Title :
Upgraded ultrashort pulse reflectometry system on SSPX
Author :
Roh, Y. ; Domier, C.W. ; Luhmann, N.C., Jr.
Author_Institution :
Dept. of Appl. Sci., California Univ., Davis, CA, USA
Abstract :
A multichannel ultrashort pulse reflectometry (USPR) system has been upgraded to enhance the performance of simultaneously measuring electron density profiles and fluctuations on the sustained spheromak physics experiment device (SSPX). In addition to the use of a high power frequency multiplier in the transmitter subsystem, the optimization of filter bandwidths in the receiver subsystem results in significant improvement of the dynamic range and signal-to-noise ratios of the USPR signals, thereby dramatically reducing the number of "lost" signals. Details of the upgraded USPR system are described together with USPR profile and fluctuation data.
Keywords :
circuit optimisation; frequency multipliers; microwave reflectometry; millimetre wave filters; millimetre wave frequency convertors; millimetre wave mixers; plasma confinement; plasma density; plasma diagnostics; plasma fluctuations; 1 to 3 ns; SSPX; USPR signal-to-noise ratios; dynamic range improvements; electron density fluctuations; electron density profile measurement; high power frequency multipliers; lost signal reduction; millimeter-wave mixers; multichannel USPR; plasma density profiles; plasma diagnostics; receiver subsystem filter bandwidth optimization; sustained spheromak physics experiment device; transmitter subsystems; ultrashort duration chirped waveforms; ultrashort pulse reflectometry systems; Bandwidth; Density measurement; Electrons; Filters; Fluctuations; Frequency; Physics; Pulse measurements; Reflectometry; Transmitters;
Conference_Titel :
Infrared and Millimeter Waves, 2002. Conference Digest. Twenty Seventh International Conference on
Conference_Location :
San Diego, CA, USA
Print_ISBN :
0-7803-7423-1
DOI :
10.1109/ICIMW.2002.1076087
