Precise alignment has been done with the SMART laser tracker system by M. Takano. Instead of him, Yamaoka reported the final results. Origin of coordinate is a point of 630 (700) mm from the upstream (downstream) on the beam line. the longitudinal position of the whole system was shifted by 3mm to the upstream, i.e. &Delta z=-3mm everywhere in the system. The center of three sensor cavities were calculated to be aligned at (x,y)=(0.051,-0.18), (0.045,-0.07) and (0.04,0.05) along the beam direction (z). Therefore, these alignment errors can be tolerable.
The special metal studs will arrive on 8 October (tomorrow). So, they will be used for fixing the SUS plate on the granite table, where the reference postions will be monitored by the SMART.
"Status of KEK nano-BPM", Y. Inoue
The resonant frequencies of the reference cavities were adjusted by squeezing cavities. The results are listed in a following table, where unit is GHz;
|nano-BPM||sensor cavity||ref. cavity:before||:after|
As final components in the mover system, metal studs will arrive for fixing the cavities on the V-block in next week. Also the electronics for 2nd and 3rd cavities are waited for the arrival.
The cables and a rack have been installed. The electrical connections were checked including the power lines. LAN cables are also available. However,a hub-station is failed to operate properly now, which is repaired soon.
First in the beam test, data will be read-out independently of the ATF control system by using our PCs. So, the data shall be synchronized with the ATF pulse by a scalar in similar way as the SLAC/LLNL system.
The schedule was reminded as follows;