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TUPSA047 |
Preliminary Study on Graphene Coated RF Cavity | |
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| Graphene has attracted great interest ever since due to its excellent performance in chemical and physical properties. For the aspect of modern accelerator technology, high beam power and stability are two main concerns. In this paper we will give a preliminary study on graphene coated RF cavities and show some potential advantages related to the graphene coat. Especially for the high electrical conductivity of graphene, it is possible to achieve a CW operation which is comparable to a superconducting machine. Another important character is the low multipacting, which would greatly reduce RF breakdown and improve the stability of the whole system. | ||
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WEPSB043 |
Status of a THz source based on a FEL | |
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| Abstract THz wave have many special performances so that it will be applied in many field. So far there were many kind of THz Source, one of them is based on a FEL that can produce high power (~kW). This paper will describe the design of a THz source based on a FEL which is consists of a LINAC of 14MeV, undulator and a optical resonance cavities. The LINAC was composed of a novel EC-ITC-RF gun, constant gradient travelling wave accelerator with a collinear absorbing load, focusing system, RF power system, beam diagnostic system, vacuum system, control system and so on. The LINAC was installed on November of 2014. Last year, we finished the install of the undulator and the optical resonance cavities. Now the LINAC has been testing and commissioning for THz radiation test. So far, the beam parameters tested of the LINAC are as the following: beam Energy is of 13.58MeV, macro pulse current is of 655mA,μpulse beam current is of 30A, beam macro pulse length is of 1-2's, beam bunch length(μpulse) is of 8ps, energy spread of 0.33% , normal beam emmitance is of 24.1mm.mrad. | ||
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| THPSC003 | The Design of Permenant Magnet Spread System for 0.5 MeV Irradiation Accelerator | 541 |
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Funding: Supported by Natural Science Foundation (11505068) The traditional electron beam scanning magnet has many disadvantages, for example, the regulatory of excitation current is very complex and the irradiation uniformity as well as the irradiation area is very difficult to improve and expand. Thus the author of the paper proposes an innovative technology of a permanent magnet spread system for 10 MeV irradiation accelerator which uses a special configuration of the magnetic field to spread electron beam bunch directly and would remarkably improve the spread uniformity, simplify the accelerator and would be helpful to protect the titanium window and expand the irradiation area. Also, the technology could as well be used on the electron beam irradiation of those irregular structured objects of large size. |
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| THPSC037 | Loss Analysis of Insulated Core Transformer High Voltage Power Supply | 620 |
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| Insulated core transformer (ICT) electron accelerator is an ideal prototype in low energy radiation processing industry, and ICT high voltage power supply is the essential apparatus. Conventional ICT high voltage power supply uses laminated silicon steel sheets as magnetic cores and works at 50 Hz. In a novel design of the ICT high voltage power supply, the magnetic cores made of ferrite material are adopted to increase the frequency and improve the performance. Focusing on the new scheme, the loss calculation of the high voltage power supply was carried out. The loss of ferrite magnetic cores and the windings was analysed and simulated. | ||
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| THPSC038 | A Novel Design of Insulated Core Transformer High Voltage Power Supply | 623 |
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| Insulated core transformer (ICT) high voltage power supply is an ideal model for industrial radiation accelerator at energy below 1MeV. Compared to the traditional scheme, a novel ICT high voltage power supply was put forward. Conventional silicon steel sheets were replaced with manganese zinc ferrites, raising working frequency from 50Hz to thousand hertz. Magnetic structure was changed from three-phase structure to four-phase structure. Accordingly, excitation voltage was changed from three-phase sinusoidal wave to square wave. Polyimide was chosen as insulation material instead of teflon or mica. A prototype of 400kV/50mA was designed, simulated and verified with the aid of finite element analysis software. To optimize the voltage distribution, corresponding flux compensation methods were raised to solve the problem of flux leakages. | ||
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THPSC044 |
Beam transfer line alignment and tuning for the HUST THz-FEL | |
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| A compact FEL oscillator is constructed to provide THz radiation through 30um to 300um in Huazhong University of Science and Technology (HUST). This project is proposed to produce a type of cost-effective THz source with table-top scale for civil use. So that, besides high performance, an extreme compact layout has been pursued in design and system assembly, by compressing beam line elements and simplifying diagnostic system under the premise of sufficient accuracy. Which means some obstacles come out in beam commissioning, such as inadequate online observation and tuning manners. This paper describes the assembly scheme and beam diagnostic methods for the HUST THz-FEL prototype, reports how to implement beam-based alignment for the transfer line and gives experiment results respectively. | ||
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THPSC045 |
Localisation of RF Breakdown Point in a Coaxial Load Linac Structure | |
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| A compact terahertz free electron laser (THz-FEL) prototype has been built up in Huazhong University of Science and Technology (HUST). In the prototype, a 0.85m long linac was designed to deliver electron beams with maximum energy of 14MeV and coaxial absorbing load instead of output coupler was selected to achieve a compact structure. In this case, no transmitted power signal could be used to determine the RF breakdown point (RFBP) in the linac cavity. Here we reported how the RFBP can be localized with just the input and reflected power signals through two methods. One refers to the analysis of time delay of the two signals and the other refers to the calculation of amplitude of the two signals. Quantitative analysis showed the two methods were well consistent with each other and indicated the RFBP located at the end of the linac cavity. | ||
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