| Paper |
Title |
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| THPMN031 |
Experiment of X-Ray Source by 9.4 GHz X-Band Linac for Nondestractive Testing System
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2781 |
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- T. Natsui, K. Dobashi, M. Uesaka, T. Yamamoto
UTNL, Ibaraki
- M. Akemoto, S. Fukuda, T. Higo, N. Kudoh, T. T. Takatomi, M. Yoshida
KEK, Ibaraki
- F. Sakamoto, A. Sakumi
The University of Tokyo, Nuclear Professional School, Ibaraki-ken
- E. Tanabe
AET Japan, Inc., Kawasaki-City
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We are developing a compact X-ray source for Nondestractive Testing (NDT) system. We aim to develop a portable X-ray NDT system by 950 keV X-band linac to realize in-site inspection. Our system has 20 kV electron gun, and accelerate electron beam to 950 keV with 9.4 GHz X-band linac. RF source of this system is 250kW magnetron. Our target spot size and spatial resolution are 1mm. We adopted APS (Alternative Periodic Structure) tube of pi/2 mode for easy manufacturing. It is difficult to realize a high-shunt-impedance for low-energy-cells, which attributes to manufacturing problems. Instead, we use three pi-mode cavities there. Further, we choose the low power magnetron for small cooling system and the low voltage electron gun for small power supply. For the stability of the X-ray yield the system include the Auto Frequency Control (AFC), which detect and tune the frequency shift at the magnetron. We have also performed X-ray generation calculation by the Monte Carlo code of GEANT and EGS to confirm the X-ray source size. We are going to construct the whole system and verify it experimentally. Updated results are presented at the spot.
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| THPMN035 |
Pinpoint keV/MeV X-ray Sources for X-ray Drug Delivery System
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2793 |
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- M. Uesaka, F. Sakamoto, A. Sakumi
The University of Tokyo, Nuclear Professional School, Ibaraki-ken
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X-ray Drug Delivery System (DDS) is the most advanced radiation therapy coming after IMRT (Intensity Modulated Radiation Therapy) and IGRT (Image Guided). DDS uses advanced nano-scaled polymers which contain and deliver drug or contrast agent to cancers without side effects. Several X-ray DDS poses high-Z atoms like Pt and Au to absorb X-rays effectively and used as contrast agent for inspection. Moreover, they have radiation enhancement effect by emission of Auger electron and successive characteristic X-rays. The enhancement factor off Pt and Au is more than five. This can be used for therapy. This new modality must be very important for inspection and therapy of deep cancers. We are making use of our Compton scattering monochromatic keV X-ray source and MeV linac aspinpoint keV/MeV X-ray sources for the purpose. Physical analysis and evaluation of the contrast efficiency and radiation enhancement of the X-ray DDS are under way. Furthermore, a new compact X-band linac with a multi-beam klystron for a pinpoint X-ray source is proposed and designed. Updated research status and result are presented.
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| THPMN033 |
Commissioning a Cartridge-Type Photocathode RF Gun System at University of Tokyo
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2787 |
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- A. Sakumi
UTNL, Ibaraki
- Y. Muroya, T. Ueda, M. Uesaka
The University of Tokyo, Nuclear Professional School, Ibaraki-ken
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We have been developing a compact-sized cartridge-type cathode exchanging system installed in BNL-type IV photocathode RF gun. We can replace a cathode without breaking the vacuum of RF gun, so that a high quantum efficiency photocathode is not surrounded by oxygen or moisture. The advantage of this system can be controlled the quality of the each cathode by making cathode plugs in a factory. Moreover we can easily change a cathode material, such as visible light driven cathode (AgOCs NaK2Sb) the high QE cathode(Cs2Te) for high brightness beam, metal cathode(Mg) for ultra-fast phenomena. Therefore we can investigate characterization of variable cathode materials in high gradient electric field of ~100MV/m. The cavity with the exchanging port and the beam trajectory is calculated by superfish and GPT, respectively. We found that the parameters of the cavity with a plug is almost same compared with normal back plate. Using this system, we can investigate the cathode material and deliver the stable electron beam by one RF gun.
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