F.;
loffe;
Institute;
Russian;
Academy;
of;
Sciences;
Saint;
Petersburg;
194021;
Russia;
Research;
University;
Information;
Technologies;
Mechanics;
and;
Optics;
Saint-Petersburg;
197101;
Laboratory;
High;
Magnetic;
Fields;
Low;
Temperatures;
Wroclaw;
53421;
Poland;