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Title: Design and implementation of a Thomson parabola for fluence dependent energy-loss measurements at the Neutralized Drift Compression eXperiment

Abstract

The interaction of ion beams with matter includes the investigation of the basic principles of ion stopping in heated materials. An unsolved question is the effect of different, especially higher, ion beam fluences on ion stopping in solid targets. This is relevant in applications such as in fusion sciences. To address this question, a Thomson parabola was built for the Neutralized Drift Compression eXperiment (NDCX-II) for ion energy-loss measurements at different ion beam fluences. The linear induction accelerator NDCX-II delivers 2 ns short, intense ion pulses, up to several tens of nC/pulse, or 1010-1011 ions, with a peak kinetic energy of ~1.1 MeV and a minimal spot size of 2 mm FWHM. For this particular accelerator, the energy determination with conventional beam diagnostics, for example, time of flight measurements, is imprecise due to the non-trivial longitudinal phase space of the beam. In contrast, a Thomson parabola is well suited to reliably determine the beam energy distribution. The Thomson parabola differentiates charged particles by energy and charge-to-mass ratio, through deflection of charged particles by electric and magnetic fields. During first proof-of-principle experiments, we achieved to reproduce the average initial helium beam energy as predicted by computer simulations with a deviation ofmore » only 1.4%25. Successful energy-loss measurements with 1 μm thick silicon nitride foils show the suitability of the accelerator for such experiments. The initial ion energy was determined during a primary measurement without a target, while a second measurement, incorporating the target, was used to determine the transmitted energy. The energy-loss was then determined as the difference between the two energies.« less

Authors:
 [1];  [2];  [2]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [3];  [3]; ORCiD logo [4]; ORCiD logo [4];  [4];  [5];  [2]
  1. Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, USA; Department of Nuclear Physics, Technical University Darmstadt, Schloßgartenstraße 9, 64289 Darmstadt, Germany
  2. Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, USA
  3. Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA
  4. Princeton Plasma Physics Laboratory, 100 Stellarator Road, Princeton, New Jersey 08540, USA
  5. Department of Nuclear Physics, Technical University Darmstadt, Schloßgartenstraße 9, 64289 Darmstadt, Germany
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)
OSTI Identifier:
1490055
Alternate Identifier(s):
OSTI ID: 1477817; OSTI ID: 1489662
Grant/Contract Number:  
AC02-05CH11231; AC52-07NA27344; AC0205CH11231; AC02-09CH11466; AC02-76SF00515
Resource Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 89; Journal Issue: 10; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Treffert, F., Ji, Q., Seidl, P. A., Persaud, A., Ludewigt, B., Barnard, J. J., Friedman, A., Grote, D. P., Gilson, E. P., Kaganovich, I. D., Stepanov, A., Roth, M., and Schenkel, T. Design and implementation of a Thomson parabola for fluence dependent energy-loss measurements at the Neutralized Drift Compression eXperiment. United States: N. p., 2018. Web. doi:10.1063/1.5030541.
Treffert, F., Ji, Q., Seidl, P. A., Persaud, A., Ludewigt, B., Barnard, J. J., Friedman, A., Grote, D. P., Gilson, E. P., Kaganovich, I. D., Stepanov, A., Roth, M., & Schenkel, T. Design and implementation of a Thomson parabola for fluence dependent energy-loss measurements at the Neutralized Drift Compression eXperiment. United States. doi:10.1063/1.5030541.
Treffert, F., Ji, Q., Seidl, P. A., Persaud, A., Ludewigt, B., Barnard, J. J., Friedman, A., Grote, D. P., Gilson, E. P., Kaganovich, I. D., Stepanov, A., Roth, M., and Schenkel, T. Mon . "Design and implementation of a Thomson parabola for fluence dependent energy-loss measurements at the Neutralized Drift Compression eXperiment". United States. doi:10.1063/1.5030541. https://www.osti.gov/servlets/purl/1490055.
@article{osti_1490055,
title = {Design and implementation of a Thomson parabola for fluence dependent energy-loss measurements at the Neutralized Drift Compression eXperiment},
author = {Treffert, F. and Ji, Q. and Seidl, P. A. and Persaud, A. and Ludewigt, B. and Barnard, J. J. and Friedman, A. and Grote, D. P. and Gilson, E. P. and Kaganovich, I. D. and Stepanov, A. and Roth, M. and Schenkel, T.},
abstractNote = {The interaction of ion beams with matter includes the investigation of the basic principles of ion stopping in heated materials. An unsolved question is the effect of different, especially higher, ion beam fluences on ion stopping in solid targets. This is relevant in applications such as in fusion sciences. To address this question, a Thomson parabola was built for the Neutralized Drift Compression eXperiment (NDCX-II) for ion energy-loss measurements at different ion beam fluences. The linear induction accelerator NDCX-II delivers 2 ns short, intense ion pulses, up to several tens of nC/pulse, or 1010-1011 ions, with a peak kinetic energy of ~1.1 MeV and a minimal spot size of 2 mm FWHM. For this particular accelerator, the energy determination with conventional beam diagnostics, for example, time of flight measurements, is imprecise due to the non-trivial longitudinal phase space of the beam. In contrast, a Thomson parabola is well suited to reliably determine the beam energy distribution. The Thomson parabola differentiates charged particles by energy and charge-to-mass ratio, through deflection of charged particles by electric and magnetic fields. During first proof-of-principle experiments, we achieved to reproduce the average initial helium beam energy as predicted by computer simulations with a deviation of only 1.4%25. Successful energy-loss measurements with 1 μm thick silicon nitride foils show the suitability of the accelerator for such experiments. The initial ion energy was determined during a primary measurement without a target, while a second measurement, incorporating the target, was used to determine the transmitted energy. The energy-loss was then determined as the difference between the two energies.},
doi = {10.1063/1.5030541},
journal = {Review of Scientific Instruments},
number = 10,
volume = 89,
place = {United States},
year = {2018},
month = {10}
}

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