ETO Task Force on the detector layouts meeting (in-person)

18 Feb 2025, 09:00 → 20 Feb 2025, 18:30 Europe/Rome

Scuola Normale Superiore

Einstein Telescope (ET) is the European project for a third generation gravitational waves observatory, which will shed light on many open questions of fundamental physics and cosmology. Compared to the current, second-generation laser-interferometric detectors Advanced Virgo and Advanced LIGO, ET will achieve a greatly improved sensitivity by increasing the size of the interferometer from 3÷4 km to 10÷15 km arm length, and by implementing a series of new technologies. In particular, placing the detector underground and cooling the test masses to cryogenic temperatures will be essential to boost the low frequency sensitivity by mitigating seismic, Newtonian, and thermal noise.

ET was included in the 2021 update of the European Strategic Forum for Research Infrastructures (ESFRI) roadmap.

The investment for ET construction will be dominated by the cost of underground civil infrastructure. A preliminary costing will be based on engineering studies carried out by specialised companies employed by the teams preparing possible ET sites.

A dedicated task force was recently set up by the ET Organisation (ETO) to optimize the detector layouts of ET and the preliminary costing for the civil infrastructure while maintaining ET’s scientific performance.

The task force will examine the cost and technical risk corresponding to different options for the detector layout; the proposed layouts should allow sufficient flexibility to account for unknowns in technical design details.

The Pisa meeting will bring together instrument scientists (opticians and experts in critical technologies for seismic isolation, cryogenics, ultra-high vacuum) and engineers to generate a first update of the ET detector layout. The output from the different discussions (simulation code, figures, graphs, etc.) can be collected in the GitLab repository: GitLab .

 

Meeting flyer

Tuesday 18 February

09:30 → 09:40 Welcome

Convener: Prof. Giovanni Losurdo (SNS)

09:40 → 12:20 Review of identified working configurations and background information

Convener: Fiodor Sorrentino (Istituto Nazionale di Fisica Nucleare)

09:40 Outcome of configuration brainstorming

Speaker: Fiodor Sorrentino (Istituto Nazionale di Fisica Nucleare)

Outcome of configuration brainstorming-3.pdf

09:55 Latest results in optical layout

Speakers: Anna Green (Nikhef, VU), Marco Vardaro (University of Amsterdam - Nikhef)

OpticalLayout_UpdateToTaskforceFeb25.pdf

10:10 Baseline 2L detector layout

Speaker: Max Majoor (Nikhef)

ETO_Task_Force_-_Baseline_2L_Detector_Layout_[Summarized].pptx

10:25 Beampipe interfaces

Speaker: Patrick Werneke (ETO - Nikhef)

Main arm cavity tunnel diameter Taskforce 18Feb25.pptx

10:40 Cryogenic system options

Speaker: Fulvio Ricci (Istituto Nazionale di Fisica Nucleare)

ET-Cryog-WP4-Task-Force-meeting Feb2025-v3.pdf

11:00 coffee break

11:30 Preliminary criteria for civil infrastructure costing

Speaker: Jonathan Bratanata (Nikhef)

250218_Cost Estimation_Pisa Meeting.pptx

11:50 Noise budget

Speaker: Valeria Sequino (INFN sez. Napoli, Università degli Studi di Napoli "Federico II")

NoiseBudget_ValeriaSequino.pdf

12:05 Science case

Speaker: Ulyana Dupletsa (Istituto Nazionale di Fisica Nucleare)

Dupletsa_1st_ETO_meeting.pdf

12:20 → 13:15 Workshop organisation

Convener: Fiodor Sorrentino (Istituto Nazionale di Fisica Nucleare)

12:20 System decomposition and requirements management

Speaker: Romano Meijer (Nikhef)

Taskforce_pisa_decomp_reqs.pptx

12:40 Tasks assignment

Speaker: Fiodor Sorrentino (Istituto Nazionale di Fisica Nucleare)

Tasks assignment-1.pdf

13:00 Documenting sessions output

Speaker: Benoît Tuybens (Nikhef - ETO directorate)

13:10 Practical information

Speaker: Fiodor Sorrentino (Istituto Nazionale di Fisica Nucleare)

13:15 → 14:30 Lunch

14:30 → 17:30 Optical layout

Conveners: Anna Green (Nikhef, VU), Marco Vardaro (University of Amsterdam - Nikhef)

14:30 LF filter cavities in X arm tunnel

Rolling agenda 18/02

15:45 coffee break

16:15 HF filter cavity & HF IMC in Y arm tunnel

14:30 → 17:30 Tower integration

Conveners: Dr Leonardo Lucchesi (Istituto Nazionale di Fisica Nucleare), Romano Meijer (Nikhef)

Rolling agenda 18/02

14:30 Tower categorisation review - LF TM

Reference documents

15:45 coffee break

16:15 Tower categorisation review - other optics

17:30 → 18:30 Social event:guided tour of Palazzo della Carovana and Torre Ugolino

Wednesday 19 February

09:00 → 10:20 Summary of results from first day

Conveners: Anna Green (Nikhef, VU), Dr Leonardo Lucchesi (Istituto Nazionale di Fisica Nucleare), Marco Vardaro (University of Amsterdam - Nikhef), Romano Meijer (Nikhef)

OpticalLayout_Feb25TaskforceDay1.pdf

Rolling agenda

Taskforce_pisa_tower_cat.pptx

10:20 → 10:50 coffee break

10:50 → 13:15 Detector layout

Conveners: David Lucchesi (Istituto Nazionale di Fisica Nucleare), Romano Meijer (Nikhef)

10:50 Options in tower design

Rolling agenda 18/02 follow-up

10:50 → 13:15 Science case

Convener: Valeria Sequino (INFN sez. Napoli, Università degli Studi di Napoli "Federico II")

10:50 Verification of scientific requirements on baseline and optional technologies

Rolling agenda 19/02

13:15 → 14:30 Lunch

14:30 → 17:30 Civil infrastructure

Convener: Jonathan Bratanata (Nikhef)

14:30 Cost breackdown evaluation with filter cavities in arm tunnels

Rolling agenda 19/02

15:45 coffee break

16:15 Cost breackdown evaluation with filter cavities in arm tunnels

14:30 → 17:30 Optical layout

Convener: Anna Green (Nikhef, VU)

14:30 Vertex reshuffling for KAGRA-like double cavern concept

Rolling agenda 19/02

15:45 coffee break

16:15 Vertex reshuffling for KAGRA-like double cavern concept

20:00 → 22:00 Social Dinner

Thursday 20 February

09:00 → 10:00 Summary of results from first day

Conveners: Anna Green (Nikhef, VU), Jonathan Bratanata (Nikhef), Max Majoor (Nikhef), Valeria Sequino (INFN sez. Napoli, Università degli Studi di Napoli "Federico II")

OpticalLayout_Feb25TaskforceDay1.pdf

Rolling agenda

Taskforce_pisa_tower_cat.pptx

10:00 → 13:15 Detector layout

Convener: Max Majoor (Nikhef)

10:00 Detector layout update with filter cavities in main arms

Rolling agenda 20/02

11:00 coffee break

11:30 Vertex reshuffling for KAGRA-like double cavern concept

10:00 → 13:15 Technical risk analysis

Convener: Ghada Mahmoud (APC)

Rolling agenda 20/02

10:00 TRL of critical technologies

TRL excercise

11:00 coffee break

11:30 Risk analysis on global configuration

12:30 Flexibility evaluation

13:15 → 14:30 Lunch

14:30 → 15:45 Civil infrastructure

Convener: Jonathan Bratanata (Nikhef)

14:30 Preliminary cost estimation with vertex reshuffling for KAGRA-like double cavern concept

Rolling agenda 20/02

14:30 → 15:45 Science case

Convener: Dr Francesco Iacovelli (University of Geneva)

14:30 Coarse evaluation of performance risk

Rolling agenda 20/02

15:45 → 16:15 coffee break

16:15 → 17:30 Wrap up, conclusions, and action items

Convener: Fiodor Sorrentino (Istituto Nazionale di Fisica Nucleare)

Rolling agenda 20/02

Wrap up and next actions.pdf