本文關(guān)鍵詞：HIAF-BRing極化質(zhì)子加速方案研究　出處：《鄭州大學》2017年碩士論文　論文類型：學位論文

  更多相關(guān)文章： 自旋 極化 退極化共振 西伯利亞蛇 耦合

【摘要】：對核子之間相互作用的理解是整個核物理以及強子物理的基礎(chǔ)。核子-核子散射是研究核力的理想工具。開展極化實驗可以測量完整的核子-核子散射觀測量。因此為了更深入地研究核子性質(zhì),中國科學院近代物理研究所提出了在強流重離子加速器裝置(HIAF)上利用極化質(zhì)子束開展實驗的計劃。極化束流將會在同步加速器中做多次回旋運動,可能受到周期性磁場的擾動,在一定條件下,有些粒子的自旋將會翻轉(zhuǎn),這就是退極化現(xiàn)象。發(fā)生退極化現(xiàn)象,極化束流的極化度將會降低,甚至變得完全非極化。本文的工作就是要結(jié)合BRing的設(shè)計參數(shù),設(shè)計一套合理的極化束加速方案,以保證在未來的極化實驗中HIAF-BRing可以提供具有較高極化度的束流。在環(huán)形加速器中,由于離子的回旋運動,極化會周期性地受到擾動磁場的影響,發(fā)生退極化共振。退極化共振有很多種,例如非理想共振,固有共振,耦合共振,同步輻射邊帶共振,snake共振等。在本文的工作中忽略高階共振,僅考慮兩種主要的退極化共振——固有共振和非理想共振對束流極化度的影響。極化動力學由Thomas-BMT方程描述,同時,在Fernet-Serret曲線坐標下,利用Thomas-BMT方程我們研究了加速器中主要退極化共振的誘導因素,并推導了關(guān)于退極化強度的計算公式。HIAF增強器BRing將把極化質(zhì)子束加速至9.3GeV/u,在整個加速過程中極化束流將會遇到多次退極化共振。根據(jù)我們的研究理論,計算了在BRing加速過程中不同退極化共振的強度。同時根據(jù)極化在穿越孤立共振時變化所滿足的Froissart-Stora方程,編寫程序計算了BRing中兩種強的退極化共振對極化度的影響。結(jié)果表明:加速過程遇到的兩種退極化共振將會使BRing中的極化束流完全退極化。目前常用的解決退極化共振的方法主要有:安裝自旋旋轉(zhuǎn)器,閉軌校正,tune jump和安裝西伯利亞蛇磁鐵系統(tǒng)。因為BRing的垂直工作點接近半整數(shù),因此我們采取在BRing電子冷卻段加入Full SiberianSnake磁鐵系統(tǒng)的方法,克服固有共振和非理想共振,從而使質(zhì)子束在加速時保持較高的極化度。同時螺線管引入的橫向耦合效應也通過加入四極磁鐵的方式被消除,完整的元件參數(shù)均已給出。這將是我國首次關(guān)于極化質(zhì)子的加速研究,也為未來在HIAF上開展極化實驗奠定了良好的基礎(chǔ)。
[Abstract]:The understanding of nucleon interaction is the basis of the whole nuclear physics and Hadron physics. Nucleon-nucleon scattering is an ideal tool for studying nuclear force. Complete nucleon-nucleon scattering observations can be measured by polarization experiments. So in order to study nuclear properties more deeply. The Institute of Modern Physics of the Chinese Academy of Sciences has put forward the plan of using polarized proton beam to carry out experiments on the high current heavy ion accelerator (HIAF), which will perform many cyclotron motions in the synchrotron. Under certain conditions, the spin of some particles will be reversed, which is the phenomenon of depolarization, the polarization of the polarization beam will be reduced. The work of this paper is to design a set of reasonable polarization beam acceleration scheme combined with the design parameters of BRing. In order to ensure that in future polarization experiments HIAF-BRing can provide a beam with high polarizability. In the ring accelerator due to the cyclotron motion of ions. Polarization is periodically affected by the disturbed magnetic field and depolarized resonance occurs. There are many kinds of depolarization resonance, such as non-ideal resonance, inherent resonance, coupling resonance, synchrotron radiation sideband resonance. Snake resonance and so on. High order resonance is neglected in the work of this paper. Only two main depolarization resonances-natural resonance and non-ideal resonance are considered. The polarization dynamics is described by Thomas-BMT equation and at the same time. In the Fernet-Serret curvilinear coordinates, we study the inductive factors of the main depolarization resonance in the accelerator by using the Thomas-BMT equation. The formula of depolarization intensity is derived. The BRing of HIAF intensifier will accelerate the polarized proton beam to 9.3 GeV / u. During the whole acceleration process, the polarized beam will encounter multiple depolarization resonance. The intensity of different depolarization resonance during BRing acceleration is calculated, and the Froissart-Stora equation of polarization variation in the process of passing through the isolated resonance is given. The influence of two strong depolarization resonance in BRing on the polarization degree is calculated. The results show that:. Two kinds of depolarization resonance in the acceleration process will depolarize the polarized beam completely in BRing. At present, the commonly used method to solve depolarization resonance is to install spin rotator. Close orbit correction tune jump and install Siberian snake magnet system. BRing's vertical operating point is close to half an integer. Therefore, we adopt the method of adding Full SiberianSnake magnet system to the BRing electronic cooling section to overcome the inherent resonance and non-ideal resonance. The transverse coupling effect of solenoid is eliminated by adding quadrupole magnets. The complete parameters of the components have been given. This will be the first acceleration study of polarized protons in China and will lay a good foundation for future polarization experiments on HIAF.
【學位授予單位】：鄭州大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：O571

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