Method for improving service life of magnetron

A method for improving service life of a magnetron, comprising:

• adopting a control device, an experimental magnetron and a working magnetron;
• wherein the experimental magnetron comprises a cathode filament (1), a an anode (2) matching with the cathode filament (1), an electromagnet (3), a cathode power supply (4), an anode negative high-voltage power supply (5) and a magnetic field power supply (6);
• wherein the cathode power supply (4) is used for heating the cathode filament (1);
• the anode negative high-voltage power supply (5) is used for providing the anode voltage, so that the anode (2) and the cathode filament (1) are arranged to generate an electric field;
• the magnetic field power supply (6) is used for providing the coil of the electromagnet (3) with a magnet coil current, in such a manner that the electromagnet (3) generates a magnetic field of an orthogonal electric field;
• the control device comprises an anode current measuring part (7) for measuring anode current, an anode negative high voltage measuring part (8) for measuring anode voltage;
• a coil current measuring unit (9) for measuring magnet coil current, an anode negative high voltage control unit (10) for changing anode voltage, a coil current control unit (11) for changing magnet coil current, and a temperature measuring unit (12) for measuring a temperature of the cathode filament (1);
• wherein the method specifically comprise steps of:
• step (1):
• setting experimental magnetron target output power to be P0, working voltage range of the anode (2) in a range of Umin-Umax, and magnet coil working current to be in a range of Imin-Imax;
• step (2):
• taking n voltage values U1, U2 . . . Un forming an arithmetic progression from the working voltage range Umin˜Umax of the anode (2), wherein U1=Umin, Un=Umax;
• step (3):
• taking a first voltage value in the arithmetic sequence as the anode voltage Ui;
• step (4):
• by the anode negative high voltage control part (10), controlling the anode negative high voltage power supply (5) to provide the anode voltage for Ui, and reading the anode voltage value by the anode negative high voltage measuring part (8);
• step (5):
• when the anode negative high voltage measuring unit (8) reads the anode voltage as Ui, controlling the magnetic field power supply (6) by the coil current control unit (11) to adjust the magnet coil current between Imin and Imax;
• reading the magnet coil current value Ic in real time by the coil current measuring unit (9);
• reading the anode current value Ia in real time by the anode current measuring section (7);
• according to the anode current value Ia and the anode voltage value Ui, when the experimental magnetron output power P is calculated to be equal to P0, performing step (6);
• if the output power P of the experimental magnetron is not equal to P0, then performing step (7);
• step (6):
• by the temperature measuring part (12), measuring the temperature of the cathode filament (1) as Ti;
• and recording the anode voltage value Ui and the magnet coil current value Ic when the experimental magnetron output power P is equal to P0;
• step (7):
• if Ui is not a last value of the arithmetic sequence, performing step (8);
• otherwise performing step (9);
• step (8):
• taking a voltage value of a next digit of Ui in the arithmetic sequence as Ui, and performing step (4);
• step (9):
• adopting the temperature measuring unit (12) to measure the temperature Ti of all the cathode filaments (1), and taking Ti as the temperature data set corresponding to P0;
• taking out a minimum temperature value Tmin in the temperature data set, an anode voltage value and a current value of the magnet coil corresponding to Tmin;
• step (10):
• taking the anode voltage value and the current value of the magnet coil corresponding to Tmin obtained in step (9) as the anode voltage value and the magnet coil current value with the output power of the working magnetron being P0.