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LHCb is a dedicated experiment to study new physics in the decays of beauty and charm hadrons at the Large Hadron Collider (LHC) at CERN. The Vertex Locator (VELO) is the silicon detector surrounding the interaction point and will be located only 7 mm from the LHC beam during normal operation. The beauty and charm hadrons are identified through their flight distance in the VELO, and hence the detector is critical for both the trigger and offline physics analyses. The VELO has been commissioned and successfully operated during the initial running period of the LHC. The detector has been time aligned to the LHC beam, and spatially aligned. Preliminary operational results show a signal to noise ratio of 20:1, a cluster finding efficiency of 99.6%, and a best single hit precision of 4μm.
Comment: Contribution to proceedings of 31st international conference on high energy physics, Amsterdam 24-31 July 2002 4 pages, 2 figures
The vertex locator of the LHCb experiment must provide precise information on the production and decay vertices of b-hadrons both off-line and for the second level trigger. This article reviews the design of the vertex detector and vertex trigger algorithm. Recent test beam results are provided and the future development programme is outlined.
The vertex locator of the LHCb experiment must provide precise information on the production and decay vertices of b-hadrons both off-line and for the second level trigger. This article reviews the design of the vertex detector and vertex trigger algorithm. Recent test beam results are provided and the future development programme is outlined.
Comment: Contribution to XXXVIIth Moriond Electroweak Conference, March 2002. 6 pages, 3 figures This version with typos corrected
The high voltage system supplies the bias voltage to the 88 silicon sensors which comprise the LHCb Vertex Locator (VELO). This note describes the results of the tests which have been performed on the hardware of the high voltage system of the VELO. Each individual test detailed in this note corresponds to a specific requirement of the system. These requirements arise primarily from ensuring the safety of the silicon sensors and the quality of the data taken from the VELO modules. The tests performed are in four categories: normal operation of the high voltage system; verification of its stability under operation; discussion of its behaviour in failure modes; and details of operation at low voltage. Noteworthy issues, identified through the tests, include the behaviour of the high voltage modules at voltages below 9V, the current lim...
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