Multi-mode tuning method for medical cyclotrons
A cyclotron and resonant frequency technology, which is applied in the direction of magnetic resonance accelerators, accelerators, electrical components, etc., can solve problems such as low time utilization efficiency, inability to realize radio frequency system tuning function, and reduced radio frequency power utilization efficiency, so as to improve the whole machine The effect of time efficiency
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[0019] Example 1
[0020] This medical cyclotron radio frequency low-level system tuning loop adopts multi-state tuning. After the system is powered on, the radio frequency signal changes from pulse to continuous state, and the power is increased to the required working voltage to reach the amplitude closed loop. The setting of the operating point voltage needs to be calibrated on site. When the cavity operating frequency is in resonance, adjust the operating point voltage based on the error signal as zero; the proportional integral parameters in the digital signal processor calculation also require online training. First, only the proportional parameters are used. , Set the integral parameter to zero, increase the proportional parameter until the overshoot oscillation occurs, then reduce the proportional parameter to 90%, and set the integral parameter to 0.001, based on the value of this group of parameters, optimize to ±10% best value. After the system turns into a continuo...
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[0023] Example 2
[0024] The method and principle are the same as in embodiment 1, except that the timer is set to 10 minutes. In the tuning loop test on a high-current cyclotron, it was observed that the stroke of the fine-tuning capacitor plate exceeded the limit trigger signal source adjustment. The adjustment amount was 0.003MHz, the adjustment amount was sufficient for response, and the instantaneous reflection was acceptable.
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