Identification of rippling interface between laser-ablated plasma and ambient uniform plasma at rest
Abstract
We present laboratory experiments on the early stage of the formation process of quasi-perpendicular supercritical magnetized collisionless shocks using laser-produced plasmas in an ambient uniform nitrogen (N) gas with 1~Torr under the external magnetic field with controlled polarity. An expanding aluminum (Al) piston plasma arising from laser irradiation interacts with a magnetized ambient N plasma, producing a bright, asymmetric self-emission whose global morphology reverses with the magnetic-field polarity. Two-dimensional ideal-magnetohydrodynamics simulations reproduce the main features of the observed structures and indicate that the ripple formation is unlikely to be driven by the Kelvin--Helmholtz instability, but is instead associated with vortex formation at the rounded leading edge of the piston plasma. We show that the bright, rippling emission delineates the Al-N interface, whose intrinsic width is consistent with an electron kinetic scale, and that its upstream side is predominantly composed of N plasma. This identification allows the formation of a supercritical collisionless shock in the magnetized N plasma to be discussed with minimal Al contamination.
Versions
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BibTeX
@misc{yamazaki2026identification,
title = {{Identification of rippling interface between laser-ablated plasma and ambient uniform plasma at rest}},
author = {Ryo Yamazaki and S. Tomita and T. Takezaki and T. Morita and S. J. Tanaka and Y. Ohira and T. Umeda and K. Aihara and S. Kambayashi and R. Kawamura and K. Obayashi and M. Murakoshi and Y. Sato and R. Shiina and A. Takata and K. Matsui and S. Ueno and Y. Kidokoro and S. Yakura and Y. Okada and S. Suzuki and H. Kondo and N. Shimoda and J. Shiota and Y. Sudo and D. Suzuki and K. Sugiyama and A. Morita and H. Kawakatsu and A. Kashima and Y. Ishimura and K. Umehara and S. Egashira and H. Ishihara and O. Kuramoto and Y. Matsumoto and K. Maeda and Y. Suzuki and M. Hanano and Y. Toyoda and K. Kuramoto and F. Nikaido and K. Iida and Y. Naito and Y. Sato and K. Takahashi and K. Nakahara and Y. Maenosono and Y. Muramoto and Y. Kanesada and K. Koba and T. Ogawa and R. Shiiba and T. Oguchi and M. Edamoto and M. Iwamoto and M. Hoshino and T. Inoue and S. Isayama and A. T. Ishii},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.34057},
eprint = {2610.34057},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.34057},
}
RIS
TY - UNPB
TI - Identification of rippling interface between laser-ablated plasma and ambient uniform plasma at rest
AU - Ryo Yamazaki
AU - S. Tomita
AU - T. Takezaki
AU - T. Morita
AU - S. J. Tanaka
AU - Y. Ohira
AU - T. Umeda
AU - K. Aihara
AU - S. Kambayashi
AU - R. Kawamura
AU - K. Obayashi
AU - M. Murakoshi
AU - Y. Sato
AU - R. Shiina
AU - A. Takata
AU - K. Matsui
AU - S. Ueno
AU - Y. Kidokoro
AU - S. Yakura
AU - Y. Okada
AU - S. Suzuki
AU - H. Kondo
AU - N. Shimoda
AU - J. Shiota
AU - Y. Sudo
AU - D. Suzuki
AU - K. Sugiyama
AU - A. Morita
AU - H. Kawakatsu
AU - A. Kashima
AU - Y. Ishimura
AU - K. Umehara
AU - S. Egashira
AU - H. Ishihara
AU - O. Kuramoto
AU - Y. Matsumoto
AU - K. Maeda
AU - Y. Suzuki
AU - M. Hanano
AU - Y. Toyoda
AU - K. Kuramoto
AU - F. Nikaido
AU - K. Iida
AU - Y. Naito
AU - Y. Sato
AU - K. Takahashi
AU - K. Nakahara
AU - Y. Maenosono
AU - Y. Muramoto
AU - Y. Kanesada
AU - K. Koba
AU - T. Ogawa
AU - R. Shiiba
AU - T. Oguchi
AU - M. Edamoto
AU - M. Iwamoto
AU - M. Hoshino
AU - T. Inoue
AU - S. Isayama
AU - A. T. Ishii
PY - 2026
DA - 2026/10/25
PB - arXiv
DO - 10.48550/arxiv.2610.34057
UR - https://arxiv.org/abs/2610.34057
AB - We present laboratory experiments on the early stage of the formation process of quasi-perpendicular supercritical magnetized collisionless shocks using laser-produced plasmas in an ambient uniform nitrogen (N) gas with 1~Torr under the external magnetic field with controlled polarity. An expanding aluminum (Al) piston plasma arising from laser irradiation interacts with a magnetized ambient N plasma, producing a bright, asymmetric self-emission whose global morphology reverses with the magnetic-field polarity. Two-dimensional ideal-magnetohydrodynamics simulations reproduce the main features of the observed structures and indicate that the ripple formation is unlikely to be driven by the Kelvin--Helmholtz instability, but is instead associated with vortex formation at the rounded leading edge of the piston plasma. We show that the bright, rippling emission delineates the Al-N interface, whose intrinsic width is consistent with an electron kinetic scale, and that its upstream side is predominantly composed of N plasma. This identification allows the formation of a supercritical collisionless shock in the magnetized N plasma to be discussed with minimal Al contamination.
ER -