Title :
Mechanical Design of the NSTX High-k Scattering Diagnostic
Author :
Feder, R. ; Mazzucato, E. ; Munsat, T. ; Park, H. ; Smith, D.R. ; Ellis, R. ; Labik, G. ; Priniski, C.
Author_Institution :
Plasma Phys. Lab., Princeton Univ., NJ
Abstract :
The NSTX high-k scattering diagnostic measures small-scale density fluctuations by the heterodyne detection of waves scattered from a millimeter wave probe beam at 280 GHz and lambda=1.07 mm. To enable this measurement, major alterations were made to the NSTX vacuum vessel and neutral beam armor. Close collaboration between the PPPL physics and engineering staff resulted in a flexible system with steerable launch and detection optics that can position the scattering volume either near the magnetic axis (rhoap.1) or near the edge (rhoap.8). 150 feet of carefully aligned corrugated waveguide was installed for injection of the probe beam and collection of the scattered signal into the detection electronics
Keywords :
fluctuations; fusion reactor design; fusion reactor materials; heterodyne detection; particle beam injection; waveguides; 280 GHz; NSTX high-k scattering diagnostic; NSTX vacuum vessel; carefully aligned corrugated waveguide; detection electronics; detection optics; heterodyne detection; injection; magnetic axis; mechanical design; millimeter wave probe beam; neutral beam armor; probe beam; scattered signal; scattering volume; small-scale density fluctuations; steerable launch; Collaboration; Density measurement; Fluctuations; High K dielectric materials; High-K gate dielectrics; Millimeter wave measurements; Optical scattering; Optical waveguides; Physics; Probes;
Conference_Titel :
Fusion Engineering 2005, Twenty-First IEEE/NPS Symposium on
Conference_Location :
Knoxville, TN
Print_ISBN :
0-4244-0150-X
Electronic_ISBN :
0-4244-0150-X
DOI :
10.1109/FUSION.2005.252971
