Davis Millimeter-Wave Research Center

Microwave/Millimeter Wave Technology

Plasma Diagnostics

 

 

RESEARCH  ACTIVITIES

Plasma diagnostics

 

µ-wave vacuum electronics

 

µ-wave solid state technology

 

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Director:
Prof. N.C. Luhmann, Jr.

 

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ECE Imaging on KSTAR

 

The ECEI system on KSTAR is the 3rd generation of its kind and shares many similarities with the DIII-D installation (identical electronics and dual arrays fabricated by UCD for simultaneous low-field side and high-field side imaging). As of early 2012, the KSTAR ECEI system consists of a dual-array arrangement, where each imaging array consists of 24 poloidal channels each detecting 8 different frequencies for 192 channels per array and 384 channels total. Mid 2012, UCD provided KSTAR with a third ECEI array (24x8 channels) that will provide imaging at a toroidally-displaced view, allowing for quasi-3D measurements. System installation, operation, and maintenance are taken on by on-site personnel from POSTECH.

 

 

 

Above: Schematic of the dual-array ECEI system installed on KSTAR. The large aperture port cassette with vacuum window allows placement of the optics with close proximity to the plasma. Cooke triplet zoom lenses, designed jointly by UCD and POSTECH and fabricated by FOM Rijnhuizen, consists of three optical elements and provides enhanced vertical coverage (3:1 vertical zoom ratio).

 

 

 

Above: Two-array ECEI system located at Bay G and a third ECEI system located on Bay H. Allows ECEI to image Te fluctuations in 3 planes – radial, poloidal, toroidal.

 

High Field Imaging

   ECEI arrays modified (2012) with new antennas for high field (3.0-3.5 T) operation

Expanded Views

   ECEI systems to be updated with new frequency extenders which double the horizontal coverage of each array

   First extenders to be installed in 2012, with all three arrays equipped with extenders in 2013

 

 

 

 

 

 

 

 

    
 
 
 
 
 
 
 
 
 
 
 
 
              
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