STREGA
C2:Cryogenic suspension system for
advanced resonant detectors (5 MIN)
The double task of removing the heat from the antenna resonator while keeping it mechanically isolated from the
environment is similar to the one that will be encountered in the cooling of the interferometer mirrors. Although the
ultra cryogenic detectors have been successfully operated, further advances in cooling and/or isolating the
antenna can be achieved via finite element modelling and experimental tests.
Objective:
- Two 1.2 ton spheres with their cryogenic suspension assembled and measurements of mechanical quality factor
and thermal noise at low temperatures performed.
Task -C2: development and construction of advanced cryogenic system for resonant
detectors;
Participants:
INFN*
MiniGRAIL
*
-
Istituto Nazionale di Fisica Nucleare
Leiden University – LION Institute of Physics
Involved labs:
Ferrara, Firenze, Genova, Frascati, Legnaro, Napoli, Padova, Perugia, Pisa, Roma 1, Roma 2, Trento, Urbino
STREGA
C2:Cryogenic suspension system for
advanced resonant detectors (5 MIN)
STREGA
C2:Cryogenic suspension system for
advanced resonant detectors (5 MIN)
Cooling MiniGRAIL
78 mK after 37
days. Heat leak of
about 50 microWHydrogen? Internal
stresses?
STREGA
MiniGRAIL
Material
CuAl6%
Diameter
 = 0.65 m
Mass
M = 1150 kg
Resonant freq.
f = 3160 Hz
Goal temperature ~ 20 mK
Expected sensitivity h~10-20
STREGA
Vibration Isolation System
STREGA
Vibration Isolation System
STREGA
Vibration Isolation System
30 dB
around 3 kHz
70 dB
around 3 kHz
STREGA
Vibration Isolation System
STREGA
Vibration Isolation System
STREGA
Vibration Isolation System
STREGA
Vibration Isolation System
Cryogenics
STREGA
Thermal anchoring suspension
To still shield
To 50 mK shield
To mixing chamber
Cryogenics
STREGA
Thermal anchoring suspension
STREGA
C2:Cryogenic suspension system for
advanced resonant detectors (5 MIN)