论文标题
新的Hades TOF前进探测器
The new HADES ToF Forward Detector
论文作者
论文摘要
GSI DARMSTADT的高接受性二元光谱仪（HADE）由一个以梁轴上为中心的6线圈环形磁体和位于线圈之间的六个相同的检测段和覆盖$ 18^\ cirp $ 85^\ $ 85^\ circ $之间的六个相同的检测部分组成。物理学的目的包括研究热和密集的规格物质的性质以及基础和触发诱导的反应。 为了增加前向区域的高极角度对hades的接受，已经建立了新的检测器，前向探测器（FD）$ 0.5^\ Circ $和$ 7^\ Circ $。 FD由基于电阻板室（RPC）技术的跟踪和飞行时间（TOF）探测器组成。 TOF检测器覆盖$ 2 $ M $^2 $的面积由$ 128 $带状屏蔽的RPC电池组成，两个不同的宽度$ 22 $ 22 $ mm和$ 44 $毫米和$ 750 $毫米的长度分布在四个模块中，该模块在光束轴周围放置在四个模块中。每个电池由四个气体间隙组成，$ 0.270 $毫米，由三个（$ 2 $毫米）的铝和两个（$ 1 $毫米）的玻璃电极界定。为了应付靠近梁轴的预期最大粒子负载约为$ 400 $ hz/cm $^{2} $，检测器的操作量高于室温，以降低玻璃的电阻率并提高计数速率能力。 在此通信中描述了系统构建的详细信息和有关正时精度的结果。该检测器的运行$ 31.5^\ Circ $ C，最大粒子负载约为$ 600 $ Hz/cm $^2 $，在生产光束时间持续六周的早期$ 2022 $，平均时间为$ 80 $ PS。
The High-Acceptance DiElectron Spectrometer (HADES) at GSI Darmstadt consists of a 6-coil toroidal magnet centered on the beam axis and six identical detection sections located between the coils and covering polar angles between $18^\circ$ and $85^\circ$. The physics aims include the study of the properties of hot and dense hadronic matter as well as elementary and pion-induced reactions. To increase the acceptance of HADES at very low polar angles in the forward region, between $0.5^\circ$ and $7^\circ$, a new detector, the Forward Detector (FD), has been built. The FD is composed of a tracking and a Time Of Flight (TOF) detector based on Resistive Plate Chamber (RPC) technology. The TOF detector, covering an area of around $2$ m$^2$, is composed by $128$ strip-like shielded RPC cells, with two different widths $22$ mm and $44$ mm and $750$ mm length distributed in four modules symmetrically placed around the beam axis. Each cell is composed by four gas gaps, $0.270$ mm, delimited by three ($2$ mm) aluminum and two ($1$ mm) glass electrodes. In order to cope with an expected maximum particle load of around $400$ Hz/cm$^{2}$, close to the beam axis, the detector is operated above room temperature in order to decrease the resistivity of the glass and increase the count rate capability. Details of the system construction and results concerning timing precision are described in this communication. The detector was operated at $31.5^\circ$C with a maximum particle load of around $600$ Hz/cm$^2$ during a production beam time for six weeks in early $2022$ showing an average time precision of around $80$ ps.
