LBNE中微子束线的设计现状
Status of the Design of the LBNE Neutrino Beamline
摘要：
长基线中微子实验（LBNE）将利用位于费米实验室的中微子束线设施，在中微子物理学方面开展引人注目的研究计划。该设施将把一束中微子射向大约1300公里外的南达科他州霍姆斯特克煤矿的探测器。中微子的产生过程如下：首先，从主注入器的MI-10部分提取的质子（60-120 GeV）击中一个固体靶并产生介子。然后，带电介子被一组聚焦喇叭聚焦到一个250米长的衰变管中，朝向远处的探测器。最后，进入衰变管的介子衰变为中微子。该设施的参数是在考虑到若干因素的情况下确定的，这些因素包括物理目标、设施建模、空间和放射性限制以及在费米实验室运行NuMI设施所获得的经验。初始束流功率预计约为700千瓦，但选择的一些参数能够处理2.3兆瓦的束流功率，以使该设施能够与升级的加速器复合体一起运行。我们在这里讨论的设计和相关的挑战的状态。
英文摘要：
The Long Baseline Neutrino Experiment (LBNE) will utilize a neutrino beamline facility located at Fermilab to carry out a compelling research program in neutrino physics. The facility will aim a beam of neutrinos toward a detector placed at the Homestake Mine in South Dakota, about 1300 km away. The neutrinos are produced as follows: First, protons extracted from the MI-10 section of the Main Injector (60-120 GeV) hit a solid target above grade and produce mesons. Then, the charged mesons are focused by a set of focusing horns into a 250 m long decay pipe, towards the far detector. Finally, the mesons that enter the decay pipe decay into neutrinos. The parameters of the facility were determined taking into account several factors including the physics goals, the modeling of the facility, spacial and radiological constraints and the experience gained by operating the NuMI facility at Fermilab. The initial beam power is expected to be ~700 kW, however some of the parameters were chosen to be able to deal with a beam power of 2.3 MW in order to enable the facility to run with an upgraded accelerator complex. We discuss here the status of the design and the associated challenges.
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