Analysing the distribution of runaway electrons in the EAST tokamak based on SOFT

Zhang, Yongkuan; Hu, Liqun; Zhou, Ruijie; Chen, Meiwen; Yan, Chen; Zhang, Jiayuan; Li, Pan

doi:10.1016/j.fusengdes.2021.112924

“…We initially assumed a multitude of distribution functions, f, for REs, and analyzed the pixel errors of experimental and simulated images to minimize discrepancies. This methodology is detailed in [11]. However, it is important to acknowledge that the actual distribution function of REs in experiments may not align with the assumed distribution used in simulation.…”

Section: The Pre-assumptions Of Distribution Functionmentioning

confidence: 99%

Spatiotemporal analysis of the runaway distribution function based on green function and regularization method

Dong,

Zhou,

Zhang

et al. 2023

Plasma Phys. Control. Fusion

Self Cite

0

View full text Add to dashboard Cite

Runaway electrons (REs) in experimental advanced superconducting tokamak (EAST) typically have an energy level of tens of MeV. Synchrotron radiation images of REs contain a wealth of information, making it crucial to handle this data properly to uncover hidden features. We observed distinct synchrotron radiation images emitted by the REs at different time points throughout the discharges and the focus of our study was an Ohmic discharge characterized by an evident synchrotron pattern and weaker background radiation. This paper aims to verify the feasibility of utilizing the green function and regularization method to obtain the distribution function information of synchrotron radiation images on EAST. We reconstruct the radial density profile of the REs beam by assuming the monoenergetic nature of REs at different time points. We employ the Tikhonov regularization method for this purpose. The results indicate that the radial density profile of the REs beam follows a roughly Gaussian distribution. Moreover, the peak density of the REs beam shifts inward to the magnetic axis as time progresses, a behavior also observed in the experimental image. However, a good fit between the simulated and experimental images is not achieved for all time points. This discrepancy is likely due to the intervention of q = 2 / 1 magnetic islands and the increased complexity of the distribution function in both radial and momentum spaces.

show abstract

“…Только за последние годы опубликованы сотни работ. Наибольшее число статей в последние два года были посвящены изучению влияния УЭ на нагрев плазмы в установках для получения управляемого термоядерного синтеза, см., например, [1][2][3]. В установках типа ТОКАМАК подробно изучаются разряды, генерирующие УЭ, которые приводят к повреждению стенок вакуумной камеры.…”

Section: Introductionunclassified

Длительность Пучка Убегающих Электронов При Субнаносекундном Фронте Импульса Напряжения

Тарасенко¹,

Белоплотов²,

Сорокин³

2022

Журнал Технической Физики

4

0

View full text Add to dashboard Cite

The conditions for obtaining runaway electron (RE) current pulses with a minimum duration at a subnanosecond breakdown of centimeter gaps filled with air at atmospheric pressure were studied. It is shown that the RE current pulse duration depends on many parameters, such as the cathode form, the magnitude of the interelectrode distance, the diameter of the diaphragm, which is part of the anode, as well as on the size of the receiving part of the collector. It has been established that the use of cathodes with an extended edge having a small radius of curvature, RE current pulses consisting of two peaks of picosecond duration can be recorded.

show abstract

“…Hundreds of papers have been published in recent years alone. The largest number of papers in the last two years have been devoted to studying the effect of RE on plasma heating in units for obtaining controlled thermonuclear fusion, see, for example, [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Duration of runaway electron current pulses when applying voltage pulses with a subnanosecond rise time

V.F.

¹

,

D.V.

²

,

D.A.

³

2022

Technical Physics

9

0

View full text Add to dashboard Cite

The conditions for obtaining runaway electron (RE) current pulses with a minimum duration at a subnanosecond breakdown of centimeter gaps filled with air at atmospheric pressure were studied. It is shown that the RE current pulse duration depends on many parameters, such as the cathode form, the magnitude of the interelectrode distance, the diameter of the diaphragm, which is part of the anode, as well as on the size of the receiving part of the collector. It has been established that the use of cathodes with an extended edge having a small radius of curvature, RE current pulses consisting of two peaks of picosecond duration can be recorded. Keywords: runaway electrons, beam current, picosecond pulse duration, subnanosecond breakdown.

show abstract

Analysing the distribution of runaway electrons in the EAST tokamak based on SOFT

Cited by 4 publications

References 25 publications

Spatiotemporal analysis of the runaway distribution function based on green function and regularization method

Spatiotemporal analysis of the runaway distribution function based on green function and regularization method

Длительность Пучка Убегающих Электронов При Субнаносекундном Фронте Импульса Напряжения

Duration of runaway electron current pulses when applying voltage pulses with a subnanosecond rise time

Contact Info

Product

Resources

About