Investigation of Supersonic Molecular Beam Injection into the HL-1M Tokamak

Yao, Lina; Feng, Binhua; Dong, Jing; Zhang, Yan; Cui, Z.Y.; Cao, Jianyong; Nianyi, Tang; Feng, Zhaochi; Zhenggui, Xiao; Song, X.M.; Hong, W.Y.; Enyao, Wang; Liu, Yong

doi:10.13182/fst02-a217

Cited by 4 publications

(2 citation statements)

References 12 publications

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“…An SMBI system was utilized in HL-1 tokamak for the first time [8]. Then it was used for a plasma fuelling study in HL-1M with a formal report in 1998 [9].…”

Section: History Of Smbi and Its Application In Hl-2a And Kstarmentioning

confidence: 99%

ELM mitigation by supersonic molecular beam injection: KSTAR and HL-2A experiments and theory

et al. 2014

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We report recent experimental results from HL-2A and KSTAR on ELM mitigation by supersonic molecular beam injection (SMBI). Cold particle deposition within the pedestal by SMBI is verified in both machines.The signatures of ELM mitigation by SMBI are an ELM frequency increase and ELM amplitude decrease.These persist for an SMBI influence time τI. Here, τI is the time for the SMBI influenced pedestal profile to refill. An increase in f SMBI ELM /f 0 ELM and a decrease in the energy loss per ELM WELM were achieved in both machines. Physical insight was gleaned from studies of density and vφ(toroidal rotation velocity) evolution, particle flux and turbulence spectra, divertor heat load. The characteristic gradients of the pedestal density soften and a change in vφwas observed during a τI time. The spectra of the edge particle flux Г~ < ˜vr˜ne> and density fluctuation with and without SMBI were measured in HL-2A and in KSTAR, respectively. A clear phenomenon observed is the decrease in divertor heat load during the τI time in HL-2A. Similar results are the profiles of saturation current density Jsat with and without SMBI in KSTAR. We note that τI/τp (particle confinement time) is close to ~1, although there is a large difference in individual τI between the two machines. This suggests that τI is strongly related to particle-transport events. Experiments and analysis of a simple phenomenological model support the important conclusion that ELM mitigation by SMBI results from an increase in higher frequency fluctuations and transport events in the pedestal.

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“…An SMBI system was utilized in HL-1 tokamak for the first time [8]. Then it was used for a plasma fuelling study in HL-1M with a formal report in 1998 [9].…”

Section: History Of Smbi and Its Application In Hl-2a And Kstarmentioning

confidence: 99%

ELM mitigation by supersonic molecular beam injection: KSTAR and HL-2A experiments and theory

et al. 2014

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“…1,2 As of today, cluster beams have been successfully injected into the HL-1M tokamak and HT-7 superconducting tokamak. 3,4 Another interesting development has been the observation that nuclear fusion can be initiated by heating deuterium clusters with femtosecond lasers; this technique ultimately may lead to the development of tabletop neutron sources. 5 H 3 + ions play an important role in the chemistry of interstellar clouds as efficient protonators of neutral molecules, and they may act as traps for noble gas atoms in astrophysical objects.…”

Section: Introductionmentioning

confidence: 99%

Formation of even-numbered hydrogen cluster cations in ultracold helium droplets

Jaksch

Mauracher

Bacher

et al. 2008

The Journal of Chemical Physics

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Neutral hydrogen clusters are grown in ultracold helium nanodroplets by successive pickup of hydrogen molecules. Even-numbered hydrogen cluster cations are observed upon electron-impact ionization with and without attached helium atoms and in addition to the familiar odd-numbered H(n)(+). The helium matrix affects the fragmentation dynamics that usually lead to the formation of overwhelmingly odd-numbered H(n)(+). The use of high-resolution mass spectrometry allows the unambiguous identification of even-numbered H(n)(+) up to n approximately = 120 by their mass excess that distinguishes them from He(n)(+), mixed He(m)H(n)(+), and background ions. The large range in size of these hydrogen cluster ions is unprecedented, as is the accuracy of their definition. Apart from the previously observed magic number n=6, pronounced drops in the abundance of even-numbered cluster ions are seen at n=30 and 114, which suggest icosahedral shell closures at H(6)(+)(H(2))(12) and H(6)(+)(H(2))(54). Possible isomers of H(6)(+) are identified at the quadratic configuration interaction with inclusion of single and double excitations (QCISD)/aug-cc-pVTZ level of theory.

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A coupled NS-DSMC method applied to supersonic molecular beam and experimental validation

Zhang

et al. 2023

Vacuum

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Investigation of Supersonic Molecular Beam Injection into the HL-1M Tokamak

Cited by 4 publications

References 12 publications

ELM mitigation by supersonic molecular beam injection: KSTAR and HL-2A experiments and theory

ELM mitigation by supersonic molecular beam injection: KSTAR and HL-2A experiments and theory

Formation of even-numbered hydrogen cluster cations in ultracold helium droplets

A coupled NS-DSMC method applied to supersonic molecular beam and experimental validation

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