COmmon Muon Proton Apparatus for Structure and Spectroscopy
|SPS experiment NA58||safety|
COMPASS is a high-energy physics experiment at the Super Proton Synchrotron (SPS) at CERN in Geneva, Switzerland. The purpose of this experiment is the study of hadron structure and hadron spectroscopy with high intensity muon and hadron beams.
On February 1997 the experiment was approved conditionally by CERN and the final Memorandum of Understanding was signed in September 1998. The spectrometer was installed in 1999 - 2000 and was commissioned during a technical run in 2001. Data taking started in summer 2002 and continued until fall 2004. After one year shutdown in 2005, COMPASS resumed data taking with a muon beam in 2006 and 2007. The years 2008 and 2009 were dedicated to the COMPASS hadron spectroscopy programme with pion and proton beam. In 2010 and 2011 spin structure function measurements with a polarised proton target were performed.
In 2010 an extension of the COMPASS program has been approved by the CERN Research Board. It consists in a set of measurements to study the structure of hadrons in Deep Virtual Compton Scattering (DVCS), Hard Exclusive Meson Production (HEMP), SIDIS, Polarized Drell-Yan and Primakoff reactions. Further investigations in the field of hadron spectroscopy were envisaged as well. On January 2013 a new Memorandum of Understanding was signed, in order to fulfill this program. In 2012 the data to study the Primakoff reaction were taken. The first (pilot) run for the DVCS measurement was also achieved. The first-ever polarised Drell-Yan measurement with a beam of negative pions and a polarised proton target was succesfully performed in 2015. Now the experiment has been modified for the 2016/2017 GPD runs with a liquid hydrogen target and a muon beam.
Nearly 220 physicists from 13 countries and 24 institutions work in COMPASS.
|Who is who and Responsibilities||GPD run 2017 (2016)|
|Drell-Yan run 2014, 2015|
|Institutes||Muon run 2011, 2010|
|Members (COMPASS I)||Hadron run 2012, 2009, 2008, old|
|Collaboration Board||Muon run 2007, 2006, 2004|
|Technical Board||An online event display|
|Home Pages||The M2 beam line|
|Summer Students||Electronic logbook|
|Mailing & Discussions||COMPASS Wiki|
|Election 2013 2015 2017||CDR status
|New logbook (test)
Artistic view of the 60 m long COMPASS two-stage spectrometer. The two dipole magnets are indicated in red.
|Compass Set-up||Analysis Meetings|
|Compass Gallery||Compass Notes|
|Hadron analysis||FE meetings|
|USEFUL LINKS||CERN PAGES|
|My Mail and More||CERN Map/Buildings|
|CERN||Experiments at CERN|
|High Energy Physics||CERN Stores|