Skip to Main content Skip to Navigation
Conference papers

1 µs broadband frequency sweeping reflectometry for plasma density and fluctuation profile measurements

Abstract : Frequency swept reflectometry has reached the symbolic value of 1 µs sweeping time, this performance has been made possible due to an improved control of the ramp voltage driving the frequency source. In parallel, the memory depth of the 1 Gs/s acquisition system has been upgraded and can provide up to 200 000 density profiles during a plasma discharge. Additionally, improvements regarding the trigger delay determination for the acquisition, which needs to be precisely set and the frequency sweep linearity required by this ultra-fast technique along with the stability of the ramp voltage driving the VCOs, have been made. While this diagnostic is traditionally dedicated to the density profile measurement, such a fast sweeping rate can provide the study of fast plasma events and turbulence with unprecedented time and radial resolution from the edge to the core and thus compete with the fixed frequency systems. Experimental results obtained on ASDEX Upgrade plasmas will be presented to demonstrate the performances of the diagnostic.
Document type :
Conference papers
Complete list of metadatas

https://hal-cea.archives-ouvertes.fr/cea-02289203
Contributor : Valerie Icard <>
Submitted on : Monday, September 16, 2019 - 1:59:28 PM
Last modification on : Tuesday, September 17, 2019 - 1:20:13 AM
Long-term archiving on: : Saturday, February 8, 2020 - 11:01:50 AM

File

CLairet - IRW abstract (Lausan...
Files produced by the author(s)

Identifiers

  • HAL Id : cea-02289203, version 1

Collections

Citation

F. Clairet, C. Bottereau, A. Medvedeva, D. Molina, G. Conway, et al.. 1 µs broadband frequency sweeping reflectometry for plasma density and fluctuation profile measurements. 14th International reflectometry workshop, May 2019, Lausanne, Switzerland. pp.1453 - 1454. ⟨cea-02289203⟩

Share

Metrics

Record views

53

Files downloads

14