Cold Finger of Cryostat Micro Balance U=OkVT≈4K Thickness Detection of frozen van der W怕als Gas Layer Primary u Beam E≈4MeV Radiation Shield Muon Trajectories red:slow u,E≈15keV Moderator Frame (U15kV) blue:fast,unmoderated u Moderator:370 um Si Guard Ring (U≈12kW) 1st electrostatic Grid (U10kv) 2nd electrostatic Grid (U=0kV)
Electrostatlc tranaport system of the PSI low energy uSR apparatus MCP Detector Electrostatic Mirror Einzel lens Einzel lens Trigger Detector Einzel lens u Moderator low energy u E≈0-30KeV splitted conical lens accelerator/deccelerator and sample position
PSI Beamline parameters Surface Muon Intensity 700M/s(@1.9mAp)】 Accepted solid angle: 150 msr △plp(FWHM: 4.5%-8.5% Beam spot at moderator On Moderator 160M/s (before 20 M/s) Low Energy Muon Beam: LE-u*intensity at moderator 10000.20000/s LE-u*intensity at sample 3000.7500/s (before 400-800/s) Energy range 0.5-30keV Energy width 0.4 keV Impl.Range -1.200nm Polarization >92% Beam spot at Sample Spot size at sample -10-20mm Time Resolution for uSR 5.20ns T.Prokscha,E.Morenzoni,K.Deiters,F.Foroughi D.George,R.Kobler,A.Suter,V.Vrankovic, Phys.B374-375,460-464(2006) Total cost:~2.3 MFr.(Financial support by TU Braunschweig +U Konstanz(BMBF),U Birmingham(UK EPSRC),U Zurich,U Leiden)
PSI Beamline parameters