暗物質(zhì)粒子探測器徑跡重建方法的研究
發(fā)布時間：2018-10-05 08:10
【摘要】：暗物質(zhì)粒子探測器(DAMPE,Dark Matter Particle Explorer)旨在通過對空間高能粒子的大能量范圍、高能量分辨和高空間分辨的觀測間接探究暗物質(zhì)的存在和分布.徑跡重建是利用探測器不同位置探測通道的觀測結(jié)果重建高能粒子入射位置和方向,其結(jié)果的準(zhǔn)確性決定了探測器的空間分辨本領(lǐng).暗物質(zhì)粒子探測器徑跡重建主要依靠其中的硅陣列探測器(STK,Silicon Tracker)和BGO(鍺酸鉍,Bi4Ge3O12)量能器兩個子探測器的觀測.結(jié)合兩者的設(shè)計原理和結(jié)構(gòu),利用多次束流試驗和地面宇宙線實驗數(shù)據(jù)細(xì)致探討了徑跡重建的基本方法,主要包含3個基本步驟:徑跡點的選取,徑跡點的擬合以及最佳徑跡的判選.粒子在每層STK和BGO晶體中往往留下多個擊中點,首先給出了一種利用BGO重心法得到粒子粗略徑跡并以此限定STK徑跡點的方法.接著對于選定的一組可能的STK徑跡點嘗試了Kalman濾波和直線最小二乘擬合兩種擬合法,并發(fā)現(xiàn)兩種方法分別獨立得到比較一致的結(jié)果,從而驗證了結(jié)果的有效性.最后,對于重建得到的多條可能徑跡,討論了一些利用BGO量能器和STK結(jié)果進行聯(lián)合判選的方法.利用提出的徑跡重建方法對多次束流試驗數(shù)據(jù)的處理表明,暗物質(zhì)粒子探測器的空間分辨完全達(dá)到了設(shè)計要求.
[Abstract]:The dark matter particle detector (DAMPE,Dark Matter Particle Explorer) aims to explore the existence and distribution of dark matter indirectly through the observation of large energy range, high energy resolution and high spatial resolution of high energy particles in space. Track reconstruction is to reconstruct the incident position and direction of high-energy particles by using the observation results of probe channels at different positions. The accuracy of the results determines the spatial resolution of the detectors. The track reconstruction of dark matter particle detector mainly depends on the observation of silicon array detector (STK,Silicon Tracker) and BGO (bismuth germanate Bi4Ge3O12) calorimeter. Combined with the design principle and structure of the two methods, the basic methods of track reconstruction are discussed in detail by using the data of multiple beam tests and cosmic ray experiments on the ground, which mainly include three basic steps: the selection of track points. The fitting of track points and the selection of the best track. Particles often leave more than one hit point in each layer of STK and BGO crystals. Firstly, a method to obtain the rough track of particles by using BGO barycenter method and to define the STK track point is presented. Then, Kalman filtering and linear least square fitting are used to fit a set of possible STK track points, and the two methods are found to be independent of each other to obtain relatively consistent results, thus validating the validity of the results. Finally, for several possible tracks reconstructed, some methods of joint selection using BGO calorimeter and STK results are discussed. It is shown that the spatial resolution of the dark matter particle detector fully meets the design requirements by using the proposed track reconstruction method to deal with the data of multiple beam experiments.
【作者單位】： 中國科學(xué)院紫金山天文臺;中國科學(xué)院暗物質(zhì)與空間天文重點實驗室;中國科學(xué)院大學(xué);
【基金】：國家自然科學(xué)基金項目(11303105、11303106、11303107)資助
【分類號】：P145.9
，
本文編號：2252640
[Abstract]:The dark matter particle detector (DAMPE,Dark Matter Particle Explorer) aims to explore the existence and distribution of dark matter indirectly through the observation of large energy range, high energy resolution and high spatial resolution of high energy particles in space. Track reconstruction is to reconstruct the incident position and direction of high-energy particles by using the observation results of probe channels at different positions. The accuracy of the results determines the spatial resolution of the detectors. The track reconstruction of dark matter particle detector mainly depends on the observation of silicon array detector (STK,Silicon Tracker) and BGO (bismuth germanate Bi4Ge3O12) calorimeter. Combined with the design principle and structure of the two methods, the basic methods of track reconstruction are discussed in detail by using the data of multiple beam tests and cosmic ray experiments on the ground, which mainly include three basic steps: the selection of track points. The fitting of track points and the selection of the best track. Particles often leave more than one hit point in each layer of STK and BGO crystals. Firstly, a method to obtain the rough track of particles by using BGO barycenter method and to define the STK track point is presented. Then, Kalman filtering and linear least square fitting are used to fit a set of possible STK track points, and the two methods are found to be independent of each other to obtain relatively consistent results, thus validating the validity of the results. Finally, for several possible tracks reconstructed, some methods of joint selection using BGO calorimeter and STK results are discussed. It is shown that the spatial resolution of the dark matter particle detector fully meets the design requirements by using the proposed track reconstruction method to deal with the data of multiple beam experiments.
【作者單位】： 中國科學(xué)院紫金山天文臺;中國科學(xué)院暗物質(zhì)與空間天文重點實驗室;中國科學(xué)院大學(xué);
【基金】：國家自然科學(xué)基金項目(11303105、11303106、11303107)資助
【分類號】：P145.9
，
本文編號：2252640
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