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Shattered pellet injection technology design and characterization for disruption mitigation experiments

Conference ·
 [1];  [1];  [1];  [1];  [1];  [1];  [1]
  1. ORNL
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The technology to form and shoot high-Z cryogenic solid pellets mixed with deuterium using a gas gun that are shattered upon injection into a plasma has been developed at Oak Ridge National Laboratory for mitigating disruptions. This technology has been selected as the basis for the baseline disruption mitigation system on ITER. The development of shattered pellet injection systems has progressed to be able to accelerate large pellets of pure argon and neon with or without including deuterium. Impact studies have been carried out at shallow angles to determine funnel performance in guiding pellets from multiple barrels into a common injection line and across pumping breaks. The characterization of the shattered spray has also progressed with fragment size measurements as a function of pellet speed showing a strong inverse relationship. Results of these studies are reported with implications for applications on existing and future tokamak devices.
Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC)
DOE Contract Number:
AC05-00OR22725
OSTI ID:
1542238
Country of Publication:
United States
Language:
English

References (8)

Disruptions in ITER and strategies for their control and mitigation journal August 2015
First demonstration of rapid shutdown using neon shattered pellet injection for thermal quench mitigation on DIII-D journal March 2016
A combined microwave cavity and photographic diagnostic for high‐speed projectiles journal August 1990
Pellet delivery and survivability through curved guide tubes for fusion fueling and its implications for ITER journal November 2005
Alternative Techniques for Injecting Massive Quantities of Gas for Plasma-Disruption Mitigation journal March 2010
Disruption Mitigation System Developments and Design for ITER journal September 2015
Solidification and Acceleration of Large Cryogenic Pellets Relevant for Plasma Disruption Mitigation journal September 2016
Thermal quench mitigation and current quench control by injection of mixed species shattered pellets in DIII-D journal June 2016

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