6th Slow Extraction Workshop (SX 2025)

6 Oct 2025, 08:00 → 9 Oct 2025, 17:00 US/Eastern

Stony Brook Wang Center

Kevin Brown (C-AD)

Motivation

The 6th Slow Extraction Workshop (SX 2025), hosted by Brookhaven National Laboratory, will be held at the Stony Brook University Wang Center from October 6-9, 2025. The SX 2025 Workshop will address topical issues associated with Slow Extraction, as well as provide a forum for experts to share research and experiences in this specialized accelerator subfield.

In July 2016, GSI hosted the first in a new series of workshops aimed at the issues, technologies, innovations, and theory of slowly extracting beams from particle accelerators. They assembled experts from around the world and ran a successful and meaningful meeting, summarized on this site.   A workshop on slow extraction had not taken place prior to this since 2002 and 2005 when two ICFA mini workshops covered related topics. Our punishment for their success was a continuation of the workshop as a series, hosted by CERN in 2017, Fermilab in 2019, KEK/JPARC in 2022, and most recently by Wiener Neustadt in 2024.

Poster Contributions: 

Poster presentations will be accepted at this workshop. This is an excellent opportunity to present recent results not discussed in detail by the talks. It is also an opportunity for facilities to highlight capabilities and special features. Posters presented at previous conferences are accepted.

Registration

2025-10-09-3719-2.jpg

2025-10-09-3719-3-edited.jpg

Session Chairs.pdf

SX2025 Poster

Synoptic Table.pdf

Monday 6 October

08:00 → 09:00 Breakfast

09:00 → 09:30 Welcome and Workshop Introduction: Wolfram Fischer & Kevin Brown

09:30 → 10:00 Status of the SX commissioning for the Mu2e experiment

Speaker: Vladimir Nagaslaev (Fermilab)

Fermi_SX_2025.pptx

10:00 → 10:30 Posters Setup

10:30 → 11:00 HEARTS@LEIR for R2E testing at CERN

Speaker: Cristopher Cortes (CERN)

HEARTSCortesSXW25.pptx

11:00 → 11:30 Slow extraction of mixed ion beams

Speakers: David Ondreka (GSI Helmholtzzentrum für Schwerionenforschung), Elisabeth Renner (TU Wien)

SX2025_MixedBeams_Renner.pdf

SX2025_MixedBeams_Renner.pptx

11:30 → 12:00 Less ripple - higher intensity: What is the "ideal" intensity in SX for raster-scanning at HIT?

Speaker: Christian Schömers (HIT)

Schoemers HIT SX2025 public.pptx

12:00 → 13:00 No Host Lunch

13:00 → 13:30 Slow extraction simulations with SciBmad

Speaker: Eiad Hamwi (Cornell University)

Hamwi-SX_2025.pptx

13:30 → 14:00 Simulating the space radiation environment with accelerators

Speaker: Kevin Brown (C-AD)

HEET-KBrown-10062025.pptx

14:00 → 14:30 Stable islands and bent crystals for slow extraction

Speaker: Massimo Giovannozzi (CERN)

SXW2025-MG.pptx

14:30 → 15:00 Discussion

15:00 → 15:30 Posters with Coffee

15:30 → 16:00 Octupole assited slow extraction from SPS to the North Area at CERN

Speaker: Aleksandr Gorn (CERN)

2025-10-06 SX workshop_final.pptx

16:00 → 16:30 Crystals and beam diffusers for higher extraction efficiency at J-PARC

Speaker: Ryotaro Muto (KEK)

20251006_RM_Crystal.pdf

16:30 → 17:00 Development of SX schemes for SIS100 in the presence of higher-order field errors

Speaker: David Ondreka (GSI Helmholtzzentrum für Schwerionenforschung)

SX-WS6_Ondreka_SIS100-SX-Field-Errors_v4.pdf

SX-WS6_Ondreka_SIS100-SX-Field-Errors_v4.pptx

17:00 → 17:30 SPS Crystal shadowing advancment and operational deployment

Speaker: Francesco Maria Velotti (CERN)

Non-local shadowing towards operational deployment

Tuesday 7 October

09:00 → 09:30 Studies on collective phenomena related to slow beam extraction

Speaker: Masahito Tomizawa (J-PARC)

SXWS2025_Tomizawa_v2.pdf

SXWS2025_Tomizawa_v2.pptx

09:30 → 10:00 Design of a resonant slow extraction from low-emittance electron booster rings using transverse resonance island buckets

Speaker: Cristopher Cortes (CERN)

DESY4SX-2025-10-07.pptx

10:00 → 11:00 Posters with Coffee

11:00 → 11:30 Investigations into multi energy extraction at MedAustron

MedAustron, located in Wiener Neustadt, Austria, is a synchrotron facility used for medical treatment and research. To decrease downtime and increase the efficiency of the machine, multi energy extraction (MEE) techniques are explored. An alternative extraction method to the present betatron core driven extraction is radio frequency knock out (RFKO). This method allows for extracting bunched beams, thus enabling re-acceleration or deceleration without recapturing the particles after partial extraction. This contribution presents MEE studies using the RFKO extraction method through measurements and simulations with Xsuite, exploring energy changes in both upwards and downwards mode. Of particular interest are the effects of the energy change on the longitudinal phase space distribution and the resulting spill behavior. The influence of main dipole ramp rates and RF parameters, such as voltage, on the longitudinal phase space distribution is characterized through longitudinal tomography.

Speaker: Katrin Holzfeind

MEE_TU_MedAustron.pptx

11:30 → 12:00 Status of RF knock-out extraction development at MedAustron

Speaker: Fabien Plassard (MedAustron)

SlowEx2025_RFKO_dev_at_MedAustron_FPL2.pptx

12:00 → 13:00 No Host Lunch

13:00 → 13:30 Crystal production at CERN

Speaker: Luigi Esposito (CERN)

2025-10-07_crystal_production_at_CERN_SloEx_BNL.pdf

13:30 → 14:00 R&D on low-Z electrostatic septa at CERN

Speaker: Friedrich Lackner (CERN)

6th slow extraction workshop low Z development FL.pptx

14:00 → 14:30 Realization of extreme sensitive power-supplier AC ripple measurements

Speaker: Frank Stulle (Bergoz)

High Resolution Power Supply Ripple Measurements v003.pdf

High Resolution Power Supply Ripple Measurements v003.pptx

14:30 → 15:00 Discussion

15:00 → 15:30 Posters with Coffee

15:30 → 16:00 Crystal extraction studies at SPS

Speaker: Yann Dutheil (BNL)

2025_10_SlowEx_Crystal_project.pptx

16:00 → 16:30 RF techniques for spill quality control at CERN

Speaker: Pablo Arrutia (CERN)

RF techniques for spill ripple improvement

17:30 → 20:00 No Host Dinner

Wednesday 8 October

09:00 → 09:30 Studies of bunched beam extraction with high harmonics h=90 at SIS18

Speaker: Peter Forck (Beam Instrumentation and advanced operation)

Bunched_Beams_Forck_SXworkshop_20251008.pdf

Bunched_Beams_Forck_SXworkshop_20251008.pptx

09:30 → 10:00 Tailored multi-band excitation to minimize fluctuations for knock-out extraction

Speaker: Philipp Niedermayer (GSI)

Niedermayer - RFKO Excitation.pdf

10:00 → 11:00 Posters with Coffee

11:00 → 11:30 Studies on spill quality improvement at J-PARC

Speaker: Ryotaro Muto (KEK)

20251008_RM_Spill.pdf

11:30 → 12:00 Spill feedback and optimisation system for RFKO and tune scan extraction

Speaker: Philipp Niedermeyer

Niedermayer - Spill Optimization System.pdf

12:00 → 13:00 No Host Lunch

13:00 → 13:30 Extraction bump digital twin for NSRL slow extraction

Speaker: Lucy Lin (Brookhaven National Laboratory)

SX2025_BumpDT.pdf

SX2025_BumpDT.pptx

13:30 → 14:00 Crystal design based on multi-fidelity surrogate models

Speaker: Francesco Maria Velotti (CERN)

MVRA crystal design via multi fidelity Bayesian optimization

14:00 → 14:30 Operational results with new high frequency spill monitor and prospects

Speaker: Federico Roncarolo

2025-10-08_FastSpillMon_FR@SX-BNL.pdf

14:30 → 15:00 Discussion

15:00 → 15:30 Posters with Coffee

15:30 → 16:00 Precise evaluation of time-varying quadrupole field errors in the J-PARC Main Ring

Speaker: Takashi Asami (KEK)

TakashiAsami_SXWS2025.pdf

16:00 → 16:30 Development of the bent crystals for Slow Extraction

Speaker: Vincenzo Guidi (University of Ferrara)

Presentation Guidi SX25 2025-10-08.pdf

16:30 → 17:00 Poincare-friendly tracking with tune modulation

Speaker: Stephen Peggs (BNL)

movie_2_bucket_NLC.mp4

peggs_SX2025_251008.pdf

Thursday 9 October

08:30 → 09:00 Session 1 and 2 Summary

Speakers: Christian Schömers (HIT), Eiad Hamwi (Cornell University), Francesco Maria Velotti (CERN), Kevin Brown (C-AD), Lucy Lin (Brookhaven National Laboratory), Masahito Tomizawa (J-PARC), Vladimir Nagaslaev (Fermilab), Yann Dutheil (BNL)

Session 1&2 Summary

08:30 → 09:00 Summary: Facilities and Applications & New Methods Higher Methods for Higher Efficiency

09:00 → 09:30 Session 3 and 4 summary

Speakers: Alessio Mereghetti, David Ondreka (GSI Helmholtzzentrum für Schwerionenforschung), Elisabeth Renner (TU Wien), Kiel Hock (Brookhaven National Laboratory), Matthew Fraser (CERN), Pablo Arrutia (CERN)

Session 3 summary

SpillRipple_BeamQuality_Summary3.pdf

Summary Document

09:00 → 09:30 Summary: Slow Extraction Hardware and Machine Protection & Spill Ripples & Beam Quality

09:30 → 10:00 Session 5 and 6 summary

Speakers: Aakaash Narayanan (aakaashn@fnal.gov), Cristopher Cortes (CERN), Peter Forck (Beam Instrumentation and advanced operation), Ryotaro Muto (KEK)

Session_impression_AN_PF.pptx

Summary_Wed-Afternoon-1_Session.pdf

09:30 → 10:00 Summary: Optimisation and Machine Learning for Slow Extraction & Advances in Instrumentation

10:00 → 10:30 Next Workshop Presentation

10:00 → 10:30 SX2027_Announcement

Speaker: Matthew Fraser (CERN)

SXWS27_CERN.pptx

10:30 → 11:00 Close-out

11:00 → 12:30 No Host Lunch

12:30 → 17:00 Tour at BNL