LUNA II Foto Umax = 50 - 400 kV LUNA 400 kV at LNGS: Imax = 650 A Emax = 0.07 keV allowed beams : protons, alphas LUNA II Foto
LUNA underground Laboratories LUNA 50kV LUNA 400kV LUNA underground Laboratories LUNA 2 site
BGO detector 4 summing chrystal 8000 2000 6000 4000 10 30 50 2000 Channels 20000 seeds Energy / keV 14N(p,)15O Simulation Energy / keV E>5.5 MeV: 4.4 cts/MeV/day 2000 4000 6000 8000 Background Spectrum Measured Underground 10 0 10 2 10 4 10 6 4096 Channels 12.5 days Near the Gamow peak: BGO detector 4 summing chrystal
target beam calorimeter
D(p,g) D(p,)3He LUNA data Ecm= 10 keV
D(p,)3He = 0.01 pbarn below the Gamow peak Ecm= 6 keV Viviani et al. PRC61 (2000) = 0.01 pbarn
P + d all D(p,)3He
Beam calorimeter beam cooling system gas from trap gas to pumps heater cold side hot side T = const. W0 = R-1 (Th-Tc) + Wloss Wbeam+ W = R-1 (Th-Tc) + Wloss Wbeam = W0 –W Ibeam = Wbeam/Ebeam without beam: with beam: (Wloss = const. at fixed T) heater (transistor, resistor, ..) provides W T is kept constant by a feedback system
windowless gas target I zeolite trap gas cleaner beam collimators turbo pump roots blowers target chamber p=0.3 mbar
Fig 1 nuovo acceleratore da 400 kV Fig 2 mappa laboratori sotterranei Fig 3 rivelatore BGO usato per la p+d Fig 4 rivelatore BGO + stadi pompaggio gas target Fig 5 in primo piano stadio pompaggio gas target, in alto rivelatore BGO (il fascio di protoni “entra” dal basso Fig 6 vista laterale di stadio pompaggio + BGO Fig 7 uno spettro dei fotoni da 5.5 MeV Fig 8 come sopra Fig 9 le misure esistenti Fig 10 dettagli sul calorimetro per la misura della corrente del fascio (da una misura di potenze termica depositata, nota l’energia Fig 11 shema gas target con ricircolo deuterio