2D profile of poloidal magnetic field diagnosed by a laser-driven ion-beam trace probe (LITP)

Yang, Xiaoyi; Xiao, Chijie; Chen, Yihang; Xu, Tianchao; Lin, Chen; Long, Wang; Xu, M.; Yu, Yijun

doi:10.1063/1.4960761

Cited by 12 publications

(10 citation statements)

References 12 publications

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“…29 This technical feature is of great importance not only in high energy density physics studies, but also in magnetic fusion plasma studies by enabling poloidal magnetic and electric eld measurement in 2D pro les. 30 An implication of creating a large V d in a proton and modest-Z ion plasma of ~10 2 keV in temperature would be a rst laboratory experiment on the aneutronic CNO fusion chain 1-2 reaction rates. By replacing 11 B with some of the stable isotopes in this reaction chain ( 12 C, 13 C, 14 N, or 15 N), a fusion device could be so arranged as to measure the corresponding fusion reaction rates, albeit at minute yet detectable levels.…”

Section: Discussionmentioning

confidence: 99%

Toroidal plasma conditions where the p-11B fusion Lawson criterion could be eased

Peng¹,

Shi²,

Wang³

et al. 2020

Preprint

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We examine the theoretical conditions in which the Lawson ignition criterion for p-11B fusion in a magnetized toroidal plasma can be reduced substantially. It is determined that a velocity differential between the protons and the boron ions of the order of the plasma sound speed (Mach number of 1 or 2 at a plasma temperature of ~102 keV) could raise the p-11B fusion reaction rate to ~2x10-22 m3/s or ~6x10-22 m^3/s, respectively, from the ~1x10-22 m3/s level in a static plasma. The Lawson triple product (ni τE Ti) required for ignition can thereby be reduced to as low as ~1023 m-3 s keV, which is one order of magnitude above the ITER requirement for D-T burn. Since order-unity Mach numbers in velocity differentials between deuterons and impurity carbon ions have been maintained in tokamak plasmas under excellent confinement conditions, similar levels of velocity differentials between protons and minority boron-11 ions could in principle be maintained also. A theoretical possibility of achieving p-11B fusion ignition in a toroidal plasma of ~102 keV in ion temperature is hereby presented. Similar p-13C plasmas, for example, will introduce a possibility of measuring the CNO fusion chain reaction rates in a laboratory.

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Section: Discussionmentioning

confidence: 99%

Toroidal plasma conditions where the p-11B fusion Lawson criterion could be eased

Peng¹,

Shi²,

Wang³

et al. 2020

Preprint

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“…In tokamak devices, B t B p , so the motion of ion traces caused by B p and E r is small . In this case, the reconstruction result is very good when we assumed that the toroidal displacement is a linear integration of B p along the ion traces, and the poloidal displacement is an integration of E r [1,3]. But in some other toroidal devices, such as the spherical tokamaks, RFPs, B p is too much large to match the linear assumption [8][9][10].…”

Section: Introductionmentioning

confidence: 98%

“…The Laser-driven Ion-beam Trace Probe (LITP), a new method to diagnose poloidal magnetic field (B p ) and radial electric field (E r ) in tokamaks, was firstly proposed in 2014 [1,2]. In 2016, LITP was proposed to diagnose 2D profiles of B p in a single pulse [3]. Experiments to validate the principle of LITP method had been set upon the PKU Plasma Test (PPT) device [3,4].…”

Section: Introductionmentioning

confidence: 99%

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Theoretical study on the laser-driven ion-beam trace probe in toroidal devices with large poloidal magnetic field

et al. 2018

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A: Recently, a new diagnostic method, Laser-driven Ion-beam Trace Probe (LITP), has been proposed to reconstruct 2D profiles of the poloidal magnetic field (B p ) and radial electric field (E r ) in the tokamak devices. A linear assumption and test particle model were used in those reconstructions. In some toroidal devices such as the spherical tokamak and the Reversal Field Pinch (RFP), B p is not small enough to meet the linear assumption. In those cases, the error of reconstruction increases quickly when B p is larger than 10% of the toroidal magnetic field (B t ), and the previous test particle model may cause large error in the tomography process. Here a nonlinear reconstruction method is proposed for those cases. Preliminary numerical results show that LITP could be applied not only in tokamak devices, but also in other toroidal devices, such as the spherical tokamak, RFP, etc. K: Plasma diagnostics -charged-particle spectroscopy; Plasma diagnostics -probes 1Corresponding author.

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“…In this case a pulsed beam of MeV ions with high energy spread and multiple charge states is obtained. The concept intends to measure the spatial distribution of ions at the wall of the fusion machine which enables the reconstruction of the radial electric field, electron density 16 and the poloidal magnetic field 17 .…”

Section: Introductionmentioning

confidence: 99%

Micro-Faraday cup matrix detector for ion beam measurements in fusion plasmas

Réfy

Zoletnik

Dunai

et al. 2019

Review of Scientific Instruments

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Atomic Beam Probe (ABP) is an extension of the routinely used Beam Emission Spectroscopy (BES) diagnostic for plasma edge current fluctuation measurement at magnetically confined plasmas. Beam atoms ionized by the plasma are directed to a curved trajectory by the magnetic field and may be detected close to the wall of the device. The arrival location and current distribution of the ions carry information about the plasma current distribution, the density profile and the electric potential in the plasma edge. This paper describes a micro-Faraday cup matrix detector for the measurement of the few microampere ion current distribution close to the plasma edge. The device implements a shallow Faraday cup matrix, produced by printed-circuit board technology. Secondary electrons induced by the plasma radiation and the ion bombardment are basically confined into the cups by the tokamak magnetic field. Additionally, a double mask is installed in the front face to limit ion influx into the cups and supplement secondary electron suppression. The setup was tested in detail using a Lithium ion beam in the laboratory. Switching time, cross talk and fluctuation sensitivity test results in the lab setup are presented, along with the detector setup to be installed at the COMPASS tokamak.

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2D profile of poloidal magnetic field diagnosed by a laser-driven ion-beam trace probe (LITP)

Cited by 12 publications

References 12 publications

Toroidal plasma conditions where the p-11B fusion Lawson criterion could be eased

Toroidal plasma conditions where the p-11B fusion Lawson criterion could be eased

Theoretical study on the laser-driven ion-beam trace probe in toroidal devices with large poloidal magnetic field

Micro-Faraday cup matrix detector for ion beam measurements in fusion plasmas

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