Updates for lightning season 2023

[jaycedowell]

Updates for this summer's lightning season:

• [x] Keep trigger length at 1000 ms but change the pre-trigger time to 250 ms
• [x] Add in new equalizer coefficients based on the functional form 0.09*np.exp(f**2/50**2) where f is the frequency in MHz.
• [x] Test whether or not equalizer coefficients can be changed on-the-fly or if they can only be changed as part of the INI process
• [x] Add in equalizer setting change as part of adp_enable_triggering.py

[jaycedowell]

The equalizer coefficients are loaded as part of the AdpRoach.configure_fengine() method which is called whenever DRX is re-tuned. That should mean that we can update the fft_f[1234]_cg_bpass_bram registers on-the-fly to change the coefficients.

[jaycedowell]

fcdc3c4 add in a new equalizer_lightning.txt set of equalizer coefficients. These are computed using the functional form c(f) = 0.09*np.exp(f**2/50**2) where f is the frequency in MHz and:

• Setting values for f < 20 MHz to c(20 MHz) and f > 85 MHz to c(85 MHz).
• Smoothing the data with a boxcar window 61 channels wide to soften the frequency cuts.
• Scaling the smooth coefficients to match the mean values in equalizer.txt over the frequency range of 65 to 75 MHz.

[jaycedowell]

fcdc3c4 updates adp_enable_triggering.py to toggle the lightning equalizer coefficients on/off in the ROACH2s. I think this plays nicely with the ADP control software and that re-tuning will not force everything back to the default equalizer coefficients.