Nuclear Techniques ›› 2016, Vol. 39 ›› Issue (5): 50203-050203.doi: 10.11889/j.0253-3219.2016.hjs.39.050203

• LOW ENERGY ACCELERATOR, RAY AND APPLICATIONS • Previous Articles     Next Articles

Development of a 14-MeV dual-mode congeneric mid-energy accelerating structure for medical electron linear accelerator

SONG Ruiying, HE Shoubo, WANG Peng   

  1. Shanghai United Imaging Healthcare Co., Ltd, Shanghai 201807, China
  • Received:2016-03-30 Revised:2016-04-15 Online:2016-05-10 Published:2016-05-12
  • Supported by:

    Supported by Shanghai Zhangjiang National Innovation Demonstration Zone of the Special Development Fund(No.201505-JD-B108-010)

Abstract:

Background: A dual-mode congeneric mid-energy accelerating waveguide for medical electron linac is a crucial device in imaging guided radiation therapy(IGRT) technology. Purpose: To ensure the linac producing stable and high quality beam bunches for both imaging and treatment beams, a 14-MeV side-coupled standing wave waveguide accelerator structure for medical accelerator based on a novel microwave energy switch technology was developed in Shanghai United Imaging Healthcare Co., Ltd(UIH). Methods: First of all, the designs on the transverse focusing and the longitudinal bunching for the linac accelerating structure were generated using the beam dynamics simulation code Parmela to certify the optimization goal of the accelerating cavity structure which can be used in both dual-photon mode and multi-energy electron mode. Then the accelerating structure was designed and the optimized microwave parameters were obtained by using the electromagnetic code Superfish and the commercial software CST(Computer Simulation Technology). Results: A 1.3-m long π/2 mode standing-wave bi-periodic side-coupled accelerating wave-guide resonating at 2.998GHz was obtained. The accelerating structure can be adjusted to output both 3-MV imaging photon beam and dual-mode treatment photon beams, including 6-MV and 10-MV electron beam. In addition, multi-energy electron beams with maximum electron beam energy of 14MeV can be achieved. Conclusion: So far, the accelerating waveguide was machined and brazed completely. It is found that the numerical design shows very good agreement with the microwave cold test result. Recently, the frequency tuning is achieved accurately and the RF conditioning is in progress.

Key words: Medical mid-energy linac, Energy switch, IGRT, Imaging beam, High dose rate

CLC Number: 

  • TL274+.2