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The photodiode used to get the RF signal from the oscillator is connected to the timing system through a narrow bandpass filter. The photodiode voltage will not show up on the control panel unless the oscillator cavity length is close to correct. When locking, manually adjust the cavity length using the stepper motor to get the frequency within 50Hz, then check the voltage of the photodiode.
Timing laser and e-beam at IP
There are several methods and locations in sector20 at which synchronous time of arrival between e-beam and laser can be measured.
Compressor window delay: 18.4 ps
Axilens ionization at gas jet location
| Date | target time | notes |
|---|---|---|
October 12th 2023 | 1256.7187 ns | compressor window IN / RP attenuator OUT / Laser room ND filters OUT |
Februrary 16th 2024 | 1252.4094 ns | compressor window IN / RP attenuator OUT / Laser room ND filters OUT |
March 10th 2024 | 1255.906 ns | compressor window IN / RP attenuator OUT / Laser room ND filters OUT |
E320 collision interaction
| Date | target time | notes |
|---|---|---|
Februrary 16th 2024 | 1251.776 | compressor window OUT / RP attenuator OUT / Laser room ND filters OUT |
EOS1
| Date | target time | notes |
|---|---|---|
| Februrary 16th 2024 | 1251.911 ns | EOS delay = 0 / RP attenuator OUT / Laser room ND filters OUT / EOS filter state unkown (likely out) |
EOS2
| Date | target time | notes |
|---|---|---|
| March 16th 2024 | 1255.291 ns | EOS delay = -21 / Laser room ND filters OUT / EOS filter OUT |