Development of multi-channel Doppler spectroscopic measurement system using 8 × 8 multianode photomultiplier tube assembly

Abstract

Using an 8 × 8 channel photomultiplier tube assembly and a single Czerny-Turner monochromator, we have developed a novel Doppler spectroscopic system which can measure the time evolutions of spectral distribution of plasma emission from eight different lines of sight simultaneously. An optical lens system is employed to couple the output of the monochromator with the detector assembly, resulting in small cross-talks less than 5% in spatial distribution together with large magnification of up to 50 in wavelength direction. The suggested system yields cost-effective polychromatic measurements of eight spatial channels with uniform optical and electrical characteristics.

Magnetic island dynamics in magnetic reconnection in UTST experiments

“…This system has eight wavelength channels in each of the spatial lines-of-sight with a time resolution of shorter than 1 ls. 18 In this experiment, we utilized the radial line-of-sight to measure the radial ion flow velocity. The plasma emission structure during magnetic reconnection shown in Fig.…”

Measurement of Argon emission spectral of ICP plasma using a diagnostic system based on photomultiplier tubes array

“…Optical emission spectroscopy (OES) has been proved to be a powerful technique in plasma diagnostics [4][5][6][7]. There are mainly two kinds of OES methods, one is measurement of the spectrum of certain wavelengths by PMT and slit [2][3][4][5], the other is using two-dimensional detector arrays such as charge coupled device (CCD) or intensified charge-coupled device (iCCD) camera to provide the spatial multi-channel spectrum of a range of wavelengths [6,7]. The CCDs own various advantages including their subtle detector dimension, high sensitivity, and significant signal to noise ratio.…”

Development of Multichannel Ion Doppler Spectroscopic System by Using Fast Camera

“…The Doppler spectroscopy has been applied to many plasma confinement devices [1][2][3][4]. The Doppler spectroscopy has been applied to many plasma confinement devices [1][2][3][4].…”

“…where c is the light speed. The Doppler spectroscopy has been applied to many plasma confinement devices [1][2][3][4]. Multichannel photomultiplier tube (PMT) is often used to generate pulsed plasma, of which the discharge time is from hundreds of microseconds to tens of milliseconds.…”

“…The Doppler spectroscopy using PMT needs the lens between exit slit and PMT to enlarge light spectrum so that it matches PMT. Also, when multiple viewing chords are measured spatially, the imaging to two-dimensional (2D) PMT is required by broadening light in both the wavelength and the spatial directions using two sets of two optical lens [2]. To realize this system, complex optics and arrangement adjustment are needed, and the construction of the system needs the device installation technique.…”