331:, which all originate from the Super Proton Synchrotron. The primary proton beam (400 GeV/c and up to 1.5E13 protons per super cycle) is steered on a beryllium production target producing secondary hadrons, mainly consisting of (anti-) protons, pions and kaons. The production target and the experiment are separated by a 1.1 km long transfer line, allowing through weak decay and use of massive hadron absorbers the production of a naturally spin-polarised muon beam. The beam line is designed to transport beams up to a momentum of 280 GeV/c. Usually, five different beams are used by COMPASS:
418:, most of the final states and the scattered particles are created along the beam axis. This leads to the distinctive set-up of a fixed-target experiment: most detectors are placed behind the target ("forward spectrometer"). For some processes it is necessary to detect the recoil nucleon from the target. Here, a recoil proton detector consisting of two barrels of scintillator material is used. The protons are identified by the time of flight and the energy loss.
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The COMPASS experiment consists of two spectrometer stages with various tracking detector types, each set-up around a spectrometer magnet to determine the momentum of the particles. The first stage is dedicated to tracks with large scattering (production) angles and the second one for small angles.
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The timing and the position of the incident particles are determined with cold silicon strip detectors and scintillating fibre detectors. These informations are crucial to determine the interaction point inside the target material. Depending on the beam type, modifications in the beam telescope are
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physics, the spins of the target material need to be oriented in one direction. The target cell contains either ammonium or deuterium, which are polarised by the means of microwave radiation and strong magnetic fields. To keep up the polarisation grade, a He/He
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The COMPASS experiment was proposed in 1996 and approved by the CERN research committee. Between 1999 and 2001, the experiment was set up and finally in 2001, the first commissioning run was performed. Until the start of the
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physics, mostly liquid hydrogen is used, allowing to study the proton properties. For other physics, where high atomic numbers are needed, nickel, lead and other nuclear targets are used.
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with numerous tracking detectors, particle identification and calorimetry. The physics results are extracted by recording and analysing the final states of the scattering processes.
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The versatile set-up, the use of different targets and particle beams allow the investigation of various processes. The main physics goals are the investigation of the
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experiments, COMPASS was the largest data-taking experiment at CERN. It is also a pioneer in adopting new detector and readout technologies, such as
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is used to cool down the target material to 50 mK. The target material can be polarised longitudinal or transverse to the beam axis.
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The experiment consists of three major parts: the beam telescope, the target area and the two-staged spectrometer.
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detectors and most recently THGEM photon detection. The data taking is divided into the COMPASS I and II phases.
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Investigation of Charm
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Common Muon and Proton
Apparatus for Structure and Spectroscopy
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Common Muon and Proton
Apparatus for Structure and Spectroscopy
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To distinguish between the different particle types in the
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Safety of high-energy particle collision experiments
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Nucleon tomography (Deep
Virtual Compton Scattering)
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299:: universality of transverse momentum distribution
361:beam for calibration purposes (60 and 40 GeV/c).
245:u,d,s flavour decomposition of the nucleon spin
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510:List of Super Proton Synchrotron experiments
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275:The COMPASS II experiment in the North Area
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583:European Organization for Nuclear Research
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228:Construction of the COMPASS I experiment
539:, 25 July 2006 (accessed 26 June 2008).
315:Artistic view of the COMPASS experiment
252:Quark transverse momentum distribution
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1058:High Luminosity Large Hadron Collider
427:In addition, the first stage holds a
93:SPS Heavy Ion and Neutrino Experiment
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1201:Super Proton Synchrotron experiments
533:COMPASS homes in on the nucleon spin
1121:The Globe of Science and Innovation
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651:Large Electron–Positron Collider
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478:, scintillating fibre stations,
429:Ring-Imaging CHerenkov detector
386:, a Cherenkov detector is used.
522:Collaboration Official website
450:, gaseous electron multiplier,
292:Pion and kaon polarisabilities
242:Gluon polarisation in nucleons
1:
1141:Scientific committees of CERN
1106:Worldwide LHC Computing Grid
1035:Non-accelerator experiments
818:81 cm Saclay Bubble Chamber
169:at the M2 beam line of the
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527:COMPASS experimental setup
438:, micro mesh gas detector,
259:Search for exotic states:
136:Proton Synchrotron Booster
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1136:Directors-general of CERN
204:History and physics goals
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2328:Fixed-target experiments
1068:Future Circular Collider
690:Super Proton Synchrotron
262:Light meson spectroscopy
17:Super Proton Synchrotron
1063:Compact Linear Collider
699:List of SPS experiments
660:List of LEP experiments
601:List of LHC experiments
188:COMPASS experiment logo
167:fixed-target experiment
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307:Experimental Apparatus
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239:Nucleon spin structure
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194:nucleon spin structure
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165:") is a 60-metre-long
592:Large Hadron Collider
545:experiment record on
543:CERN-NA-058 (COMPASS)
402:dilution refrigerator
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2323:Particle experiments
1111:Microcosm exhibition
813:30 cm Bubble Chamber
442:Pixelised MicroMegas
302:d-Quark Transversity
827:Linear accelerators
265:Baryon spectroscopy
256:Pion polarisability
198:hadron spectroscopy
117:Linear accelerators
108:SPS preaccelerators
33:Key SPS Experiments
20:
1130:(2013 documentary)
873:Other accelerators
808:2 m Bubble Chamber
774:Proton Synchrotron
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146:Proton Synchrotron
53:Underground Area 2
43:Underground Area 1
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1077:Related articles
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885:AC (part of AAC)
880:AA (part of AAC)
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537:The CERN Courier
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63:NA31 Experiment
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957:CERN-MEDICIS
724:NA58/COMPASS
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282:(2012-2021)
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235:(2002-2011)
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179:spectrometer
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78:
798:PS215/CLOUD
547:INSPIRE-HEP
384:hadron beam
2312:Categories
803:Gargamelle
734:NA61/SHINE
490:Hodoscopes
436:MicroMegas
295:Polarised
280:COMPASS II
215:MicroMegas
397:polarised
377:muon beam
297:Drell-Yan
233:COMPASS I
127:(Linac 3)
1159:Category
1084:LHC@home
997:Miniball
992:LUCRECIA
987:ISOLTRAP
950:facility
504:See also
375:For the
359:electron
336:positive
113:p and Pb
1002:MIRACLS
962:COLLAPS
859:Linac 3
854:Linac 2
159:COMPASS
121:protons
79:COMPASS
1017:WISArD
972:EC-SLI
948:ISOLDE
864:Linac4
764:HOLEBC
670:DELPHI
631:MoEDAL
585:(CERN)
476:SciFis
469:Straws
391:Target
371:done:
2297:WA103
2292:WA102
2287:WA101
2282:WA100
1312:EMU20
1307:EMU19
1302:EMU18
1297:EMU17
1292:EMU16
1287:EMU15
1282:EMU14
1277:EMU13
1272:EMU12
1267:EMU11
1262:EMU10
1023:WITCH
924:n-TOF
906:PS210
849:Linac
844:CLEAR
834:AWAKE
704:AWAKE
692:(SPS)
665:ALEPH
653:(LEP)
641:FASER
636:TOTEM
611:ATLAS
606:ALICE
594:(LHC)
157:, or
89:SHINE
19:(SPS)
2273:WA99
2268:WA98
2263:WA97
2258:WA96
2253:WA95
2248:WA94
2243:WA93
2238:WA92
2233:WA91
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2223:WA89
2218:WA88
2213:WA87
2208:WA86
2203:WA85
2198:WA84
2193:WA83
2188:WA82
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2153:WA75
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2143:WA73
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2133:WA71
2128:WA70
2123:WA69
2118:WA68
2113:WA67
2108:WA66
2103:WA65
2098:WA64
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2078:WA60
2073:WA59
2068:WA58
2063:WA57
2058:WA56
2053:WA55
2048:WA54
2043:WA53
2038:WA52
2033:WA51
2028:WA50
2023:WA49
2018:WA48
2013:WA47
2008:WA46
2003:WA45
1998:WA44
1993:WA43
1988:WA42
1983:WA41
1978:WA40
1973:WA39
1968:WA38
1963:WA37
1958:WA36
1953:WA35
1948:WA34
1943:WA33
1938:WA32
1933:WA31
1928:WA30
1923:WA29
1918:WA28
1913:WA27
1908:WA26
1903:WA25
1898:WA24
1893:WA23
1888:WA22
1883:WA21
1878:WA20
1873:WA19
1864:WA18
1859:WA17
1854:WA16
1849:WA15
1844:WA14
1839:WA13
1834:WA12
1829:WA11
1824:WA10
1691:NA66
1686:NA65
1681:NA64
1676:NA63
1671:NA62
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1661:NA60
1656:NA59
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1545:NA40
1540:NA39
1535:NA38
1530:NA37
1525:NA36
1520:NA35
1507:NA34
1502:NA33
1497:NA32
1488:NA31
1483:NA30
1478:NA29
1473:NA28
1468:NA27
1463:NA26
1458:NA25
1453:NA24
1448:NA23
1443:NA22
1438:NA21
1433:NA20
1428:NA19
1423:NA18
1418:NA17
1413:NA16
1408:NA15
1399:NA14
1394:NA13
1385:NA12
1380:NA11
1375:NA10
1257:EMU9
1252:EMU8
1247:EMU7
1242:EMU6
1237:EMU5
1232:EMU4
1227:EMU3
1222:EMU2
1217:EMU1
1042:CAST
1012:VITO
967:CRIS
914:LEIR
900:LEAR
839:CTF3
793:BEBC
788:LEIR
776:(PS)
759:LEBC
754:BIBC
739:NA62
729:NA60
719:NA49
714:NA48
709:CNGS
675:OPAL
626:LHCf
621:LHCb
483:MWPC
448:GEMs
407:For
338:and
196:and
175:CERN
153:The
125:Lead
119:for
99:NA62
69:NA32
59:NA31
1819:WA9
1814:WA8
1809:WA7
1804:WA6
1799:WA5
1794:WA4
1789:WA3
1784:WA2
1775:WA1
1757:UA9
1752:UA8
1747:UA7
1742:UA6
1733:UA5
1724:UA4
1719:UA3
1714:UA2
1709:UA1
1370:NA9
1365:NA8
1360:NA7
1355:NA6
1350:NA5
1345:NA4
1340:NA3
1335:NA2
1330:NA1
1007:SEC
982:ISS
977:IDS
895:ISR
783:PSB
749:UA2
744:UA1
616:CMS
535:",
219:GEM
211:LHC
173:at
171:SPS
49:UA2
39:UA1
2314::
934:Sp
929:SC
890:AD
680:L3
217:,
142:PS
2277:2
2275:/
1868:2
1866:/
1779:2
1777:/
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1735:/
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1389:2
1387:/
1193:e
1186:t
1179:v
938:S
936:p
575:e
568:t
561:v
531:"
472:,
464:,
456:,
444:,
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