Post on 26-Mar-2015
STREGA
C2:Cryogenic suspension system for advanced resonant detectors (5 MIN)
Task -C2: development and construction of advanced cryogenic system for resonant detectors;
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.
Participants:
INFN* - Istituto Nazionale di Fisica Nucleare MiniGRAIL - 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 microW-Hydrogen? 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
STREGA
To 50 mK shield
To mixing chamber
CryogenicsThermal anchoring suspension
To still shield
STREGACryogenicsThermal anchoring suspension
STREGA
C2:Cryogenic suspension system for advanced resonant detectors (5 MIN)