bridging funds for travel for the CHIPS R&D program

目前，中微子探测器的成本限制了它们的质量。我们建议开拓一种方法，利用自然发生的水体与中微子束一起，提供一个负担得起的，精确的中微子探测器。中微子CP破坏由相位角dCP描述，dCP通过寻找出现在μ子中微子束中的电子中微子来探测。主要的挑战是将电子中微子与其他背景相互作用分离。水切伦科夫探测器已被证明可以很好地用于这一目的，电子中微子纯度高达90%。CHIPS（Cherenkov Detectors In PitS）概念将包括一个不透光、防水的PVC袋，装满纯水，由一个简单的管状框架支撑，并浸没在深湖中。湖水将提供必要的机械支撑，并作为覆盖层保护探测器免受宇宙射线的影响。安装在框架内侧的光电倍增管（PMT）将检测切伦科夫光。这个概念既不需要庞大的机械结构，也不需要地下洞穴，这是传统中微子探测器设计的两个主要费用。

Presently, the cost of neutrino detectors limits their mass. We propose to pioneer a way to utilize a naturally occurring body of water together with a neutrino beam, to provide an affordable, precision neutrino detector. Neutrino CP violation is described by a phase angle, dCP, which is probed by looking for electron neutrinos appearing in a muon neutrino beam. The main challenge is separating electron neutrinos from other background interactions. Water Cherenkov detectors have been demonstrated to work well for this purpose with electron neutrino purities of up to 90%. The CHIPS (Cherenkov detectors In PitS) concept will comprise a light-tight, water-tight PVC bag, filled with pure water, supported by a simple tubular frame and submerged in a deep lake. The lake water will provide the necessary mechanical support and serve as an overburden to shield the detector from cosmic rays. The Photomultiplier tubes (PMTs) mounted on the inside of the frame will detect the Cherenkov light. This concept requires neither a massive mechanical structure nor an underground cavern, two of the dominant expenses associated with traditional neutrino detector designs.