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Development of 2D Microwave Driven Photonic Crystal Accelerating Structure

Author: LiZhiPing
Tutor: WuCongFeng
School: University of Science and Technology of China
Course: Nuclear Technology and Applications
Keywords: PBG Accelerating structure High gradient acceleration Damping of high -order mode Coupler Tuning
CLC: TL503.2
Type: Master's thesis
Year: 2009
Downloads: 34
Quote: 0
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Abstract


The research content of this article is the X -band metal photonic crystals (PBG structures ) traveling wave accelerating structure design and experimental studies . PBG structure is characterized by its own photonic bandgap , it can prohibit the spread of electromagnetic waves of frequency in the range of photonic bandgap PBG structure . Among them , the two-dimensional metal PBG structure because it can be used to wakefield damping acceleration structure is introduced into the accelerating structure designs . The wakefield affect the beam transport and even destroy harmful patterns of the beam to effectively suppress wake field is very important . According triangular array of metal PBG global photon the bandgap diagram analysis of this structure constraints master mold , inhibition of the condition of the dipole mode . X-band PBG resonant single-chamber design and production on this basis , to explore and improve the machining of metal PBG structure , the cavity Q values ??from the previous 800 to 3800 , for the production of multi-cavity traveling wave accelerating structure provided the conditions . For high-order mode the effective damping PBG accelerating structure , and offered to open up the the PBG structures sidewall and the outermost part of the metal rods replaced with the SiC rods absorb material . Theoretical calculations show that this way can effectively elicit and absorb TM11 dipole mode , acceleration mode less impact on the TM01 . The X-band metal PBG traveling wave accelerating structure design , including the two parts of the acceleration unit and coupling unit . Taking into account the impact of the short - range tail FET , to accelerate the structural design of group velocity is higher than ordinary acceleration waveguide group velocity 0.04C . Due to the characteristics of the PBG structure , its coupler design than traditional disk -loaded waveguide structure more complex, traditional disk -loaded waveguide coupler design method is no longer applicable in the PBG structure . In this paper, based on the \design . Domestic metal PBG line with coupler wave accelerating structure of the experimental results obtained for the first time , the experimental results and the theoretical calculation is basically consistent . Near the operating frequency , the acceleration mode in Bo Bida to 1.06 . Further experimental studies to be carried out . Subject to the National Natural Science Foundation of China ( 10675116 and 10375060 ) funded .

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CLC: > Industrial Technology > Nuclear technology > Accelerator > General issues > Accelerator structure and manufacturing process > RF system (accelerating system)
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