AXIOMA Sviluppo di tecniche spettroscopiche su sistemi freddi per la rivelazione di Assioni Cosmologici Padova, Pisa, Legnaro, Napoli, Ferrara, Palermo, Cagliari

A New Class of Detectors Rivelatori di bassa energia dal keV al meV basati su Mezzi Attivi: -WP1: Zeeman Type M1 Transition Molecular Crystal -WP2: Bloembergen Type Infrared Quantum Counter

WP2: Infrared Quantum Counter Detectors Pisa: Crystal production and Infrared Emission Characterization under X-ray Irradiation Cagliari: Optical Amplification and Coherent Scintillation Mechanism Implementation Padova / Legnaro: Realization of Infrared Quantum Counter and Measurement of Efficiency

Rare earths in crystals 4fn 5p2 5p6 6S2 1 eV = 8065.54429 cm-1

0.2 eV

Rare earths sublevels 25 meV

Basic Idea

YLF: Er (0.01% e 1%)

WP2 - Pisa First year: Second and third year: Growth of different crystals (YLF, GLF, YAG and LuAG) doped with Nd, Pr, Er and Ho for all partners Evaluation of the material quality by spectroscopic and structural analysis Set-up of catodoluminescence apparatus with a X-ray source (continuous and pulsed) and a crystal target at 4 K Second and third year: Catodoluminescence measurements in the 80-600 meV range with continuous and chopped X-ray source Evaluation of the best materials and doping level to obtain the best population level excited by X-ray Evaluation of the absorption cross section value of the excited levels

Cristalli cresciuti e distribuiti Nd: YLF 1.5% BYF 1.8% BYF 3.75% YVO 0.3% Ho: YLF 0.8% YLF 30% Tm: LLF 8% LLF 12% BYF 5% BYF 12% LuAG 12% Er: KYF10 1% YLF 0.01%, 1% BYF 30% Dy: BYF 0.65% Pr: LaF 1% LLF 1.25% Yb: YLF 5% YLF 5% cd Eu: KYF4 0.1% YLF 0.01% YLF 1%

Setup catodoluminescenza Cryocooler 4 - 300 K X-Ray Source Crystal sample Modulatore Lens or Fiber Monochromator Cooled Detector Lock-in Amp. + Computer Detection Range : 80 - 600 meV

X- Ray Tube with Pb-shielded cabinet

Progetto

Cryo-cooler

Realizzazione attuale

Setup

LiYF3: 30% Ho3+, Ho density: ~1023 ions/cm3

YLF: Ho 30%

YLF: Ho 30%

YLF: Ho 30%

YLF: Ho 30%

BYF: Er 30%

BYF: Er 30%

BYF: Er 30%

BYF: Er 30%

BYF: Er 30%

People 1.1+1.5 FTE A. DI LIETO (50%) D. NICOLO’ (10%) M. TONELLI (50%) Azzurra Volpi (PhD) (30%), Giovanni Cittadino (PhD) (30%) Enrico Cataldo (T) (50%) Domenico MANICONE (Laureando) (100%) 1.1+1.5 FTE

Richieste alla sezione: … Aspetto finanziario 2016: Consumo: 15 kE (richiesti 20 kE) Inventario: 25 kE (richiesti 30 kE, s.j.) Apparati: 5 kE (richiesti 5 kE) Totale : 45 kE + 1 kE missioni 2017: Consumo: 14 kE Inventario: 20 kE Totale: 34 kE + missioni 2018: Consumo: 12 kE Inventario: 3 kE Totale: 15 kE + missioni Richieste alla sezione: …