New ORNL Pellet Injection System and Installation/Initial Operations on MST

Journal Article · Mon Sep 15 00:00:00 EDT 2003 · Fusion Science and Technology

OSTI ID:20849567

Combs, S K ^[1]; Baylor, L R ^[1]; Fehling, D T ^[1]; Fisher, P W ^[1]; Foust, C R ^[1]; Rasmussen, D A ^[1]; Wilgen, J B ^[1]; Chapman, B E ^[2]; Oliva, S P ^[2]; Prager, S C ^[2]; Sarff, J S ^[2]; Wyman, M D ^[2]; Brower, D L ^[3]; Ding, W X ^[3]; Terry, S D ^[3]; Deng, B H ^[3]

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1. Oak Ridge National Laboratory (United States)
2. University of Wisconsin-Madison (United States)
3. University of California-Los Angeles (United States)

A compact pellet injection system that was recently developed at the Oak Ridge National Laboratory has been installed on the Madison Symmetric Torus (MST) at University of Wisconsin and used in initial plasma fueling experiments. The system, referred to as a ''pellet injector in a suitcase,'' is a pipe gun device with a four-barrel capability (presently equipped with two 1.0-mm-bore barrels), and it uses a cryogenic refrigerator for in-situ hydrogen pellet formation (typically, D{sub 2} pellets). This new, portable, stand-alone pellet injection system was developed to provide a flexible means of plasma fueling on a wide variety of magnetic confinement devices, with relatively low costs for installation and operation. The injector has already been used to produce useful results with pellets on MST plasmas, including significant and rapid increases (almost 100%) in the line average density, and effectively depositing fuel in the plasma core (central densities of [approximately equal to] 1.4 x 10{sup 19} m{sup -3}). In this paper, the injection system, its performance, and reliability will be described, and results from some initial MST pellet experiments will be highlighted.

• OSTI ID: 20849567
• Journal Information: Fusion Science and Technology, Vol. 44, Issue 2; Other Information: Copyright (c) 2006 American Nuclear Society (ANS), United States, All rights reserved. http://epubs.ans.org/; Country of input: International Atomic Energy Agency (IAEA); ISSN 1536-1055
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
FUEL PELLETS
HYDROGEN
MAGNETIC CONFINEMENT
MST DEVICE
ORNL
PELLET INJECTION
PERFORMANCE
PLASMA
PLASMA DENSITY