New update on the position of the Motors for the cavity
***** we moved the motors to set the cavity at 876MHz, and checked it right after with the RF modulation at FSR.
So compared to the expected setting we had to move inwards the two planar mirrors by 0.9 mm each.
Planar : M1-M2 motor = + 4.815 mm ------> M1-M2 = 78.399 mm
Spherical : M3-M4 motor = -2.9 mm ------> M3-M4 = 90.4895 mm
| Manar Amer wrote: |
- At the reference zero the distance between the mirrors is (taken from a reference presentation "status9nov2020" attached):
M1-M2 = 88.029 mm
M3-M4 = 84.6895 mm
- The distances between the spherical mirrors ( M3-M4 ) was set to take into account the stability of the mirror ( M3-M4 > Spherical mirror focal length = 85.3 mm)
M3-M4 = 90.5 mm
we increased the distance between them by 5.8 mm, and moving the mirrors symmetrically, M3 and M4 moved by -2.9 mm (negative defines outer motion)
- Following the definition of M3-M4, fixing of the angle = 2.55637 degrees and frequency (Frep = 876.3636 MHz). Distance between planners (M1-M2)
M1-M2 = 80.2 mm
we decreased the distance between them by 7.83 mm, and moving the mirrors symmetrically, M1 and M2 moved by +3.915 mm (positive defines inward motion)
**** Photo attached is the values on the software at the time.
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