Author: G. SchillingPublisher:
ISBN:
Category :
Languages : en
Pages : 16
Book Description
Neutral Beam Injection on the PLT Tokamak
Author: G. SchillingIon Transport Studies on the PLT Tokamak During Neutral Beam Injection
Author: S. SuckewerToroidal Plasma Rotation in the PLT Tokamak with Neutral Beam Injection
Author: S. SuckewerPLT Neutral Beam Heating Results
Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Experimental results from high-power neutral beam injection experiments on the PLT (Princeton Large Torus) tokamak are reported. At the highest beam powers (2.1 MW) and lowest plasma densities (n/sub e/(O) = 4.5 x 10−13 cm−3), ion temperatures of 5.5 keV are achieved. The ion collisionality .nu.*/sub i/ drops below 0.1 over much of the radial profile. Electron heating of .delta. T/sub e//T/sub e/ approx. = 50% has also been observed, consistent with the gross energy confinement time of the ohmically heated plasma, but indicative of enhanced electron energy confinement in the core of the plasma.
Component Design Description of the Neutral Beam Injectors for PLT.
Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Plasma heating by injection of high energy neutrals is one of the experiments to be carried out on Princeton Large Torus (PLT). A four unit neutral beam injection system has been designed, built and tested which should inject a total of 3 MW of neutrals into PLT with a 200 millisecond pulse length. A typical system unit is described where the major components are identified. The following discussion describes each of these items along with some details of the design and fabrication problems encountered. Some early design considerations addressed the problems of separation and dumping of residual ions from the neutral beam, calorimetry of the neutrals with incident fuxes of 25 KW/cm2, and pumping speeds of several hundred thousand liters per second for hydrogen gas. Solutions were found for these problems while also resolving the complex dilemma of interfacing four large systems to a tokamak.
Heating Efficiency of High-power Perpendicular Neutral-beam Injection in PDX.
Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
The heating efficiency of high power (up to 7.2 MW) near-perpendicular neutral beam injection in the PDX tokamak is comparable to that of tangential injection in PLT. Collisionless plasmas with central ion temperatures up to 6.5 keV and central electron temperatures greater than 2.5 keV have been obtained. The plasma pressure, including the contribution from the beam particles, increases with increasing beam power and does not appear to saturate, although the parametric dependence of the energy confinement time is different from that observed in ohmic discharges.
Neutral Beam Injection Into a Tokamak
Author: Initial Operation and Performance of the PDX Neutral-beam Injection System
Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
In 1981, the joint ORNL/PPPL PDX neutral beam heating project succeeded in reliably injecting 7.2 MW of D° into the PDX plasma, at nearly perpendicular angles, and achieved ion temperatures up to 6.5 keV. The expeditious achievement of this result was due to the thorough conditioning and qualification of the PDX neutral beam ion sources at ORNL prior to delivery coupled with several field design changes and improvements in the injection system made at PPPL as a result of neutral beam operating experience with the PLT tokamak. It has been found that the operation of high power neutral beam injection systems in a tokamak-neutral beam environment requires procedures and performance different from those required for development operation on test stands. In this paper, we review the installatin of the PDX neutral beam injection system, and its operation and performance during the initial high power plasma heating experiments with the PDX tokamak.
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