------------------------------------- LAST UPDATED: April 2018 -------------------------------------
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How to use this page
This pages gives an overview of the shift. Click the links to go deeper.

Happy hunting!

Shift overview

  • You'll look at some plots in a run and decide if they look abnormal.
  • You'll write a brief report of your findings and save it in the logbook.
  • Then you'll mark both that you've completed checking the run, and that flag any defects.
  • Finally, you'll present a summary of your findings, consolidating defects across runs, in the DQ meeting. The more carefully you document as you go, the easier this will be!

But why are you doing this?
I mean, aside from your institute bugging you about OTP, why is this shift structured the way it is?
As data is collected, its reconstruction occurs at Tier-0, which is subdivided into multiple streams.
The express stream contains a subset (~10%) of the full data volume; it is reconstructed in quasi-real time, with the aim of obtaining results before the main reconstruction starts.
Currently, we are taking data with a 36 hour calibration loop, with, generally, only one long run per day.
There is a first pass of reconstruction on the Express stream (or ES1 in the web-display) and, once this has been reviewed, 36 hours later the full stream processing is started at Tier0 including any updates for cells to be masked, beamspot position, etc.
This full-stream processing is labeled as Bulk (or BLK in the web-display).

The duty of the shifter is to look at the first pass processing of the data in order to highlight any problems which can be solved in the bulk processing and then to check the bulk for the runs which have finished the processing to assess whether the problems have indeed been solved.

To clarify:

  • You'll look at each run twice:
    • Firstly, at 10% of the run, in the express stream.
    • Secondy, at 100% of the run in the bulk stream, which is available ~48 hours after the express stream.
  • Process the express stream the same day it becomes available.
  • Aim to process the bulk stream the same day it becomes available. DO NOT leave all of the bulk processing for the next shifter! smile

What you should know before your first shift

  • Know your responsibilities, e.g.
    • which defects should you set flags for?
    • when should you contact the CaloCombined experts and/or subdetector experts
    • which runs are you meant to process? Which can you leave for the next shifter?
  • Know how to get the information you need:
    • Do you know where to find the plots? The whiteboard? Who's on shift?
  • Know who your expert shifter is, the shifter in the week before you, the shifter in the week after.

Get started!

Details of how the shift works will be explained over the pages below. We suggest going through them in order.
Remember, the first few days of your first shift will likely take a bit if time as there is a lot of information to digest, but by mid-week you'll get into the swing of things.
If in doubt - poke your expert shifter!

-- RebeccaCarney - 2018-04-01

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Topic revision: r2 - 2018-04-02 - RebeccaCarney
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