A large-aperture strip-grid beam splitter for partially combined two millimeter-wave diagnostics on Korea Superconducting Tokamak Advanced Research

Lee, D J; Lee, W; Park, H K; Kim, T G

doi:10.1063/1.5066611

Cited by 1 publication

(2 citation statements)

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“…The plasma-facing lens is shared by the two diagnostics, and the strip-grid beam splitter efficiently divides two linearly polarized beams: 300 GHz O-mode beam for the CSS and 78-96 GHz X-mode beam for the MIR system. (b) Reproduced from [25] and (c) reproduced from [29], with the permission of AIP Publishing.…”

Section: The Optical Systemmentioning

confidence: 99%

“…Second, several new lenses were added to operate the two systems independently while a front optics is shared. In order to share the front optics, a large-aperture beam splitter was developed based on the metal strips on a thin dielectric sheet [29]. The beam splitter effectively separates the 78-96 GHz X-mode beam for the MIR system and the 300 GHz O-mode beam for the CSS, with substantially reduced power loss.…”

Section: Introductionmentioning

confidence: 99%

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Development of a collective scattering system and its application to the measurement of multiscale fluctuations in KSTAR plasmas

Lee

Park

et al. 2021

Plasma Phys. Control. Fusion

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A four-channel collective scattering system (CSS) has been developed to extend the current turbulence measurement capability (poloidal wavenumber < 3 cm−1) beyond the ion gyroscale in the KSTAR tokamak. By utilizing a 300 GHz probe beam and four-channel detector array, the CSS can measure electron density fluctuations of four distinct poloidal wavenumbers from 14 to 26 cm−1 at a high sampling rate (typically 10 MS s−1). In between discharges the radial measurement location can be varied from the plasma center to the outer edge with the remote control of the optical system. In this paper, the details of the major components and laboratory evaluation of the optical system are described. Several initial measurements such as (1) the broadband turbulence reduction during L–H transition, (2) the broadband turbulence increase in H-mode when the amplitude of edge-localized mode crashes is reduced by increased density, (3) the amplification of a quasi-coherent mode by additional heating in high-performance H-mode, and (4) the appearance of high-frequency magnetohydro-dynamical modes during slow L–H transition, are briefly presented. The possibility of the CSS as a hybrid system (of a scattering system and fluctuation interferometer), which complicates the interpretation of the CSS data, is also discussed.

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Section: The Optical Systemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Development of a collective scattering system and its application to the measurement of multiscale fluctuations in KSTAR plasmas

Lee

Park

et al. 2021

Plasma Phys. Control. Fusion

Self Cite

View full text Add to dashboard Cite

show abstract

A large-aperture strip-grid beam splitter for partially combined two millimeter-wave diagnostics on Korea Superconducting Tokamak Advanced Research

Abstract: A single-chip integrated transceiver for high field NMR magnetometry Review of Scientific Instruments 90, 015001 (2019);

Cited by 1 publication

References 12 publications

Development of a collective scattering system and its application to the measurement of multiscale fluctuations in KSTAR plasmas

Development of a collective scattering system and its application to the measurement of multiscale fluctuations in KSTAR plasmas

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