A new coil driver with beacon path and modified zero/pole will be installed in the EXV2 rack. Modification for adding beacon path requires more strict thermal flow than normal one. According to AEL folks, an above space of this modified coil drvier should be blank. Current TM coil driver with beacon path and normal zero/pole is also installed following this requirements.
Because there is no good space to install the new coil driver satisfying , some circuits must be moved.
Minimum plan is shown in Fig.1. IMH coil driver will be moved to the place where unsed LPCD is installed now and a new coil driver will be installed to the place where IMH coil driver is installed now. Because IMH coil driver moves 3U and cables come from upper side, we need to check cable length is enough or not. (According to Ushiba-kun, it should be no problem.)
The second best plan is shown in Fig.2. Coil drivers for tower will be moved 1U and 2U blank space will be used for the new coil driver. It's tough work but concerns about cable lenght become not serious.
We re-arranged a rack layout of EXV2 in order to install å new special coil driver which has beacon summing path and modified zero/pole as 30Hz/3Hz.
Concerns about cable length were not an issue, so the minimum plan in klog#33920 was enough.
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Changes in this work:
- HPCD for IMH (S1707378) was moved from U39 to U36.
- LPCD CRY for TM_LP (S1604776) was moved from U36 to U39.
Change plan in Friday's work:
- LPCD CRY for TM_LP (S1604776) at U39 will be removed.
- The new special HPCD will be installed at U39.
Due to some troubles on measuring instruments, transfer function hasn't been measured yet (see also klog#33976).
LPCD CRY for TM LP path (S1604776) at U39 was be removed and HPCD with z30:p3 de-whitening filters and a beacon summing path (S2315284) was installed on that space. Finally we inserted an additional 150Ohm resistance at the output port of the coil driver.
Though we need a plan to retry measurements (mainly about schedule), we should find a cause of this issue and prepare an available measurement system at first.