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

Renk, Timothy Jerome; Harper-Slaboszewicz, Victor Jozef; Mikkelson, Kenneth A.; Ginn, W. C.; Ottinger, P. F.; Schumer, J. W.

doi:10.1063/1.4903947

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

Journal Article · Sun Dec 14 23:00:00 EST 2014 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4903947· OSTI ID:1183086

Renk, Timothy Jerome ^[1]; Harper-Slaboszewicz, Victor Jozef ^[1]; Mikkelson, Kenneth A. ^[1]; Ginn, W. C. ^[1]; Ottinger, P. F. ^[2]; Schumer, J. W. ^[3]

Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
ENGILITY, Chantilly, VA (United States)
Naval Research Lab. (NRL), Washington, DC (United States)

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.

View Accepted Manuscript (DOE)

Research Organization:: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC04-94AL85000

OSTI ID:: 1183086

Alternate ID(s):: OSTI ID: 1421124
OSTI ID: 22407937

Report Number(s):: SAND--2014-16767J; 536639

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 12 Vol. 21; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Method for improved voltage determination for pulsed power systems utilizing a magnetically insulated transmission line Ottinger, P. F.; Renk, T. J.; Schumer, J. W. Physics of Plasmas, Vol. 26, Issue 2 https://doi.org/10.1063/1.5084733	journal	February 2019
Particle-in-cell simulations of current loss in magnetically insulated transmission line with inductive helical support Luo, Wei; Li, Yongdong; Wang, Hongguang Unpublished https://doi.org/10.13140/rg.2.2.11710.64321	text	January 2019

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