luna ii foto u max = 50 - 400 kv luna 400 kv at lngs: i max = 650 a e max = 0.07 kev allowed beams:...

LUNA II Foto Umax = 50 - 400 kV

LUNA 400 kV at LNGS: Imax = 650 AEmax = 0.07 keV

allowed beams : protons, alphas

LUNA 2 site

LUNA 50kV

LUNA 400kV

LUNA underground Laboratories

Near the Gamow peak:

BGO detector

4 summing chrystal

8000 2000 6000 4000 0

10

30

50 2000 Channels20000 seeds

Energy / keV

14N(p,)15OSimulation

BGO detector

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 Channels12.5 days

target

beam

calorimeter

D(p,g)

Ecm= 10 keV

D(p,)3HeLUNA data

below the Gamow peak

Ecm= 6 keV

D(p,)3He

= 0.01 pbarn Viviani et al. PRC61 (2000)

D(p,)3He

P + d all

Beam calorimeter

beamcoolin

g syste

m

gas from trap

gas to pumps heater

cold sidehot 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 I I

I

I I

zeolite trapgas cleaner

beam collimators

turbopump

roots blowers

target chamber

p=0.3 mbar

Fig 1 nuovo acceleratore da 400 kVFig 2 mappa laboratori sotterraneiFig 3 rivelatore BGO usato per la p+dFig 4 rivelatore BGO + stadi pompaggio gas targetFig 5 in primo piano stadio pompaggio gas target, in alto rivelatore BGO (il fascio di protoni “entra” dal bassoFig 6 vista laterale di stadio pompaggio + BGOFig 7 uno spettro dei fotoni da 5.5 MeVFig 8 come sopraFig 9 le misure esistentiFig 10 dettagli sul calorimetro per la misura della corrente del fascio (da una misura di potenze termica depositata, nota l’energiaFig 11 shema gas target con ricircolo deuterio