本文選題：強(qiáng)流重離子加速器裝置 + 雙向涂抹注入　； 參考：《中國(guó)科學(xué)院大學(xué)(中國(guó)科學(xué)院近代物理研究所)》2017年博士論文

【摘要】：粒子加速器是核物理研究的重要平臺(tái),自從它在二十世紀(jì)三十年代問世以來,其一直隨著時(shí)代的發(fā)展向著更高的性能進(jìn)行突破。如今,為了滿足我國(guó)核物理研究對(duì)高流強(qiáng)重離子束的需求,中國(guó)科學(xué)院近代物理研究所開始建造我國(guó)新一代重離子加速器——“強(qiáng)流重離子加速器裝置”(HIAF)。HIAF建成后,它將能夠提供國(guó)際同類裝置中最強(qiáng)的中低能脈沖重離子束流,輸出最高功率的短脈沖、強(qiáng)聚焦、高能量重離子束團(tuán)。該加速器裝置由強(qiáng)流超導(dǎo)離子源SECR、強(qiáng)流超導(dǎo)離子直線加速器i Linac、磁剛度為34Tm的增強(qiáng)器BRing、磁剛度為13Tm的高精度環(huán)形譜儀SRing以及多個(gè)實(shí)驗(yàn)終端和相關(guān)配套設(shè)施構(gòu)成。BRing作為HIAF的主環(huán),其設(shè)計(jì)引出粒子數(shù)為1×10~(11)(~(238)U~(34+))。為了達(dá)到如此高的引出粒子數(shù),同時(shí)降低共振損失的風(fēng)險(xiǎn),BRing選擇了雙向涂抹注入方法。雙向涂抹注入方法是由C.R.Prior在二十世紀(jì)九十年代提出的,其利用一塊傾斜放置的靜電偏轉(zhuǎn)板偏轉(zhuǎn)注入束,同時(shí)利用凸軌磁鐵在注入點(diǎn)處形成水平和垂直方向的局部凸軌,通過改變注入過程中局部凸軌的高度,完成在環(huán)形加速器內(nèi)的多圈注入,同時(shí)在水平和垂直相空間進(jìn)行涂抹。其優(yōu)點(diǎn)為注入增益遠(yuǎn)高于典型的單向多圈注入,而且累積束的橫向分布較為均勻,減弱了空間電荷效應(yīng)。研究表明注入?yún)?shù)對(duì)雙向涂抹注入的影響非常顯著。為了得到高的注入增益和注入效率,本文對(duì)BRing的注入?yún)?shù)進(jìn)行了優(yōu)化。本文基于MATLAB編寫了雙向涂抹注入優(yōu)化程序,該程序中利用多種近似方法減少了程序的計(jì)算量,應(yīng)用了遺傳算法提高了優(yōu)化速度,實(shí)現(xiàn)了在現(xiàn)有計(jì)算條件下對(duì)BRing注入?yún)?shù)的優(yōu)化。為了驗(yàn)證優(yōu)化結(jié)果的正確性,本文利用ORBIT程序?qū)Ring的注入過程進(jìn)行了粒子跟蹤模擬。ORBIT是一款粒子跟蹤程序,其利用PIC的方法處理粒子間空間電荷效應(yīng)�；谏鲜鰞�(yōu)化程序得出的注入?yún)?shù)模擬結(jié)果表明,注入113圈束流,注入效率為97.7%,最終注入增益為110.3倍,累積束的橫向分布較為均勻,空間電荷效應(yīng)引起的粒子工作點(diǎn)漂移為-0.02左右。該結(jié)果說明,優(yōu)化程序是正確的,當(dāng)前得到的優(yōu)化結(jié)果滿足了HIAF-BRing的累積粒子數(shù)要求。本文研究了多種注入?yún)?shù)偏離設(shè)定值對(duì)BRing注入效率的影響,包括注入束發(fā)射度增長(zhǎng)、注入方向偏離、靜電偏轉(zhuǎn)板傾角安裝誤差、機(jī)器工作點(diǎn)偏離、凸軌磁鐵電源延遲。研究結(jié)果表明,雖然注入?yún)?shù)偏離對(duì)注入效率有影響,但是注入效率可維持在95%以上,可以滿足HIAF-BRing對(duì)累積粒子數(shù)的要求。
[Abstract]:Particle accelerator is an important platform for nuclear physics research. Since it came out in 1930s, particle accelerator has been developing to higher performance breakthrough with the development of the times. Today, in order to meet the needs of nuclear physics research in China for high current heavy ion beams, the Institute of Modern Physics of the Chinese Academy of Sciences began to build a new generation of heavy ion accelerator-"high current heavy ion accelerator device". It will be able to provide the strongest medium and low energy pulse heavy ion beam in the international equipment of the same kind, output the highest power short pulse, strong focus, high energy heavy ion beam cluster. The accelerator consists of a strong current superconducting ion source, I Linac, an intensifier with magnetic stiffness of 34Tm, a high-precision ring spectrometer SRing with magnetic stiffness of 13Tm, and several experimental terminals and related facilities as the main ring of HIAF. The number of produced particles is 1 脳 10~(11)(~(238)U~(34. In order to achieve such a high number of extraction particles and reduce the risk of resonance loss, BRing has chosen a bidirectional smear injection method. The bidirectional smear injection method was proposed by C.R.Prior in the 1990s. It uses an inclined electrostatic deflection plate to deflect the beam and a convex rail magnet to form a horizontal and vertical local convex rail at the injection point. By changing the height of the local convex orbit in the injection process, the multi-cycle injection is completed in the annular accelerator, and the smear is carried out in the horizontal and vertical phase space at the same time. The advantages are that the injection gain is much higher than that of the typical unidirectional multi-loop injection, and the transverse distribution of the cumulative beam is more uniform, which weakens the space charge effect. The results show that the effect of injection parameters on bidirectional smear injection is very significant. In order to obtain high injection gain and injection efficiency, the injection parameters of BRing are optimized. In this paper, a bidirectional smear injection optimization program based on MATLAB is developed. In the program, many approximate methods are used to reduce the calculation amount of the program, and the genetic algorithm is applied to improve the optimization speed, and the parameters of BRing injection are optimized under the existing calculation conditions. In order to verify the correctness of the optimized results, the particle tracking simulation of the injection process of BRing using ORBIT program. ORBIT is a particle tracking program, which uses the method of PIC to deal with the interparticle space charge effect. The simulation results of the injection parameters based on the above optimization program show that the injection efficiency is 97.7, the injection gain is 110.3 times, and the transverse distribution of the cumulative beam is more uniform. The drift of particle working point caused by space charge effect is about -0.02. The results show that the optimization program is correct, and the current optimization results meet the requirements of the cumulative particle number of HIAF-BRing. In this paper, the effects of various injection parameters deviations on the injection efficiency of BRing are studied, including the increase of injection beam emissivity, the deviation of injection direction, the installation error of electrostatic deflector inclination angle, the deviation of machine working point, and the delay of power supply for convex rail magnets. The results show that the injection efficiency can be maintained at more than 95%, although the deviation of injection parameters has an effect on the injection efficiency, which can meet the requirements of HIAF-BRing for cumulative particle number.
【學(xué)位授予單位】：中國(guó)科學(xué)院大學(xué)(中國(guó)科學(xué)院近代物理研究所)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2017
【分類號(hào)】：TL544

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