Nuclear Techniques ›› 2016, Vol. 39 ›› Issue (4): 40401-040401.doi: 10.11889/j.0253-3219.2016.hjs.39.040401

• NUCLEAR ELECTRONICS AND INSTRUMENTATION • Previous Articles     Next Articles

Development of pulsed power supply in proton therapy

MIAO Yayun1,2, GU Ming1, CHEN Zhihao1, TONG Jin1   

  1. 1 Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Zhangjiang Campus, Shanghai 201204, China;
    2 University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2016-02-01 Revised:2016-03-07 Online:2016-04-10 Published:2016-04-08
  • Supported by:

    Supported by Independent Innovation and Development of High-tech Industry Project of Shanghai

Abstract:

Background: Proton therapy centers have been operated worldwide recently. The central rationale for proton therapy is its superior spatial dose distribution in the patient. Injection system of synchronous storage ring in Shanghai proton therapy equipment requires two bump magnets. Purpose: Two new pulsed power supplies of the same parameters used in the bump magnet have been proposed and developed. Methods: The principle of pulse forming circuit is that LC series resonance generates when thyristor is turned on by trigger signals. Energy storage capacitor is charged to the setting voltage which determines the amplitude of the pulse waveform based on constant current by charging power supply. The main circuit employs variable inductance to adjust the pulse width. Fast recovery diode in series of thyristor could compensate for the turn-off delay of the thyristor while the peak of reverse current decreases due to saturable inductor. Results: Test results showed that when the half-sineexcitation current peak was set to 3732 A, its trigger jitter and reproducibility were less than ±25 ns and 0.1%, respectively. Reverse current could be reduced to 3.75% of the peak current. Conclusion: Experimental results indicate that the pulse power supply reaches the design requirements and saturable inductor restrains reverse current effectively.

Key words: Proton therapy, Pulsed power supply, LC resonance, Saturable inductor

CLC Number: 

  • TL503.5