Author Affiliations +
Eugene A. Vishnyakov,1 Igor A. Kopylets,2 Valeriy V. Kondratenko,2 Alexey O. Kolesnikov,1,3 Alexey N. Shatokhin,1,3 Evgeny N. Ragozin1
1P.N. Lebedev Physical Institute (Russian Federation)
2Kharkiv Polytechnical Institute (Ukraine)
3Moscow Institute of Physics and Technology (Russian Federation)