Development of Ar I and Ar II Measuring System using Laser-Induced Fluorescence Methods in High-Density Helicon Plasma

Kuwahara, Daisuke; Tanida, Yuriko; Watanabe, Masaki; Teshigahara, Naoto; Yamagata, Yuriko; Shinohara, Shunjiro

doi:10.1585/pfr.10.3401057

Cited by 7 publications

(4 citation statements)

References 11 publications

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“…As in situ plasma diagnostics, some measurement techniques have been adopted: Langmuir probe, 3 Mach probe, 4,5 and double probe 6 are major methods due to an easy introduction of local values, although these tools may disturb plasma flow and affect the plasma characteristics. On the contrary, electromagnetic and spectroscopy methods, e.g., microwave interferometer, 7 Laser Induced Fluorescence (LIF) method, [8][9][10] and Laser Thomson Scattering (LTS), 11 are effective ways in terms of non-direct contact measurements with a plasma with good measurement accuracy. In the field of nuclear fusion plasma research, these measurement a) Electronic mail: s172832r@st.go.tuat.ac.jp methods are also utilized widely, reducing contaminations by impurities under the extremely high temperature conditions.…”

Section: Introductionmentioning

confidence: 99%

Spatial measurement in rotating magnetic field plasma acceleration method by using two-dimensional scanning instrument and thrust stand

Furukawa

Takizawa

Yano

et al. 2018

Review of Scientific Instruments

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A two-dimensional scanning probe instrument has been developed to survey spatial plasma characteristics in our electrodeless plasma acceleration schemes. In particular, diagnostics of plasma parameters, e.g., plasma density, temperature, velocity, and excited magnetic field, are essential for elucidating physical phenomena since we have been concentrating on next generation plasma propulsion methods, e.g., Rotating Magnetic Field plasma acceleration method, by characterizing the plasma performance. Moreover, in order to estimate the thrust performance in our experimental scheme, we have also mounted a thrust stand, which has a target type, on this movable instrument, and scanned the axial profile of the thrust performance in the presence of the external magnetic field generated by using permanent magnets, so as to investigate the plasma captured in a stand area, considering the divergent field lines in the downstream region of a generation antenna. In this paper, we will introduce the novel measurement instrument and describe how to measure these parameters.

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Section: Introductionmentioning

confidence: 99%

Spatial measurement in rotating magnetic field plasma acceleration method by using two-dimensional scanning instrument and thrust stand

Furukawa

Takizawa

Yano

et al. 2018

Review of Scientific Instruments

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“…Plasma diagnostics in addition to our present probe method, e.g., as non-contact measurements, Laser Induced Fluorescence (LIF) method, 18,22 which can measure an ion velocity and temperature without disturbing plasma, and other spectroscopies, are effective to crosscheck our previous measurement. In addition, using a thrust measurement method, e.g., a target stand type, which has a cylindrical shape, considering the collision between the target and particle 19,25 is an effective method to estimate this RMF acceleration effect.…”

Section: Discussionmentioning

confidence: 99%

“…Generally, v i data by a Mach probe 12 agree with the ones by Laser Induced Fluorescence (LIF) method within a factor of ∼ 1.5. 22 A local value of n e can be also calculated by an average of ion saturation currents from both electrodes, and these experimental values are derived from time average of each discharge shot by shot, using eight discharges.…”

Section: Plasma Diagnosticsmentioning

confidence: 99%

Electrodeless plasma acceleration system using rotating magnetic field method

et al. 2017

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COLLECTIONS This paper was selected as Featured ARTICLES YOU MAY BE INTERESTED INStudy on electromagnetic plasma propulsion using rotating magnetic field acceleration scheme Physics of Plasmas 24, 043505 (2017) We have proposed Rotating Magnetic Field (RMF) acceleration method as one of electrodeless plasma accelerations. In our experimental scheme, plasma generated by an rf (radio frequency) antenna, is accelerated by RMF antennas, which consist of two-pair, opposed, facing coils, and these antennas are outside of a discharge tube. Therefore, there is no wear of electrodes, degrading the propulsion performance. Here, we will introduce our RMF acceleration system developed, including the experimental device, e.g., external antennas, a tapered quartz tube, a vacuum chamber, external magnets, and a pumping system. In addition, we can change RMF operation parameters (RMF applied current I RMF and RMF current phase difference φ, focusing on RMF current frequency f RMF ) by adjusting matching conditions of RMF, and investigate the dependencies on plasma parameters (electron density n e and ion velocity v i ); e.g., higher increases of n e and v i (∼360 % and 55 %, respectively) than previous experimental results were obtained by decreasing f RMF from 5 MHz to 0.7 MHz, whose RMF penetration condition was better according to Milroy's expression. Moreover, time-varying component of RMF has been measured directly to survey the penetration condition experimentally. © 2017 Author (s)

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“…In a previous research, we have developed 2D LIF system to measure the plasma flow distributions. 17,18) This system had movable laser injection and fluorescence receiving optics for radial and axial scans.…”

Section: Introductionmentioning

confidence: 99%

Spatial Profile of Ion Velocity Distribution Function in Helicon High-Density Plasma by Laser Induced Fluorescence Method

Tanida

Kuwahara

Shinohara

2016

AEROSPACE TECHNOLOGY JAPAN

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Helicon plasma sources have been studied in many fields across science and technology because they can supply high-density plasmas with a broad range of external operating parameters. In our laboratory, we aim to develop a completely electrodeless electric thruster, which is expected to have a high efficiency and a long lifetime, leading to be useful on a deep space exploration. In order to demonstrate and optimize this thruster system, it is important to have detailed distributions of plasma flow. Laser induced fluorescence (LIF) diagnostics, which can measure velocity distribution functions of particles, has advantages from a view point of, e.g., high resolution in time and space, and it can determine an absolute particle velocity and its temperature in addition to its relative density. Here, we have been developing a LIF measurement system using a Multi-Pixel Photon Counter (MPPC) for a multi-channel system. Argon ion velocity depending on the magnetic field gradient in a downstream region is measured by this LIF system.

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Development of Ar I and Ar II Measuring System using Laser-Induced Fluorescence Methods in High-Density Helicon Plasma

Cited by 7 publications

References 11 publications

Spatial measurement in rotating magnetic field plasma acceleration method by using two-dimensional scanning instrument and thrust stand

Spatial measurement in rotating magnetic field plasma acceleration method by using two-dimensional scanning instrument and thrust stand

Electrodeless plasma acceleration system using rotating magnetic field method

Spatial Profile of Ion Velocity Distribution Function in Helicon High-Density Plasma by Laser Induced Fluorescence Method

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