CLOVER - Post cancellation close-out activities

宇宙微波背景（CMB）是宇宙早期发出的一种辐射。它告诉我们宇宙在时间上有一个开端。迄今为止对CMB强度的测量与宇宙起源的暴胀理论是一致的，但是还有很多东西需要学习。我们在天空中看到的结构——星系、星系团和超星系团——是在宇宙存在的最初几分之一秒的指数膨胀阶段由时空的原始量子涨落产生的。这些原始量子涨落是引力波背景的来源，引力波又在CMB的极化上产生一个特征，称为b模式。CLOVER，一个现已取消的由英国领导的实验，旨在测量这种b模式特征的频谱。为了实现这种高灵敏度，英国开发了新的世界级技术。这个后续项目将完成这些核心技术的集成和测试，并确保所有方面都是安全的，并记录下来供将来使用。

The Cosmic Microwave Background (CMB) is a radiation emitted in the very early Universe. It tells us that the Universe has a beginning in Time. Measurements to date of the intensity of the CMB are consistent with the inflationary theory of the origin of the Universe, however there is much still to learn. Structures - galaxies, clusters and super-clusters of galaxies - that we see in the sky are generated by primordial quantum fluctuations of spacetime during an exponential expansion phase during the first fraction of a second of the existence of the Universe. These primordial quantum fluctuations are the source of a background of gravitational waves, which in turn generates a signature on the polarisation of the CMB, known as B-modes. CLOVER, a now cancelled UK-led experiment, intended to measure the spectrum of this B-mode signature. To achieve this high-sensitivity, new world-class technologies have been developed in the UK. This follow-up project will complete the integration and testing of these core technologies and ensure that all aspects are secure and documented for any future use.