MORPHOLOGY OF DESTRUCTIONS OF SOLID BODIES UNDER IRRADIATION BY A HIGH-CURRENT ELECTRON BEAM IN FILAMENTED AND SELF-FOCUSED MODE
Oleshko Vladimir Ivanovich, V.F. TARASENKO, A.N. YAKOVLEV, V.V. NGUYEN
National Research Tomsk Polytechnic University, Tomsk, Russian Federation
ML
Mikhail Lomaev
2020-09-25 10:36
How do you explain the difference of the time behavior of the current pulses, passing through the holes 0,8 mm and 6 mm in the anode? (Slide No. 17 of presentation).
OV
Author
Oleshko Vladimir Ivanovich
2020-09-25 10:36
Mikhail Lomaev 2020-09-22 19:58
How do you explain the difference of the time behavior of the current pulses, passing through the holes 0,8 mm and 6 mm in the anode? (Slide No. 17 of presentation).
Oscillograms of current pulses from the self-focusing zone (Ф = 0.8 mm) and from the area with a diameter Ф = 6 mm demonstrate an increase in the fraction of low-energy electrons in the self-focusing spot. As for the insignificant change in position by the maximum of the current pulses, this may be due to the complex space-time and energy structure of filamented microbeams generated in the diode in the self-focusing mode.
ML
Mikhail Lomaev
2020-09-25 10:37
What is the basis for the statement that "the duration of individual current pulses is 25 ps and their average repetition rate is 5 GHz"? (Conclusion No.5)
OV
Author
Oleshko Vladimir Ivanovich
2020-09-25 10:37
Mikhail Lomaev 2020-09-22 20:07
What is the basis for the statement that "the duration of individual current pulses is 25 ps and their average repetition rate is 5 GHz"? (Conclusion No.5)
Knowing from the experiment the beam collapse rate (≈ 2 ∙ 108 cm / s; 2 mm per 1 ns) and the morphology of microfractures formed in PMMA when the filamented beam moves from the periphery to the center (the diameter of individual microfractures (≈50 μm) and the average distance between them (≈ 50 μm) (see Slide 16), it is possible to estimate the duration of an electron pulse that forms one micro-destruction (≈ 25 ∙ 10-12 s) and the repetition rate of electron microbeams (5 GHz).
