Experience on the high-power SiC microwave dummy-load using SiC absorber

Matsumoto, Hisao; Iino, Y.; Fujiwara, Chika; Kabeya, Z.; Onda, Tomomi

doi:10.1109/pac.1999.795374

Cited by 10 publications

(6 citation statements)

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“…It is also planned to design and produce a pillbox cavity with coupler antenna for simple low power tests before designing the final accelerator cavity. Silicon Carbide (SiC) ceramic will be used as an absorber in the RF dummy load [3]. A 100 W, 800 (±5) MHz custom-made RF power supply produced in Turkey will be used for the initial tests to understand the related problems and prepare the system for high power tests.…”

Section: Design Studiesmentioning

confidence: 99%

KAHVE Laboratory RF circulator and transmission line project

Çetinkaya

Çağlar

Çicek

et al. 2018

AIP Conference Proceedings

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An 800 MHz RF circulator and transmission line project has recently started at the newly commissioned Kandilli Detector, Accelerator and Instrumentation (KAHVE) Laboratory at the Boğaziçi University. The aims are to design, build and construct an RF circulator and transmission line in Turkey for high power and high frequency applications. The project consists of 8 transmission line elements: 800 MHz RF generator with 60 kW power (klystron), klystron to waveguide converter, waveguides, E and H bends, 3-port circulator and waveguide to coaxial converter to transmit RF power to a pillbox RF cavity. Design studies and details of the ongoing project will be presented.

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Section: Design Studiesmentioning

confidence: 99%

KAHVE Laboratory RF circulator and transmission line project

Çetinkaya

Çağlar

Çicek

et al. 2018

AIP Conference Proceedings

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“…The dielectric constant of SiC is taken to be $30 ( Matsumoto et al 1999); that of graphite is taken to be 3. For corundum, " ¼ 9:1, whereas for spinel, " ¼ 8:3.…”

Section: A Careful Balance Of Forcesmentioning

confidence: 99%

A Mechanism for the Equilibrium Growth of Mineral Crystals in AGB Stars and Red Giants on 10⁵yr Timescales

Nuth

Wilkinson²,

Johnson

et al. 2006

ApJ

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We show that for particle sizes ranging from a few hundred angstroms up to several tens of microns in diameter the force exerted by radiation pressure in some red giant and AGB stars exceeds the force of gravity and thus offers the potential for graphite, SiC, corundum, and spinel grains to grow to the size range observed in primitive meteorites (e.g., up to $25 m). In the highest mass AGB stars radiation pressure on growing grains greatly exceeds the force of gravity and thus ejects a grain from the star before it can grow larger than a few tens of nanometers. Only in very low mass AGB stars ( less than 3 M ) does the radiative force balance the gravitational force to such a fine degree that the net acceleration on individual particles ranging from a few nanometers up to about 25 m produces particle velocities that are comparable to atmospheric turbulence. Our analysis shows that the large graphite, SiC, corundum, and spinel crystals found in primitive meteorites can only have formed in the atmospheres of the lowest mass red giant and AGB stars, where particle growth is able to occur on timescales of a hundred thousand years under near-equilibrium conditions. We note that this suggestion is contrary to the standard assumption that grains can only form in stellar winds and implies that there may be a class of grains that can form in chemical equilibrium deep within the stellar atmosphere, just above the photosphere.

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“…4. 13 The SiC cylinders were brazed on the copper spacer and cooled only via the spacer. The Q value of the trapped mode reduced to less than 100.…”

Section: No Hom Absorbermentioning

confidence: 99%