| Paper | Title | Page |
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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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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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