2018-02-01 no-run summary¶

This page describes the evidence that the current data taken by MICE is sufficient to demonstrate the physics performance of the MICE cooling channel.

Data reviewed during data taking¶

The reconstructed data from ISIS user run 2017-03 was reviewed during data taking at a number of levels

• The shifters reviewed data in online monitoring, for low level DAQ, and online reconstruction, for higher level reconstruction output
• The hardware experts reviewed the controls software output to ensure the correct operation of the equipment, for example
  • Vacuum was checked to be good
  • Currents and pressures were consistent with proper operation of the magnets
  • Forces in the Focus Coil were consistent with proper polarisation of the magnets
• The detector experts reviewed the output reconstructed data to ensure that their subsystems were behaving correctly
  • The tracker team reviewed the digitisation efficiency following unplanned thermal cycling of the tracker readout; cable remapping efforts were undertaken and tracker experts validated the output reconstruction had good track-finding efficiency
  • The TOF team reviewed the digitisation efficiency. Space point finding inefficiency was isolated to calibration issues with the outer TOF pixels where the rate of incident electrons during calibration runs is small
• The physics team reviewed the experimental data from a higher level, ensuring consistency between detectors and expected physics results.
  • A subset of runs, one from most run configurations, was checked for reasonable chi2, particle loss, and change in amplitude between upstream and downstream detectors. The logging of run settings in the CDB and elog was checked and confirmed to be okay.

By the end of the data taking period, the operations and physics team were confident that the data taken was of an appropriate quality.

Post data-taking review¶

The data was further reviewed after the data taking period ended.

• The tracker group reviewed several sets of reconstructed data for each type of run and ensured that tracker performance was satisfactory. Details and plots for some runs are available here
• The TOF group reviewed reconstructed data and ensured that TOF performance was satisfactory. Details and some plots are here.
• The physics group reviewed a subset of data taken during the run period.
  • A subset of runs, one from most run configurations, was checked for reasonable tracker chi2, particle loss, and change in amplitude between upstream and downstream detectors. Details and plots are available here
  • A smaller subset of runs, from the 2017-02 7 cooling channel magnet configuration, was checked in detail for proper operation of the cooling channel. Details are available here

Benefits of not running¶

It might be tricky to get permission to run, while the benefits of not running are that the collaboration will be able to perform a detailed analysis of the equipment after running, such as:

• Survey of installed equipment
• In-situ magnetic field measurement