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Title: Vacuum System and Modeling for the Materials Plasma Exposure Experiment

Abstract

Understanding the science of plasma-material interactions (PMI) is essential for the future development of fusion facilities. The design of divertors and first walls for the next generation of long-pulse fusion facilities, such as a Fusion Nuclear Science Facility (FNSF) or a DEMO, requires significant PMI research and development. In order to meet this need, a new linear plasma facility, the Materials Plasma Exposure Experiment (MPEX) is proposed, which will produce divertor relevant plasma conditions for these next generation facilities. The device will be capable of handling low activation irradiated samples and be able to remove and replace samples without breaking vacuum. A Target Exchange Chamber (TEC) which can be disconnected from the high field environment in order to perform in-situ diagnostics is planned for the facility as well. The vacuum system for MPEX must be carefully designed in order to meet the requirements of the different heating systems, and to provide conditions at the target similar to those expected in a divertor. An automated coupling-decoupling (“autocoupler”) system is designed to create a high vacuum seal, and will allow the TEC to be disconnected without breaking vacuum in either the TEC or the primary plasma materials interaction chamber. This autocoupler, whichmore » can be actuated remotely in the presence of the high magnetic fields, has been designed and prototyped, and shows robustness in a variety of conditions. The vacuum system has been modeled using a simplified finite element analysis, and indicates that the design goals for the pressures in key regions of the facility are achievable.« less

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1399921
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Fusion Science and Technology
Additional Journal Information:
Journal Volume: 72; Journal Issue: 4; Journal ID: ISSN 1536-1055
Publisher:
American Nuclear Society
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Lumsdaine, Arnold, Meitner, Steve, Graves, Van, Bradley, Craig, Stone, Chris, Lessard, Timothy, McGinnis, Dean, Rapp, Juergen, Bjorholm, Tom, Duckworth, Robert, and Varma, Venugopal. Vacuum System and Modeling for the Materials Plasma Exposure Experiment. United States: N. p., 2017. Web. doi:10.1080/15361055.2017.1347466.
Lumsdaine, Arnold, Meitner, Steve, Graves, Van, Bradley, Craig, Stone, Chris, Lessard, Timothy, McGinnis, Dean, Rapp, Juergen, Bjorholm, Tom, Duckworth, Robert, & Varma, Venugopal. Vacuum System and Modeling for the Materials Plasma Exposure Experiment. United States. doi:10.1080/15361055.2017.1347466.
Lumsdaine, Arnold, Meitner, Steve, Graves, Van, Bradley, Craig, Stone, Chris, Lessard, Timothy, McGinnis, Dean, Rapp, Juergen, Bjorholm, Tom, Duckworth, Robert, and Varma, Venugopal. Mon . "Vacuum System and Modeling for the Materials Plasma Exposure Experiment". United States. doi:10.1080/15361055.2017.1347466. https://www.osti.gov/servlets/purl/1399921.
@article{osti_1399921,
title = {Vacuum System and Modeling for the Materials Plasma Exposure Experiment},
author = {Lumsdaine, Arnold and Meitner, Steve and Graves, Van and Bradley, Craig and Stone, Chris and Lessard, Timothy and McGinnis, Dean and Rapp, Juergen and Bjorholm, Tom and Duckworth, Robert and Varma, Venugopal},
abstractNote = {Understanding the science of plasma-material interactions (PMI) is essential for the future development of fusion facilities. The design of divertors and first walls for the next generation of long-pulse fusion facilities, such as a Fusion Nuclear Science Facility (FNSF) or a DEMO, requires significant PMI research and development. In order to meet this need, a new linear plasma facility, the Materials Plasma Exposure Experiment (MPEX) is proposed, which will produce divertor relevant plasma conditions for these next generation facilities. The device will be capable of handling low activation irradiated samples and be able to remove and replace samples without breaking vacuum. A Target Exchange Chamber (TEC) which can be disconnected from the high field environment in order to perform in-situ diagnostics is planned for the facility as well. The vacuum system for MPEX must be carefully designed in order to meet the requirements of the different heating systems, and to provide conditions at the target similar to those expected in a divertor. An automated coupling-decoupling (“autocoupler”) system is designed to create a high vacuum seal, and will allow the TEC to be disconnected without breaking vacuum in either the TEC or the primary plasma materials interaction chamber. This autocoupler, which can be actuated remotely in the presence of the high magnetic fields, has been designed and prototyped, and shows robustness in a variety of conditions. The vacuum system has been modeled using a simplified finite element analysis, and indicates that the design goals for the pressures in key regions of the facility are achievable.},
doi = {10.1080/15361055.2017.1347466},
journal = {Fusion Science and Technology},
number = 4,
volume = 72,
place = {United States},
year = {Mon Aug 07 00:00:00 EDT 2017},
month = {Mon Aug 07 00:00:00 EDT 2017}
}

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