Overview of recent developments in pellet injection for ITER

Stephen Kirk Combs; L. R. Baylor; S. J. Meitner; J. B.O. Caughman; D. A. Rasmussen; S. Maruyama

doi:10.1016/j.fusengdes.2012.01.039

Overview of recent developments in pellet injection for ITER

Stephen Kirk Combs
, L. R. Baylor
, S. J. Meitner
, J. B.O. Caughman
, D. A. Rasmussen
, S. Maruyama

Research output: Contribution to journal › Article › peer-review

49 Scopus citations

Abstract

Pellet injection is the primary fueling technique planned for core fueling of ITER burning plasmas. Also, the injection of relatively small pellets to purposely trigger rapid small edge localized modes (ELMs) has been proposed as a possible solution to the heat flux damage from larger natural ELMs likely to be an issue on the ITER divertor surfaces. The ITER pellet injection system is designed to inject pellets into the plasma through both inner and outer wall guide tubes. The inner wall guide tubes will provide high throughput pellet fueling while the outer wall guide tubes will be used primarily to trigger ELMs at a high frequency (>15 Hz). The pellet fueling rate of each injector is to be up to 120 Pa m ³/s, which will require the formation of solid D-T at a volumetric rate of ∼1500 mm ³/s. Two injectors are to be provided for ITER at the startup with a provision for up to six injectors during the D-T phase. The required throughput of each injector is greater than that of any injector built to date, and a novel twin-screw continuous extrusion system is being developed to meet the challenging design parameters. Status of the development activities is presented, highlighting recent progress.

Original language	English
Pages (from-to)	634-640
Number of pages	7
Journal	Fusion Engineering and Design
Volume	87
Issue number	5-6
DOIs	https://doi.org/10.1016/j.fusengdes.2012.01.039
State	Published - Aug 2012

Funding

This work was supported by the Oak Ridge National Laboratory managed by UT-Battelle, LLC for the U.S. Department of Energy under Contract No. DE-AC05-00OR22725. This report was prepared as an account of work by or for the ITER Organization. The Members of the Organization are the People's Republic of China, the European Atomic Energy Community, the Republic of India, Japan, the Republic of Korea, the Russian Federation, and the United States of America. The views and opinions expressed herein do not necessarily reflect those of the ITER Organization. Dissemination of the information in this paper is governed by the applicable terms of the ITER Joint Implementation Agreement.

Keywords

Core fueling
D-T
ELM pacing
ITER
Pellet injection
Plasma control

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10.1016/j.fusengdes.2012.01.039

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title = "Overview of recent developments in pellet injection for ITER",

abstract = "Pellet injection is the primary fueling technique planned for core fueling of ITER burning plasmas. Also, the injection of relatively small pellets to purposely trigger rapid small edge localized modes (ELMs) has been proposed as a possible solution to the heat flux damage from larger natural ELMs likely to be an issue on the ITER divertor surfaces. The ITER pellet injection system is designed to inject pellets into the plasma through both inner and outer wall guide tubes. The inner wall guide tubes will provide high throughput pellet fueling while the outer wall guide tubes will be used primarily to trigger ELMs at a high frequency (>15 Hz). The pellet fueling rate of each injector is to be up to 120 Pa m 3/s, which will require the formation of solid D-T at a volumetric rate of ∼1500 mm 3/s. Two injectors are to be provided for ITER at the startup with a provision for up to six injectors during the D-T phase. The required throughput of each injector is greater than that of any injector built to date, and a novel twin-screw continuous extrusion system is being developed to meet the challenging design parameters. Status of the development activities is presented, highlighting recent progress.",

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AU - Meitner, S. J.

AU - Caughman, J. B.O.

AU - Rasmussen, D. A.

AU - Maruyama, S.

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AB - Pellet injection is the primary fueling technique planned for core fueling of ITER burning plasmas. Also, the injection of relatively small pellets to purposely trigger rapid small edge localized modes (ELMs) has been proposed as a possible solution to the heat flux damage from larger natural ELMs likely to be an issue on the ITER divertor surfaces. The ITER pellet injection system is designed to inject pellets into the plasma through both inner and outer wall guide tubes. The inner wall guide tubes will provide high throughput pellet fueling while the outer wall guide tubes will be used primarily to trigger ELMs at a high frequency (>15 Hz). The pellet fueling rate of each injector is to be up to 120 Pa m 3/s, which will require the formation of solid D-T at a volumetric rate of ∼1500 mm 3/s. Two injectors are to be provided for ITER at the startup with a provision for up to six injectors during the D-T phase. The required throughput of each injector is greater than that of any injector built to date, and a novel twin-screw continuous extrusion system is being developed to meet the challenging design parameters. Status of the development activities is presented, highlighting recent progress.

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Overview of recent developments in pellet injection for ITER

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