ROG 10

1
ROG (10)
CSN2 8 Giugno 2004

• Eugenio Coccia
• INFN Gran Sasso and U. of Rome Tor Vergata

2
LNL INFN
Leiden
MiniGrail
CERN RE 5
LNF INFN
3
EXPLORER Duty cycle gt 90
NAUTILUS 2004 Duty cycle gt 90
T noise 690 mK
4
Leida, 29 maggio 2004
5

• ROG - Spherical detectors
• INFN LNF, Roma1, Roma2 LNGS, Genova
• INAF IFSI
• CNR IFN Roma
• Leiden Kamerlingh Onnes Lab. Univ. Geneva, CERN
• Study of the coupling of resonant transducers
  with the sphere modes
• on a realistic scale (miniGrail)
• Study of the effect of cosmic rays at the Dafne
  Beam Test Facility (RAP)
• Determination of the welding technique
• Optimization of transducers and dc SQUID
  amplifiers
• Study of the observatory capability

6
GOAL Large Spherical Detector possibly
underground

• Detecting collapses and
• chirps _at_ 200Mpc
• in coincidence with VIRGO
• Determining
• Source direction
• Chirp mass
• ??????????????????????
• ?gw 10-9

7
A chirp signal excites the two modes at different
times This double passage technique determines
the chirp mass.
Goal Large hollow sphere
D 4.8 m f1300 Hz f21000 Hz SQL
Collapses and chirps _at_ 200Mpc ?gw 10-9
8
ME Inv. Cons.
LNF 10 10 17 Roma2 16
8
8
14