High resolution polarimeter-interferometer system for fast equilibrium dynamics and MHD instability studies on Joint-TEXT tokamak (invited)

Chen, J.; Zhuang, G.; Li, Q.; Liu, Y.; Gao, Li; Zhou, Yinan; Xiang, Jian; Xiong, Chunyan; Wang, Z. J.; Brower, D. L.; Ding, W. X.

doi:10.1063/1.4891603

Cited by 61 publications

(50 citation statements)

References 21 publications

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“…The eddy current in the vacuum vessel decreases the field amplitude of 3/1 component to about 0.29 Gs/kA at plasma edge for fRMP = 5.3 kHz. In the experiment, the electron density is measured by multi-channel polarimeter-interferometer (POLARIS) [36], which views the plasma vertically by 14 channels with the impact positions ranging from R = 0.84 m to 1.29 m as shown in figure 2, and the spatial temporal resolution are 30 mm and 1 s. The electron density provided by the channel at/around R = 1.05 m is used to interpret the experimental results in the context.…”

Section: Methodsmentioning

confidence: 99%

Plasma response to m/n = 3/1 resonant magnetic perturbation at J-TEXT Tokamak

Wang

et al. 2016

Nucl. Fusion

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The influence of resonant magnetic perturbations (RMPs) with a large m/n = 3/1 component on electron density has been studied on J-TEXT tokamak by using externally applied static and rotating RMPs, where m and n are the poloidal and toroidal mode number, respectively. The detailed time evolution of electron density profile, measured by the polarimeter-interferometer, shows that the electron density ne first increases (decreases) inside (around/outside) of the 3/1 rational surface (RS), and it is increased globally later together with enhanced edge recycling. Associated with field penetration, the toroidal rotation around the 3/1 RS is accelerated in co-Ip direction and the poloidal rotation is changed from electron to ion diamagnetic drift direction. Spontaneous unlocking-penetration circles occur after field penetration if the RMPs amplitude is not strong enough. While for sufficiently strong RMPs, the 2/1 locked mode is also triggered due to mode coupling, and the global density is increased. The field penetration threshold is found to be linearly proportional to the neL (line-integrated density) at the 3/1 RS but to (neL) 0.73 for the ne at plasma core. In addition, for rotating RMPs with a large 3/1 component, field penetration causes global increase in electron density.

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Section: Methodsmentioning

confidence: 99%

Plasma response to m/n = 3/1 resonant magnetic perturbation at J-TEXT Tokamak

Wang

et al. 2016

Nucl. Fusion

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“…For this reason, almost all other machines use wavelengths larger than 100 lm for poloidal polarimetry measurements. For example, ASDEX Upgrade uses the same k ¼ 195 lm deuterium cyanide (DCN) lasers for both interferometry and polarimetry, 32,33 and both EAST and J-TEXT use k ¼ 432:5 lm formic acid (HCOOH) FIR lasers for their combined polarimeter-interferometers (POINT on EAST 21 and POLARIS on J-TEXT 37 ).…”

Section: Table IIImentioning

confidence: 99%

Design study of a combined interferometer and polarimeter for a high-field, compact tokamak

et al. 2020

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This article is the first design study of a combined interferometer and polarimeter on a compact, high-field, high-density, net-energy tokamak. Recent advances in superconducting technology have made possible designs for compact, high magnetic field fusion power plants, such as ARC [Sorbom et al., Fusion Eng. Des. 100, 378 (2015)], and experiments, such as SPARC [Greenwald et al., PSFC Report No. RR-18-2 (2018)]. These new designs create both challenges and opportunities for plasma diagnostics. The diagnostic proposed in this work, called InterPol, takes advantage of unique opportunities provided by high magnetic field and density to measure both line-averaged density and poloidal magnetic field with a single set of CO 2 and quantum cascade lasers. These measurements will be used for fast density feedback control, constraint of density and safety factor profiles, and density fluctuation measurements. Synthetic diagnostic testing using a model machine geometry, called MQ1 (Mission Q ! 1), and profiles simulated with Tokamak Simulation Code indicate that InterPol will be able to measure steady state density and poloidal magnetic field, as well as fluctuations caused by toroidal Alfv en eigenmodes and other phenomena on a high-field compact tokamak.

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“…Chen et al found that through the meta-analysis of amifostine, amifostine can reduce the incidence of radiation pneumonitis in patients with nonsmall cell lung cancer receiving radiotherapy. However, regarding the dosage of amifostine and the long-term efficacy of the drug on patients after treatment, the impact on overall survival is unclear and needs further study [8].…”

Section: Introductionmentioning

confidence: 99%

The Application Value of Spiral CT Lung Densitometry Software in the Diagnosis of Radiation-Induced Lung Injury

Qingsong¹,

Zhu²,

Ge³

et al. 2021

Contrast Media & Molecular Imaging

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In order to study the application value of spiral CT lung density measurement software in the diagnosis of radioactive lung injury, the average CT values of lung apex, hilum, and diaphragm were measured by Pulmo automatic evaluation software of 16-slice spiral CT in 96 patients with different types of radiation lung injury diagnosed by conventional CT and 80 healthy subjects. The radiation lung injury on CT slices was classified, and the lung density was measured. In 96 patients with different types of radiation lung injury, 56 patients had different degrees of increase in average lung density, which was most obvious in the type of air insufficiency and chronic fibrosis. CT values of lung density in the ground glass stage and patch stage of acute radiation pneumonia had little influence due to the range and time of exposure. The lung density of 35 patients with radiation injury was measured in the normal range. There was a significant difference between normal lung density and abnormal lung density in different types of radiation lung injury (X2 = 56.718, P < 0.001 ). The mean lung density of 68 cases was normal and that of 12 cases was abnormal. There was a significant difference in lung density between the lung injury group and the normal group (X2 = 18.027, P < 0.001 ). Spiral CT lung density measurement can accurately evaluate the lung density values of different types of radiation lung injury and judge the correlation between lung density and different types of radiation lung injury. It is of great value to diagnose, locate, and master the radiation dose of different types of radiation lung injury.

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High resolution polarimeter-interferometer system for fast equilibrium dynamics and MHD instability studies on Joint-TEXT tokamak (invited)

Cited by 61 publications

References 21 publications

Plasma response to m/n = 3/1 resonant magnetic perturbation at J-TEXT Tokamak

Plasma response to m/n = 3/1 resonant magnetic perturbation at J-TEXT Tokamak

Design study of a combined interferometer and polarimeter for a high-field, compact tokamak

The Application Value of Spiral CT Lung Densitometry Software in the Diagnosis of Radiation-Induced Lung Injury

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