Runaway electrons and x-ray emission in air and other gases during discharges with long rise time of voltage pulses

2019 ◽  
Author(s):  
Alexander Burachenko ◽  
Cheng Zhang ◽  
Victor Tarasenko ◽  
Tao Shao ◽  
Evgenii Baksht ◽  
...  
Keyword(s):  
Rise Time ◽  
Runaway Electrons ◽  
X Ray ◽  
Voltage Pulses

Development of a hard X-ray detector for measuring continuous spectra generated by runaway electrons in VEST

2021 ◽  
Vol 170 ◽  
pp. 112522
Author(s):  
Soobin Lim ◽  
Jonggab Jo ◽  
Changwook Koo ◽  
Sung-Joon Ye ◽  
Kyoung-Jae Chung ◽  
...  
Keyword(s):  
Runaway Electrons ◽  
X Ray

scholarly journals Observations of X-rays from Laboratory Sparks in Air at Atmospheric Pressure under Negative Switching Impulse Voltages

Atmosphere ◽  
2019 ◽  
Vol 10 (4) ◽  
pp. 169 ◽  
Author(s):  
Mahbubur Rahman ◽  
Pasan Hettiarachchi ◽  
Vernon Cooray ◽  
Joseph Dwyer ◽  
Vladimir Rakov ◽  
...  
Keyword(s):  
Rise Time ◽  
Atmospheric Pressure ◽  
Opposite Polarity ◽  
X Rays ◽  
X Ray ◽  
Impulse Voltage ◽  
First Time ◽  
Switching Impulses ◽  
Low Rate

We present observations of X-rays from laboratory sparks created in the air at atmospheric pressure by applying an impulse voltage with long (250 µs) rise-time. X-ray production in 35 and 46 cm gaps for three different electrode configurations was studied. The results demonstrate, for the first time, the production of X-rays in gaps subjected to switching impulses. The low rate of rise of the voltage in switching impulses does not significantly reduce the production of X-rays. Additionally, the timing of the X-ray occurrence suggests the possibility that the mechanism of X-ray production by sparks is related to the collision of streamers of opposite polarity.

Subnanosecond rise time of high voltage pulses in ferrite loaded coaxial line

2008 ◽  
Author(s):  
Oleg B. Kovalchuk ◽  
Viktor O. Kutenkov ◽  
Ilya V. Romanchenko ◽  
Vladislav V. Rostov
Keyword(s):  
High Voltage ◽  
Rise Time ◽  
Coaxial Line ◽  
Voltage Pulses

Progress in HXR diagnostics at GOLEM and COMPASS tokamaks

2022 ◽  
Vol 17 (01) ◽  
pp. C01033
Author(s):  
J. Cerovsky ◽  
O. Ficker ◽  
V. Svoboda ◽  
E. Macusova ◽  
J. Mlynar ◽  
...  
Keyword(s):  
Diagnostic Tool ◽  
Runaway Electron ◽  
Sampling Rate ◽  
Data Acquisition System ◽  
Scintillation Detectors ◽  
Low Density ◽  
Runaway Electrons ◽  
X Ray ◽  
Radiation Induced ◽  
Pulse Analysis

Abstract Scintillation detectors are widely used for hard X-ray spectroscopy and allow us to investigate the dynamics of runaway electrons in tokamaks. This diagnostic tool proved to be able to provide information about the energy or the number of runaway electrons. Presently it has been used for runaway studies at the GOLEM and the COMPASS tokamaks. The set of scintillation detectors used at both tokamaks was significantly extended and improved. Besides NaI(Tl) (2 × 2 inch) scintillation detectors, YAP(Ce) and CeBr3 were employed. The data acquisition system was accordingly improved and the data from scintillation detectors is collected with appropriate sampling rate (≈300 MHz) and sufficient bandwidth (≈100 MHz) to allow a pulse analysis. Up to five detectors can currently simultaneously monitor hard X-ray radiation at the GOLEM. The same scintillation detectors were also installed during the runaway electron campaign at the COMPASS tokamak. The aim of this contribution is to report progress in diagnostics of HXR radiation induced by runaway electrons at the GOLEM and the COMPASS tokamaks. The data collected during the 12th runaway electron campaign (2020) at COMPASS shows that count rates during typical low-density runaway electron discharges are in a range of hundreds of kHz and detected photon energies go up to 10 MeV (measured outside the tokamak hall). Acquired data from experimental campaigns from both machines will be discussed.

Rise Time of Hard X-Ray Bursts

1975 ◽  
pp. 237-238
Author(s):  
Joan Vorpahl ◽  
Tatsuo Takakura
Keyword(s):  
Rise Time ◽  
X Ray
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