KAGRA Logbook

According to Uchiyama-kun's check about when we changed from TMP to Ion during O3 commissioning, the change date was amazingly early as,

PR2, SR2, IYA, EXA, EYA: 2019/10/10-11 https://klog.icrr.u-tokyo.ac.jp/osl/?r=11087
Yarm (3 ion): 2019/10/12 https://klog.icrr.u-tokyo.ac.jp/osl/?r=11223
IMC, IXA: 2019/10/12 https://klog.icrr.u-tokyo.ac.jp/osl/?r=11123
Xarm(5 ion): 2019/12/25 https://klog.icrr.u-tokyo.ac.jp/osl/?r=12314
Yarm(2 ion -> total 5 ion): 2019/12/25 https://klog.icrr.u-tokyo.ac.jp/osl/?r=12315
OMC: 2020/1/27 https://klog.icrr.u-tokyo.ac.jp/osl/?r=12656

Although the vacuum level in MICH area is higher by ~10 times than those in XY arm, it might be better to start changing if TMP vibration affects on sensitivity.

Please note that the TMP and Ion between IMMT-IFI tanks were off now.