X-ray investigation on the Superconducting Source for Ions (SuSI)

Neben, Derek; Fogleman, Jesse; Isherwood, B. J.; Leitner, D.; Machicoane, G.; Renteria, Shane; Stetson, J.; Tobos, L.

doi:10.1088/1748-0221/14/02/c02008

Cited by 11 publications

(10 citation statements)

References 9 publications

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“…This means that the present diagnostics is unable to reveal oscillating behavior with significant variations of plasma parameters with resolution lower than the ms. Different independent measurements [13,14,29,30] have shown that the same threshold value found in this paper plays a key role in establishing the conditions for Cyclotron-Maser instabilities. A future paper will discuss about time-resolved measurements able to show temporal evolution of plasma parameters in sub-ms temporal domain.…”

Section: Discussionsupporting

confidence: 70%

Multidiagnostics investigation of the role of the magnetic field profile in a simple mirror trap

Castro

Mazzaglia

Briefi

et al. 2019

Phys. Rev. Accel. Beams

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The impact of the magnetic field profile on the operations of plasma-based Electron Cyclotron Resonance Ion Sources (ECRIS) has been debated and investigated for a long time, and a summary is given by the collection of the so-called "magnetic scaling laws", i.e., some rules-of-thumb providing the optimal configuration of the axial and radial confining magnetic fields. Anyway, the optimal configurations have been found just looking at the output beam currents and charge states. Only recently, more advanced experiments have shown that the optimal performances are related to some "islands" in the parameters space leading to a dense, energetic but stable plasma. A general, systematic characterization of plasma density and temperature as a function of the magnetic scaling, and for different energy domains (i.e., for cold, warm, and hot electrons) is not yet available. This paper presents a multidiagnostics characterization of a hydrogen plasma heated by microwaves at around 6.8 GHz via Electron Cyclotron Resonance, and confined in an axisymmetric simple mirror magnetic trap. Investigation of plasma response to solely the axial field profile gives the unique opportunity to decouple the effect of simple mirror field from the radial components that are, usually, provided by a hexapole. Optical emission spectroscopy, Langmuir probe, and an x-ray silicon drift detector were simultaneously used to evaluate the plasma density and temperature in different energy domains, thus exploring the electron energy distribution function from a few eV to hundreds of keV. Plasma parameters have been measured as a function of the magnetic field profile (in particular by varying the ratio B min =B ECR), of the microwave power and of the neutral pressure. Furthermore, for the same scaling, the relative abundances of H atoms and H 2 have been estimated. Data show smooth trends of electron density and temperatures versus microwave power and neutral pressure, but strong and even nonlinear responses as a function of the magnetic field profile variation, allowing us to connect semiempirical scaling laws to changes in plasma parameters.

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Section: Discussionsupporting

confidence: 70%

Multidiagnostics investigation of the role of the magnetic field profile in a simple mirror trap

Castro

Mazzaglia

Briefi

et al. 2019

Phys. Rev. Accel. Beams

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“…The highest value of the magnetic field will be in correspondence of the injection and/or extraction axial coils inner surface, so during the numerical design of the magnetic system one has to be careful at not exceeding the threshold field values relative to the magnet material. In superconducting traps, special attention must be paid to the minimum field, B min , that should be tuneable within a wide range of values: it has been experimental observed that, in order to obtain the highest electron density and to reach the optimal charge state, one has to have 0.65 < B min /B ECR < 0.75 Benitez et al [5]; Mazzaglia et al [6]; Neben et al [7]. If this ratio exceeds the upper value, sudden non linear effects arise, increasing the plasma x-ray emission and thus the heat load on the cryostat.…”

Section: Ecr Ion Sources Magnetic Systemmentioning

confidence: 99%

An Innovative Superconducting Magnetic Trap for Probing β-decay in Plasmas

et al. 2022

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The main aim of Plasmas for Astrophysics Nuclear Decays Observation and Radiation for Archaeometry (PANDORA) project is to build a compact and flexible magnetic plasma trap where plasma reaches a density ne ∼ 1011–1013 cm−3, and a temperature, in units of kT, kTe ∼ 0.1–30 keV in order to measure, for the first time, nuclear β-decay rates in stellar-like conditions. One of the most important aspects of an ECR Ion Source (ECRIS) is its magnetic system. In this paper, the numerical design of the PANDORA magnetic system is presented and validated by using the commercial simulators OPERA and CST Studio Suite, showing an excellent agreement between each other in terms of axial and radial field profiles. In conjunction to the magnetic system design, the overall injection system, including the microwave lines for plasma heating and the isotopes injection schemes with a focus on the developments of the oven for solid elements, has been conceived and will be discussed.

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“…X-ray plasma diagnostics for ECR (Electron Cyclotron Resonance) ion sources and traps have been developed along the years allowing volumetric characterization of the plasma [5][6][7][8][9][10][11]. At INFN-LNS several non invasive plasma diagnostic tools have been developed [12], with advanced analytical methods [13].…”

Section: Introductionmentioning

confidence: 99%

Quantitative analysis of an ECR Ar plasma structure by X-ray spectroscopy at high spatial resolution

et al. 2022

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In the frame of the PANDORA_Gr3 project, aiming at measuring for the first time in-plasma nuclear β-decays of astrophysical interest, an innovative multi-diagnostic approach to correlate plasma parameters to nuclear activity has been proposed [1–3]. This is based on several detectors and techniques (optical emission spectroscopy, RF systems, interferopolarimetry) and here we focus on high resolution spatially-resolved X-ray spectroscopy, performed by means of a X-ray pin-hole camera setup sensitive in the 0.5–20 keV energy domain. We present measurements on an Ar plasma heated by Electron Cyclotron Resonance at the ECR-plasma lab of ATOMKI-Debrecen. The achieved spatial and energy resolution were 0.5 mm and 300 eV at 8 keV, respectively [4]. The new algorithm of analysis for single-photon-counted images has been developed allowing an investigation in High-Dynamic-Range (HDR) mode. Hence a spatially resolved quantitative characterization of plasma vs. plasma walls emitted spectra was done; the investigated electrons are the ones crucial for in-plasma ionization. Both stable and turbulent plasma regimes can be investigated.

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X-ray investigation on the Superconducting Source for Ions (SuSI)

Cited by 11 publications

References 9 publications

Multidiagnostics investigation of the role of the magnetic field profile in a simple mirror trap

Multidiagnostics investigation of the role of the magnetic field profile in a simple mirror trap

An Innovative Superconducting Magnetic Trap for Probing β-decay in Plasmas

Quantitative analysis of an ECR Ar plasma structure by X-ray spectroscopy at high spatial resolution

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