First B-dot measurements in the RAID device, an alternative negative ion source for DEMO neutral beams

Jacquier, R.; Agnello, R.; Duteil, Basile Pouradier; Guittienne, Ph.; Howling, A.A.; Plyushchev, G.; Marini, C.; Simonin, A.; Morgal, I.; Béchu, Stéphane; Furno, I.

doi:10.1016/j.fusengdes.2019.02.025

Cited by 13 publications

(14 citation statements)

References 15 publications

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“…For all magnetic fields, the electron temperature Another process that could be invoked to justify the double peak may be the power dissipation mechanism of the helicon waves along the plasma column. Evidence of the propagation of a helicon wave was measured in RAID by a B-dot probe (Jacquier et al 2019). Numerical simulations are currently underway to investigate how the helicon wave power produced by the birdcage antenna is transferred to the plasma, depending on gas pressure, electron density and boundary conditions.…”

Section: Experiments In Argon Plasmasmentioning

confidence: 99%

Application of Thomson scattering to helicon plasma sources

et al. 2020

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The possibility of performing electron density and temperature measurements in a high power helicon plasma is a crucial issue in the framework of the AWAKE (Advanced WAKefield Experiment) project, which demonstrates acceleration of particles using $\text{GeV}~\text{m}^{-1}$ electric fields in plasmas. For AWAKE, a helicon is currently envisaged as a candidate plasma source due to its capability for low electron and ion temperature, high electron density and production of an elongated plasma column. A plasma diagnostic to accurately determine the electron density in AWAKE regimes would be a valuable supporting tool. A demonstration Thomson scattering (TS) diagnostic was installed and successfully tested on the resonant antenna ion device (RAID) at the Swiss Plasma Center of Ecole Polytechnique Fédérale de Lausanne. RAID produces a helicon plasma column with characteristics similar to those of the AWAKE helicon source, and is therefore an optimal testbed for application to the AWAKE device. The spectrometer employed in RAID is based on polychromators which collect the light scattered by plasma electrons in spectrally filtered wavelength regions. Results from TS on RAID demonstrate conditions of electron density and temperature respectively of $n_{e}=1.10\,(\pm 0.19)\times 10^{19}~\text{m}^{-3}$ and $T_{e}=2.3\,(\pm 0.6)~\text{eV}$ in a steady-state discharge in an Ar plasma with 5 kW of RF power. If the same polychromator system is used for AWAKE, where the electron density attained is $2\times 10^{20}~\text{m}^{-3}$ , the contribution to measurement error due to coherent scattering is ${\sim}2.5\,\%$ . Presented here are details of the TS diagnostic and the first tests in RAID, and the expectations for the system when employed on the AWAKE device.

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Section: Experiments In Argon Plasmasmentioning

confidence: 99%

Application of Thomson scattering to helicon plasma sources

et al. 2020

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“…The 3-D B-dot probe developed for this work is inspired by the design reported in Ref. (32) and it consists of: a main body, three orthogonal magnetic pickup coils, a protective cover and a noninductive pickup rejection filtering unit.…”

Section: A B-dot Probementioning

confidence: 99%

Direct experimental comparison of krypton and xenon discharge properties in the magnetic nozzle of a helicon plasma source

Vinci

Mazouffre

2021

Physics of Plasmas

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HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

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“…Once the correct resonance peak is identified, the capacitance is swept until the targeted peak is at 40.68 MHz. The externally applied magnetic field is expected to trigger the formation of helicon waves within the discharge channel therefore providing a higher plasma density and a more efficient ionization [21,22]. As can be seen, the resonance frequency of k = 1 presents S 11 = −8.4 dB that translates in the fact that the real part R of the impedance Z is not perfectly matched to that of the RF generator output, and that requires further matching/tuning of R only to reach a more desired S 11 < −20 dB for having > 99% power coupling.…”

Section: Ipt Design With a Birdcage Antennamentioning

confidence: 99%

“…Those devices are already studied in literature but generally use different kind of antennae, mainly halfhelical, Nagoya type, or coil type [19,20]. The RF discharge is aided by an external static magnetic field applied axially that provides the necessary conditions for the formation of helicon waves within the plasma, delivering increased plasma density and better power coupling efficiency [21,22]. The currently investigated helicon plasma thrusters are those from the Australian National University (ANU) [23], the University of Madrid, Spain [24], the University of Maryland, USA [25], the company T4i, Italy [26], the Tohoku University, Japan [27], the Tokyo University of Agriculture and Technology, Japan [20], and the Washington University, USA [28].…”

Section: Introductionmentioning

confidence: 99%

“…Such antenna has been investigated for space propulsion in [30], but it is the first time that it is implemented in a plasma thruster. Currently, birdcage antennae are used at EPFL as plasma source for fusion research, called RAID, in which helicon waves have been measured [22,[31][32][33]. The birdcage antenna reduces overall power consumption and matching requirements by operating at resonance condition, and it is designed to provide an EM field configuration that both ionizes the propellant and is expected to contribute to the acceleration of a quasi-neutral plasma plume.…”

Section: Introductionmentioning

confidence: 99%

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RF Helicon-based Inductive Plasma Thruster (IPT) Design for an Atmosphere-Breathing Electric Propulsion system (ABEP)

et al. 2020

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Challenging space missions include those at very low altitudes, where the atmosphere is source of aerodynamic drag on the spacecraft. To extend such missions lifetime, an efficient propulsion system is required. One solution is Atmosphere-Breathing Electric Propulsion (ABEP). It collects atmospheric particles to be used as propellant for an electric thruster. The system would minimize the requirement of limited propellant availability and can also be applied to any planet with atmosphere, enabling new mission at low altitude ranges for longer times. Challenging is also the presence of reactive chemical species, such as atomic oxygen in Earth orbit. Such species cause erosion of (not only) propulsion system components, i.e. acceleration grids, electrodes, and discharge channels of conventional EP systems. IRS is developing within the DISCOVERER project, an intake and a thruster for an ABEP system. The paper describes the design and implementation of the RF helicon-based inductive plasma thruster (IPT). This

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First B-dot measurements in the RAID device, an alternative negative ion source for DEMO neutral beams

Cited by 13 publications

References 15 publications

Application of Thomson scattering to helicon plasma sources

Application of Thomson scattering to helicon plasma sources

Direct experimental comparison of krypton and xenon discharge properties in the magnetic nozzle of a helicon plasma source

RF Helicon-based Inductive Plasma Thruster (IPT) Design for an Atmosphere-Breathing Electric Propulsion system (ABEP)

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