ARC Support

After some offline discussions, I outline what is required to have full support for the ARC acquisition electronics.

• A method that translates the .aqs format produced by the baseline client (pclient) into REST-for-Physics root file. Something similar to https://github.com/rest-for-physics/rawlib/blob/master/src/TRestRawMultiFEMINOSToSignalProcess.cxx.

• It appears that the frame format is no the same as in the mclient, so the old method wouldn't just work, there are some (hopefully small) modifications to be made.

• After this method has been implemented, the core logic can be copy-pasted into https://github.com/rest-for-physics/feminos-daq in order to decode the frames and build the .aqs and feminos-daq-format root files (in particular this is the section that needs modifying: https://github.com/rest-for-physics/feminos-daq/blob/main/src/root/storage.cpp).

• In order to process the feminos-daq-format root files into REST-for-Physics, the https://github.com/rest-for-physics/rawlib/blob/master/src/TRestRawFeminosRootToSignalProcess.cxx method should keep working just fine, as the feminos-daq-format root format is independant of the ARC/feminos, it just an event container for signals. The method should probably be renamed to include both the ARC and Feminos electronics though.

• Issue to track progress in the feminos-daq repo: https://github.com/rest-for-physics/feminos-daq/issues/19

Start with rawlib/src/TRestRawMultiFEMINOSToSignalProcess.cxx and compare its framing logic with the ARC .aqs format and the mclient format. Then inspect feminos-daq/src/root/storage.cpp and the existing TRestRawFeminosRootToSignalProcess.cxx. Done means ARC .aqs conversion and feminos-daq decoding are supported, with progress tracked in feminos-daq issue 19.