GWADW2023 - Gravitational-Wave Advanced Detector Workshop

Session

Cryogenics

InfCry

26 May 2023, 16:00

Hotel Hermitage, La Biodola, Isola d'Elba

Conveners

Cryogenics

• Kazuhiro Yamamoto

Description

Cryogenics for future detectors

146. ET studies on Cryogenics and Vacuum for the Einstein Telescope detector.

Steffen Grohmann

26/05/2023, 16:00

Cryogenics

Presentation

We will reassert the scientific reasons for using cryogenics to increase the sensitivity of low-frequency ET, we will focus on studies related to the structure of cryogenic payload and superfluid helium cryostat, in addition to studies on cryo-pumps to be used in ET. We will conclude by presenting a brief review of cryogenic facilities under development at the various laboratories of...

48. Design development of the cryogenic pumps for the low frequency interferometer of the Einstein Telescope

Katharina Battes (KIT)

26/05/2023, 16:15

Cryogenics

Presentation

The Einstein Telescope (ET) is hosting interferometers to detect both low-frequency (LF) and high-frequency gravitational wave signals.
In order to reduce thermal noise, the main optics will partly be cooled to cryogenic temperatures below 20 K for ET-LF. Here, special measures are needed to mitigate frost formation on the cryogenic mirror, which is critical due to degradations of the optical...

125. Vacuum and cryogenic simulations for gravitational-wave interferometry

Henk Jan Bulten

26/05/2023, 16:30

Cryogenics

Presentation

The advent of future cryogenic wave detectors pose stringent criteria on noise from residual gas. Depending on the mirror temperature, different gas species may sublimate. Furthermore, the residual gas may cause optical path length changes in the arms and cause Brownian motion. The outgassing from gas from different surfaces (cables, thermal shields, vacuum vessels depends on the temperature...

112. Radiative modeling and cryogenic design for LIGO Voyager prototype

Radhika Bhatt (LIGO Laboratory, Caltech)

26/05/2023, 16:45

Cryogenics

Presentation

The proposed LIGO Voyager upgrade would require novel 2-μm interferometric techniques and radiative cooling of 200 kg silicon optics to cryogenic temperatures. Efficient cooldown to 123K is contingent upon strong radiative heat transfer between test masses and cold shielding. The strength of radiative coupling is largely dependent on surface emissivities, which must be high enough to offset...

109. Prototyping cryogenics development for ET at the Amaldi Research Center.

Mr Marco Ricci (Istituto Nazionale di Fisica Nucleare), Valentina Mangano (Istituto Nazionale di Fisica Nucleare)

26/05/2023, 17:00

Cryogenics

Presentation

Einstein Telescope nominal sensitivity, below 20 Hz, implies innovative technologies associated to cryogenics and revised mechanical design for test mass suspension. It is foreseen to cool the main optics and their suspensions down to 10-20 K. The use of solid thermal conduction and pulse-tube technology appears suitable if properly designed. The reduction of technical noise is demanding and...

17. Optical Absorption and Birefringence correlation in KAGRA Sapphire Test Masses

Matteo Leonardi (Università di Trento)

26/05/2023, 17:15

Cryogenics

Presentation

To reduce the impact of thermal noises in the sensitivity of gravitational wave detectors, cryogenic operation is planned for future 3G detectors such as Einstein Telescope and it is already implemented in the 2.5G detector KAGRA. To benefit from cryogenic operations, test masses substrate material needs to be changed from amorphous fused silica to crystalline material. The choice of KAGRA for...