Status & plans of the CAST experiment
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107 th Meeting of the SPSC 23/10/2012. Status & plans of the CAST experiment. Thomas Papaevangelou CEA Saclay On behalf of the CAST Collaboration. Outline. Introduction - CAST physics Status report S hutdown in 2011 – 2012 Buffer gas CFD GRID – tracking Filming - PowerPoint PPT Presentation
Transcript of Status & plans of the CAST experiment
Updated Micromegas Analysis
Status & plans of the CAST experimentThomas PapaevangelouCEA SaclayOn behalf of theCAST Collaboration
107th Meeting of the SPSC
23/10/2012
OutlineIntroduction - CAST physics
Status reportShutdown in 2011 2012Buffer gasCFDGRID tracking FilmingDatataking 2012Detector performanceAnalysis status
Request for running in 2013-2014Physics Axions/ALPsSub-keV WISPs ChameleonsDetectorsRequest to CERN
Conclusions2Thomas Papaevangelou107th SPSC Meeting 22/10/2012
CAST Physics3Thomas Papaevangelou107th SPSC Meeting 22/10/2012
Axion flux on earth
Ea = 4.2 keV4The la Sikivie helioscopeCAST sensitivity per detector
0.3 counts/hour forga= 10-10 GeV-1 and A = 14.5 cm2Axions would be produced in the Suns core and re-converted to X-rays inside an intense magnetic field. P. Sikivie, Phys. Rev. Lett. 51, 14151417 (1983)
Expected signal
X-Ray excess during solar alignmentat 1-10 keV regionSolar axion luminosity
Expected number of photons: Thomas Papaevangelou107th SPSC Meeting 22/10/2012
CAST5
LHC test magnet2 Micromegas detectorsMicromegas&CCD/Telescope4 magnet bore exits to look for X-rays CAST is using a prototype superconducting LHC dipole magnet able to track the Sun for about 1.5 hours during Sunrise and Sunset.Operation at T=1.8 K, I=13,000A, B9T, L=9.26m
Thomas Papaevangelou107th SPSC Meeting 22/10/2012
CAST Sensitivity6
New discovery potential for each density (pressure) settingAxion to photon conversion probability:
Vacuum:=0, m=0For CAST phase I conditions (vacuum), coherence is lost for ma > 0.02 eV.
With the presence of a buffer gas it can be restored for a narrow mass range:
Coherence condition: qL < ,
with
Thomas Papaevangelou107th SPSC Meeting 22/10/2012
Physics Program & main results7
Proposal approved by CERN (13th April 2000)Commissioning(2002) CAST Phase I: vacuum operation (2003 - 2004) completed CAST Phase II: (20052011)4He run, (20052006) completed 0.02 eV < ma < 0.39 eV3He run (2007-2011) completed ongoing analysis 0.39 eV
