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Add convenience interface for frequent special runs

Description

The GEM DAQ software user should be able to easily configure the system to take special runs, such as those with low THR_ARM_DAC (i.e. 0 or 1). Modifying the VFAT configuration is not really an option for frequent operations; it is highly manual and error-prone. Such a feature is an important step for the GEM DOC to participate more actively in the data-taking activities.

Possible fixes

Multiple ideas come to mind:

  1. Use the threshold scan with appropriate parameters. This is error-prone and requires modification in the DPG workflow.
  2. Add a new kind of scan. This requires modification in the DPG workflow.
  3. Allow the user to override some relevant parameters (for now the THR_ARM_DAC) during Physics runs.

Option 3 would be preferred since the impact is minimal.