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Using Finite Difference Method (FDM), an equation for the potential distribution on the cross-section of annular beam was deviated. By comparing the potential with and without space charge in consideration, the fact that space-charge impact can't be ignored for intense relativistic electron beams can be easily proved. Besides, the potential and electrical field distribution in actual situation will...
The sheet electron beam focused by periodic cusped magnetic (PCM) focusing structure could transport more stable than uniform magnetic field because of diocotron instability. We simulated, fabricate and test a w sheet electron beam klystron with multi-gaps extended interaction cavities. To obtain particular intensity of magnetic field, two pieces of PCM focusing structure had a short distance, and...
This paper presents a new type of klystron, in which multiple sector-ring beam, coaxial beam tunnel with isolated gates, and coaxial RF circuit are adopted to facilitate an excellent all-round performance. A multiple sector-ring beam gun is designed, and the beam characters under various magnetic fields are analyzed.
A novel type klystron using sector-ring multiple beam (SRMB) is analyzed in this paper. The SRMB klystron is improved from the conventional multiple beam klystron (MBK) and annular beam klystron (ABK). It has the advantages of both of the two types. In this paper, the SRMB electron gun was simulated and analyzed using two different software, CST and CHIPIC. This paper gives the design of the SRMB...
Based on single-particle model, the propagation of hollow beam electronics was analyzed by calculating the outer electronic motion equation. In the condition without the magnetic field, the relation of the radial motion depending on beam radius and voltage values was indicated and the physical reason was addressed. In this paper, the motion equation of outer electrons was deviated to explain the influence...
This paper presents an All-in-one simulation method for klystron. The simulation results compared with conventional simulation results are also presented. Conventional simulation method calculates the klystron in part. The electron gun, beam-wave interaction and the collector are designed respectively, and thus the simulation results are inauthentic commonly. The All-in-one simulation method uses...
This paper presents the simulation study of a C band klystron with a disc-load waveguide traveling wave output structure. The electron gun with a perveance of 1.5μp is designed. A 3-cell disc-loaded waveguide output structure working at π/2 mode is adopted in the circuit design. The beam-wave interaction system with disc-loaded waveguide output structure is simulated by PIC code. More than 50MW output...
The Development of the 10MW L-band multi-beam klystron was started in the Institute of Electronics, Chinese Academy of Sciences (IECAS) three years ago. The electrical and structural designs for this klystron have been accomplished, in which many technical problems have been resolved. In the design of electron optical system, the uniform field multiple-lens focusing scheme was adopted, by which the...
In China, the R&D of high peak power klystron has been made much progress in recent years. In 2010, the Institute of Electronics, Chinese Academy of Sciences (IECAS) has successfully developed S-band 100MW klystron, and, currently, are developing an S-band 150MW klystron. The Institute of High Energy Physics, Chinese Academy of Sciences (IHEP) cooperated with the Hang Guang Electrical Factory...
In this paper, the design of input and output cavity for X-band sheet beam klystron was presented. The fabrication and cold test of a barbell cavity were conducted, and the cavity characteristics were predicted by both CST simulation and measurement.
A coaxial output cavity with reentrant ring and short circuit pole for multiple-beam klystron (MBK) is presented, which can increase the frequency interval between operating mode TM310 and neighboring modes to more than 1.0 GHz in X-band, diminish the external Q-factor from 535.4 to 202.2, and make the field distribution of TM310 mode symmetrical enough. The simulation results are obtained by CST-MWS.
This paper presents the design and experimental results of the electron optics system for use in an S-band 100-MW high-peak-power klystron. The gun operating voltage is 415 kV with a beam current of 535 A. For the design of the gun, special emphasis is placed on the geometric layout of the electrodes to ensure a moderate voltage gradient, reasonable cathode loading, and accurate beam perveance. The...
In this paper, by means of a 3D particle-in-cell (PIC) code, the non-linear calculation of beam-wave interaction in periodic cusped magnetic (PCM) field is presented for the X-band sheet beam klystron with five three-cell, extended interaction cavities. The simulation results show that the output peak power is more than 32.4 MW, with the interaction efficiency of more than 31.2%, and the gain of more...
A spurious-mode-suppressing method is introduced in this paper, aiming at increasing frequency interval between operating mode (TM310 mode) and spurious mode (TM020 mode). By means of CST-MWS, we find that the frequency interval can be increased 0.65 GHz in X-band by the method.
The Institute of Electronics, Chinese Academy of Sciences (IECAS) is developing an S-band 100 MW klystron for linear accelerators. The klystron has five-cavities, including a double-gap 2pi-mode output cavity. The output section consists of a cavity with double gaps and one output waveguide. To date two prototypes were fabricated. Unfortunately, the first one was suffered from leaking on the edge...
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