Speaker
Janusz Martyniak
(Imperial College London)
Description
The international Muon Ionisation Cooling Experiment (MICE) is designed
to demonstrate the principle of muon ionisation cooling for the first
time, for application to a future Neutrino Factory or Muon Collider. The
experiment is currently under construction at the ISIS synchrotron at
the Rutherford Appleton Laboratory, UK. As presently envisaged, the
programme is divided into three Steps: characterisation of the muon
beams (complete), characterisation of the Cooling Channel and Absorbers
(data-taking restarting in 2015-2016), and demonstration of Ionisation
Cooling (2017-2018).
The MICE Batch Reconstruction framework reconstructs all MICE data
recorded to date for a particular MICE Step, using a specified MAUS
version. Our job manager process holds a local SQLite database of MICE runs
already reconstructed with a given MAUS version; it repeatedly checks
against the MICE Metadata DB and on identifying data runs that have not
yet been reconstructed it will submit a job to the Grid to run MAUS
against that data run. For this we select from those Tier2 sites that hold
a copy of the raw data. The reconstructed data are stored on the SE at the site
where the job runs and registered in the LFC. On successful
reconstruction, the Grid job registers an FTS transfer request with a
separate File Transfer Controller (Web Service based) to copy the reconstructed
data to the Castor SE at RAL, where they are stored on tape. This decouples the FTS
transfer request and monitoring from the Grid job. After the output
has been transferred to the Castor SE at RAL, a corresponding record is
added to the MICE Metadata DB by the File Transfer Controller.
The MICE Metadata DB can then co-ordinate the further distribution of the
reconstructed data across the Grid, including to HTTP-enabled SE's to
allow MICE collaborators to access the data directly from any web browser.
Author
Janusz Martyniak
(Imperial College London)
Co-author
Henry Nebrensky
(Brunel University)
