Error Field and Correction Coils in DTT: a preliminary analysis

TL;DR

This paper presents a preliminary analysis of error fields in the DTT tokamak, proposing a methodology to model displacements and design correction coils to mitigate these errors.

Contribution

It introduces a simplified model for error field analysis and designs correction coils with calculated ampere-turns to counteract errors in DTT.

Findings

Error fields can be modeled with first order Taylor expansion.

Correction coils can effectively counteract the identified error fields.

Design parameters for correction coils are provided.

Abstract

The Divertor Tokamak Test (DTT) facility, construction starting at Frascati, Italy, is designed to test different solutions for divertor in view of DEMO. A preliminary analysis of the error fields (EFs) assumed a simplified model of rigid and independent displacements and rotations. A methodology based on the first order truncated Taylor expansion has been applied, linking the displacement parameters and the EFs within the required accuracies. A system of in-vessel copper coils has been designed to counteract EFs and the ampere-turns necessary to force them back within the request limits has been calculated. Here, the details of the analysis have been provided.