Steady state ECRH for next step superconducting fusion devices

Erckmann, V.

doi:10.1016/j.fusengdes.2008.11.105

Cited by 9 publications

(6 citation statements)

References 40 publications

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“…While this mode is ideal for low loss in the transmission line between the gyrotron and VENUS, it does not appear to be the best choice for coupling to the ECRIS plasma. In many plasma fusion devices, wave guide components are used to transform RF power from TE 01 mode to either a TE 11 or HE 11 mode before directing it onto the ECR location. 9 Analysis of how to modify the injection geometry of the VENUS 28 GHz system to adopt this technique is now underway.…”

Section: Rf Couplingmentioning

confidence: 99%

“…10 The second more complex method would be to convert the 28 GHz into a quasi-Gaussian beam and use mirrors to direct the power. 11 In any case, improving the coupling of the 28 GHz to the plasma in VENUS has the potential to significantly improve its performance, since qualitatively the 18 GHz RF injected in the TE11 mode appears to couple more efficiently than the 28 GHz RF injected in the TE01 mode.…”

Section: Rf Couplingmentioning

confidence: 99%

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Recent progress on the superconducting ion source VENUS

Benitez

Franzen

Hodgkinson

et al. 2012

Review of Scientific Instruments

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The 28 GHz Ion Source VENUS (versatile ECR for nuclear science) is back in operation after the superconducting sextupole leads were repaired and a fourth cryocooler was added. VENUS serves as an R&D device to explore the limits of electron cyclotron resonance source performance at 28 GHz with its 10 kW gryotron and optimum magnetic fields and as an ion source to increase the capabilities of the 88-Inch Cyclotron both for nuclear physics research and applications. The development and testing of ovens and sputtering techniques cover a wide range of applications. Recent experiments on bismuth demonstrated stable operation at 300 eμA of Bi31+, which is in the intensity range of interest for high performance heavy-ion drivers such as FRIB (Facility for Rare Isotope Beams). In addition, the space radiation effects testing program at the cyclotron relies on the production of a cocktail beam with many species produced simultaneously in the ion source and this can be done with a combination of gases, sputter probes, and an oven. These capabilities are being developed with VENUS by adding a low temperature oven, sputter probes, as well as studying the RF coupling into the source.

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Section: Rf Couplingmentioning

confidence: 99%

Section: Rf Couplingmentioning

confidence: 99%

Recent progress on the superconducting ion source VENUS

Benitez

Franzen

Hodgkinson

et al. 2012

Review of Scientific Instruments

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“…In the magnetic-confinement nuclear fusion field, the electron cyclotron resonance heating system is widely used for plasma heating, current profile and magnetohydrodynamics control, start up, current drive, etc [1,2] . The HL-2A is a divertor tokamak which mainly focuses on the issues of fusion research, such as confinement improvement, divertor and scrape-off layer physics, wall conditioning, magnetohydrodynamics (MHD) instability and energetic particles, auxiliary heating and current drive [3] .…”

Section: Introductionmentioning

confidence: 99%

The 5.8 T Cryogen-Free Gyrotron Superconducting Magnet System on HL-2A

Xia

Huang

Zhou

et al. 2014

Plasma Sci. Technol.

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A 5.8 T cryogen-free superconducting magnet (SCM) system with a warm bore hole of 160 mm in diameter, used for gyrotrons operating in the frequency range from 68 GHz to 140 GHz, is installed on the site of the HL-2A tokamak. The SCM consists of two separate solenoidal magnetic coils connected in series, a 4.2 K Gifford-McMahon (GM) refrigerator, a compressor, a coil power supply and two temperature monitors. The performance, test and preliminary experimental results of this SCM system are described in this paper. The magnetic field distribution was measured along the axis, and a dummy tube was used for adjusting the magnet system. Finally, the magnet was used for the operation of a 68 GHz/500 kW gyrotron, which is part of an electron cyclotron resonance heating (ECRH) system. With an additional auxiliary coil and after adjusting the magnet system, a maximum output power for the ECRH system of up to 400 kW was achieved.

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“…The good theoretical understanding of the wave-particle interaction physics, which is benchmarked in many experiments, provides a good quantitative predictability [1]. ECRH complies with various physics demands such as controlled plasma start-up from the neutral gas, steady state plasma stability control, and performance optimization by plasma profile shaping using both the heating and current drive capability.…”

Section: Introductionmentioning

confidence: 99%

Large Scale CW ECRH Systems: Some considerations

Erckmann

Kasparek

Plaum

et al. 2012

EPJ Web of Conferences

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Abstract. Electron Cyclotron Resonance Heating (ECRH) is a key component in the heating arsenal for the next step fusion devices like W7-X and ITER. These devices are equipped with superconducting coils and are designed to operate steady state. ECRH must thus operate in CW-mode with a large flexibility to comply with various physics demands such as plasma start-up, heating and current drive, as well as configurationand MHD -control. The request for many different sophisticated applications results in a growing complexity, which is in conflict with the request for high availability, reliability, and maintainability. 'Advanced' ECRH-systems must, therefore, comply with both the complex physics demands and operational robustness and reliability. The W7-X ECRH system is the first CW-facility of an ITER relevant size and is used as a test bed for advanced components. Proposals for future developments are presented together with improvements of gyrotrons, transmission components and launchers.

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Steady state ECRH for next step superconducting fusion devices

Cited by 9 publications

References 40 publications

Recent progress on the superconducting ion source VENUS

Recent progress on the superconducting ion source VENUS

The 5.8 T Cryogen-Free Gyrotron Superconducting Magnet System on HL-2A

Large Scale CW ECRH Systems: Some considerations

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