1 KAGRA vibration isolation meeting (1st of August 2012) 2 3 Attendees: DeSalvo, Hennes, Majorana, Takahashi, Uchiyama, Yamamoto 4 5 Riccardo: With Takanori, he measured the size of parts of the pre isolator 6 to look for the reason of the friction in the LVDT ([kagra-vi 00151]). 7 They found the extra filter base plate deformation (about 2mm), but nobody knows the 8 reason. Maybe, the material does not relax perfectly. When we buy them, 9 we must be careful (and re-relax ourselves at high temperature before). 10 Riccarod reported the result after this meeting [kagra-vi 00158]. 11 12 Tomorrow, Riccardo et al proceed with the size measurement (for example, 13 the length of the legs) 14 15 Eric: Takanori reported the frequency of the bouncing mode. Although he 16 found the 17 peak at 97 Hz, but he was not so sure that it is the bouncing mode. 18 Eric measured his similar system. The load is about 150kg. 19 His measured result is 47Hz. 20 21 Ryutaro explained the progress after the previous vi meeting. The 97 Hz 22 mode is the 23 the bouncing mode (they used two sensors to invetigate the shape of the 24 mode). 25 But, according to the calculation, the fundamental bouncing mode is about 26 50 Hz. 27 They found some peaks around 50Hz. But unfortunately, the resonant modes 28 of the frame 29 are also around 50Hz. Eric wil send his result later [kagra-vi 00157]. 30 31 Eric tried to measure IP transfer function using PZT, but it is not so 32 easy mission. 33 34 Riccardo proposed the actuator for the cryogenic mirror [kagra-vi 00154]. 35 We will discuss later.
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