本文選題：X光源 + 雙頻法��； 參考：《中國科學(xué)院研究生院(上海應(yīng)用物理研究所)》2017年博士論文

【摘要】：X射線光源技術(shù)的發(fā)展已經(jīng)經(jīng)歷了了四代,安裝大量插入件的同步輻射加速器和高增益的自由電子激光裝置是現(xiàn)今主流的X光源方案。本文以上海同步輻射光源和在建的上海軟X射線自由電子激光裝置為應(yīng)用背景,開展了雙頻法束長測量的關(guān)鍵技術(shù)研究。論文通過對國內(nèi)外現(xiàn)有的各類束長測量方法展開調(diào)研,分析各種方法的測量能力、優(yōu)缺點(diǎn),結(jié)合實(shí)際應(yīng)用裝置的情況,選取雙頻法束長測量作為研究對象。完成雙頻法束長測量系統(tǒng)設(shè)計(jì),實(shí)現(xiàn)儲存環(huán)上逐束團(tuán)的長度測量,且測量誤差相對較小。高斯型束團(tuán)推導(dǎo)出的雙頻法束長計(jì)算原理、逐束團(tuán)測量需求分析,構(gòu)成了系統(tǒng)設(shè)計(jì)的理論基礎(chǔ)。結(jié)合紐扣電極輸出信號的頻譜分布和測試的經(jīng)驗(yàn),我們選取500MHz和3GHz作為雙頻法的工作頻率。加上對實(shí)際信號的大小和射頻電路設(shè)計(jì)主要參數(shù)的綜合考慮,完成了雙頻法束長測量系統(tǒng)的設(shè)計(jì)。束團(tuán)長度與電荷量的關(guān)系的實(shí)驗(yàn),我們采用條紋相機(jī)來進(jìn)行。同時利用條紋相機(jī)的測量值與雙頻法系統(tǒng)作對比,完成對單束團(tuán)和多束團(tuán)兩種情況下束長計(jì)算公式的驗(yàn)證以及系統(tǒng)參數(shù)K的標(biāo)定。束長同步振蕩過程的數(shù)學(xué)仿真,詳細(xì)地闡釋了注入事件發(fā)生前后束長變化的規(guī)律和時頻域的特征。單束團(tuán)和多束團(tuán)的注入過程束流實(shí)驗(yàn)的結(jié)果與仿真工作相符合,兩種情況下都成功地記錄了束長的同步振蕩過程。利用Hybrid器件對500MHz和3GHz信號在中頻進(jìn)行求差得到的差信號,更加明顯地看到束長的同步振蕩過程。雙頻法束長測量系統(tǒng)單束團(tuán)下的隨機(jī)測量誤差小于0.2ps,逐束團(tuán)的隨機(jī)測量誤差小于0.5ps,系統(tǒng)的動態(tài)范圍滿足5nC電荷量以下的測量要求。選擇高輸入功率限制的模擬器件,可以增大系統(tǒng)的動態(tài)范圍,使系統(tǒng)能夠應(yīng)用于質(zhì)子以及其他重離子的加速器。腔式探頭共模信號TM010具有很高的信號精度,設(shè)計(jì)兩個不同工作頻率的腔式探頭,可以用于FEL裝置進(jìn)行超短束長的測量,且能滿足裝置設(shè)計(jì)的測量要求。由于工程進(jìn)度的問題,雙頻雙腔法的研究我們只完成了系統(tǒng)設(shè)計(jì)和模擬前端電路的設(shè)計(jì)。整體線性度的實(shí)驗(yàn)室測試以及各器件的測試,保證了前端電路的可用性。
[Abstract]:The development of X-ray light source technology has gone through four generations. A large number of inserts of synchrotron radiation accelerator and a high gain free electron laser device are the mainstream X-ray light source schemes. Based on the application background of Shanghai synchrotron radiation light source and the Shanghai soft X-ray free electron laser facility under construction, the key techniques of dual-frequency beam length measurement have been studied in this paper. Based on the investigation of all kinds of beam length measurement methods at home and abroad, this paper analyzes the measuring ability, advantages and disadvantages of these methods, and selects dual-frequency beam length measurement as the object of study combined with the actual application of the device. The dual frequency beam length measurement system is designed to measure the length of the bundles on the storage ring, and the measurement error is relatively small. The principle of calculating beam length of double frequency method derived by Gao Si cluster, and the analysis of requirement of beam by cluster measurement, constitute the theoretical basis of system design. Combined with the spectrum distribution of button electrode output signal and the experience of measurement, we select 500MHz and 3GHz as the working frequency of dual-frequency method. Considering the actual signal size and the main parameters of RF circuit design, the design of dual-frequency beam length measurement system is completed. In the experiment of the relationship between the beam length and the charge quantity, we use the stripe camera to carry out the experiment. At the same time, the calculation formula of beam length and the calibration of system parameter K under the condition of single beam cluster and multiple beam cluster are verified by comparing the measured values of the fringe camera with the dual frequency method. The mathematical simulation of beam length synchronous oscillation process explains in detail the variation of beam length before and after injection events and the characteristics of time-frequency domain. The beam experiment results of single and multi-beam injection are in agreement with the simulation work. In both cases, the synchronous oscillation of beam length is successfully recorded. The synchronous oscillation process of beam length can be seen more obviously by using Hybrid device to obtain the difference signal of 500MHz and 3GHz signal in intermediate frequency. The random measurement error is less than 0.2psunder the single beam cluster and the random measurement error is less than 0.5ps. the dynamic range of the system can meet the requirement of 5nC charge measurement. The dynamic range of the system can be enlarged by selecting the analog device with high input power limit, and the system can be applied to the accelerator of proton and other heavy ions. The common mode signal TM010 of cavity probe has high signal precision. The design of two cavity probe with different working frequency can be used to measure the length of ultrashort beam in FEL device, and it can meet the requirements of the design of the device. Due to the progress of the project, we have only completed the design of the system and the design of the analog front-end circuit. The laboratory test of the overall linearity and the testing of each device ensure the availability of the front-end circuit.
【學(xué)位授予單位】：中國科學(xué)院研究生院(上海應(yīng)用物理研究所)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2017
【分類號】：TL594

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本文編號：1804493