Combination of multichannel detection and fast time response in a multichord spectrometer

A high resolution spectrometer has been used to measure simultaneously plasma impurity ion temperatures and rotational velocities, with submillisecond temporal resolution. The dual requirements of detailed spectral detection and fast time response are satisfied by having two detection systems viewin...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Veröffentlicht in:Review of Scientific Instruments 1992-10, Vol.63 (10), p.4962-4964
Hauptverfasser: Bamford, R. A., Carolan, P. G., Bunting, C. A.
Format: Artikel
Sprache:eng
Schlagworte:
Online-Zugang:Volltext
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
Zusammenfassung:A high resolution spectrometer has been used to measure simultaneously plasma impurity ion temperatures and rotational velocities, with submillisecond temporal resolution. The dual requirements of detailed spectral detection and fast time response are satisfied by having two detection systems viewing the same dispersed spectrum. The first is a multichannel system (e.g., a two‐dimensional charge coupled device camera, for multichord detection) and the other an assembly comprising of three photomultipliers. A matched double spectrometer (f=1.26 m) is used to disperse the spectrum and giving an overall inverse dispersion of 0.04 nm/mm. The dispersive power is about 20× greater than the more conventional systems and has a corresponding increase in etendu, or light throughput, for the same resolution. The combination has been successfully used for magnetohydrodynamics mode locking experiments on COMPASS‐C tokamak where velocity shifts of ∼30 km−1 were measured to an accuracy of ∼1 km s−1 with a 40 μs time resolution.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.1143512