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Title: Use of a radial self-field diode geometry for intense pulsed ion beam generation at 6 MeV on Hermes III

Abstract

We investigate the generation of intense pulsed focused ion beams at the 6 MeV level using an inductive voltage adder (IVA) pulsed-power generator, which employs a magnetically insulated transmission line (MITL). Such IVA machines typical run at an impedance of few tens of Ohms. Previous successful intense ion beam generation experiments have often featured an “axial” pinch-reflex ion diode (i.e., with an axial anode-cathode gap) and operated on a conventional Marx generator/water line driver with an impedance of a few Ohms and no need for an MITL. The goals of these experiments are to develop a pinch-reflex ion diode geometry that has an impedance to efficiently match to an IVA, produces a reasonably high ion current fraction, captures the vacuum electron current flowing forward in the MITL, and focuses the resulting ion beam to small spot size. Furthermore, a new “radial” pinch-reflex ion diode (i.e., with a radial anode-cathode gap) is found to best demonstrate these properties. Operation in both positive and negative polarities was undertaken, although the negative polarity experiments are emphasized. Particle-in-cell (PIC) simulations are consistent with experimental results indicating that, for diode impedances less than the self-limited impedance of the MITL, almost all of the forward-going IVAmore » vacuum electron flow current is incorporated into the diode current. PIC results also provide understanding of the diode-impedance and ion-focusing properties of the diode. Additionally, a substantial high-energy ion population is also identified propagating in the “reverse” direction, i.e., from the back side of the anode foil in the electron beam dump.« less

Authors:
 [1];  [1];  [1];  [1];  [2];  [3]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  2. ENGILITY, Chantilly, VA (United States)
  3. Naval Research Lab. (NRL), Washington, DC (United States)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1183086
Alternate Identifier(s):
OSTI ID: 1421124
Report Number(s):
SAND-2014-16767J
Journal ID: ISSN 1070-664X; 536639
Grant/Contract Number:  
AC04-94AL85000
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 21; Journal Issue: 12; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Renk, Timothy Jerome, Harper-Slaboszewicz, Victor Jozef, Mikkelson, Kenneth A., Ginn, W. C., Ottinger, P. F., and Schumer, J. W. Use of a radial self-field diode geometry for intense pulsed ion beam generation at 6 MeV on Hermes III. United States: N. p., 2014. Web. doi:10.1063/1.4903947.
Renk, Timothy Jerome, Harper-Slaboszewicz, Victor Jozef, Mikkelson, Kenneth A., Ginn, W. C., Ottinger, P. F., & Schumer, J. W. Use of a radial self-field diode geometry for intense pulsed ion beam generation at 6 MeV on Hermes III. United States. https://doi.org/10.1063/1.4903947
Renk, Timothy Jerome, Harper-Slaboszewicz, Victor Jozef, Mikkelson, Kenneth A., Ginn, W. C., Ottinger, P. F., and Schumer, J. W. Mon . "Use of a radial self-field diode geometry for intense pulsed ion beam generation at 6 MeV on Hermes III". United States. https://doi.org/10.1063/1.4903947. https://www.osti.gov/servlets/purl/1183086.
@article{osti_1183086,
title = {Use of a radial self-field diode geometry for intense pulsed ion beam generation at 6 MeV on Hermes III},
author = {Renk, Timothy Jerome and Harper-Slaboszewicz, Victor Jozef and Mikkelson, Kenneth A. and Ginn, W. C. and Ottinger, P. F. and Schumer, J. W.},
abstractNote = {We investigate the generation of intense pulsed focused ion beams at the 6 MeV level using an inductive voltage adder (IVA) pulsed-power generator, which employs a magnetically insulated transmission line (MITL). Such IVA machines typical run at an impedance of few tens of Ohms. Previous successful intense ion beam generation experiments have often featured an “axial” pinch-reflex ion diode (i.e., with an axial anode-cathode gap) and operated on a conventional Marx generator/water line driver with an impedance of a few Ohms and no need for an MITL. The goals of these experiments are to develop a pinch-reflex ion diode geometry that has an impedance to efficiently match to an IVA, produces a reasonably high ion current fraction, captures the vacuum electron current flowing forward in the MITL, and focuses the resulting ion beam to small spot size. Furthermore, a new “radial” pinch-reflex ion diode (i.e., with a radial anode-cathode gap) is found to best demonstrate these properties. Operation in both positive and negative polarities was undertaken, although the negative polarity experiments are emphasized. Particle-in-cell (PIC) simulations are consistent with experimental results indicating that, for diode impedances less than the self-limited impedance of the MITL, almost all of the forward-going IVA vacuum electron flow current is incorporated into the diode current. PIC results also provide understanding of the diode-impedance and ion-focusing properties of the diode. Additionally, a substantial high-energy ion population is also identified propagating in the “reverse” direction, i.e., from the back side of the anode foil in the electron beam dump.},
doi = {10.1063/1.4903947},
url = {https://www.osti.gov/biblio/1183086}, journal = {Physics of Plasmas},
issn = {1070-664X},
number = 12,
volume = 21,
place = {United States},
year = {2014},
month = {12}
}

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