QED vacuum birefringence workshop

Europe/Berlin
Seminar room 4, Building 1b (DESY Hamburg)

Seminar room 4, Building 1b

DESY Hamburg

Notkestraße 85 22607 Hamburg
Description
Magnetic birefringence of the vacuum due to electron-positron pairs remains to be measured as one of the fundamental tests of QED.
It has been predicted about 80 years ago but not experimentally measured.
To make the QED effect large, a high magnetic length is preferable.

Precision setups like PVLAS (Ferrara), BMV (Toulouse) and OSQAR (CERN) are aiming to measure this fascinating effect. So far a limiting factor is high noise. Experimental progress made in 2015 might be decisive for future efforts.

On the other hand the ALPS-II experiment at DESY is primarily conceived to find axion-like particles. The experiment is currently being set up in a 10m configuration without magnets but we are entering a phase in which more detailed planning of the magnet string is imminent.

In principle, the huge magnetic length of (B^2 L) of ALPS-II of about 2480 T^2m would suggest itself also for a measurement of QED vacuum magnetic birefringence. The technical feasibility of this measurement at DESY is however less clear. Albeit a proposal at FERMILAB 877 aimed to measure this effect with superconducting dipole magnets was put forward but was never performed. 

The idea of this workshop is thus to have a small number of experts in vacuum magnetic birefringence measurements invited with a limited number of contributed talks.
In addition, there will be a public talk (in German) on the 2nd of november by Holger Gies: http://fortbildung.desy.de/e109/e187998/e204744/

If you want to contribute a talk, please get in touch with the main organizers.

The main objective of this workshop will be to discuss results and limitations of the ongoing birefringence measurements in different configurations

and their potential applicability for a potential QED setup at the ALPS-II magnet string.


This workshop is sponsored by PIER https://www.pier-hamburg.de/
and organized by

Main organizers: Babette Döbrich (CERN) and  Jan Pold (DESY) 

Advisory: G. Moortgart-Pick, A.Lindner, A.Ringwald (DESY), R.Schnabel (Univ. Hamburg)


 

Slides
Participants
  • Aaron Spector
  • Amel Shamseldeen Ali Alhassan
  • Andreas Ringwald
  • Axel Lindner
  • Babette Doebrich
  • Benjamin Grabiger
  • Benno Willke
  • Christoph Gödeker
  • Christoph Weinsheimer
  • David d'Enterria
  • Dieter Trines
  • Ejlli Aldo
  • Ernst-Axel Knabbe
  • Federico Della Valle
  • Felix Karbstein
  • Giuseppe Ruoso
  • Gudrid Moortgat-Pick
  • Guido Zavattini
  • Hans-Peter Schlenvoigt
  • Hartmut Grote
  • Holger Gies
  • Ingo Uschmann
  • Jan Hendrik Pold
  • Jan Hošek
  • Jan Mikšík
  • Kai Schulze
  • Marian Dürbeck
  • Matthias Schott
  • Miroslav Sulc
  • Nataliia Kuzkova
  • Noemie Bastidon
  • Petr Jedlicka
  • Robert Lötzsch
  • Roman Schnabel
  • Rémy Battesti
  • Simon Barke
  • Siu Au Lee
  • Stepan Kunc
    • 7:00 PM
      Welcome Drinks DESY Lecture Hall, building 5

      DESY Lecture Hall, building 5

      DESY Hamburg

      For the people arriving on Sunday, some drinks and snacks served are served at the Foyer of the DESY lecture hall

    • 1
      Welcome and logistical information Seminar room 4, Building 1b

      Seminar room 4, Building 1b

      DESY Hamburg

      Notkestraße 85 22607 Hamburg
      Speakers: Babette Döbrich (CERN), Jan Pold (DESY)
      Slides
    • Past and running experiments for VMB Seminar room 4, Building 1b

      Seminar room 4, Building 1b

      DESY Hamburg

      Notkestraße 85 22607 Hamburg
      • 2
        Back View of the Fermilab 877 experiment for a VMB measurement
        Speaker: Siu Au Lee (Colorado Stae University)
        Slides
      • 3
        Results from BMV
        Speaker: Remy Battesti (Universite Paul Sabatier)
        Slides
      • 4
        Results from PVLAS
        Speaker: Frederico Della Valle (Dipartimento di Fisica - Università di Trieste)
        Slides
    • 1:15 PM
      Lunch Seminar room 4, Building 1b

      Seminar room 4, Building 1b

      DESY Hamburg

      Notkestraße 85 22607 Hamburg

      The DESY canteen is building 9

    • Suggested and upcoming VMB measurements Seminar room 4, Building 1b

      Seminar room 4, Building 1b

      DESY Hamburg

      Notkestraße 85 22607 Hamburg
      • 5
        VMB plans at OSQAR
        Speaker: Stepan Kunc (Technical university of Liberec)
        Slides
      • 6
        VMB at Gravitational Wave Detectors
        Speaker: Hartmut Grote (AEI Hannover and LIGO Lab)
        Slides
      • 7
        Light-by-light scattering via photon-photon fusion at the LHC
        Speaker: David D'Enterria (CERN)
        Slides
      • 8
        Feasibility study of detecting vacuum birefringence with X-ray free electron lasers and high-power optical lasers
        Speaker: Hans-Peter Schlenvoigt (Helmholtz-Zentrum Dresden-Rossendorf)
        Slides
      • 9
        High power laser induced vacuum birefringence probed by high purity X-ray polarimetry
        Speakers: Ingo Uschmann (Institut fuer Optik und Quantenelektronik, Universitaet Jena), Kai Schulze (Friedrich Schiller Universitaet Jena)
        Slides
      • 10
        Quantum Reflection in VMB
        Speaker: Felix Karbstein (Universitaet Jena und Helmholtz Institut Jena)
        Slides
    • 11
      Public Talk lecture hall

      lecture hall

      DESY Hamburg

      Notkestraße 85 22607 Hamburg
      Speaker: Holger Gies (University of Jena)
      Slides
    • Conference Dinner DESY canteen

      DESY canteen

      DESY Hamburg

      Notkestraße 85 22607 Hamburg
      • 8:00 PM
        Conference Dinner DESY Bistro (DESY Hamburg)

        DESY Bistro

        DESY Hamburg

        Conference dinner at the DESY Bistro

    • Lessons for optical VMB Seminar room 4, Building 1b

      Seminar room 4, Building 1b

      DESY Hamburg

      Notkestraße 85 22607 Hamburg
      • 12
        Dominating noise sources at PVLAS
        Speaker: Guido Zavattini (University of Ferrara and INFN)
        Slides
      • 13
        Dipole magnet considerations for VMB
        Speaker: Dieter Trines (DESY)
        Slides
      • 14
        Optical coatings: A short process overview
        Speaker: Christoph Goedecker (LaserOptik)
        Slides
      • 15
        Considerations for Integrating QED optics in the ALPS II setup
        Speakers: Axel Lindner, Jan Pold (DESY)
        Slides
    • 12:45 PM
      Lunch Seminar room 4, Building 1b

      Seminar room 4, Building 1b

      DESY Hamburg

      Notkestraße 85 22607 Hamburg
    • 16
      Round Table and short talks Seminar room 4, Building 1b

      Seminar room 4, Building 1b

      DESY Hamburg

      Notkestraße 85 22607 Hamburg
    • 17
      ALPS-II visits Seminar room 4, Building 1b

      Seminar room 4, Building 1b

      DESY Hamburg

      Notkestraße 85 22607 Hamburg
      possibility to visit the ALPS-II lab and the HERA tunnel