AXIOMA Sviluppo di tecniche spettroscopiche su sistemi freddi

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 ke. V al me. V basati su Mezzi Attivi: -WP 1: Zeeman Type M 1 Transition Molecular Crystal -WP 2: Bloembergen Type Infrared Quantum Counter

WP 2: 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 4 fn 5 p 2 5 p 6 6 S 2 1 e. V = 8065. 54429 cm-1

0. 2 e. V

Rare earths sublevels 25 me. V

Basic Idea

YLF: Er (0. 01% e 1%)

WP 2 - Pisa • First year: – Growth of different crystals (YLF, GLF, YAG and Lu. AG) 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 me. V 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 BYF YVO Ho: – – • – BYF 0. 65% • Er: – – – YLF 0. 8% YLF 30% • LLF 8% LLF 12% BYF 5% BYF 12% Lu. AG 12% • KYF 10 1% YLF 0. 01%, 1% BYF 30% Pr: – – Yb: – – Tm: – – – • 1. 5% 1. 8% 3. 75% 0. 3% • Dy: Eu: – – – La. F 1% LLF 1. 25% YLF 5% 5% cd KYF 4 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 me. V

X- Ray Tube with Pb-shielded cabinet

Progetto 13

14

Cryo-cooler 15

Realizzazione attuale 16

Setup 17

Li. YF 3: 30% Ho 3+, Ho density: ~1023 ions/cm 3

YLF: Ho 30% 19

YLF: Ho 30% 20

YLF: Ho 30% 21

YLF: Ho 30% 22

BYF: Er 30% 23

BYF: Er 30% 24

BYF: Er 30% 25

BYF: Er 30% 26

BYF: Er 30% 27

People • • A. DI LIETO (50%) D. NICOLO’ (10%) M. TONELLI (50%) Azzurra Volpi (Ph. D) (30%), Giovanni Cittadino (Ph. D) (30%) Enrico Cataldo (T) (50%) Domenico MANICONE (Laureando) (100%) 1. 1+1. 5 FTE

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