TITLE

Diamagnetic loop measurement in Korea Superconducting Tokamak Advanced Research machine

AUTHOR(S)
Bak, J. G.; Lee, S. G.; Kim, H. S.
PUB. DATE
June 2011
SOURCE
Review of Scientific Instruments;Jun2011, Vol. 82 Issue 6, p063504
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Diamagnetic loop (DL), which consists of two poloidal loops inside the vacuum vessel, is used to measure the diamagnetic flux during a plasma discharge in the Korea Superconducting Tokamak Advanced Research (KSTAR) machine. The vacuum fluxes in the DL signal can be compensated up to 0.1 mWb by using the coefficients, which are obtained from experimental investigations, in the vacuum flux measurements during vacuum shots under same operational conditions of magnetic coils for plasma experiment in the KSTAR machine. The maximum error in the diamagnetic flux measurement due to the errors of the coefficients was estimated as ∼0.22 mWb. From the diamagnetic flux measurements for the ohmically heated circular plasmas in the KSTAR machine, the stored energy agrees well with the estimated kinetic energy within the discrepancy of 25%. When the electron cyclotron heating, the neutral beam injection, and the ion cyclotron resonance heating are added to the ohmically heated limiter plasmas, the additional heating effects can be clearly observed from the increase of the stored energy evaluated in the DL measurement.
ACCESSION #
62010847

 

Related Articles

  • Ion flux measurements with the improved collector probe system at the TEXTOR-94 tokamak Larsson, D.; Rubel, M. // Review of Scientific Instruments;Jul98, Vol. 69 Issue 7, p2671 

    Develops a collector probe system at the TEXTOR-94 tokamak for the ion flux measurements. Basis of the system on the LabView environment; Possibility of such measurements in a selected part of a tokamak discharge; Efficacy of the tool for studies on erosion and deposition processes.

  • Analysis of uncertainty in equilibrium reconstruction in the EAST superconducting tokamak. Liu, G. J.; Wan, B. N.; Sun, Y. W.; Xiao, B. J.; Wang, Y.; Luo, Zh. P.; Qian, J. P.; Liu, D. M. // Review of Scientific Instruments;Jul2013, Vol. 84 Issue 7, p073502 

    The analysis of uncertainties of magnetic measurements in equilibrium reconstruction is carried out on the EAST (Experimental Advanced Superconducting Tokamak) tokamak. It is shown that uncertainties of magnetic diagnostics are about 0.2% and 10 mWb for flux loops and 0.6% and 20 G for magnetic...

  • Start-up of Spherical Tokamak by ECH on LATE. Maekawa, T.; Tanaka, H.; Uchida, M.; Igami, H.; Yoshinaga, T.; Higaki, K. // AIP Conference Proceedings;2003, Vol. 694 Issue 1, p340 

    (1) Physical process of initial formation of closed flux surface has been studied under the condition of steady external vertical fields by using a 2.45 GHz magnetron (5kW). After the injection of microwave power the plasma current increases gradually until up to 0.4 kA. Once the current reaches...

  • A Simple Coaxial Ceramic Based Vacuum Window for Vacuum Transmission Line of ICRF System. Rathi, D.; Mishra, K.; Goerge, S.; Varia, A.; Kulkarni, S. V. // AIP Conference Proceedings;12/23/2011, Vol. 1406 Issue 1, p109 

    We present here a simple coaxial RF vacuum window designed for 200 kW power without any design complicacy and is simple to fabricate. It is achieved by sandwiching a UHV grade ceramic disk in between inner and outer straight conductors. The window has been designed and fabricated for use in the...

  • Superconducting Wire Network under Spatially Modulated Magnetic Field. Sano, Hirotaka; Endo, Akira; Katsumoto, Shingo; Iye, Yasuhiro // AIP Conference Proceedings;2006, Vol. 850 Issue 1, p747 

    A two-dimensional (2D) superconducting square network under spatially modulated magnetic field is studied. The super/normal phase boundaries were measured with field modulation varied. The dependence on the strength of field modulation exhibited the behavior reproducing the calculation we had...

  • Trapped Field Profiles for 40-mm Wide Superconducting Tape Pieces. Patel, A.; Usoskin, A.; Baskys, A.; Hopkins, S.; Glowacki, B. // Journal of Superconductivity & Novel Magnetism;Feb2015, Vol. 28 Issue 2, p397 

    Stacks of superconducting tape can be magnetized to form a new type of permanent magnet due to their ability to circulate persistent currents. Previous work has mostly focussed on magnetization of smaller stacks made of 12-mm tape, but this study reports the trapped field from both field cooling...

  • The perpendicular electron energy flux driven by magnetic fluctuations in the edge of the Texas... Fiksel, G.; Bengtson, Roger D. // Physics of Plasmas;Dec95, Vol. 2 Issue 12, p4586 

    Discusses the use of a bolometer to direct measurements of parallel electron energy flux in the edge of the Texas Experimental Tokamak. Link between the magnetic fluctuations and cross magnetic field energy transport; Mechanisms for the anomalous large edge conducted by energy flux across the...

  • Magnetic flux evolution in highly shaped plasmas. Strand, P. I.; Houlberg, W. A. // Physics of Plasmas;Jun2001, Vol. 8 Issue 6, p2782 

    The resistive evolution of magnetic flux in toroidal devices is studied. The formulation is applicable to general nonaxisymmetric (three-dimensional) toroidal configurations. In particular, it can treat highly shaped, high β, three-dimensional stellarator configurations, as well as...

  • Magneto-optical imaging of flux patterns in multifilamentary.... Welp, U.; Gunter, D.O. // Applied Physics Letters;3/6/1995, Vol. 66 Issue 10, p1270 

    Examines the superconducting morphology in (BiPb)[sub 2]Ca[sub 2]Cu[sub 3]O[sub x] (Bi-2233) composite conductor. Use of magneto-optical imaging in the magnetic flux patterns of conductors; Effects of temperature on Bi-2233 composites; Impact of misaligned Bi-2233 grain colonies on...

Share

Read the Article

Courtesy of VIRGINIA BEACH PUBLIC LIBRARY AND SYSTEM

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

Try another library?
Sign out of this library

Other Topics