Jin Qingxiu

A portable X-band on-axis standing wave linac structure

A portable X-band on-axis standing wave electron linear accelerating structure has been developed that is suitable for portable radiation therapy and radiography. The phase-focusing technique is used. The design parameters of a 2 MeV, X-band, on-axis coupled, SW accelerating guide operated in the /spl pi//2 mode is described. A prototype 150 mm long structure has been machined, brazed and sealed, and the experimental data of the cold tests and beam tests are presented.

Diagnosis of individual cell frequencies in a coupled cavity chain without introducing objects into the cavity

In this paper, a new method that can diagnose the cell frequencies in a cavity without a perturbing probe is presented. The cell frequencies and couplings between cells are estimated in terms of the measured pass-band performance. This method will simplify the tuning processes and make the tuning of a sealed cavity possible. It has been well checked with some numerical examples.

14 MeV single-section SW guide for medical accelerators

A 14 MeV, on-axis coupled, S-band waveguide for medical accelerators was built and tested between 1993 and 1995. The accelerator design, the results of cold and hot tests and the beam performance are given in this paper.