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⇤ ← Revision 1 as of 2022-01-13 14:53:06
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| Naoki Koyama, Marc Eisenmann, Haoyu Wang | |
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| * Theta map and alpha-minus map have high spatial frequency components (sharp features) which is a problem for simulation. * Theta is wrapped due to the tangent function. We are trying to unwrap theta, which can make the map smooth. * The offset (zero-order Zernike polynomial) of TWEs at two rotation angles may be different. Then the subtraction of two TWEs will have errors. This will contribute errors in calculating theta. * How to ensure the offset of TWE stay the same after rotating the mirror in real TWE measurements? * We are currently simulating round-trip loss in one arm cavity when birefringence is considered with the MZ model with fixed parameters (without maps). |
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| * Birefringence characterization of Spare ETMY | * Birefringence characterization of Spare ETMY (Marc) * The maximum value of Delta-n map is close between calculation and measurement. * The calculation of theta map shows some sharp features while the measurement is quite smooth. There may be two reasons: 1) the denominator in calculating theta will be zero (if the subtraction of two TWE is zero), 2) theta is wrapped. |
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* KAGRA filter cavity: |
* Koyama is writing his thesis and is going to graduate next month. |
Simulation meeting 2022 Jan 13 15:00
Zoom2: https://zoom.us/j/6676627462
Participants
Naoki Koyama, Marc Eisenmann, Haoyu Wang
Agenda
Updates from Projects
- Birefringence simulation
- Theta map and alpha-minus map have high spatial frequency components (sharp features) which is a problem for simulation.
- Theta is wrapped due to the tangent function. We are trying to unwrap theta, which can make the map smooth.
- The offset (zero-order Zernike polynomial) of TWEs at two rotation angles may be different. Then the subtraction of two TWEs will have errors. This will contribute errors in calculating theta.
- How to ensure the offset of TWE stay the same after rotating the mirror in real TWE measurements?
- We are currently simulating round-trip loss in one arm cavity when birefringence is considered with the MZ model with fixed parameters (without maps).
- Birefringence characterization of Spare ETMY (Marc)
- The maximum value of Delta-n map is close between calculation and measurement.
- The calculation of theta map shows some sharp features while the measurement is quite smooth. There may be two reasons: 1) the denominator in calculating theta will be zero (if the subtraction of two TWE is zero), 2) theta is wrapped.
- GUI
- Koyama is writing his thesis and is going to graduate next month.