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Steady State versus Pulsed Tokamak DEMO

Abstract

Full text: The present report deals with a Review of problems for a Steady state(SS) DEMO, related argument is treated about the models and the present status of comparison between the characteristics of DEMO pulsed versus a Steady state device.The studied SS DEMO Models (SLIM CS, PPCS model C EU-DEMO, ARIES-RS) are analyzed from the point of view of the similarity scaling laws and critical issues for a steady state DEMO. A comparison between steady state and pulsed DEMO is therefore carried out: in this context a new set of parameters for a pulsed (6 - 8 hours pulse) DEMO is determined working below the density limit, peak temperature of 20 keV, and requiring a modest improvement in the confinement factor(H{sub IPBy2} = 1.1) with respect to the H-mode. Both parameters density and confinement parameter are lower than the DEMO models presently considered. The concept of partially non-inductive pulsed DEMO is introduced since a pulsed DEMO needs heating and current drive tools for plasma stability and burn control. The change of the main parameter design for a DEMO working at high plasma peak temperatures T{sub e} {approx} 35 keV is analyzed: in this range the reactivity increases linearly with temperature,  More>>
Authors:
Orsitto, F.P., E-mail: francesco.orsitto@enea.it; [1]  Todd, T. [2] 
  1. Associazione EURATOM-ENEA Unita Tecnica Fusione, Frascati (Italy)
  2. CCFE/Fusion Association, Culham Science Centre, Abingdon (United Kingdom)
Publication Date:
Sep 15, 2012
Product Type:
Conference
Report Number:
IAEA-CN-197; FTP/P7-30
Resource Relation:
Conference: FEC 2012: 24. IAEA Fusion Energy Conference, San Diego, CA (United States), 8-13 Oct 2012; Related Information: In: 24. IAEA Fusion Energy Conference. Programme and Book of Abstracts| 789 p.
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; BURNS; COMPARATIVE EVALUATIONS; DENSITY; EFFICIENCY; FATIGUE; HEATING LOAD; H-MODE PLASMA CONFINEMENT; KEV RANGE 10-100; PLASMA; PULSES; SCALING LAWS; STEADY-STATE CONDITIONS; SYNCHROTRON RADIATION; TEMPERATURE RANGE 0400-1000 K; TOKAMAK DEVICES
OSTI ID:
22192634
Research Organizations:
International Atomic Energy Agency, Vienna (Austria)
Country of Origin:
IAEA
Language:
English
Other Identifying Numbers:
TRN: XA14S0044017123
Availability:
Available from INIS in electronic form. Also available on-line: http://www-pub.iaea.org/MTCD/Meetings/PDFplus/2012/cn197/cn197_Programme.pdf
Submitting Site:
INIS
Size:
page(s) 501
Announcement Date:
Feb 20, 2014

Citation Formats

Orsitto, F.P., E-mail: francesco.orsitto@enea.it, and Todd, T. Steady State versus Pulsed Tokamak DEMO. IAEA: N. p., 2012. Web.
Orsitto, F.P., E-mail: francesco.orsitto@enea.it, & Todd, T. Steady State versus Pulsed Tokamak DEMO. IAEA.
Orsitto, F.P., E-mail: francesco.orsitto@enea.it, and Todd, T. 2012. "Steady State versus Pulsed Tokamak DEMO." IAEA.
@misc{etde_22192634,
title = {Steady State versus Pulsed Tokamak DEMO}
author = {Orsitto, F.P., E-mail: francesco.orsitto@enea.it, and Todd, T.}
abstractNote = {Full text: The present report deals with a Review of problems for a Steady state(SS) DEMO, related argument is treated about the models and the present status of comparison between the characteristics of DEMO pulsed versus a Steady state device.The studied SS DEMO Models (SLIM CS, PPCS model C EU-DEMO, ARIES-RS) are analyzed from the point of view of the similarity scaling laws and critical issues for a steady state DEMO. A comparison between steady state and pulsed DEMO is therefore carried out: in this context a new set of parameters for a pulsed (6 - 8 hours pulse) DEMO is determined working below the density limit, peak temperature of 20 keV, and requiring a modest improvement in the confinement factor(H{sub IPBy2} = 1.1) with respect to the H-mode. Both parameters density and confinement parameter are lower than the DEMO models presently considered. The concept of partially non-inductive pulsed DEMO is introduced since a pulsed DEMO needs heating and current drive tools for plasma stability and burn control. The change of the main parameter design for a DEMO working at high plasma peak temperatures T{sub e} {approx} 35 keV is analyzed: in this range the reactivity increases linearly with temperature, and a device with smaller major radius (R = 7.5 m) is compatible with high temperature. Increasing temperature is beneficial for current drive efficiency and heat load on divertor, being the synchrotron radiation one of the relevant components of the plasma emission at high temperatures and current drive efficiency increases with temperature. Technology and engineering problems are examined including efficiency and availability R&D issues for a high temperature DEMO. Fatigue and creep-fatigue effects of pulsed operations on pulsed DEMO components are considered in outline to define the R&D needed for DEMO development. (author)}
place = {IAEA}
year = {2012}
month = {Sep}
}