Application of divertor cryopumping to H-mode density control in DIII-D

Author

Mahdavi, M.A. ; Ferron, J.R. ; Hyatt, A.W. ; La Haye, R.J. ; Laughon, G.L. ; Leh, M. ; Schaubel, K.M. ; Schaffer, M.J. ; Schissel, D.P. ; Scoville, J.T. ; Smith, J.P. ; Stambaugh, R.D. ; Maingi, R. ; Menon, M.M. ; Mioduszewski, P.K. ; Wade, M.

Author_Institution

Gen. Atomics, San Diego, CA, USA

Volume

2

fYear

1993

fDate

11-15 Oct 1993

Firstpage

597

Abstract

In this paper we describe the method and the results of experiments where a unique in-vessel cryopump-baffle system was used to control density of H-mode plasmas. We were able to independently regulate current and density of ELMing H-mode plasmas, each over a range of factor two, end measure the H-mode confinement scaling with plasma density and current. With a modest pumping speed of ≈40 kl/s, particle exhaust rates as high as 2×10²² atom/s^-1 have been observed

Keywords

Tokamak devices; cryopumping; fusion reactor operation; plasma density; plasma instability; DIII-D; ELMing H-mode plasmas; H-mode confinement scaling; H-mode density control; H-mode plasmas; divertor cryopumping; in-vessel cryopump-baffle system; particle exhaust rates; pumping speed; Control systems; Electrodes; Helium; Impurities; Plasma confinement; Plasma density; Plasma devices; Plasma measurements; Plasma transport processes; Tokamaks;

fLanguage

English

Publisher

ieee

Conference_Titel

Fusion Engineering, 1993., 15th IEEE/NPSS Symposium on

Conference_Location

Hyannis, MA

Print_ISBN

0-7803-1412-3

Type

conf

DOI

10.1109/FUSION.1993.518403

Filename

518403