2025
article
OpenAlex
Mark E. Limes, Nezih Dural, Michael V. Romalis, Elizabeth L. Foley et autres
As the only stable spin-1/2 noble gas isotopes, 3He and 129Xe are promising systems for inertial rotation sensing and searches for exotic spin couplings. Spin-1/2 noble gases have intrinsic coherence times in the order of hours to days, which allows for incredibly …
us
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Accès ouvert
2024
preprint
OpenAlex
Mark E. Limes, Nezih Dural, Michael V. Romalis, Elizabeth L. Foley et autres
As the only stable spin-1/2 noble gas isotopes, $^{3}$He and $^{129}$Xe are promising systems for inertial rotation sensing and searches for exotic spin couplings. Spin-1/2 noble gases have intrinsic coherence times on the order of hours to days, which allows for incredibly …
Accès ouvert
2023
article
OpenAlex
L. Grisham
Measurement of the velocity distribution of confined energetic alpha particles resulting from deuterium-tritium fusion reactions in a magnetically contained plasma is provided. The fusion plasma is seeded with energetic boron neutrals for producing, by means of the reaction 10B ($\alpha$,n) 13N reaction, …
us
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Accès ouvert
2023
article
OpenAlex
L. Grisham
The present invention provides systems and methods for the magnetic insulation of accelerator electrodes in electrostatic accelerators. Advantageously, the systems and methods of the present invention improve the practically obtainable performance of these electrostatic accelerators by addressing, among other things, voltage holding …
Accès ouvert
2021
article
OpenAlex
M. Kashiwagi, J. Hiratsuka, Masahiro Ichikawa, G. Q. Saquilayan et autres
Abstract In the negative-ion-based neutral beam injector (N-NBI) of JT-60SA, a hydrogen negative ion beam with energy of 500 keV and a current density of 154 A m −2 for 118 s has been successfully demonstrated. This achievement exceeds the requirements (500 …
jp, us
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Accès ouvert
2019
article
OpenAlex
Mark E. Limes, Nezih Dural, Michael V. Romalis, Elizabeth L. Foley et autres
We study nuclear spin frequency shifts in a $^{3}\mathrm{He}\text{\ensuremath{-}}^{129}\mathrm{Xe}$ comagnetometer caused by spin polarization of $^{3}\mathrm{He}$. We use stemless cylindrical cells to systematically vary the cell geometry and separately measure the cell shape-dependent and shape-independent frequency shifts. We find that a certain …
us, fi
(code pays fourni par la source)
Accès ouvert
2019
article
OpenAlex
A. Kojima, H. Tobari, N. Umeda, M. Kashiwagi et autres
For the realization of the ITER neutral beam (NB) system, a method for achieving the acceleration voltage of 1 MV for the vacuum insulated beam source (VIBS) has been developed. Additionally, the design basis for the 1 MV vacuum insulation has also …
jp, us
(code pays fourni par la source)
2017
conference-abstract
OpenAlex
A.D. Stepanov, E.P. Gilson, L. Grisham, Igor Kaganovich et autres
Ferroelectric Plasma Sources (FEPS) can generate plasma that provides effective space-charge neutralization of intense high-perveance ion beams. Here we present experimental results on charge neutralization of a high-perveance 38 keV Ar+beam by a FEPS plasma. By comparing the measured beam radius with …
us
(code pays fourni par la source)
2017
article
OpenAlex
A. Kojima, J. Hiratsuka, N. Umeda, Masaya Hanada et autres
jp, us
(code pays fourni par la source)
Accès ouvert
2016
article
OpenAlex
A.D. Stepanov, E.P. Gilson, L. Grisham, Igor Kaganovich et autres
Ferroelectric Plasma Sources (FEPSs) can generate plasma that provides effective space-charge neutralization of intense high-perveance ion beams, as has been demonstrated on the Neutralized Drift Compression Experiment NDCX-I and NDCX-II. This article presents experimental results on charge neutralization of a high-perveance 38 …
us
(code pays fourni par la source)
2015
article
OpenAlex
M. Yoshida, M. Hanada, Akira Kojima, M. Kashiwagi et autres
To understand the physics of the cesium (Cs) recycling in the large Cs-seeded negative ion sources relevant to ITER and JT-60SA with ion extraction area of 45-60 cm × 110-120 cm, the time evolution of the negative ion profile was precisely measured …
jp, us
(code pays fourni par la source)
2015
article
OpenAlex
M. Hanada, A. Kojima, H. Tobari, Ryo Nishikiori et autres
In order to realize negative ion sources and accelerators to be applicable to International Thermonuclear Experimental Reactor and JT-60 Super Advanced, a large cesium (Cs)-seeded negative ion source and a multi-aperture and multi-stage electric acceleration have been developed at Japan Atomic Energy …
jp, us
(code pays fourni par la source)