1. Introduction to Experimental Site Axion Research @ Mainz

2. Potential Experimental Sites of IAXO
Positive SPSC recommendation puts some commitment to CERN to act as host institution
However, wish from CERN to also look for alternative sites / funding for the magnet system
Alternative site has to have the required cryogenic, engineering infrastructure
DESY
Mainz
INFN Frascati
???

3. Mainz Involvement in ALPS / WISP Searches
AG Budker: Cosmic Axion Spin Precession Experiment (ERC Advanced Grant)
CASPEr: ultrasensitive NMR experiment
GNOME: Global Network of Optical Magnetometers for Exotic physics searches
Dilaton Searches via Atomic Clocks
AG Denig
Search for Hidden Photons at MESA/MAMI
AG Heil
search for a spin-dependent P- and T-violating nucleon-nucleon interaction mediated by light pseudoscalar bosons
AG Wurm: Borexino, (Juno)
AG Schott: OSQAR, ALPS-II

4. Accelerators at Mainz (1/2)
MAMI Hallmarks
Electron and Photon Beam Emax = 1.6 GeV
Intensity max. 140 μA
Resolution σE < MeV
Polarization 85%
Low-Energy Electron Accelerator with high intensity suited for Dark Photon search
at time of publication most stringent limit ruling out major part of the parameter range motivated by (g-2)μ

5. Accelerators at Mainz (2/2)
Mainz Energy-Recovering Superconducting Accelerator
Recirculating ERL Emax = 155 MeV
Imax > 1 mA (ERL)
commissioning 2020
WISP related physics program
Dark sector searches with MAGIX
Beam Dump Experiment MESA

6. Potential Sites at Mainz

7. (Axion Related) Infrastructure at Mainz
Infrastructure and expertise in the operation of large scientific instruments
Mechanics, engineering
Helmholtz Institute Mainz (HIM): Cooperation between Uni. Mainz, Helmholtz-Association, GSI Darmstadt
Liquid helium infrastructure/cryo-expertise and supply for (large) superconducting magnets
Possibility to operate MESA/MAMI and magnet facilities in sequence / in parallel
Moderate space next-to / close-by the accelerator complex

8. Possible Future Axion Research Activities
Continue and intensify our axion research efforts in the future
One possible option under discussion: Integrate a platform to the existing infrastructure, which allows to operate large magnets / provide large magnetic fields for axion related research
Operation of smaller-scale (existing) magnets: relic axion searches, VMB, …
Platform would allow for operation of large-scale magnets designed specifically for axion searches