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Title: Structural design of the DIII-D radiative divertor

Abstract

The divertor of the DIII-D tokamak is being modified to operate as a slot type, dissipative divertor. This modification, called the Radiative Divertor Program (RDP) is being carried out in two phases. The design and analysis is complete and hardware is being fabricated for the first phase. This first phase consists of an upper divertor baffle and cryopump to provide some density control for high triangularity, single or double null discharges. Installation of the first phase is scheduled to start in October, 1996. The second phase provides pumping at all four divertor strike points of double null high triangularity discharges and baffling of the neutral particles from transport back to the core plasma. Studies of the effects of varying the slot length and width of the divertor can be easily accomplished with the design of RDP hardware. Static and dynamic analyses of the baffle structures, new cryopumps, and feedlines were performed during the preliminary and final design phases. Disruption loads and differential thermal displacements must be accommodated in the design of these components. With the full RDP hardware installed, the plasma current in DIII-D will be a maximum of 3.0 MA. Plasma disruptions induce toroidal currents in the cryopump, producingmore » complex dynamic loads. Simultaneously, the vacuum vessel vibrations impose a sinusoidal base excitation to the supports for the cryopump. Static and dynamic analyses of the cryopump demonstrate that the stresses due to disruption and thermal loadings satisfy the stress and deflection criteria.« less

Authors:
; ; ; ; ; ; ;
Publication Date:
Research Org.:
General Atomics, San Diego, CA (United States)
Sponsoring Org.:
USDOE Office of Energy Research, Washington, DC (United States)
OSTI Identifier:
442209
Report Number(s):
GA-A22445; CONF-960944-11
ON: DE97003327; TRN: 97:009790
DOE Contract Number:  
AC03-89ER51114
Resource Type:
Conference
Resource Relation:
Conference: SOFT `96: 19. symposium on fusion technology, Lisbon (Portugal), 16-20 Sep 1996; Other Information: PBD: Oct 1996
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION; DOUBLET-3 DEVICE; DIVERTORS; DESIGN; CRYOPUMPS; PLASMA DENSITY; PLASMA IMPURITIES; BAFFLES; GRAPHITE; STRESS ANALYSIS

Citation Formats

Reis, E E, Smith, J P, Baxi, C B, Bozek, A S, Chin, E, Hollerbach, M A, Laughon, G J, and Sevier, D L. Structural design of the DIII-D radiative divertor. United States: N. p., 1996. Web.
Reis, E E, Smith, J P, Baxi, C B, Bozek, A S, Chin, E, Hollerbach, M A, Laughon, G J, & Sevier, D L. Structural design of the DIII-D radiative divertor. United States.
Reis, E E, Smith, J P, Baxi, C B, Bozek, A S, Chin, E, Hollerbach, M A, Laughon, G J, and Sevier, D L. 1996. "Structural design of the DIII-D radiative divertor". United States. https://www.osti.gov/servlets/purl/442209.
@article{osti_442209,
title = {Structural design of the DIII-D radiative divertor},
author = {Reis, E E and Smith, J P and Baxi, C B and Bozek, A S and Chin, E and Hollerbach, M A and Laughon, G J and Sevier, D L},
abstractNote = {The divertor of the DIII-D tokamak is being modified to operate as a slot type, dissipative divertor. This modification, called the Radiative Divertor Program (RDP) is being carried out in two phases. The design and analysis is complete and hardware is being fabricated for the first phase. This first phase consists of an upper divertor baffle and cryopump to provide some density control for high triangularity, single or double null discharges. Installation of the first phase is scheduled to start in October, 1996. The second phase provides pumping at all four divertor strike points of double null high triangularity discharges and baffling of the neutral particles from transport back to the core plasma. Studies of the effects of varying the slot length and width of the divertor can be easily accomplished with the design of RDP hardware. Static and dynamic analyses of the baffle structures, new cryopumps, and feedlines were performed during the preliminary and final design phases. Disruption loads and differential thermal displacements must be accommodated in the design of these components. With the full RDP hardware installed, the plasma current in DIII-D will be a maximum of 3.0 MA. Plasma disruptions induce toroidal currents in the cryopump, producing complex dynamic loads. Simultaneously, the vacuum vessel vibrations impose a sinusoidal base excitation to the supports for the cryopump. Static and dynamic analyses of the cryopump demonstrate that the stresses due to disruption and thermal loadings satisfy the stress and deflection criteria.},
doi = {},
url = {https://www.osti.gov/biblio/442209}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1996},
month = {10}
}

Conference:
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