First Experiment on Erosion Dust Measurement in a Tokamak

Charuau, J.; Djerassi, H.

doi:10.1016/b978-0-444-87369-9.50119-0

Cited by 11 publications

(4 citation statements)

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“…Historically a maximum releasable dust inventory of 1 g per Kg deposited has been assumed for JET LOVA/ LOCAs in the safety case [3]. Specifically, this was based on analysis of JET shutdowns and measurement of suspended dust levels on venting the machine reported in 1994 [20,21]. If all deposited films are considered as potentially dust i.e.…”

Section: Inventory At Riskmentioning

confidence: 99%

An overview of the preparation and implementation of the safety case in support of the 2nd JET deuterium–tritium experiment

Johnston,

Perry

2024

Plasma Phys. Control. Fusion

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An overview of the preparation and implementation of the JET DTE2 Safety Case is presented. The Safety Case regime, developed by UKAEA for fusion applications to demonstrate compliance with relevant regulations, and its implementation on UKAEA sites is outlined. The hazard assessment process and details of the methodology applied to assess key JET fault scenarios are provided. An outline of key inventories, their composition, and applied factors for consequence and risk assessment are discussed. The consequences resulting from key fault sequences, the designation of appropriate safety measures and the associated risks are summarised and compared against Basic Safety Limits and Objectives. Finally, some of the lessons learned from DTE2 following implementation are discussed.

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Section: Inventory At Riskmentioning

confidence: 99%

An overview of the preparation and implementation of the safety case in support of the 2nd JET deuterium–tritium experiment

Johnston,

Perry

2024

Plasma Phys. Control. Fusion

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“…It is envisioned that the system can collect and transport dust from fusion experimental reactors with a high vacuum environment and a magnetic field. The primary research results are as follows: (1) Using a fully insulated electrode with a single-phase AC voltage up to 15 kV, aluminum and carbon dust were floated and collected under vacuum. (2) The highest collection rates attained for the aluminum and carbon dust were around 30 and 2 g/min, respectively.…”

Section: Discussionmentioning

confidence: 99%

“…1 Example of dust removal system the strength of the electric field has a gradient in space, the polarization force (gradient force) acts on the particle due to the interaction between the charged particle and the non-uniform electric field(13)- (15). As a result, the particle moves due to the Coulomb and gradient forces induced by the electric field.…”

Section: To Outsidementioning

confidence: 99%

Development of Dust Removal System Using Static Electricity for Fusion Experimental Reactors.

Onozuka

Ueda

Oda

et al. 1997

J. Nucl. Sci. Technol.

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Tests to collect and transport metallic and non-metallic dust particles have been conducted using static electricity in a vacuum environment to investigate the applicability of a static electricity dust removal system for fusion experimental reactors. The dust particles are charged by electrostatic induction, floated and collected due to the Coulomb force generated by the AC electric field. They are then transported due to the gradient force induced by the electric curtain of the non-uniform travelling-wave electric field. Using a fully insulated electrode with a single-phase AC voltage up to 15 kV, aluminum and carbon dust were successfully collected. The highest collection rates for the aluminum and carbon dust were around 30 and 2g/min, respectively. The linear-type electrodes, using as high as 22kV of the three-phase AC voltage, transported aluminum dust up to an angle of 60". Applying a guide electrode to the linear-type electrode, the transportation rate was approximately doubled and almost constant at every angle, including a 90" angle. The system transported aluminum dust up to the rate of 13 g/min. The influence of the 0.15T magnetic field on the dust collection and transportation efficiencies was found to be negligible.

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“…The dust size expected is between 0.1 and 1000 µm [1,5,[15][16][17]. The highest dust inventory has been reported to be around kilograms for the tokamak TFTR [18], and grams have been reported in JET [19,20] and JT-60 [21]. However, in future devices larger amounts are expected: 100 kg for ITER [6], and 10 kg for DEMO [7,8].…”

Section: Introductionmentioning

confidence: 99%

STARDUST-U experiments on fluid-dynamic conditions affecting dust mobilization during LOVAs

et al. 2016

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Since 2006 the Quantum Electronics and Plasma Physics (QEP) Research Group together with ENEA FusTech of Frascati have been working on dust re-suspension inside tokamaks and its potential capability to jeopardize the integrity of future fusion nuclear plants (i.e. ITER or DEMO) and to be a risk for the health of the operators. Actually, this team is working with the improved version of the "STARDUST" facility, i.e. "STARDUST-Upgrade". STARDUST-U facility has four new air inlet ports that allow the experimental replication of Loss of Vacuum Accidents (LOVAs). The experimental campaign to detect the different pressurization rates, local air velocity, temperature, have been carried out from all the ports in different accident conditions and the principal results will be analyzed and compared with the numerical simulations obtained through a CFD (Computational Fluid Dynamic) code. This preliminary thermo fluid-dynamic analysis of the accident is crucial for numerical model development and validation, and for the incoming experimental campaign of dust resuspension inside STARDUST-U due to well-defined accidents presented in this paper. K: Data acquisition concepts; Nuclear instruments and methods for hot plasma diagnostics 1Corresponding author.

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First Experiment on Erosion Dust Measurement in a Tokamak

Cited by 11 publications

References 1 publication

An overview of the preparation and implementation of the safety case in support of the 2nd JET deuterium–tritium experiment

An overview of the preparation and implementation of the safety case in support of the 2nd JET deuterium–tritium experiment

Development of Dust Removal System Using Static Electricity for Fusion Experimental Reactors.

STARDUST-U experiments on fluid-dynamic conditions affecting dust mobilization during LOVAs

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