Response of HR-GaAs:Cr sensors to subnanosecond X- and β-ray pulses

Chsherbakov, I.; Chsherbakov, P.; Lozinskaya, A.; Mihaylov, T.; Новиков, В. А.; Shemeryankina, A.; Толбанов, О. П.; Tyazhev, A.; Zarubin, A.; Белоплотов, Д. В.; Тарасенко, В. Ф.

doi:10.1088/1748-0221/14/12/c12016

Cited by 6 publications

(6 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In nanosecond gas discharges, REs are often generated in the prebreakdown stage [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28]. They can be measured directly with a collector or by measuring x-ray radiation [29][30][31][32][33][34]. It should be noted that x-ray radiation can be dangerous when processing living tissues with a nanosecond discharge plasma.…”

Section: Introductionmentioning

confidence: 99%

Generation of runaway electrons in plasma after a breakdown of a gap with a sharply non-uniform electric field strength distribution

Белоплотов¹,

Тарасенко²,

Shklyaev³

et al. 2021

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

The paper is devoted to the study of the initiation and formation of a negative streamer in a sharply inhomogeneous electric field and the generation of runaway electrons (REs) in air and helium at atmospheric pressure and below, as well as in sulfur hexafluoride at low pressure. Nanosecond voltage pulses of negative polarity with an amplitude of 18 kV were applied across a point-to-plane gap 8.5 mm long. The studies were carried out using broadband measuring sensors and equipment with picosecond time resolution, as well as using a four-channel ICCD camera. Using a special method for measuring the dynamic displacement current caused by the redistribution of the electric field during streamer formation, the waveforms of voltage, discharge current, RE current, and dynamic displacement current were synchronized to each other, as well as to ICCD images. Data on the generation of REs with respect to the dynamics of streamer formation were obtained. It was found that REs are generated not only during the breakdown of the gap, but also after that. It has been found that the formation time of explosive emission centers affects the generation of REs after breakdown. Based on the measurement data of the voltage, discharge current, and dynamic displacement current, the electron concentration in the plasma channel after breakdown and the electric field strength near the surface of the grounded electrode were calculated.

show abstract

Section: Introductionmentioning

confidence: 99%

Generation of runaway electrons in plasma after a breakdown of a gap with a sharply non-uniform electric field strength distribution

Белоплотов¹,

Тарасенко²,

Shklyaev³

et al. 2021

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

show abstract

“…The X-ray pulse amplitude increased with the generator voltage increased and the gas pressure decreased, as expected. The X-ray pulse duration corresponded to the pulse response of the detector, see the data in [26]. The presence of XR, along with a diffuse discharge formation confirms the generation of runaway electrons.…”

Section: Measurement Of Voltage Discharge Current and X-ray Radiationmentioning

confidence: 81%

“…At idle, their amplitudes doubled. The presence of X-ray radiation from the discharge was measured with an HR-GaAs:Cr X-ray detector, described in [26], which was installed instead of the window after a copper foil 20 microns thick. This X-ray detector with a semiconductor sensor input window diameter of 3 mm had a high sensitivity but the pulse response was about 2 ns.…”

Section: Methodsmentioning

confidence: 99%

Thin Luminous Tracks of Particles from Electrodes with a Small Radius of Curvature in Pulsed Nanosecond Discharges in Air and Argon

Тарасенко¹,

Белоплотов²,

Панченко³

et al. 2023

Preprint

View full text Add to dashboard Cite

Features of nanosecond discharge development in a non-uniform electric field are studied experimentally. High spatial resolution imaging showed that thin luminous tracks of great length with a cross-section of a few microns are observed against the background of discharge glow in air and argon. It has been established that the detected tracks are adjacent to brightly luminous white spots on the electrodes or to the vicinity of these spots, and are associated with the flight of small particles. It is shown that the traces have various shapes and change from pulse to pulse. The particle tracks may look like curvy or straight lines. In some photos, they can change the direction of movement to the opposite. The particle trace was found to abruptly cut off and a bright flash is visible at the trail break point. The color of the tracks differs from that of the spark leaders, while the bands of the second positive nitrogen system dominate in the gap spectra during the existence of a diffuse discharge. Areas of blue light are evident near the electrodes, as well. Development of glow in the gap during its breakdown is revealed using an ICCD camera. Physical reasons for the observed phenomena are discussed.

show abstract

“…At idle, their amplitudes doubled. The presence of X-ray radiation from the discharge was measured with an HR-GaAs:Cr X-ray detector, described in [26], which was installed instead of the window behind a 20-µm-thickness copper foil. This X-ray detector with a 3-mm-diameter semiconductor sensor input window had a high sensitivity but the pulse response was about 2 ns.…”

Section: Methodsmentioning

confidence: 99%

Thin Luminous Tracks of Particles Released from Electrodes with A Small Radius of Curvature in Pulsed Nanosecond Discharges in Air and Argon

et al. 2023

View full text Add to dashboard Cite

Features of the nanosecond discharge development in a non-uniform electric field are studied experimentally. High spatial resolution imaging showed that thin luminous tracks of great length with a cross-section of a few microns are observed against the background of discharge glow in air and argon. It has been established that the detected tracks are adjacent to brightly luminous white spots on the electrodes or in the vicinity of these spots, and are associated with the flight of small particles. It is shown that the tracks have various shapes and change from pulse to pulse. The particle tracks may look like curvy or straight lines. In some photos, they can change their direction of movement to the opposite. It was found that the particle’s track abruptly breaks and a bright flash is visible at the break point. The color of the tracks differs from that of the spark leaders, while the bands of the second positive nitrogen system dominate in the plasma emission spectra during the existence of a diffuse discharge. Areas of blue light are visible near the electrodes as well. The development of glow and thin luminous tracks in the gap during its breakdown is revealed using an ICCD camera. Physical reasons for the observed phenomena are discussed.

show abstract

Response of HR-GaAs:Cr sensors to subnanosecond X- and β-ray pulses

Cited by 6 publications

References 13 publications

Generation of runaway electrons in plasma after a breakdown of a gap with a sharply non-uniform electric field strength distribution

Generation of runaway electrons in plasma after a breakdown of a gap with a sharply non-uniform electric field strength distribution

Thin Luminous Tracks of Particles from Electrodes with a Small Radius of Curvature in Pulsed Nanosecond Discharges in Air and Argon

Thin Luminous Tracks of Particles Released from Electrodes with A Small Radius of Curvature in Pulsed Nanosecond Discharges in Air and Argon

Contact Info

Product

Resources

About