BTW3

Date & Time	Session	Session Information	Location	Topic(s)	Moderator(s)
30 Sep 2025, 08:00	Continental Breakfast	Third international workshop on beamtubes for next-generation groundbased gravitational wave detectors, held 30 September through 2 October, 2025 at LIGO Hanford.	LIGO Hanford, LSB Lobby	Cosmic Explorer	Eadie Balint
No agenda yet
30 Sep 2025, 08:30	Welcome, Introduction and Purpose			None
Start Title Author(s) Topic(s) File(s) Length 08:30 Welcome to LIGO Hanford Michael Landry None None 00:05 08:35 Opening Remarks from the LIGO Executive Director David Reitze None None 00:05 08:40 Workshop Overview Michael Zucker None None 00:05 08:45 Summary of Workshop II at CERN (2023) Fred Dylla Cosmic Explorer Vacuum None 00:15 09:00 Cosmic Explorer: Project Update and Vacuum Requirements Matthew Evans None None 00:30 09:30 Einstein Telescope: Project Update and Vacuum Requirements Tomasz Bulik None None 00:30
30 Sep 2025, 10:00	Break		LSB Lobby
30 Sep 2025, 10:15	LHO Site Tour		LSB Lobby (departure & return)	None	Michael Landry
No agenda yet
30 Sep 2025, 12:30	Lunch		LSB Lobby	None	Eadie Balint
No agenda yet
30 Sep 2025, 13:30	Design Space Trade-Offs: Vacuum Materials and Fabrication		LSB Auditorium	None
Start Title Author(s) Topic(s) File(s) Length 13:30 Candidate Beam Tube Materials Vacuum Properties (Carlo Scarcia, CERN) None None 00:45 14:15 Fabrication and Assembly Trade-offs Michael Zucker None None 00:45
30 Sep 2025, 15:00	Break		LSB Lobby
30 Sep 2025, 15:15	Day 1 Summary and Working Group Organization	Summary Discussion of Day 1 Working Group Organization	LSB Auditorium	None
No agenda yet
30 Sep 2025, 15:45	Day 1, Working Group 1 Breakout: Materials, Surface Treatments and Outgassing		LExC Classroom	None
No agenda yet
30 Sep 2025, 15:45	Day 1, Working Group 2 Breakout: Design, Fabrication and Assembly	Day 1 will focus on design	LSB Auditorium	None	Dennis Coyne
Start Title Author(s) Topic(s) File(s) Length 15:45 Design specifications & tube design overview for CE Dennis Coyne None None 00:15 16:00 Design specifications & tube design overview for ET (Marco Marrone, CERN) None None 00:15 16:15 Principal cost factors (based on LIGO BT fabrication data) Dennis Coyne None None 00:15 16:30 Optimized corrugated tube design Alberto Franco-Ordovas None None 00:15 16:45 Thick-walled Carbon Steel Tube Alternative for CEBEX/CE Anna Iudintseva None None 00:15
30 Sep 2025, 15:45	Day 1, Working Group 3 Breakout: Scattered Light Isolation and Baffles		OSB Multipurpose Room	None	Matthew Evans MARIO MARTINEZ
No agenda yet
30 Sep 2025, 18:30	Group Dinner		Tagaris Winery	None
No agenda yet
01 Oct 2025, 08:00	Continental Breakfast		LSB Lobby	None
No agenda yet
01 Oct 2025, 08:30	Design Space Trade-Offs: Stray Light		LSB Auditorium	None	MARIO MARTINEZ
Start Title Author(s) Topic(s) File(s) Length 08:30 Design Drivers for Scattered Light Baffles Antonios Kontos None None 00:35 09:05 Mechanical/Optical Considerations for Baffles Marc Andres-Carcasona None None 00:35 09:40 Stray light noise from particulate contamination in ground based GW interferometers Livia Conti None None 00:35
01 Oct 2025, 10:15	break		LSB Lobby
01 Oct 2025, 10:30	Experimental Program Reports			None	Melina Fuentes-Garcia
Start Title Author(s) Topic(s) File(s) Length 10:30 CEBEX Michael Zucker None None 00:30 11:00 ET Pilot Sector of the ET Vacuum Pipe (Ana Teresa Fontenla, CERN) None None 00:30 11:30 Contribution of CNRS-LAPP to the ET Vacuum Pipe Prototyping (Alexander LaCroix, CNRS) None None 00:30
01 Oct 2025, 12:00	Lunch		LSB Lobby	None
No agenda yet
01 Oct 2025, 13:00	Day 2, Working Group 1 Breakout: Materials, Surface Treatments and Outgassing		LExC Classroom	None
No agenda yet
30 Sep 2025, 13:00	Day 2, Working Group 2: Design Fabrication and Assembly	Day 2 will continue Design discussions and then transition to Fabrication topics	LSB Auditorium	None	Dennis Coyne
Start Title Author(s) Topic(s) File(s) Length 13:00 Dennis Coyne None None 00:15 13:15 Dennis Coyne None None 00:15 13:30 Design proposal of tube supports, end caps and pump port spools for CE Anna Iudintseva None None 00:15 13:45 Design proposal of tube supports for ET (Roxana Mister, CERN) None None 00:15 14:00 Group discussion regarding Design None None 00:45 14:45 Overview of manufacturing techniques for corrugated vs. ring-stiffened chambers (Marco Morrone, CERN) None None 00:15 15:00 MACBETH: Manufacturing and Cleanliness of Beampipe for ET in High Vacuum (Fabian Quinten, NIKHEF) None None 00:15 15:15 Opportunities/concepts for automation to increase rate and/or lower costs (TBD) None None 00:15 15:30 QA/QC on welds, cleanliness, and leak-tightness after fabrication (TBD) None None 00:15 15:45 Group Discussion regarding Fabrication None None 00:45
01 Oct 2025, 13:00	Day 2, Working Group 3: Scattered Light Isolation and Baffles		OSB Multpurpose Room	None	Matthew Evans MARIO MARTINEZ
No agenda yet
01 Oct 2025, 16:30	break
01 Oct 2025, 16:45	Day 2 Wrap Up and Day 3 Plan	Summary Discussion of Day 2 Plan for Day 3	LSB Auditorium	None
No agenda yet
02 Oct 2025, 08:00	Continental Breakfast		LSB Lobby	None
No agenda yet
02 Oct 2025, 08:30	Day 3, Working Group 1: Materials, Surface Treatments and Outgassing		LExC Classroom	None
No agenda yet
02 Oct 2025, 08:30	Day 3, Working Group 2: Design Fabrication and Assembly	Day 3 will focus on Assembly, and then a recap	LSB Auditorium	None
Start Title Author(s) Topic(s) File(s) Length 08:30 Overview of logistics for installation with focus on dust control (TBD) None None 00:15 08:45 Strategy for leak detection (TBD) None None 00:15 09:00 Welding techniques (automatic vs. manual) (Roxana Mister, CERN) None None 00:15 09:15 Inductive Heating Albert Lazzarini Melina Fuentes-Garcia None None 00:15 09:30 Beam Tube Bake-Out Methods (TBD) None None 00:15 09:45 Group Discussion on Assembly None None 00:30
02 Oct 2025, 08:30	Day 3, Working Group 3: Scattered Light Isolation and Baffles		OSB Multipurpose Room	None
No agenda yet
02 Oct 2025, 10:15	Break		LSB Lobby
02 Oct 2025, 10:30	Day 3 continued, Working Group 1: Materials, Surface Treatments and Outgassing		LExC Classroom	None
No agenda yet
02 Oct 2025, 10:30	Day 3 continued, Working Group 2: Design Fabrication and Assembly	working group recap	LSB Auditorium	None
Start Title Author(s) Topic(s) File(s) Length 10:30 design recap discussion None None 00:45 11:15 fabrication recap discussion None None 00:45 12:00 assembly recap discussion None None 00:30
02 Oct 2025, 10:30	Day 3 continued, Working Group 3: Scattered Light Isolation and Baffles		OSB Multipurpose Room	None
No agenda yet
02 Oct 2025, 12:30	Lunch		LSB Lobby	None
No agenda yet
02 Oct 2025, 13:30	Working Group Reports		LSB Auditorium	None
Start Title Author(s) Topic(s) File(s) Length 13:30 Working Group 1: Materials, Surface Treatments and Outgassing (Paolo Chiggiato and Dan Henkel) None None 00:25 13:55 Working Group 2: Design Fabrication and Assembly (Dennis Coyne and Marco Marrone) Dennis Coyne None None 00:25 14:20 Working Group 3: Scattered Light Isolation and Baffles MARIO MARTINEZ Matthew Evans None None 00:25
02 Oct 2025, 15:00	break		LSB Lobby
02 Oct 2025, 15:15	Workshop Wrap Up and Plan for Next Meeting		LSB Auditorium	None
No agenda yet
02 Oct 2025, 16:30	Adjourn			None
No agenda yet

Other documents for this event