| Paper |
Title |
Page |
| MOP005 |
Beam Dynamics for Intense L-band Electron Linac
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37 |
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- S. H. Kim, M.-H. Cho, S.-I. Moon, W. Namkung, B. Park
POSTECH, Pohang, Kyungbuk
- J.-S. Oh
PAL, Pohang, Kyungbuk
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We are now developing an intense L-band electron linac with a traveling-wave accelerating structure for irradiation applications. It is capable to produce 10 MeV electron beams of 30 kW by a pulsed klystron of 25 MW with a 60 kW average power. Bunching and accelerating cavities operated with 2π/3 mode at 1.3 GHz are designed by the SUPERFISH code. Focusing solenoids are designed by the POISSON code. Using electromagnetic field configurations obtained by these codes, a simulational study on the beam dynamics is conducted by the PARMELA code. As results, the beam envelope supports a transmission efficiency over 91% with the E-gun current of 1.6 A.
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| TUP004 |
Intense L-Band Electron Linac for Industrial Applications
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250 |
| |
- B. Park, M.-H. Cho, S. H. Kim, S.-I. Moon, W. Namkung
POSTECH, Pohang, Kyungbuk
- J.-S. Oh, S. J. Park
PAL, Pohang, Kyungbuk
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An intense L-band travelling-wave electron linac is under development for irradiation applications. It is capable of producing 10 MeV electron beams of 30 kW average beam power. The operating energy is limited to prevent neutron production. On the other hand, the current is limited by the beam loading effect in the given structure. The accelerating structure operated with 2π/3 mode is constant-impedance and disk-loaded waveguides. We determined the optimum operating parameters by adjusting the duty factor, which is again governed by the available high-power pulsed klystron. The SUPERFISH code was used to design the bunching and accelerating cavities. The PARMELA code gives the result of beam dynamics. We present design details of the intense travelling-wave linac powered by a 1.3 GHz, 25 MW pulsed klystron with a duty factor of 0.21%. We also present cold test results for the prototype cavities.
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| THP025 |
R&D of the Long-Life Thyratron Tube
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622 |
| |
- H. Matsumoto
KEK, Ibaraki
- J.-S. Oh
PAL, Pohang, Kyungbuk
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Long lifetime over 50k hours for the thyratron is essential to provide the reasonable availability of the accelerator such as X-FEL and future e+e- linear collider. The lifetime and reliability of a solid-state device are not well confirmed yet. There are some examples that show long life of a thyratron. Many thyratrons were dead due to several common causes related to circuits and operation environment rather than intrinsic problems of a device itself. Several valuable feedback systems are easily adopted to enhance the lifetime. There are still unidentified questions to be verified in the thyratron. Close collaboration between laboratories and companies is strongly requested in order to improve the lifetime and performance of a thyratron.
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