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Ferrite absorber for absorbing high-order mode of high-frequency cavity and preparation method thereof

A ferrite and high-frequency cavity technology, applied in the field of ferrite absorber and its preparation, can solve problems such as affecting beam stability and beam oscillation loss, so as to improve stability, prevent performance deterioration, and avoid changes Effect

Active Publication Date: 2014-10-29
GRIMAT ENG INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] With the continuous increase of the current intensity of CESR, KEKB and BEPCII accelerators, the high-order mode field excited by the beam in the high-frequency cavity will also increase. If it is not fully absorbed and attenuated, it will Affect the stability of the beam, and even cause the loss of beam oscillation

Method used

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  • Ferrite absorber for absorbing high-order mode of high-frequency cavity and preparation method thereof
  • Ferrite absorber for absorbing high-order mode of high-frequency cavity and preparation method thereof
  • Ferrite absorber for absorbing high-order mode of high-frequency cavity and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0034] The ferrite powder is prepared by the powder solid state reaction method of the present invention, and the ferrite powder has a molecular chemical formula of Ni 0.4 Zn 0.4 co 0.2 Fe 2 o 4 ferrite powder. Among them, respectively weigh 3194.0g Fe 2 o 3 , 597.6g NiO, 651.0g ZnO and 299.7g CoO raw powder, mixed and sieved the raw powder by ball milling to obtain 4740g of mixed powder. The sieved powder was put into a muffle furnace for pre-sintering at 950°C for 2h. Then complete the preparation of the ferrite absorber according to the subsequent steps (2)-(6) in the technical solution of the present invention. Among them, the sintered powder is treated in the ball mill mixer for 4 hours for the second ball milling; 5wt% PVA aqueous solution is used as the forming agent; the weight ratio of ferrite powder: forming agent = 100:5 is mixed and granulated, and pressed Form a cylindrical ferrite body; raise the temperature in the air at a rate of 0.8°C / min, and keep the...

Embodiment example 2

[0037] The ferrite powder is prepared by the powder solid state reaction method of the present invention, and the ferrite powder has a molecular chemical formula of Ni 0.6 Zn 0.3 co 0.1 Fe 2 o 4 ferrite powder. Among them, respectively weigh 3194.0g Fe 2 o 3 , 896.4g NiO, 488.3g ZnO and 149.9g CoO raw powder, mixed and sieved the raw powder by ball milling to obtain 4725g of mixed powder. The sieved powder was put into a muffle furnace for pre-sintering at 900°C for 2h. Then complete the preparation of the ferrite absorber according to steps (2) to (6) in the technical solution of the present invention. Among them, the sintered powder is treated in the ball mill mixer for 5h for the second ball milling; 6wt% PVA aqueous solution is used as the forming agent; according to the weight ratio of ferrite powder:forming agent=105:10, it is mixed and granulated, and pressed Form a cylindrical ferrite green body; heat up at a rate of 0.5°C / min in the air, and hold at 400°C for ...

Embodiment example 3

[0040] The ferrite powder is prepared by the pipeline synthetic chemical co-precipitation method. The ferrite powder has the molecular chemical formula of Ni 0.8 Zn 0.16 co 0.04 Fe 2 o 4 ferrite powder. Among them, 4.0L of reaction mother liquor with a metal ion concentration of 1.5mol / L, 15wt% NH 3 ·H 2 2.8L of O solution and about 1.0mL of 15wt% NaOH solution, then prepare a reaction solution with a pH of 10 and heat it to 60°C; 4 + The molar ratio of metal ions is 2:1 to control the metal ion reaction mother liquor and NH 3 ·H 2 O flow, adjust the NaOH flow at the same time, control the pH of the reaction to be about 10, and the amount of NaOH solution after the reaction is about 0.2mL; quickly dry the reactant at 150°C to obtain about 450g of ferrite powder. The ferrite powder was prepared 10 times in the same way, and the total amount of ferrite powder obtained was about 4500 g. The sieved powder was put into a muffle furnace for pre-sintering at 700°C for 2h. ...

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Abstract

The invention provides a ferrite absorber for absorbing a high order mode in a high-frequency cavity and a manufacturing method thereof. An adopted material system is Ni-Zn-Co spinel (S) type ferrite the molecule chemical formula of which is NixZn[1-x-y]CoyFe2O4, wherein x is 0.40-0.80, and y is 0.04-0.20. The batch manufacturing of ferrite powder is carried out by using a power solid-state reaction method or a pipeline type synthetic chemical co-precipitation method; a ferrite cylinder-shaped blank is manufactured by using a normal pressing-sintering method; a ferrite block material is processed by using a finishing and cutting process; a silver layer is metalized by using silver paste screen printing and a subsequent sintering and permeating process of the silver paste; and the ferrite block material is brazed with the cavity body of the high-frequency cavity by adopting a flaky Sn-Ag alloy brazing flux. According to the invention, the wave-absorbing property of the ferrite absorber in a frequency band of 470MHZ-1090MHZ is achieved; and simultaneously, low brazing temperature is adopted, so as to avoid the variation of chemical components in the ferrite due to over-high brazing temperature and reductive atmosphere and effectively prevent the deterioration of the property of the ferrite in the brazing process; and the ferrite absorber is applied to the high-frequency cavity of a particle accelerator so as to deeply restrict the high order mode field and improve the stability of beam current in the cavity.

Description

technical field [0001] The invention relates to a ferrite absorber for absorbing high-order modes of a high-frequency cavity and a preparation method thereof. The preparation method of the absorber includes preparing a ferrite block by powder metallurgy and welding the block To the high-frequency cavity cavity (the substrate is oxygen-free copper). Background technique [0002] With the continuous increase of the current intensity of CESR, KEKB and BEPCII accelerators, the high-order mode field excited by the beam in the high-frequency cavity will also increase. If it is not fully absorbed and attenuated, it will It affects the stability of the beam, and even causes the loss of beam oscillation. One of the overcoming methods is to install a ferrite broadband high-frequency absorbing material on the beam channel of the high-frequency cavity, attenuate and absorb the high-order mode power coupled from the cavity, and then convert it into heat energy, and finally pass through ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05D11/16C04B35/26C04B35/622
Inventor 毛昌辉马书旺杨志民杨剑梁秋实苑鹏杜军
Owner GRIMAT ENG INST CO LTD