No. 2, 2021
Assuring Estimation of Radiation Transient Response of Products of Electronic Component Base

A.V. Sogoyan1,2

1National Research Nuclear University “MEPhl”
Moscow, Russia
e-mail: Avsog@spels.ru
2JSC "Experimental Scientific and Production Association SPECIALIZED ELECTRONIC SYSTEMS"
Moscow, Russia

A method is proposed for assuring estimation of the radiation transient response of electronic component base products and test standards, taking into account the amplitude-time characteristics of pulsed radiation, based on the minimum amount of experimental data and information on the shape of the exposure pulse.

Keywords: radiation transient response, optimal control theory, Pontryagin's maximum principle, assuring estimation, test rate.
Research of Electrons, Neutrons and Gamma Rays Effect on the Output Characteristics of Multi-Junction Photoelectric Converters Based on AIIIBV/Ge

M.V. Ryabtseva1,2, A.S. Petrov3, G.S. Voevodkin1,2, K.I. Tapero2,3, N.T. Vagapova1,2,4, M.V. Bankovsky3

1JSC «Scientific and Production Enterprise «Kvant»
Moscow, Russia
e-mail: umc@npp-kvant.ru
2National University of Science and Technology MISiS
Moscow, Russia
3Research Institute of Scientific Instruments
Lytkarino, Moscow Region, Russia
4MIREA - Russian Technological University
Moscow, Russia

The research results of electrons, neutrons and gamma rays effect on the triple photovoltaic converters (PVCs) based on the InGaP/InGaAs/Ge semiconductor structure are presented. It is shown that the degradation curves of photoelectric parameters for various types of irradiation collapse to a single characteristic curve when converting fluence into displacement damage dose. The results obtained can be considered as the basis for predicting the active life of spacecraft solar batteries. The work also considers the degree of degradation of each PVC subcells.

Keywords: photovoltaic converter, AIIIBV semiconductor materials, electrons, neutrons, gamma rays.
Connection of Output Characteristics of Fiber Laser with Parameters of Its Elements when Exposed to Static Radiation

S.M. Dubrovskih, O.V. Tkachev, V.P. Shukailo, A.N. Afanasiev, A.N. Slobozhanin, M.G. Slobozhanina, D.V. Kulakov

FSUE “Russian Federal Nuclear Center – Academician E.I. Zababakhin
All-Russian Research Institute of Technical Physics”
Snezhinsk, Chelyabinsk region, Russia

The study of the effect of static gamma radiation on the characteristics of the main elements of the optical part of a fiber laser: fiber Bragg gratings, active fibers and on the output power of fiber lasers, assembled on the basis of the investigated elements, were conducted. An analysis, based on the balance equations, shows that the rate of decrease in the output power of an uninterruptible fiber laser is determined by the value of radiation-induced losses in the active fiber core and also depends on the length of the active fiber and the reflectance of the output mirror. The obtained simulative representations of the radiation response of a fiber laser make it possible to estimate the radiation sensitivity of the optical part of the entire laser by studying only the active fiber.

Keywords: fiber laser, fiber Bragg grating, radiation induced absorption, exposure dose of gamma radiation.
Measurement Data of Absorbed Ionizing Radiation Dose on Board of Spacecraft

O.V. Meshchurov1, R.G. Useinov1, A.D. Artemov2

1JSC "Research Institute of Scientific Instruments”
Lytkarino, Moscow region, Russia
e-mail: Niip66@bk.ru
2JSC "Kometa Corporation”
Moscow, Russia

The measurement data of absorbed ionizing radiation dose on board of KA1 and KA2 spacecrafts, using the equipment of onboard system of radiation control are presented. The measurement results obtained are different from calculated estimates, conducted before launching space vehicles, using various programs for dose calculation.

Keywords: detector of absorbed dose of space ionizing radiation, equipment of onboard radiation control, spacecraft, high elliptical orbit, effective thickness of confinement, programs for absorbed dose calculation.
Radiation Analysis of Interorbital Transfers of Low Thrust Spacecrafts on Addition of Trip Sections with Electric Propulsion System Off

V.V. Goncharov1, A.N. Zagorkov2, O.V. Mikheev2, A.E. Oshkin2

1Space Systems Research and Development Institute of Khrunichev Space Center
Korolev, Moscow region, Russia
e-mail: niiks@khrunichev.com
2Khrunichev State Research and Production Space Center
Moscow, Russia

The effect of the duration of the interorbital trip areas with low-thrust electric propulsion system (EPS) turned off on the radiation loads, obtained during the transfer of communication space vehicle from low-earth orbit to geostationary orbit, is explored. Radiation loads are compared in scenarios of deorbiting with full-time EPS and with it being interrupted on a time basis, including various periods of solar activity.

Keywords: spacecraft, total radiation dose, interorbital transfer, solar activity, injection scenario, electric propulsion system.

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