The run is aimed at semi-inclusive deep-inelastic scattering (SIDIS) of muons off transversely polarised 6LiD target, as described in our proposal. The experiment is located in the Experimental Hall North 2 (EHN2), building 888, on the Prévessin site of CERN.


23. 7. After some complications the pumping line is back in place and being leak-checked.
3. 7. Accident – 3He pumping line collapsed, it is going to be replaced in about a week. It will delay the physics data taking by roughly 3 weeks. Spectrometer commissioning continues as planned.
21. 6. In situ test of the target holder has shown no leak. We are back on track! [Planning]
9. 6. Presentation on the SPCS meeting open session by Fulvio Tessarotto [Indico].
20. 5. Serious polarized target problem occured, investigations are ongoing [CM page]

Run schedule

31. 5. Dry run Set up and test detector front-ends.
28. 6. Commissioning First beams for NA commissioning.
12. 7. Beam to NA for physics. Spectrometer commissioning with beam.
?. 8. Physics data taking starts
6. 10. End of the run

Important contacts

Calling from outside CERN:

The data are taken from the CMAD2012 MySQL database on pccodb00 and can be updated there.

Showing active roles on 23. 07. 2021 . Show the whole run.

Responsibility Name Phone numbers
Control room (892-R-D10) 7 8058
DEXSO/Gas TESSAROTTO Fulvio 16 4826
EXSO LEVORATO Stefano 16 4850
Run Coordinator MATOUŠEK Jan 16 0810, +420736663300
Spokesperson PARSAMYAN Bakur 16 4463
Spokesperson TESSAROTTO Fulvio 16 4826
Technical Coordinator LEVORATO Stefano 16 7431, 16 4850
Week coordinator BARTH Jens (164863), 16 0912
SPS Control Room (CCC) 7 7500
Polarised Target Coordinator DOSHITA Norihiro 16 8996
DAQ FROLOV Vladimir 16 5994, 6 5098
DCS PIRES Christophe 16 4872, 6 6506

Useful links

Experimental setup

COMPASS setup, upstream half

COMPASS setup, upstream half

COMPASS setup, downstream half

COMPASS setup, downstream half

The experimental setup consists of a beam telescope, solid-state transversely 6LiD target and a two-stage magnetic spectrometer. The spectrometer has wide angular coverage and robust tracking. Particle identification is ensured by muon filters and a RICH detector. It contains also electromagnetic and hadronic calorimeters.