Studies on synthesis of plasma fusion relevant tungsten dust particles and measurement of their hydrogen absorption properties

Sarmah, Trinayan; Aomoa, N.; Sarma, Sidananda; Deshpande, Uday; Satpati, Biswarup; Srivastava, Divesh N.; Kumar, Sanjiv; Kakati, M.; Temmerman, G. De

doi:10.1016/j.fusengdes.2017.12.005

Cited by 7 publications

(6 citation statements)

References 29 publications

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“…Research shows that tungsten (W) may be the most promising material in this regard [4,5]. Exposing W to high heat flux region of tokamak might result in the generation of nano to micron-sized dust particles in the system, which are often regarded as contaminants [6]. Therefore, understanding the dust charging mechanism becomes essential for removing them from the fusion devices [1].…”

Section: Introductionmentioning

confidence: 99%

“…The present study investigates the response of micron-sized W dust in the presence of energetic electrons in a low-pressure plasma environment. In fusion devices, it is usually seen that there is a fuel loss due to the retention of the fuel (H + ) by the dust [6]. This is a prime concern for the fusion devices, which may be avoided if the dust present in the device [6] is positively charged [7].…”

Section: Introductionmentioning

confidence: 99%

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Experimental study of charging of dust grains in the presence of energetic electrons

Paul¹,

Sharma²,

Deka³

et al. 2022

Plasma Phys. Control. Fusion

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The role of hot electrons in the charging of dust grains is investigated in a two-temperature hydrogen plasma. A variety of dust particles are introduced into the system and secondary electron emission (SEE) from each of the dust grains has been reported. A cylindrical Langmuir probe is used for determining the plasma parameters and a Faraday cup is connected to an electrometer in order to measure the dust current. The electrometer readings confirm the electron emission from the dust and SEE is observed from the tungsten dust in a low-pressure experimental plasma device for the first time.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental study of charging of dust grains in the presence of energetic electrons

Paul¹,

Sharma²,

Deka³

et al. 2022

Plasma Phys. Control. Fusion

View full text Add to dashboard Cite

show abstract

“…Research shows that tungsten(W) may be the most promising material in this regard [4,5]. Exposing W to high heat flux region of tokamak might result in generation of nano to micron sized dust particles in the system which is often regarded as contaminants [6]. Therefore, understanding the dust charging mechanism becomes essential for removing them from the fusion devices [1].…”

Section: Introductionmentioning

confidence: 99%

“…Present study investigates the response of micron-sized W dust in presence of energetic electrons in a low pressure plasma environment. In fusion devices, it is usually seen that there is a fuel loss due to the retention of the fuel (H + ) by the dust [6]. This is a prime concern for the fusion devices, which may be avoided if the dust present in the device [6] is positively charged [7].…”

Section: Introductionmentioning

confidence: 99%

Experimental study of charging of dust grains in presence of energetic electrons

Paul,

Sharma,

Deka

et al. 2021

Preprint

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The role of hot electrons in charging of dust grains is investigated in a two temperature hydrogen plasma. A variety of dust particles are introduced into the system and secondary electron emission (SEE) from each of the dust grains has been reported. A cylindrical Langmuir probe is used for determining the plasma parameters and a Faraday cup is connected to an electrometer in order to measure the dust current. The electrometer readings confirm the electron emission from the dust and SEE is observed from the tungsten dust in a low-pressure experimental plasma device for the first time.

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“…At the CIMPLE-PSI Laboratory, CPP-IPR, we had earlier established a segmented plasma torch assisted high heat flux (HHF) device, which could successfully reproduce ITER divertor relevant heat and ion flux under steady-state conditions, but the system could be operated effectively with argon only [12]. To study the melting of tungsten, bulk metal samples were exposed in this device, which had led to the condensation of micrometre sized crystals, with highly nonequilibrium skeletal and spherulitic morphologies from tungsten melt, observed for the first time in this metal [12,13]. In this present paper, we will report on the design, development and commissioning of a magnetized plasma divertor simulator system at this laboratory, which was configured broadly in the line of the MAGNUM-PSI and PILOT-PSI devices mentioned above but realized with a significantly smaller budget.…”

Section: Introductionmentioning

confidence: 99%

Design, development and recent experiments of the CIMPLE-PSI device

et al. 2019

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It is important to understand how the plasma with unparalleled heat (~10MWm-2) and ion (~1024 m-2s-1) flux will interact with the tungsten walls in the ITER tokamak, more specifically at the Divertor region of the fusion machine. Several linear magnetized plasma devices have been developed worldwide that reproduced ITER Divertor like extreme conditions for studies on relevant plasma surface interaction (PSI) issues under simulated plasma conditions. The "CPP-IPR Magnetized linear Divertor Plasma Experiment for Plasma Surface Interaction" or CIMPLE-PSI is one of the few Tokamak Divertor simulator devices that successfully reproduces both ITER-like ion and heat flux values, whose design, development and recent commissioning will be presented in this paper. A segmented plasma torch produced high-density plasma jet collimated with a maximum 0.45 Tesla axial magnetic field propagates at few Pascal chamber pressure that is maintained by four numbers of roots vacuum pumps with 14,000 m-3/h pumping capacity that interacts with a remotely placed tungsten target under controlled experimental conditions. The paper will report detailed diagnostics of the plasma jet through optical emission spectroscopic techniques (1.33 m McPherson spectrometer), a retractable Langmuir probe and water calorimeters while operating the plasma with helium and hydrogen mixture of gases. During recent PSI experiments in this device under irradiation of pure helium plasma (exposed for 1800 seconds under 0.3T magnetic field, target biased to-45 V), we had witnessed (FESEM, HRTEM) formation of surface nanotendrils in profuse amounts, recent characterization results from which also will be presented here.

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Studies on synthesis of plasma fusion relevant tungsten dust particles and measurement of their hydrogen absorption properties

Cited by 7 publications

References 29 publications

Experimental study of charging of dust grains in the presence of energetic electrons

Experimental study of charging of dust grains in the presence of energetic electrons

Experimental study of charging of dust grains in presence of energetic electrons

Design, development and recent experiments of the CIMPLE-PSI device

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