Performance of the improved larger acceptance spectrometer: VAMOS++
Performance of the improved larger acceptance spectrometer: VAMOS++
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改进的更大接收光谱仪的性能：VAMOS
DOI：
10.1016/j.nima.2011.05.007
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发表时间：
2011
影响因子：
1.4
通讯作者：
C. Spitaels
中科院分区：
文献类型：
--
作者：
M. Rejmund;B. Lecornu;A. Navin;C. Schmitt;S. Damoy;O. Delaune;J. M. Enguerrand;G. Frémont;P. Gangnant;L. Gaudefroy;B. Jacquot;J. Pancin;S. Pullanhiotan;C. Spitaels
测量和离子光学计算表明，通过适当扩大焦平面上使用的探测器的尺寸，可以将GANIL的VAMOS光谱仪的大动量接受度从~ 11%进一步提高到~ 30%。本文介绍了一种新型的VAMOS焦平面探测系统。它由面积较大的探测器（1000毫米× 150毫米），即一个多线平行板雪崩计数器（MWPPAC），两个漂移室，一个分段电离室和一系列硅探测器组成。与先前的系统（VAMOS）相比，我们证明了新系统（vamos++）具有与色散无关的动量接受度。此外，在目标附近引入了一个起始检测器（MWPPAC），进一步将质量分辨率提高到~ 1/220。通过测量129xe在967 MeV下与197 Au碰撞形成的残余物，证明了vamos++光谱仪的性能。
Measurements and ion optic calculations showed that the large momentum acceptance of the VAMOS spectrometer at GANIL could be further increased from∼ 11% to∼ 30% by suitably enlarging the dimensions of the detectors used at the focal plane. Such a new detection system built for the focal plane of VAMOS is described. It consists of larger area detectors (1000 mm× 150 mm) namely, a Multi-Wire Parallel Plate Avalanche Counter (MWPPAC), two drift chambers, a segmented ionization chamber and an array of Si detectors. Compared to the earlier existing system (VAMOS), we show that the new system (VAMOS++) has a dispersion-independent momentum acceptance. Additionally, a start detector (MWPPAC) has been introduced near the target to further improve the mass resolution to∼ 1/220. The performance of the VAMOS++ spectrometer is demonstrated using measurements of residues formed in the collisions of 129 Xe at 967 MeV on 197 Au.