2015-03-27: New FLAIR management has been elected

The BASE collaboration, led by Dr Stefan Ulmer who is part of the AVA network, just published an article in Nature Communications. The collaboration reports the most precise measurement of the antiproton magnetic moment with a fractional precision of 0.8 parts per million. The result improves upon the last measurement by the ATRAP collaboration by a factor of 6.


The FLAIR collaboration has just released the first edition of the MIRROR

MIRROR Issue 1 July 2015

Planned as a quarterly newsletter for everyone interested in the physics with low energy antiprotons the MIRROR shall serve as a new communication platform with latest news, R&D results and information about upcoming events.
In order to receive a copy, simply send an email to carsten.welsch@cockcroft.ac.uk

A paper that has just been published in Nuclear Instruments and Methods in Physics A will help scientists provide higher quality antiproton beams to experiments at CERN and antimatter facilities across the world.

 “Non-Gaussian beam dynamics in low energy antiproton storage rings” by J. Resta-López, et. Al presents simulation studies undertaken to investigate the effects of beam heating phenomena present in antimatter decelerators.

Read more...​

2016-03-18: 2016 - A LEAP Year

2015-11-25: International Workshop on Antiproton Physics and Technology at FAIR 

2016-09-09: Antimatter research boosted by almost 4 M€ funding from the EU

The project AVA (Accelerators Validating Antimatter physics) has just been selected for funding. It comprises a lot of the European expertise in antimatter research and joins no less than 5 universities, 8 national and international research centres, as well as 13 partners from industry at project start.
Within AVA, the project partners will pursue a closely connected R&D program across three scientific work packages. The first one focuses on facility design and optimization, addressing beam life time and stability issues in lowest energy storage rings, as well as beam cooling, deceleration and extraction processes.

A total of 15 Fellows will be recruited and all will carry out their respective research project, as well as follow a structured combination of local and network-wide trainings. This will include hands-on training on accelerator facilities, as well as international Schools, Topical Workshops and Conferences that will all be organized by the AVA consortium.


The proceedings of the 11th International Conference on Low Energy Antiproton Physics (LEAP 2013) held in Uppsala, Sweden, 10-15 June, 2013 have been published in Hyperfine Interactions.

LEAP is an interdisciplinary forum centered around the antimatter partner of the proton. The field of antiproton physics has seen recent breakthroughs and the start up of the Facility for Antiproton and Ion Research (FAIR) at Darmstadt will mark the beginning of a new era for the antiproton physics with promises of far-reaching insights into structure of matter and the evolution of the Universe.

FLAIR is part of the experimental program at FAIR. At FLAIR slow antiprotons will be investigated. The FLAIR facility will make use of a magnetic Low energy Storage Ring (LSR, the modified former Swedish CRYRING) and an electrostatic Ultra-low energy Storage Ring (USR). At LEAP 2013, their features and planned application at FLAIR have been discussed. Furthermore, the double-Penning trap technique, which allowed the first direct observation of single spin flips of a single proton, and the status of the planned Baryon Antibaryon Symmetry Experiment (BASE) at the antiproton decelerator of CERN have been presented.

Further information:
LEAP 2013 Website
LEAP 2013 Conference Proceedings Part I and Part II

(FAIR-15) November 16th - 19th  2015, Budker Institute of Nuclear Physics, Novosibirsk, Russia

The Budker Institute of Nuclear Physics (BINP) in Novosibirsk hosted an international workshop on antiproton physics and modern technology in accelerator and detector physics for the FAIR facility from 16th to 19th of November, 2015. The event has gathered around 60 physicist and students from around the globe including Russia, Germany, Japan, Italy and Switzerland to discuss the current status of the FAIR project, issues, challenges and work plans for the coming years, as well as to exchange experiences in the relevant fields.

The workshop talks covered topics such as the PANDA detector and its physics program with high-energy antiprotons, as well as presentations about antiproton and ion beam production, acceleration and cooling. Dr Wolfgang Quint from GSI contributed a talk about the FLAIR physics program and current status of work at HITRAP and CRYRING@ESR.

The workshop was well-attended, in particular by many young physicists who got the chance to learn from their more experienced colleagues and pave the way for the future researcher careers. 
All talk can be found via the workshop home:
http://fair15.inp.nsk.su and additional photos can be accessed via this link:

BINP is one of the key participants of the FAIR project. It is responsible for the full development of the Collector Ring (CR): This includes the project coordination and operation of the ring in different modes of operation. The primary purpose of the CR is to capture and cool secondary particle beams and further distribution them to other accelerators and experiments. Moreover, BINP participates in the manufacture of beam transport channels, as well as of important parts of the PANDA detector, including the forward RICH and dipole, as well as the target spectrometer solenoid.

2014-10-27: Conference Proceedings of LEAP 2013 published

Current FLAIR steering committee member Carsten P. Welsch has recently been elected as the new spokesperson of the FLAIR collaboration. On April 1, 2015 he will follow Klaus Blaum, Max Planck Institute for Nuclear Physics, Heidelberg, who holds this position since May 2012.
Carsten P. Welsch is project leader of the ultra-low energy storage ring (USR) project. He is a Full Professor at the University of Liverpool and head of the Accelerator Physics Group, based at the Cockcroft Institute of Accelerator Science and Technology.
Thomas Stöhlker, GSI Darmstadt, has been re-elected as FLAIR co-spokesperson, and Jochen Walz, Johannes Gutenberg University Mainz, will replace Eberhard Widmann, SMI, Vienna, as second co-spokesperson.
The FLAIR collaboration cordially thanks the outgoing management members for their successful work in the past three years.

2015-07-31: Interested in the latest news from the Anti-world? 

2014-08-04: Novel double Penning-trap technique allows most precise direct measurement of the magnetic moment of a single proton

2014-03-21: News from CRYRING@ESR

Experts from around the world discussed the latest findings in antiproton physics and related fields. They discussed future experiments and how to take maximum benefit from the improved beam quality that new facilities will provide.

The scientific program consisted of invited and contributed talks which allowed research leaders to present their latest findings. Poster sessions in the evenings of the first two days allowed for further discussion.

An excursion to Shirakawa-go which was declared a World Heritage Site by UNESCO in 1995 completed an exciting week. All participants enjoyed the stimulating environment the LEAP provided and are looking forward to the next edition which will take the community to Paris, France in 2018.

The Facility for Antiproton and Ion Research (FAIR) will open up unprecedented research opportunities in hadron and nuclear physics, atomic physics and nuclear astrophysics, as well as in applied sciences including materials research, plasma physics and radiation biophysics with applications towards novel medical treatments and space science. The facility drives an international R&D program into accelerator science, new detector technologies and advanced beam instrumentation for superior beam monitoring capabilities.


Low energy antiprotons as a probe for nuclear structure remains unexploited despite past pioneer works at Brookhaven and CERN. 
The advent of new facilities, namely the ELENA low energy antiproton ring at CERN and the European Facility of Antiproton and Ion Research (FAIR) in Germany open a wide range of perspectives.
Nuclear structure studies with antiprotons require microscopic potentials and approaches to describe the interaction of low energy antiprotons with nuclei. The formation and decay processes of antiprotonic atoms is important to address the sensitivity of antiprotons to the nuclear density radial distribution. 
In this workshop, past work with low energy antiprotons for nuclear physics will be reviewed in a critical way. New perspectives opened by the recent developments in the theory of nuclear interactions and in the treatment of the nuclear many-body problem, as well as the new facilities ELENA at CERN and FAIR will be discussed.

Main Topics

  • physics with antiprotons
  • antiprotonic atoms and nuclear structure
  • antiproton-nucleon and antiproton-nucleus potentials
  • antinucleon-nucleon annihilation mechanism and cross sections
  • New facilities and projects

2019-02-04: New paper published on physics opportunities at FAIR

2019-03-15: Workshop on antiproton-nucleus interactions and related phenomena

What was supposed to be a global beehive of nuclear physics is, for now, still a large, muddy field outside the German city of Darmstadt. The Facility for Antiproton and Ion Research (FAIR), an extension of the GSI Helmholtz Centre for Heavy Ion Research planned by a collaboration of eight European Union countries plus Russia and India, was first expected to open in 2009, and then in 2015. But a series of planning errors and other problems pushed the price tag up to some €1.7 billion—an overall rise of about 75%—and stalled construction...read more

Since 1990 the LEAP (Low Energy Antiproton Physics) conference is held every two or three years to discuss the latest findings and exchange information about research with low energy antiprotons.

There has been some remarkable progress recently in experiments with low energy antiproton physics and new facilities such as the Extra Low Energy Antiproton Ring (ELENA) or the Facility for Low energy Antiproton and Ion Research (FLAIR) will offer even more exciting prospects for hitherto impossible experiments.

Between 6th – 11th March 2016 the antimatter research community met in the beautiful town of Kanazawa, Japan.

2014-08-27: IUPAP Young Scientist Prize awarded to Stefan Ulmer

2016-09-27: A Cool Investigation into Antiproton Beam Dynamics

Every particle is produced with its corresponding antiparticle and such particle-antiparticle pairs annihilate each other. However, the observable universe shows no matter-antimatter symmetry but is matter-dominated. To explain this matter-antimatter imbalance scientists assume that at the origin of the universe matter particles outnumbered antimatter particles. Therefore, all antimatter particles were destroyed, leaving behind only matter.

The measurement of minutest differences between the magnetic moment μp of a proton and its corresponding antiparticle, the antiproton, provides a precise test of the particle-antiparticle equality in the baryonic sector and thus of the CPT symmetry of the Standard Model. This could help to explain the matter-antimatter imbalance of our universe. The to date most precise value of μp has been obtained indirectly in 1972 by analysing the spectrum of an atomic hydrogen maser in a magnetic field.
A collaboration of researchers now succeeded to improve the 42-year-old value of the magnetic moment of the proton. The new value is 3 times more precise than the result of the indirect method and about 760 times more precise than other former direct single proton Penning-trap measurements.
Scientists from the Johannes Gutenberg University Mainz, the Helmholtz Institute Mainz, the Max Planck Institute for Nuclear Physics in Heidelberg, the GSI Darmstadt, the Ulmer Initiative Research Unit at RIKEN in Japan and the Ruprecht Karls University Heidelberg were involved in this project.

FLAIR member A. Mooser et al. report in the journal "Nature" on the improved direct measurements of the magnetic moment of a single proton at the University of Mainz, Germany. Direct Penning trap measurements are generally based on the measurement of the frequency ratio of the Larmor frequency (νL) and the cyclotron frequency (νc). At Mainz a novel double Penning-trap setup has been developed in order to reduce the broadening of the Larmor resonance which limited the experimental precision in former direct measurements with Penning traps. The double Penning-trap consists of two separate Penning traps, an analysis trap and a precision trap, which are connected by transport electrodes. The spin-state detection is carried out in the analysis trap with a superimposed strong magnetic bottle. The measurement of the cyclotron frequency and the excitation of spin-flips at the Larmor frequency are performed in the precision trap, in which the magnetic field is more homogeneous by orders of magnitude. This narrows the width of the Larmor resonance dramatically, and thus this double Penning-trap method significantly improves the precision and allowed the improvement of the 42-year-old value of the magnetic moment of the proton by a factor of 3.

A high-precision measurement of the antiproton magnetic moment using the novel double Penning-trap method is planned by FLAIR member Stefan Ulmer and his team. It will be conducted at the BASE experiment at the Antiproton Decelerator of CERN, Geneva. The comparison of the precise values of the magnetic moments of the proton and the antiproton will provide a sensitive test of CPT invariance with baryons.

Please read more in the "Nature" Letter and the "Nature" News.

Read also the press releases of the institutes:

University of Mainz
Max Planck Institute for Nuclear Physics in Heidelberg
GSI Darmstadt
RIKEN Institute, Wako, Japan

18.03.16: 2016 - A LEAP Year

FLAIR member Dr. Stefan Ulmer from the RIKEN Ulmer Initiative Research Unit has been selected to receive the IUPAP Young Scientist Prize 2014 in Fundamental Metrology. With this prize the International Union of Pure and Applied Physics (IUPAP) honors his work on proton and antiproton magnetic moment measurements. The measurement of the antiproton magnetic moment will be conducted at the BASE experiment at the Antiproton Decelerator of CERN, Geneva. A comparison of both values will provide a sensitive test of CPT invariance with baryons and contributes to the investigation of the matter-antimatter imbalance of the observable universe.

The award ceremony took place on 25 August 2014 at the CPEM 2014, the 29th Conference on Precision Electromagnetic Measurements in Rio de Janeiro, Brazil, which is devoted to topics related to electromagnetic measurements at the highest accuracy levels. 
We cordially congratulate Stefan Ulmer on receiving this distinction of his scientific work.

2017-01-20: Antiproton magnetic moment measured with six-fold improved precision

2016-07-18: Long-delayed nuclear center looks set for construction

In the spring of 2013 the Swedish CRYRING has been transfered from the Manne-Siegbahn-Laboratory in Stockholm to the future FAIR accelerator facility at GSI. During the past months the former FOPI cave in the GSI experimental area has been remodelled to house the ion storage ring. The necessary concrete work is now completed. Before the ion storage ring can be mounted the electric installations and other infrastructure features have to be completed.

CRYRING has a diameter of 18 meters and will initially be assembled in cooperation with GSI for experiments and machine tests at the existing GSI accelerator facility. Among other things the control system for FAIR can be tested with CRYRING. Regarding FLAIR it is planned to use CRYRING as the Low-energy Storage Ring (LSR) for research in atomic physics with slow antiprotons.

Please read more in the press release of GSI Darmstadt.