Indirect measurement of the Hubble Constant through stereoscopic gamma-ray observations with CTA-LST and MAGIC

立体声硬件触发器已经安装并验证。特别是，我们在LST相机和MAGIC计数室之间购买并部署了一条新的触发器电缆，与之前的安装相比，触发器传输时间缩短了约500 ns。这对于及时传送LST触发器以建立与MAGIC望远镜的重合触发器是重要的，因为MAGIC望远镜具有相对较短的模拟缓冲器长度。我们还在MAGIC触发系统中安装了一个新的固件，并开发了软件代码来控制和监测LST和MAGIC望远镜之间的天顶和方位角相关触发延迟。调整了触发时间，并在硬件立体模式下采集了几组测试数据，同时研究了河外背景光密度约束的方法，该方法可直接用于约束哈勃常数H_0。

The stereo hardware trigger has been installed and validated.In particular, we purchased and deployed a new trigger cable between the LST camera and MAGIC counting house shortening the trigger travel time by about 500ns compared to the previous installation. This is important to deliver the LST trigger in time to build a coincidence trigger with the MAGIC telescopes because MAGIC telescopes have a relatively short analog buffer length. We also installed a new firmware in MAGIC trigger system and developed the software code to control and monitor zenith and azimuth dependent trigger delays between LST and MAGIC telescopes. The trigger timing has been adjusted and several test data sets has been taken in hardware stereo mode.In the same time work on methodology to derive constraints on the density of the Extragalactic Background Light has been done, which can be directly used to constrain the Hubble constant H0.