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
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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 Vacuum Cosmic Explorer 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
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30 Sep 2025, 12:30	Lunch		LSB Lobby	None	Eadie Balint
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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 Beamtube Fabrication and Assembly Tradeoffs Michael Zucker Cosmic Explorer Conceptual Design Observatory Facilities System Test Basic R&D Vacuum 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
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30 Sep 2025, 15:45	Day 1, Working Group 1 Breakout: Materials, Surface Treatments and Outgassing		LExC Classroom	None
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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 Vacuum Conceptual Design Cosmic Explorer G2502099-v1 De...pdf 00:15 16:00 Vacuum Tube Design for the Einstein Telescope (Alexandre Lacroix, CNRS LAPP) Dennis Coyne Vacuum Conceptual Design Cosmic Explorer G2502117-v1 CE...pdf 00:15 16:15 Beam Tube Principal cost factors Dennis Coyne Vacuum Conceptual Design Cosmic Explorer G2502114-v1 be...pdf 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
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30 Sep 2025, 18:30	Group Dinner		Tagaris Winery	None
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01 Oct 2025, 08:00	Continental Breakfast		LSB Lobby	None
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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 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- The Cosmic Explorer Beamtube Experiment Michael Zucker Basic R&D Vacuum Cosmic Explorer System Test Observatory Facilities Conceptual Design None 00:30 11:00 ET Pilot Sector of the ET Vacuum Pipe (Ana Teresa Fontenla, CERN) None None 00:30 11:30 Vacuum Tube Design for the ET Pilot Sector (Alexandre Lacroix, CNRS LAPP) Michael Zucker Cosmic Explorer Vacuum PDF 00:30
01 Oct 2025, 12:00	Lunch		LSB Lobby	None
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01 Oct 2025, 13:00	Day 2, Working Group 1 Breakout: Materials, Surface Treatments and Outgassing		LExC Classroom	None
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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 Beamtube Circumferential Joint Design Dennis Coyne Vacuum Conceptual Design Cosmic Explorer G2502097-v1 ci...pdf 00:15 13:15 Convolution UHV Leak Failure Rate Estimate Dennis Coyne Cosmic Explorer Conceptual Design Vacuum G2502098-v1 Co...pdf 00:15 13:30 Design proposal of tube supports, end caps, and pump port spools for CEBEX/CE Anna Iudintseva Assembly Vacuum Cosmic Explorer Conceptual Design System Engineering Anna Iudintsev...pdf 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 (Fabien Quinten, NIKHEF) Michael Zucker Vacuum Cosmic Explorer PDF 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
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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
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02 Oct 2025, 08:00	Continental Breakfast		LSB Lobby	None
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02 Oct 2025, 08:30	Day 3, Working Group 1: Materials, Surface Treatments and Outgassing		LExC Classroom	None
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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 00:10 08:40 Strategy for leak detection (TBD) None None 00:10 08:50 Welding Techniques (Roxane Misler, CERN) Dennis Coyne Vacuum Cosmic Explorer G2502116-v1 We...pdf 00:15 09:05 Weld design to join chambers mechanical tolerances, Dust contamination: Manufacturing and welding options (Roxane Misler, CERN) Dennis Coyne Cosmic Explorer Installation Vacuum G2502115-v1 We...pdf 00:15 09:20 Inductive Heating Albert Lazzarini Melina Fuentes-Garcia None None 00:15 09:35 Alternative Method for Large Vacuum Systems Bakeout (Freek Molkenboar, TNO) Michael Zucker Cosmic Explorer PDF 00:15 09:50 Thermal insulation for GWDs beam pipe vacuum systems (Carlo Scarcia, Karl Owens; CERN) Dennis Coyne Vacuum Cosmic Explorer G2502127-v1 In...pdf 00:30 10:20 Group Discussion on Assembly None None 00:15
02 Oct 2025, 08:30	Day 3, Working Group 3: Scattered Light Isolation and Baffles		OSB Multipurpose Room	None
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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
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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
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02 Oct 2025, 12:30	Lunch		LSB Lobby	None
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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
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02 Oct 2025, 16:30	Adjourn			None
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