JRA2 - IDEAJRA2 - IDEA

Zaragoza, 7.11.2005

Andrea Giuliani

University of Insubria (Como) and INFN - Milano

IDEA: presentation of the tasks IDEA: presentation of the tasks

I1 - Isotope enrichment

P1 - 82Se project

P2 - 150Nd project

B1 - Cosmogenic induced activity

B2 - Underground crystal growth

B3 - Rejection of surface radioactivity

B4 - Ge diodes in liquid nitrogen

promising nuclides

backgroundcontrol

Milestones/deliverables to be achieved within 31/3/2006Milestones/deliverables to be achieved within 31/3/2006

Financial situationFinancial situation

requested prefinancing for second 18 months [Apr 2005 - Sept 2006]

and expenses in [Apr 2005 - Sept 2005]

  2 3 4 6 8 9 11 15 16 20 21

  CNRS INFN UNIZAR CTU JYU MPIK EKUT MiniGRAIL FMFI-UK UCL IRMM

                       

requested- prefinancing 180000 204000 60000 6000 6000 115200 5900 27900 5900 0 4500

direct costs 300000 170000 50000 5000 5000 96000 4917 23250 4917 0 7500

                       

personnel 25583.63 28000 12931.19 0 0 24568.92 0 0 0 0 1225.65

equipment 154.1 901.35 240.4 0 3000 0 0 0 0 0 0

consumable 0 18693.97 0 222.3 0 519.46 0 0 0 0 0

travel 1500.33 2770.55 0 0 0 0 1712 0 0 0 2438.22

                       

total 27238.06 50365.87 13171.59 222.3 3000 25088.38 1712 0 0 0 3663.87

                       

ratio (%) total/prefin (d.c.) 9.079353 29.62698 26.34318 4.446 60 26.13373 34.81798 0 0   48.8516

B2 – Underground crystal growthB2 – Underground crystal growth

New contractor: IRMM

B2 – Ge crystal growthB2 – Ge crystal growth

IRMM (Geel) New contractor

UMICORE (Olen) Largest producerof Ge in the world

CANBERRA (Olen) Companyspecialized in semiconductordetector development

HADES (Mol) uderground lab (230 mof rock)

steps for Ge detector realization:

1. reduction of GeO2 (10 ppb impurities)

2. poly- and mono-zone refinement (1 and 0.01 ppb)

3. pulling (0.001 ppb)

4. diode fabrication

crystal growth

in principle, all the steps can be made undergroundin practice, too expensivegood alternative: minimize CR exposure between steps

CANBERRA

UMICOR

IRMMHADES

~ 10 km

B2 – Ge crystal growthB2 – Ge crystal growth

B2 – TeOB2 – TeO22 crystal growth crystal growth

4 detectors from CTI with final CUORE size will be ready in Feb 2006They will be operated in a clean environment after surface treatment

Recent effort to study the possibility of replacing Bridgman method(SICCAS) with Czochralski method (CTI, IPI)

get rid of Pt impurities from the crucible (190Pt is radioactive)

A 3x3x3 cm crystal procured from CTI company

The crystal was operated as a detector for two runs in Gran Sasso(Hall C refrigerator - R&D for DBD bolometers)

The technical bolometric performance was excellent

High surface radioactivity not possible to set meaningful limits onthe bulk impurities (U, Th, Pt)

B2 - R&D Contract between LLNL and CTIB2 - R&D Contract between LLNL and CTI

Phase 1 : Redesign of CTI furnace to grow 75 mm diameter TeO2 crystals (completed)

Phase 2:Production of one TeO2 crystal large enough for 5x5x5 cm cube (target date: 30/9 – 31/12)

Phase 3:Delivery of 4 each 5x5x5 cm finished TeO2 crystals (target date: 31/12/05 – 31/3/06)

Phase 4 : Successful test of 5x5x5 cm TeO2 crystals as bolometers at LNGS (within 10 weeks of delivery)

Important stimulus from IDEA:

- visit to CTI company and preliminary agreement- discussion on crystallization procedure- purchase of a 3x3x3 cm3 crystal

Need to work with them to develop clean procedures for crystal production

clean materials strict procedures clean room operation

Visit planned for Nov. 14

prepared list of topics to be discussed tour new production facility

B2 - SICCAS (Shanghai) optionB2 - SICCAS (Shanghai) option

B2 - SICCAS (Shanghai) discussion planB2 - SICCAS (Shanghai) discussion plan

Web site in progressWeb site in progress