On-site real-time inspection system for pump-impeller using X-band linac X-ray

Tomohiko Yamamoto, Takuya Natsui, Hiroki Taguchi, Yoshihiro Taniguchi, Ki Woo Lee, Eiko Hashimoto, Fumito Sakamoto, Akira Sakumi, Noritaka Yusa, Mitsuru Uesaka, Naoki Nakamura, Masashi Yamamoto, Eiji Tanabe

Research output: Contribution to journalConference articlepeer-review


The methods of nondestructive testing (NDT) are generally ultrasonic, neutron, eddy-current and X-rays, NDT by using X-rays, in particular, is the most useful inspection technique having high resolution. We can especially evaluate corroded pipes of petrochemical complex, nuclear and thermal-power plants by the high energy X-ray NDT system. We develop a portable X-ray NDT system with X-band linac and magnetron. This system can generate a 950keV electron beam. We are able to get X-ray images of samples with 1 mm spatial resolution. This system has application to real time impeller inspection because linac based X-ray sources are able to generate pulsed X-rays. So, we can inspect the rotating impeller if the X-ray pulse rate is synchronized with the impeller rotation rate. This system has application in condition based maintenance (CBM) of nuclear plants, for example. However, 950keV X-ray source can only be used for thin tubes with 20 mm thickness. We have started design of a 3.95MeV X-band linac for broader X- ray NDT application. We think that this X-ray NDT system will be useful for corrosion wastage and cracking in thicker tubes at nuclear plants and impeller of larger pumps. This system consists of X-band linac, thermionic cathode electron gun, magnetron and waveguide components. For achieving higher electric fields the 3.95 MeV X-band linac structure has the side-coupled acceleration structure. This structure has more efficient acceleration than the 950 keV linac with alternating periodic structure (APS). We adopt a 1.3 MW magnetron for the RF source. This accelerator system is about 30cm long. The beam current is about 150 mA, and X-ray dose rate is 10 Gy@lm/500 pps. In this paper, the detail of the whole system concept and the electromagnetic field of designed linac structure will be reported.

Original languageEnglish
Pages (from-to)95-98
Number of pages4
JournalAIP Conference Proceedings
Publication statusPublished - 2009
Event20th International Conference on the Application of Accelerators in Research and Industry, CAARI 2008 - Fort Worth, TX, United States
Duration: 2008 Aug 102008 Aug 15


  • Condition based maintenance
  • On-site real-time imaging
  • Pump-impeller
  • X-band linac


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