I am trying to recover data from an experimental run. The data should have been written to a TTree, with 5 branches (board, channel, timing, energy, flags) by the data acquisition system (DAQ) then saved in a ROOT file.
For the run in question, the TFile was created by the DAQ, and the file size is approximately as expected. (approx 8MB). However, when I try to access the data in the TFile, there is no TTree! I have tried using the
IsZombie() method that confirms the file IS NOT a zombie. However, when I call 'GetNkeys(), 0 is returned, whereas I would expect 1.
I attach a “good” file for reference, where the file contains the correct TTree. “DataR_CH0@N6724C_24302_Ac_225_no_ladder_no_foil_3.root”
The bad file, “DataR_CH0@N6724C_24302_Ac_225_no_ladder_no_foil_8.root”, is the file for which I wish to recover the data.
Each file is slightly too large to upload here, but can be found at the following link:
https:/ /zenodo . org / record / 8406399
Any advice or suggestions or things to test would be greatly appreciated.
ROOT Version: 6.26/04
Compiler: c++ (SUSE Linux) 7.5.0