Tuning device for receiving coil, cryogenic probe, and magnetic resonance device

A magnetic resonance device, including a cryogenic probe, wherein the cryogenic probe includes a receiving coil and a tuning device for the receiving coil, and the tuning device for the receiving coil comprises:

• a fixed capacitor, a varactor assembly, and a control assembly;
• wherein
• the control assembly is configured to perform a tuning operation on the receiving coil by controlling a capacitance value of the varactor assembly, the tuning operation including at least one of the frequency tuning or the impedance tuning;
• the fixed capacitor includes a first fixed capacitor and a second fixed capacitor, and the varactor assembly includes a first varactor assembly and a second varactor assembly;
• the first varactor assembly and the first fixed capacitor being configured to achieve a frequency tuning on the receiving coil;
• the second varactor assembly and the second fixed capacitor being configured to achieve an impedance tuning on the receiving coil;
• and
• the combination of the first varactor assembly and the first fixed capacitor, the combination of the second varactor assembly and the second fixed capacitor, and the receiving coil are connected in series.