LHCb is an experiment dedicated to the study of new physics in the decays ofbeauty and charm hadrons at the Large Hadron Collider (LHC) at CERN. The VertexLocator (VELO) is the silicon detector surrounding the LHCb interaction point.The detector operates in a severe and highly non-uniform radiation environment.The small pitch and analogue readout result in a best single hit precision of 4$\rm \mu$m. The upgrade of the LHCb experiment, planned for 2018, will transform theentire readout to a trigger-less system operating at 40 MHz event rate. Thevertex detector will have to cope with radiation levels up to 10$^{16}$ 1MeV$\rm n_{eq}/cm^2$, more than an order of magnitude higher than thoseexpected at the current experiment. A solution is under development with apixel detector, based on the Timepix/Medipix family of chips with 55 x 55 $\rm\mu m$ pixels. In addition a micro-strip solution is also under development,with finer pitch, higher granularity and lower mass than the current detector.The current status of the VELO will be described together with recent testbeamresults.
展开▼
机译：LHCb是一项致力于研究CERN大型强子对撞机（LHC）的美和魅力强子衰变的新物理学的实验。 VertexLocator（VELO）是围绕LHCb相互作用点的硅探测器，该探测器在严苛且高度不均匀的辐射环境中运行，小间距和模拟读数可实现4 $ \ rm \ mu $的最佳单击精度米计划于2018年进行的LHCb实验升级将把整个读数转换为以40 MHz事件速率运行的无触发系统。顶点检测器将不得不应付高达10 $ ^ {16} $ 1MeV $ \ rm n_ {eq} / cm ^ 2 $的辐射水平，比当前实验的辐射水平高出一个数量级。目前正在开发一种基于Timepix / Medipix系列芯片的像素检测器，该芯片具有55 x 55 $ \ rm \ mu m $像素。另外，微带解决方案也正在开发中，与当前的检测器相比，它具有更细的间距，更高的粒度和更低的质量。VELO的当前状态将与最近的测试结果一起描述。
展开▼
