# The DRESDYN project: planned experiments and present status

## TL;DR

The DRESDYN project develops large-scale liquid sodium experiments to investigate geo- and astrophysical dynamo processes and energy conversion phenomena, with ongoing technical development and multiple experimental setups.

## Contribution

It introduces a comprehensive platform for large-scale sodium experiments, including a precession-driven dynamo and a Tayler-Couette setup, advancing experimental capabilities in this field.

## Key findings

- Design and technical status of the experiments are discussed.
- Experiments aim to study dynamo action and magnetorotational instabilities.
- Additional installations for sodium flow and inspection are outlined.

## Abstract

The Dresden sodium facility for dynamo and thermohydraulic studies (DRESDYN) is a platform for large-scale liquid sodium experiments devoted to fundamental geo- and astrophysical questions as well as to various applied problems related to the conversion and storage of energy. Its most ambitious part is a precession driven dynamo experiment comprising 8 tons of liquid sodium supposed to rotate with up to 10 Hz and to precess with up to 1 Hz. Another large-scale set-up is a Tayler-Couette experiment with a gap width of 0.2 m and a height of 2 m, whose inner cylinder rotates with up to 20 Hz. Equipped with a coil system for the generation of an axial field of up to 120 mT and two different axial currents through the center and the liquid sodium, this experiment aims at studying various versions of the magnetorotational instability and their combinations with the Tayler instability. We discuss the physical background of these two experiments and delineate the present status of their technical realization. Other installations, such as a sodium loop and a test stand for In-Service-Inspection experiments will also be sketched.