only 0.7 m long, with threemore » quads and one buncher. We will present the experimental result of the upgrade.« less
  • In order to design semiconductor devices so that they are resistant to single event upsets, a designer needs to know how much charge would be collected at various junctions in the semiconductor structure. For over a decade researchers have studied the physics of charge collection in semiconductor structures, focusing primarily on the charge collected between the p and n regions of a pn junction by drift and diffusion effects -- a process called funneling. However, when an energetic ion penetrates more than one pn junction, funneling is not the only charge collection mechanism. Simulations and experiments on multi-junction structures havemore » shown dramatic change in the charge collected when an ion penetrates two pn junctions. This charge transport between two regions of like conductivity that are ''bridged'' together by the ion track is called the ion shunt effect -- an effect investigated and experimentally proven by Hauser, et al. and Knudson, et al. This paper will present the algorithms and results of a computer program used to determine the charge collected on silicon semiconductor transistors due to the ion shunt effect. The program is unique because it is quick and simple to use and because it uses a general algorithm to determine an accurate initial electron-hole pair distribution in the ion track.« less
  • Space charge in high intensity beams is an important issue in accelerator physics. Due to the complicity of the problems, the most effective way of investigating its effect is by computer simulations. In the resent years, many space charge simulation methods have been developed and incorporated in various 2D or 3D multi-particle-tracking codes. It has becoming necessary to benchmark these methods against each other, and against experimental results. As a part of global effort, we present our initial comparison of the space charge methods incorporated in simulation codes ORBIT++, ORBIT and SIMPSONS. In this paper, the methods included in thesemore » codes are overviewed. The simulation results are presented and compared. Finally, from this study, the advantages and disadvantages of each method are discussed.« less
  • The radial charge-state distribution and transport of iron impurity ions in ohmically heated TFTR plasmas has been determined by a detailed comparison of the x-ray spectra obtained from a high resolution multi-chord crystal spectrometer with the predictions from plasma modeling calculations. 9 refs., 3 figs., 1 tab.