16th HL-LHC Collaboration Meeting, Royal Holloway (UK), 14-16 September 2026

14 Sept 2026, 08:00 → 16 Sept 2026, 16:30 Europe/London

At this particularly exciting moment of the project, the HL-LHC Collaboration Meeting will return to the United Kingdom for a second time, thirteen years after the meeting held at Daresbury Laboratory in 2013. This year’s 16th HL-LHC Collaboration Meeting will be hosted by our British partners at Royal Holloway, University of London, and will bring together all members of the collaboration and partner institutions shortly after the start of Long Shutdown 3 (LS3), which marks the beginning of deployment activities for the HL-LHC in the LHC tunnel.  As the project makes this important transition from production and testing to large-scale installation and integration, the meeting will provide a timely opportunity to review progress and discuss upcoming milestones across the accelerator and technical infrastructure domains as well as the interfaces towards the experiments. The meeting will also offer a chance to celebrate the successful completion of several collaboration contributions, with many of their deliverables already installed and successfully operating at nominal conditions in the Inner Triplet String test facility at CERN. These achievements represent vital milestones for the project and demonstrate the successful collaboration between CERN, partner laboratories, and institutes across the HL-LHC community in transforming this challenging project into reality. Following the Collaboration Board with the international partners on Monday morning, the official programme will start on Monday afternoon with plenary sessions, followed by a Welcome drink and a Banquet in the beautiful setting of the Founders Hall at RHUL. Project and work-package status updates and topical discussions on key technical challenges will carry on in parallel sessions over the next two days.  In view of the ongoing LS3, the programme has been condensed into 2.5 days, allowing to close-out this year’s annual meeting on Wednesday mid-afternoon. Participation in the meeting is by invitation only, and registration is mandatory and without fee. Registration deadline: 31st July 2026 Data Privacy Protection Policy : OC no.11 - ATS Events Privacy Notice

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Monday 14 September

08:00 → 09:00 Registration at Royal Holloway, for Collaboration Board members

09:00 → 11:30 Collaboration Board (restricted)

09:00 → 13:00 Registration at Royal Holloway, for Collaboration Meeting participants

11:30 → 13:00 Lunch break

13:00 → 15:30 Plenary session 1 - Monday PM

13:00 Welcome

13:05 Welcome

13:10 HL-LHC Project status

Speaker: Markus Zerlauth (CERN)

13:40 Status of US-AUP contribution

Speaker: Giorgio Apollinari (Fermi National Accelerator Lab. (US))

14:00 Status of D1, DQHDs and HPRRF

Speaker: Tatsushi Nakamoto (KEK)

14:15 Status of D2

Speaker: Stefania Farinon (INFN e Universita Genova (IT))

14:30 Completion of MCBXF production

Speaker: Fernando Toral (CIEMAT - Centro de Investigaciones Energéticas Medioambientales y Tec. (ES))

14:45 Completion of MCBRD magnet production

Speaker: Qingjin Xu

15:00 Status of WP3 with focus on readiness for installation

Speaker: Susana Izquierdo Bermudez (CERN)

15:30 → 16:00 Coffee break

16:00 → 17:40 Plenary session 2 - Monday PM

16:00 IT String status, ROE form cooldown and operation

16:20 Status of WP4

Speaker: Rama Calaga (CERN)

16:40 Status of DQW cryomodules production

17:00 Status of RFD crab cavity production and qualification

17:20 Status of RFD cryomodules production at TRIUMF

Speaker: Robert Laxdal

18:00 → 22:00 Welcome Drink followed by Collaboration Banquet

Tuesday 15 September

08:30 → 11:00 Plenary session 3 - Tuesday AM

08:30 Status of Cold Powering

Speaker: Amalia Ballarino (CERN)

08:50 RHUL contribution to HL-LHC

09:10 Beam Instrumentation for HL era (BGI, Coronagraph, BGC, crab cavity diagnostics …)

09:30 Beam screen production, integration, and preparation for the upcoming laser treatment

Speaker: Cedric Garion (CERN)

09:50 Status of (de-)installation and commissioning activities in the HL-LHC galleries and LHC tunnel

10:10 LS3 baseline schedule and equipment readiness, incoming activities

Speaker: Giulia Papotti (CERN)

10:30 → 11:00 Coffee break

11:00 → 12:45 Tuesday AM - WP2/WP3

11:00 Updates on field quality

Speaker: Georgiana Dima

11:20 Flux jumps and voltage spikes, and their impact on the field

Speaker: Lucio Fiscarelli (CERN)

11:35 Sorting

Speakers: Andrea Fornara (CERN), Massimo Giovannozzi (CERN)

11:50 Field quality at injection

Speaker: Ewen Hamish Maclean (CERN)

12:05 Magnetic field axis

Speaker: Carlo Petrone (CERN)

12:25 FRAS for Run 4

Speaker: Helene Mainaud Durand (CERN)

11:00 → 12:40 Tuesday AM - WP4/AUP/TRIUMF

11:00 DQW cavity production & testing

Speakers: Katarzyna Turaj (CERN), Nuria Valverde Alonso (CERN)

11:20 AUP cavity production & recent NCRs

Speaker: Manuele Narduzzi

11:40 AUP processing & testing

Speaker: Alex Castilla (Lancaster University (GB))

12:00 AUP HOMs status

Speaker: Naeem Abdul Huque

12:20 Dressed cavity testing experience at TRIUMF & preparations for TC0 and TCM1

Speaker: Zhongyuan Yao (TRIUMF)

11:00 → 12:40 Tuesday AM - WP6A/WP15/WP3/Transport

11:00 Cold Powering Systems in the LS3 installation planning : constraints & challenges

Speakers: Giulia Papotti (CERN), Laura Funder

11:20 Cold Powering Systems installation sequence, milestones, QA plan and challenges

Speaker: Yann Leclercq (CERN)

11:40 Lessons learnt from the IT String on the detailed Cold Powering Systems installation sequence

Speaker: Florian Pasdeloup (CERN)

12:00 Cold Powering Systems : interfaces and commissioning

Speaker: Vanessa Gahier (CERN)

12:20 Cold Powering Systems : electrical interfaces and commissioning

Speaker: Samer Yammine (CERN)

12:40 → 14:00 Lunch break

14:00 → 16:00 Tuesday PM - MCF-WP3-WP7-WP12-WP16

14:00 Benchmarking of Circuit and Quench Protection Simulations in the HL-LHC IT String (with an emphasis on RQX)

Speaker: Dimitri Pracht (CERN)

14:20 D1 Magnet Prototype from the Test Bench to the IT String

Speaker: Kento Suzuki (KEK High Energy Accelerator Research Organization (JP))

14:40 Performance of the RCBX and High Order Correctors in the IT String

Speaker: Vincenzo Di Capua (CERN)

15:00 Return of Experience of the CLIQ HWC in the IT String

Speaker: David Carrillo (CERN)

15:20 HL-LHC Energy Extraction System Performance

Speaker: Bozhidar Ivanov Panev (CERN)

15:40 Feedback of the IT String on the HL-LHC HWC Procedures and Software Tools

Speaker: Lucia Herrero Alvarez (CERN)

14:00 → 16:00 Tuesday PM - WP2/WP4/WP5/WP7/WP13/WP14

14:00 HL baseline and validation status

Speaker: Nicolas Mounet (CERN)

14:20 Update on halo models and simulations of halo losses

Speaker: Dora Erzsebet Veres

14:40 Studies of collimation hierarchy breakage with non-linearities for HL

Speaker: Ludovica Bertolozzi (EPFL - Ecole Polytechnique Federale Lausanne (CH))

15:00 Shower studies for injection and extraction protection devices (TCDS and TCLIA)

Speaker: Helene Guerin

15:20 Result of damage experiment with radiation aged coils

Speaker: Delphine Domange (Universite Libre de Bruxelles (BE))

14:00 → 16:00 Tuesday PM - WP4 Cryomodule

14:00 DQW & RFD cryomodules at CERN

Speaker: Teddy Capelli (CERN)

14:20 Cryogenics for crab cavities, design to realization

Speaker: Krzysztof Brodzinski (CERN)

14:40 DQW cryomodules at UK procedures, transport of CM2

Speaker: Edward Jordan (Unknown)

15:00 Cryolines, instrumentation & Outgoing testing

Speaker: Andy Blackett-May (STFC Daresbury Laboratory (GB))

15:20 RFD cryomodules at TRIUMF

Speaker: Oliver Law (TRIUMF)

15:40 Technical Management experience & lessons learned

Speakers: Luke Kristian Bladen (STFC Daresbury Laboratory (GB)), Matthew Williams

16:00 → 16:30 Coffee break

16:30 → 17:30 Steering Committee with AUP (WP4)

16:30 → 17:10 Tuesday PM - MCF-WP3-WP7-WP12-WP16

16:30 QDS Integration/Controls in the IT String in Preparation for HL-LHC

Speaker: Marc-Antoine Galilee (CERN)

16:50 FRAS software status and protection layers

Speaker: Brad Schofield (CERN)

16:30 → 17:20 Tuesday PM - WP2/WP4/WP5/WP7/WP13/WP14

16:30 Update of the availability model for HL-LHC

Speaker: Lukas Felsberger (CERN)

16:45 Crab cavity failure case validation in the SPS

Speaker: Christophe Lannoy (CERN)

17:00 BLM HL-LHC layout and beam loss limits

Speaker: Belen Maria Salvachua Ferrando (CERN)

17:20 → 18:40 Tuesday PM - WP2

17:20 E-cloud updates from HI tests

Speaker: Lotta Mether (CERN)

17:40 Status of flat optics design and D2 coupling correction

Speaker: Kyriacos Skoufaris (CERN)

18:00 Dynamic Aperture of the baseline and alternative scenarios

Speaker: Dr Max Topp-Mugglestone (CERN)

18:20 Status of Dynamic Aperture with updated magnet errors

Speaker: Andrea Fornara (CERN)

17:30 → 18:30 Steering Committee with TRIUMF (WP4)

19:00 → 22:00 Collaboration Board Dinner (restricted)

Wednesday 16 September

08:30 → 10:30 Wednesday AM - WP2/WP5

08:30 High-intensity tests

Speaker: Sofia Kostoglou (CERN)

08:50 Progress on HL collimator impedance and MDs

Speakers: Chiara Antuono (CERN), Nicolas Mounet (CERN)

09:10 New optics baseline and IR7 status

Speaker: Riccardo De Maria (CERN)

09:30 Collimation studies for HL in case we have to disable collimators due to breaking bellows

Speaker: Andre Donadon Servelle (CERN)

09:50 Shower simulation studies for missing collimators

Speaker: Nuno Duarte (CERN)

10:10 Update on IR7 optics, following latest MDs with intensity ramp-up and evolution of TCT losses

Speaker: Bjorn Hans Filip Lindstrom (CERN and Royal Holloway University of London)

08:30 → 10:30 Wednesday AM - WP3-WP6A-WP6B-WP16-WP19

08:30 String Validation Program and HWC of the HL-LHC Magnet Circuits

Speaker: Samer Yammine (CERN)

08:50 Commissioning of the Cryogenic System of the IT String

Speaker: Aleksandra Onufrena (CERN)

09:10 Validation of the HL-LHC Powering Performance in the IT String Converters

Speaker: Vicente Raul Herrero Gonzalez (CERN)

09:30 FRAS Performance in the various operation Phases of the IT String

Speaker: Vincent Thomas Barbarroux (CERN)

09:50 Cold Powering Operation of the IT String

Speaker: Christian Barth (KIT - Karlsruhe Institute of Technology (DE))

10:10 Performance during Powering of the Quench Detection System and Supervision System

Speaker: Jens Steckert (CERN)

08:30 → 10:30 Wednesday AM - WP4 RF Powering

08:30 RF power procurement status & first acceptance tests

Speaker: Amelia Veronica Edwards (CERN)

08:50 HL-LHC LLRF & Controls & Interlocks

Speaker: Gregoire Hagmann (CERN)

09:10 M7 infrastructure & testing

Speaker: Katarzyna Turaj (CERN)

09:30 CM testing at TRIUMF & preparations

Speaker: Zhongyuan Yao (TRIUMF)

09:50 DQW cryomodules at UK RF testing strategy

Speaker: Edward Jordan (Unknown)

10:10 Discussion

10:30 → 11:00 Coffee break

11:00 → 11:40 Wednesday AM - WP2/WP5

11:00 Latest studies of heating of TCLM4 mask

Speaker: Francois-Xavier Nuiry (CERN)

11:20 Status of experimental tests for the transverse stability of the beams

Speaker: Xavier Buffat (CERN)

11:00 → 13:00 Wednesday AM - WP3

11:00 Q2 magnets and cold masses at CERN

Speaker: Julia Mary Haack

11:20 Cryostating at CERN

Speaker: Delio Ramos (CERN)

11:40 Overview on WP3 cold powering test

Speaker: Franco Julio Mangiarotti (CERN)

12:00 Q1/Q3 cold mass, cryostating and test

Speaker: Sandor Feher (Fermi National Accelerator Lab. (US))

12:20 Cryo-assembly installation: from the IT-String to the HL-LHC

Speaker: Lucie Baudin (CERN)

12:40 Status of BPM production and integration

Speaker: Gerhard Schneider (CERN)

11:00 → 12:30 Wednesday AM - WP4 Flash talks

11:00 UK cleanroom QA & improvements

Speaker: Susan Shirling

11:10 DQW Survey + Alignment improvements CM#2

Speaker: Edward Jordan (Unknown)

11:20 Refurbishment of SPS-RFD

Speaker: Alex Verduyn

11:30 Cryomodule QA/QC at CERN

Speaker: Myriam Elena Benahmed

11:40 Material testing

Speaker: Claudia Tatiana Santos Maldonado

11:50 Tuners lessons learned

Speaker: Kurt Artoos (CERN)

12:00 Inventory status at TRIUMF

12:10 Series RFD HOM analysis

Speaker: Subashini De Silva (Old Dominion University (US))

11:40 → 12:40 Wednesday AM - WP2/WP5/WP13

11:40 BGC as a hollow electron beam diagnostic

Speaker: Milaan Patel (University of Liverpool)

12:00 Expected performance of the BPM system

Speaker: Michal Krupa (CERN)

12:20 Emittance measurements for HL-LHC with the BGI

Speaker: James Storey (CERN)

12:30 → 14:00 Lunch break

14:00 → 15:00 Steering Committee with INFN or AUP (WP3)

14:00 → 15:40 Wednesday PM - WP2/WP4

14:00 SPS-RFD MDs & outlook

Speaker: Rama Calaga (CERN)

14:20 Beam-impedance induced heating during the high-intensity tests

Speaker: Chiara Antuono (CERN)

14:40 Operation / RF Multipoles with CCs in SPS

Speakers: Ewen Hamish Maclean (CERN), Guido Sterbini (CERN)

14:50 Longitudinal MDs in LHC 2026 and future outlook

Speaker: Birk Emil Karlsen-Baeck (CERN)

15:10 Longitudinal impedance, HL-LHC update

Speaker: Michela Neroni

15:30 Longitudinal Coupled bunch simulations for HL-LHC

Speaker: Clara Charlotte Becker (Vienna University of Technology (AT))

14:00 → 15:20 Wednesday PM - WP2/WP5/WP13

14:00 Halo monitoring - specifications and status

Speaker: Federico Roncarolo (CERN)

14:20 Crab cavity diagnostics status

Speaker: Giusy Valeria Passarelli (University of London (GB))

14:40 Modelling of Halo dynamics

Speaker: Pascal Hermes (CERN)

15:00 E-O pickup studies

15:30 → 16:00 Coffee break

16:00 → 16:30 Close-out Session

16:00 Close out