...

Lane[0].VC[0] = Data[0]
Lane[1].VC[0] = Data[1]
Lane[2].VC[0] = Data[2]
Lane[3].VC[0] = Data[3]

Lane[5].VC[0] = SRPv3
Lane[5].VC[1] = software trigger (ssiCmd)
Lane[5].VC[2] = XVC
-Lane[6].VC[0] = slow monitoring[1:0]
-    [1] = Power and Communication Board
-    [0] = Digital Board


Lane[11] = LCLS-II Timing

Pedestal Scans and Charge Injection

As you mentioned, this detector only has one gain mode, which is an outranging mode. However, the idea is to create two additional “fixed gain modes” currently referred to as soft fixed modes. These modes are created by changing the switching point of the auto-ranging mode. So for the SL, the switching point is moved below the baseline and we are always switched, and for SH the switching point is all the way up the dynamic range, so the detector never switches.  As such, unlike the current generation of epix detectors which moves between gain modes by changing the tr_bit and the pixel config matrix value (ePixM do not contain registers that change the functionality of the pixels),  the soft gain modes will be moved into by changing the following registers:

Here the CompTH_ePixM register defines the location of the switching point. The values of these registers are subject to change as we start to characterize the detector and might change a bit when we optimize the performance. So, for a pedestal script, we would likely want to cycle through these settings and collect ~2000 frames in each cycle to determine their relative pedestal maps (AHL, SH,SM).

For the charge injection, that is also a new beast for this detector. Unlike the previous detectors, we are not injecting an external signal, but switching an already charged capacitor. This has been implemented in a way that charge injection occurs for all pixels in column in one go. I talked to Dionisio and Lorenzo and they will ask Dawood to provide some documentation on how you make charge injection happen for this detector. Also, unlike the previous detectors where we performed charge injection on a central pixel, with no charge injection on its neighbor, and then cycled through all pixels so they all receive charge injection, here we will be performing charge injection on a combination of columns simultaneously and stepping through, but Dionisio and Lorenzo wanted to cycle around how to do this and then get back to you.