Circuit Design to Stabilize the Reflectometer Local Oscillator Signals

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Reflectometry, which uses the microwave radar technique to probe the magnetically confined fusion plasmas, is a very powerful tool to observe the density fluctuations in the fusion plasmas. Typically, two or more microwave beams of different frequencies are used to study the plasma density fluctuations. The frequency separation between these two beams of the PPPL designed reflectometer system upgrade on the DIII-D tokamak can be varied over 18 GHz. Due to the performance of the associated electronics, the local oscillator (LO) power level at the LO port of the I/Q demodulator suffers more than 12 dB of power fluctuations when ... continued below

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Kung CC, Kramer GJ, Johnson E, Solomon W, Nazikian R October 4, 2005.

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Reflectometry, which uses the microwave radar technique to probe the magnetically confined fusion plasmas, is a very powerful tool to observe the density fluctuations in the fusion plasmas. Typically, two or more microwave beams of different frequencies are used to study the plasma density fluctuations. The frequency separation between these two beams of the PPPL designed reflectometer system upgrade on the DIII-D tokamak can be varied over 18 GHz. Due to the performance of the associated electronics, the local oscillator (LO) power level at the LO port of the I/Q demodulator suffers more than 12 dB of power fluctuations when the frequency separation is varied. Thus, the I/Q demodulator performance is impaired. In order to correct this problem, a power leveling circuit is introduced in the PPPL upgrade. According to the test results, the LO power fluctuation was regulated to be within 1 dB for greater than 16 dB of input power variation over the full dynamic bandwidth of the receiver.

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5.8 Mb

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  • Related Information: Presented at: the Twenty-First Symposium on Fusion Engineering (SOFE2005), 26 - 29 September 2005, Knoxville, Tennessee USA.

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  • Report No.: PPPL-4113
  • Grant Number: DE-AC02-76CH03073
  • Office of Scientific & Technical Information Report Number: 899525
  • Archival Resource Key: ark:/67531/metadc882830

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  • October 4, 2005

Added to The UNT Digital Library

  • Sept. 22, 2016, 2:13 a.m.

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  • Nov. 18, 2016, 9:59 p.m.

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Kung CC, Kramer GJ, Johnson E, Solomon W, Nazikian R. Circuit Design to Stabilize the Reflectometer Local Oscillator Signals, report, October 4, 2005; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc882830/: accessed December 16, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.