Daniel, Kevin, (Erik, Dave), Vicky
Kevin is interested in taking ADF sweeps around the second higher order mode arm resonance near 10.4 kHz.
We (Daniel) made model changes in h1ioplsc0 and h1omcpi that should enable higher freq ADF demods. Daniel built the models successfully. Then Dave also built these models successfully for the custom RCG running on h1omcpi for the variable duotone. We put in a WP to boot in these changes to h1ioplsc0 and h1omcpi next Tuesday 6/10.
From h1ioplsc0, we added 2 new PCIe channels to write the digital ADF LO oscillator out to PCIe. These are H1:IOP-PCI_ADF_VCXO_{COS,SIN} in screenshot 1. We also changed a rogue limiter such that the ADF should be able to scan +/-1 MHz according to the PLL.
In h1omcpi, we use the fast 64 kHz OMC PI user model to do a fast digital demodulation of the OMC_DCPD_SUM signal using the above ADF-LO PCIe channels. This is beating the fast dcpd output signal (H1:OMC-PI_DCPD_64KHZ_AHF), against the ADF LO's cosine and sine components from PCIe (H1:IOP-PCI_ADF_VCXO_{COS,SIN}), to get the demodulated ADF I/Q signals. The demod signals will have names like H1:OMC-PI_ADF_DEMOD_{I,Q}. Screenshots 2-4.
Operationally nothing should change for the ADF or for OMC-based fast PI damping. We are just using PCI to send 2 IPC channels from an IOP model to a user model on a different computer at ~65kHz, and doing the demod in a 64kHz user model (but the demod does not go anywhere, it is just used for squeezer diagnostics).
Model change summary:
h1ioplsc0
+2 IPC senders to H1.ipc
+2 slow channels to DAQ
h1omcpi
(+2 IPC receivers)
+33 slow channels to DAQ
Model changes today seem relatively successful. No way to verify in hardware (yet), but the ADF PLL claims it successfully locks at -11kHz from carrier, so at least the limiter fix in h1ioplsc0 seems to work; in principle the ADF sweep limiter is now set at +/- 1 MHz.
I added a quick ADF demod of the 64kHz OMC DCPD SUM channel into the normal ADF screen, screenshot attached, see the very bottom. New filter banks initialized with values and filters as in the other adf demod chains. Also tried to clean it up in SDF: channels are initialized, gains and phase are monitored, and saved into sdf (h1omcpi model).
