TITLE

Performance of the Tokamak Fusion Test Reactor bolometers

AUTHOR(S)
Schivell, J.
PUB. DATE
May 1985
SOURCE
Review of Scientific Instruments;May85, Vol. 56 Issue 5, p972
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
For the past year we have been making use of a horizontally viewing 19-channel array and a bolometer which views a narrow cross-sectional slice of the plasma. More recently, we have also obtained results from a second, vertically viewing array. Software has been developed to translate the data from general plasma and array locations to plasma minor radius and to do the Abel inversion with an antisymmetrical term included. Experience has been obtained on the noise and response-time characteristics, as well as the accuracy of total radiated power and radial profiles. Representative cases of radiated power profiles and local power balance are presented, as well as comparisons with other measurements of impurity concentration and trends with electron density and limiter coating. Although most of the ohmic-heating input power leaves by radiation, most of this loss occurs near the outer part of the plasma. Also, the behavior of power profiles during neutral beam injection is discussed briefly.
ACCESSION #
9785390

 

Related Articles

  • Structure of Global Tokamak Scalings. Dnestrovskij, Yu. N. // Plasma Physics Reports;Feb2002, Vol. 28 Issue 2, p166 

    In empirical tokamak scalings, not all of the standard engineering parameters are independent. Thus, the larger the tokamak, the higher the required plasma current and input power. Also, by using higher magnetic fields, it is possible to raise the plasma density. Instead of the plasma density,...

  • High-Q plasmas in the TFTR tokamak. Jassby, D. L.; Barnes, C. W.; Bell, M. G.; Bitter, M.; Boivin, R.; Bretz, N. L.; Budny, R. V.; Bush, C. E.; Dylla, H. F.; Efthimion, P. C.; Fredrickson, E. D.; Hawryluk, R. J.; Hill, K. W.; Hosea, J.; Hsuan, H.; Janos, A. C.; Jobes, F. C.; Johnson, D. W.; Johnson, L. C. // Physics of Fluids B: Plasma Physics;Aug91, Vol. 3 Issue 8, p2308 

    In the Tokamak Fusion Test Reactor (TFTR) [Plasma Phys. Controlled Fusion 26, 11 (1984) ], the highest neutron source strength S[sub n] and D-D fusion power gain Q[sub DD] are realized in the neutral-beam-fueled and heated "supershot" regime that occurs after extensive wall conditioning to...

  • Sawtooth studies with q-profile measurement on TFTR(abstract)[sup a]. Levinton, F.M.; Batha, S.H.; Yamada, M.; Zakharov, L.; Zarntorff, M.C. // Review of Scientific Instruments;Jan1995, Vol. 66 Issue 1, p372 

    Measures the q profile for plasma equilibrium and theories of MHD instabilities in a Tokamak Fusion Test Reactor (TFTR). Measurement of diagnostic and accurate profiles.

  • Multichannel bolometer for radiation measurements on the TCA tokamak. Joye, B.; Marmillod, Ph.; Nowak, S. // Review of Scientific Instruments;Oct86, Vol. 57 Issue 10, p2449 

    A multichannel radiation bolometer has been developed for the Tokamak Chauffage Alfvén (TCA) tokamak. It has 16 equally spaced chords that view the plasma through a narrow horizontal slit. Almost an entire vertical plasma cross section can be observed. The bolometer operates on the basis of a...

  • Operation of a multichannel tangential bolometer on PBX. Paul, S. F.; Fonck, R. J.; Schmidt, G. L. // Review of Scientific Instruments;Aug1986, Vol. 57 Issue 8, p2099 

    A compact 15-channel bolometer array that views plasma emission tangentially across the midplane has been installed on the PBX tokamak to supplement a 19-channel radially viewing poloidat array. By comparing these diagnostics, poloidal asymmetries in the emission profile can be determined. The...

  • Analysis of highly asymmetric radiation loss profiles in TFTR. Schivell, J.; Bush, C. E. // Review of Scientific Instruments;Aug1986, Vol. 57 Issue 8, p2081 

    The profiles are measured in the tokamak fusion test reactor (TFTR) with two bolometer arrays, one of which looks in at the plasma horizontally and one vertically. Under some conditions the profiles have large, localized features. The most common are a bright band of radiation near the inner...

  • Toroidal variation of power radiated from TFTR. Bush, C. E.; Schivell, J.; Medley, S. S.; Ulrickson, M. // Review of Scientific Instruments;Aug1986, Vol. 57 Issue 8, p2078 

    Botometers located at a number of toroidal and poloidal positions are used to determine the toroidal distribution of impurity radiation losses from the Tokamak Fusion Test Reactor (TFTR) plasmas. Distributions for both OH and beam-heated D[sup +] and He[sup ++] plasmas have been determined. The...

  • Experimental Studies of the Behavior of the Ion Plasma Component during Disruptive Instability in a Tokamak. Brevnov, N. N.; Gott, Yu. V.; Shurygin, V. A. // Plasma Physics Reports; 

    Results are presented from experimental studies of the behavior of the plasma ion component during disruptive instability in the TVD and DAMAVAND tokamaks. It is shown that the ion temperature increases during a major disruption by a factor of 1.5–2. The ions are accelerated predominantly...

  • Development of laser methods for diagnosing the surface state of the walls of the discharge chambers in tokamak facilities. Mukhin, E.; Kuteev, B.; Razdobarin, G.; Tolstyakov, S. // Instruments & Experimental Techniques;Mar2006, Vol. 49 Issue 2, p280 

    A method for diagnosing plasma-induced coating deposited on the walls of the discharge chambers in tokamak facilities is described. This method is based on the atomization of the laser-ablated thin layer of the material deposited on the wall and the determination of the amount of the evaporated...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics