Research and Development of a liquid argon calorimeter with a fast readout technique

1)液体Ar量热计的机械设计我们设计了一台用于强子对撞机(如SSC)的液体Ar强子量热计，在满足安全要求的同时，对设计进行了优化，并考虑了如何支撑、如何组装、如何冷却以及完成量热需要多长时间。对于放置在液体中的前置放大器的冷却，我们进行了实际测试，证明它们可以安全冷却。2)快速整形量能器的束流试验。我们在美国布鲁克海文国家实验室建立了一台尺寸为1m×1m，深度为1.7m(7.5个相互作用长度)的铅液Ar量热计，并用0.5~20GeV/cat能量的电子束和电子子束对其进行了测量，测量的成形时间分别为50、100和200 ns。我们研究了能量分辨率和时间分辨率、电子和电子的响应差异(e/h比)和堆积效应。通过这些研究，我们可以得出结论，液体Ar快速读出技术是一种用于强子对撞机(如SSC或LHC)的可行技术。

1)Mechanical design of the liquid argon calorimeter We have designed a liquid argon hadronic calorimeter to be used at a hadron collider such as the SSC.The design has been optimized to maximize the hermeticity and at the same time to satisfy the safety requirement.We have also considered how to support,how to assemble,how to cool and how long it takes to complete the calorimeter.On the cooling of the preamps to be placed within the liquid,we made an actual test to prove that they can be safely cooled. 2)Beam test of a calorimeter with fast shaping times. We have built a lead-liquid argon calorimeter of the size 1 m by 1m with 1.7 m depth(7.5 interaction lengths),and tested it with beams of electrons and pions of energies between 0.5 and 20 GeV/cat the Brookhaven National Laboratory.The shaping times tested were 50,100 and 200 ns. We investigated the energy and timing resolutions,difference of responses on electrons and pions(e/h ratio),and pile up effect. With hese studies,we could conclude that the technique of liquid argon with fast read out is a viable one for a use at a hadron collider such as the SSC or LHC.