title: Digital I/Q demodulation for KSTAR ion cyclotron range of frequency system.
abstract: An ion cyclotron range of frequency system requires rf diagnostics for a rf-plasma coupling or for maintaining a correct operation. A detector based on a digital I/Q demodulation technique collects the rf amplitude and phase at the same time without errors from the I/Q imbalance inherent in an analog counterpart. The theory of such a detector was studied and implemented for the first campaign of the KSTAR tokamak. Experimental results of the rf and other diagnostics are presented and discussed.
authors.affiliation: Korea Atomic Energy Research Institute, Daejeon 305-353, Korea. sjwang@kaeri.re.kr
authors.forename: S J
authors.initials: SJ
authors.lastname: Wang
authors.forename: J G
authors.initials: JG
authors.lastname: Kwak
authors.forename: C K
authors.initials: CK
authors.lastname: Hwang