Plasma Heating due to Cyclic Diffusion across a Separatrix
Abstract
We observe plasma heating due to collisional diffusion across a separatrix when a magnesium ion column in a Penning-Malmberg trap is cyclically pushed back and forth across a partial trapping barrier. The barrier is an externally applied axisymmetric “squeeze” potential, which creates a velocity separatrix between trapped and passing particles. Weak ion-ion collisions then cause separatrix crossings, leading to irreversible heating. Furthermore, the heating rate scales as the square root of the oscillation rate times the collision frequency and thus can be dominant for low-collisionality plasmas. The particle velocity distribution function is measured with coherent laser induced fluorescence and shows passing and trapped particles having an out-of-phase response to the forced plasma oscillations.
- Authors:
-
- Univ. of California San Diego, La Jolla, CA (United States)
- Publication Date:
- Research Org.:
- Univ. of California, San Diego, CA (United States); Oak Ridge Associated Univ., Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1612891
- Alternate Identifier(s):
- OSTI ID: 1560729
- Grant/Contract Number:
- SC0018236; SC0014664
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review Letters
- Additional Journal Information:
- Journal Volume: 123; Journal Issue: 10; Journal ID: ISSN 0031-9007
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Physics; Plasma transport
Citation Formats
Anderegg, F., Affolter, M., Dubin, D. H. E., and Driscoll, C. F. Plasma Heating due to Cyclic Diffusion across a Separatrix. United States: N. p., 2019.
Web. doi:10.1103/physrevlett.123.105002.
Anderegg, F., Affolter, M., Dubin, D. H. E., & Driscoll, C. F. Plasma Heating due to Cyclic Diffusion across a Separatrix. United States. https://doi.org/10.1103/physrevlett.123.105002
Anderegg, F., Affolter, M., Dubin, D. H. E., and Driscoll, C. F. Fri .
"Plasma Heating due to Cyclic Diffusion across a Separatrix". United States. https://doi.org/10.1103/physrevlett.123.105002. https://www.osti.gov/servlets/purl/1612891.
@article{osti_1612891,
title = {Plasma Heating due to Cyclic Diffusion across a Separatrix},
author = {Anderegg, F. and Affolter, M. and Dubin, D. H. E. and Driscoll, C. F.},
abstractNote = {We observe plasma heating due to collisional diffusion across a separatrix when a magnesium ion column in a Penning-Malmberg trap is cyclically pushed back and forth across a partial trapping barrier. The barrier is an externally applied axisymmetric “squeeze” potential, which creates a velocity separatrix between trapped and passing particles. Weak ion-ion collisions then cause separatrix crossings, leading to irreversible heating. Furthermore, the heating rate scales as the square root of the oscillation rate times the collision frequency and thus can be dominant for low-collisionality plasmas. The particle velocity distribution function is measured with coherent laser induced fluorescence and shows passing and trapped particles having an out-of-phase response to the forced plasma oscillations.},
doi = {10.1103/physrevlett.123.105002},
journal = {Physical Review Letters},
number = 10,
volume = 123,
place = {United States},
year = {Fri Sep 06 00:00:00 EDT 2019},
month = {Fri Sep 06 00:00:00 EDT 2019}
}
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