Time-implicit fluid/particle hybrid simulations of the anode plasma dynamics in ion diodes
- Sandia National Laboratories, Albuquerque, New Mexico87185-1187 (United States)
Applied-B ion diode experiments with Li{sup +1} ion sources on the PBFA II and SABRE ion accelerators show that early in the pulse the beam is essentially pure Li{sup +1}, but is rapidly overwhelmed by impurity ions, called the {open_quote}parasitic load{close_quote}. Furthermore, the increasing parasitic current rapidly drops the diode voltage, limiting the accelerator power that can be coupled into the beam. This {open_quote}impedance collapse{close_quote} is believed to arise from the desorption of impurity neutrals from the anode surface. These neutrals charge-exchange with the ions, rapidly expanding into the anode-cathode gap where they are ionized by beam ions or secondary electrons. In order to model these processes we are developing a 11/2D electrostatic multifluid/PIC (hybrid) code, designed to self-consistently simulate collisional plasma/neutral systems with an arbitrary number of interacting species, over greatly varying density regimes and together with applied electric and magnetic fields. {copyright} {ital 1997 American Institute of Physics.}
- Research Organization:
- Sandia National Laboratory
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC04-94AL85000
- OSTI ID:
- 624794
- Report Number(s):
- CONF-970407--
- Journal Information:
- AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 406; ISSN 0094-243X; ISSN APCPCS
- Country of Publication:
- United States
- Language:
- English
Similar Records
Modeling ion diodes with dense anode plasmas
The role of anode and cathode plasmas in high power ion diode performance