Bulletin of the American Physical Society
64th Annual Meeting of the APS Division of Plasma Physics
Volume 67, Number 15
Monday–Friday, October 17–21, 2022; Spokane, Washington
Session TP11: Poster Session VII: In-Person, Hall A (9:30-11:00am) and Virtual Poster Presentations (11:15am-12:30pm)
MFE: FRC, RFPs etc
ICF: Fast Ignition; Diagnostics; Computational; Laser Plasma Interactions
FUND: Computation
9:30 AM - 12:30 PM
Thursday, October 20, 2022
Room: Exhibit Hall A and Online
Abstract: TP11.00092 : Efficient kinetic simulations in the Z inner MITL*
Presenter:
Evstati G Evstatiev
(Sandia National Laboratories)
Authors:
Evstati G Evstatiev
(Sandia National Laboratories)
Mark H Hess
(Sandia National Laboratories)
is subjected to extreme fields, of the order of 100s of Tesla
and 100s of MV/m. Kinetic simulations, preferred in MITL numerical design,
can be very computationally expensive. The challenge comes from
two main constraints on the time step, the small Larmor period of electrons
and the Courant condition. To lift these restrictions, we utilize the
operational parameters on Z, namely, the time scale of the current pulse
on Z (~100ns) and the dimensions of the inner MITL (~10cm).
For such parameters, one could use an electrostatic and magnetostatic
fields model to remove the Courant limit. In the strong magnetic fields, we show
that a drift kinetic guiding center model for electrons can be used
as an approximation, removing the need to resolve the Larmor period.
As a test problem we model space charge limited emission (SCL) from the
cathode due to field stress. We show that typically observed vortex
formation and evolution can be well reproduced by using only drift kinetic
particles. We also discuss the possibility of a hybrid full kinetic and
drift kinetic approach.
*SNL is managed and operated by NTESS under DOE NNSA contract DE-NA0003525.This work was supported by the SNL Exploratory Express-LDRD \#226348.
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