Variation of ignition requirements and. alpha. parameters with density profile shapes in a tokamak Metadata

Title

• Main Title Variation of ignition requirements and. alpha. parameters with density profile shapes in a tokamak

Creator

• Author: Budny, R.
  Creator Type: Personal
• Author: McCune, D.
  Creator Type: Personal
• Author: Zweben, S. J.
  Creator Type: Personal
  Creator Info: Princeton Univ., NJ (United States). Plasma Physics Lab.
• Author: Sabbagh, S. A.
  Creator Type: Personal
  Creator Info: Columbia Univ., New York, NY (United States)

Contributor

• Sponsor: United States. Department of Energy.
  Contributor Type: Organization
  Contributor Info: DOE; USDOE, Washington, DC (United States)

Publisher

• Name: Princeton University. Plasma Physics Laboratory.
  Place of Publication: New Jersey
  Additional Info: Princeton Univ., NJ (United States). Plasma Physics Lab.

Date

• Creation: 1992-01-01

Language

• English

Description

• Content Description: We study consequences of variations of the electron density profiles in a hypothetical tokamak that achieves a steady state DT neutron emission rate of 10{sup 20}/sec. The TRNASP plasma analysis code calculates heating profiles and parameters of the fast {alpha} particles. These include profiles of the {alpha} density, average energy, slowing down time, heating of electrons and ions, and {beta}{sub {alpha}}. The energy confinement time would have to be 2.7--3.1 times the L-mode scaling values for {alpha} heated ignition, with the lower ratios corresponding to the more peaked density profiles. The required energy transport coefficients are compared with those measured in the core of TFTR supershots. For NBI fueled ignition, we postulate 40 MW NBI injected at 110 keV. The profiles of the NBI fueling rates for D{sup +} and T{sup +} are greater than the DT burnup rates. The requirements for the ratio of the energy confinement times to the L-mode values are in the range of 2.0--2.5, again with the lower ratios corresponding to the more peaked density profiles. We discuss the ideal MHD stability of the simulations. The calculated {Beta}{sub norm} varies from 3.1--3.7, with the low values corresponding to the peaked profiles. We use the PEST code to analyze the low-n stability and the STABAL code to analyze the Mercier and high-n ballooning stability. The central q{sub MHD} for the simulations is low (<1), and they are unstable to the Mercier criterion, so we assume that sawteeth or current profile control would increase the values to near 1.0. Then the plasma with the most broad profile is stable if a conducting wall is placed 0.45 m outside the plasma boundary.
• Physical Description: 32 pages

Subject

• Keyword: Mhd Equilibrium
• Keyword: Heating
• Keyword: Charged Particles
• Keyword: Temperature Distribution
• Keyword: Beam Injection Heating
• STI Subject Categories: 70 Plasma Physics And Fusion Technology
• Keyword: Tftr Tokamak
• Keyword: Confinement Time
• Keyword: Electron Density
• Keyword: Tokamak Devices 700310* -- Plasma Confinement-- (1992-)
• Keyword: Energy Balance
• Keyword: Thermonuclear Ignition
• Keyword: Thermonuclear Devices
• Keyword: Plasma Heating
• Keyword: Equilibrium
• Keyword: Closed Plasma Devices
• Keyword: Alpha Particles

Source

• Conference: International Sherwood fusion theory conference, Santa Fe, NM (United States), 6-8 Apr 1992

Collection

• Name: Office of Scientific & Technical Information Technical Reports
  Code: OSTI

Institution

• Name: UNT Libraries Government Documents Department
  Code: UNTGD

Resource Type

• Article

Format

• Text

Identifier

• Other: DE92012673
• Report No.: PPPL-CFP-2603
• Report No.: CONF-920419--1
• Grant Number: AC02-76CH03073
• Office of Scientific & Technical Information Report Number: 5361779
• Archival Resource Key: ark:/67531/metadc1074480

Note

• Display Note: OSTI; NTIS; INIS; GPO Dep.