We describe a new table-top electrostatic storage ring concept for $30$ keV polarized ions at frozen spin condition. The device will ultimately be capable of measuring magnetic fields with resolution 10$^{-21}$ T sub-mHz bandwidth. With the possibility to store different kinds or ionic molecules and access prepare probe states systems using lasers SQUIDs, it can used search electric dipole mome...

The upgrade of the BESSY II light source in Berlin towards a variable pulse-length storage-ring will lead to complex bunch-filling pattern. This may involve co-existing electron bunches with significant variations their properties. Among many other conditions, it calls for bunch-resolved diagnostics sub-ps time resolution and micrometer spatial resolution. Currently, we are finishing constructi...