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 BTW3 Workshop Overview Slide Michael Zucker Vacuum Cosmic Explorer pdf 00:05 08:45 Remembering Rai Fred Dylla Vacuum Cosmic Explorer Dylla remembrance of Rai Weiss (PDF) 00:05 08:50 Summary of Workshop II at CERN (2023) Fred Dylla Cosmic Explorer Vacuum pdf 00:10 09:00 CE Status Vac Workshop - 2025 Matthew Evans Management CE Status Vac ...pdf 00:30 09:30 Einstein Telescope status + beampipe and vacuum summary Tomasz Bulik Vacuum Cosmic Explorer Talk-ET-status...pdf 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) Michael Zucker Vacuum pdf 00:45 14:15 Beamtube Fabrication and Assembly Tradeoffs Michael Zucker Cosmic Explorer Vacuum pdf 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
Start Title Author(s) Topic(s) File(s) Length 15:45 Thick-walled Carbon Steel Tube Alternative for CEBEX/CE Anna Iudintseva Anna Iudintseva Basic R&D Cosmic Explorer None 00:15
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 Conceptual Design Vacuum Cosmic Explorer G2502099-v1 De...pdf 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
Start Title Author(s) Topic(s) File(s) Length 15:45 None None 00:30 16:15 None None 00:30 16:45 Talk 3 None None 00:30
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 Basic R&D CE_SLC_2025100...key 00:35 09:05 Mechanical/Optical Design Options for Baffles Marc Andres-Carcasona Cosmic Explorer Detector MechanicalDesi...pdf 00:35 09:40 Stray light noise from particulate contamination in ground-based GW interferometers Livia Conti et al. Basic R&D Detector L.Conti - Stra...pdf 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 Vacuum Cosmic Explorer pdf 00:30 11:00 ET Pilot Sector of the ET Vacuum Pipe (Ana Teresa Fontenla, CERN) Melina Fuentes-Garcia et al. Cosmic Explorer Vacuum pdf 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
Start Title Author(s) Topic(s) File(s) Length 13:00 Working Group 1 Schedule, BTW3 (Paolo Chiggiato, CERN) Michael Zucker Vacuum pdf 00:05 13:05 Mild steel v. stainless beamtube: a review of our last five years (D. Henkel) None None 00:20 13:25 Welding novel beamtube materials (A. T. Perez) None None 00:20 13:45 Corrosion requirements and test methods (A.Gervasyev) None None 00:20 14:05 1018 Mild Steel and Characterization of Proposed Black Oxide Coatings (D. Berenger, W&M) Michael Zucker Vacuum pdf 00:15 14:20 Low-Carbon Steel for UHV: Bare vs Magnetite (Aiman Al-Allaq, JLAB) Michael Zucker Cosmic Explorer Vacuum pdf 00:15 14:35 Outgassing measurements for ET (I. Wevers) None None 00:15 14:50 None None 00:15 15:05 None None 00:15
01 Oct 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 Vacuum Tube Design for the Einstein Telescope (Alexandre Lacroix, CNRS LAPP) Dennis Coyne Cosmic Explorer Vacuum Conceptual Design G2502117-v1 CE...pdf 00:15 13:15 ET Vacuum Chamber Considerations (Cedric Garion, Marco Marrone; CERN) Dennis Coyne Cosmic Explorer Vacuum G2502154-v1 ET...pdf 00:15 13:30 Optimized corrugated tube design Alberto Franco-Ordovas Cosmic Explorer Optimized corrugated tube design 00:15 13:45 Beamtube Circumferential Joint Design Dennis Coyne Cosmic Explorer Conceptual Design Vacuum G2502097-v1 ci...pdf 00:15 14:00 Convolution UHV Leak Failure Rate Estimate Dennis Coyne Conceptual Design Vacuum Cosmic Explorer G2502098-v1 Co...pdf 00:15 14:15 Design proposal of tube supports, end caps, and pump port spools for CEBEX/CE Anna Iudintseva System Engineering Cosmic Explorer Assembly Vacuum Conceptual Design Anna Iudintsev...pdf 00:15 14:30 Beam Tube Principal cost factors Dennis Coyne Conceptual Design Vacuum Cosmic Explorer G2502114-v2 be...pdf 00:15 14:45 Group discussion regarding Design None None 00:15 15:00 MACBETH (Fabien Quinten, NIKHEF) Michael Zucker Vacuum Cosmic Explorer PDF 00:15
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
Start Title Author(s) Topic(s) File(s) Length 08:30 Traditional cleaning methods and their infrastructures (L. Ferreira) None None 00:20 08:50 Plasma cleaning (F. Moikenboer) None None 00:20 09:10 Laser cleaning (D. Vlekken) None None 00:20 09:30 Is coating the inner wall to avoid outgassing still an option? (C. Scarcia) None None 00:15 09:45 None None 00:15 10:00 Effects of cleaning methods on microscopic roughness of surfaces (D. Henkel) None None 00:15
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 Leak detection of the ET Pilot Sector beam tubes Dennis Coyne Cosmic Explorer Vacuum None 00:10 08:40 Welding Techniques (Roxane Misler, CERN) Dennis Coyne Vacuum Cosmic Explorer G2502116-v1 We...pdf 00:15 08:55 Weld design to join chambers mechanical tolerances, Dust contamination: Manufacturing and welding options (Roxane Misler, CERN) Dennis Coyne Vacuum Cosmic Explorer Installation G2502115-v1 We...pdf 00:15 09:10 Alternative Method for Large Vacuum Systems Bakeout (Freek Molkenboar, TNO) Michael Zucker Cosmic Explorer PDF 00:15 09:25 Thermal insulation for GWDs beam pipe vacuum systems (Carlo Scarcia, Karl Owens; CERN) Dennis Coyne Cosmic Explorer Vacuum G2502127-v1 In...pdf 00:30 09:55 Group Discussion on Assembly None None 00:15 10:10 Opportunities/concepts for automation to increase rate and/or lower costs (TBD) 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 Overview of Potential Manufacturing Techniques for Corrugated Beamtube (Peter van der Heijden, VDI) Dennis Coyne Vacuum Cosmic Explorer G2502139-v2 Ov...pdf 00:15 10:45 Induction Bakeout Experiment at LIGO Caltech (Melina Fuentes-Garcia, LIGO) Melina Fuentes-Garcia et al. Cosmic Explorer Vacuum G2502145-v1 (pdf) 00:15 11:00 design recap discussion None None 00:15 11:15 fabrication recap discussion None None 00:15 11:30 assembly recap discussion None None 00:15 11:45 QA/QC on welds, cleanliness, and leak-tightness after fabrication (TBD) None None 00:15 12:00 Group Discussion regarding Fabrication None None 00:15
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) Dan Henkel Vacuum Cosmic Explorer WG 1 Close Out.pdf 00:25 13:55 WG2 (Design, Fabrication, Assembly) Summary Dennis Coyne Cosmic Explorer Vacuum G2502173-v1 BT...pdf 00:25 14:20 BTW3 WG3 Summary Matthew Evans Detector BTW3 WG3 Stray...pdf 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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