Speaker
Description
The SOLEIL II storage ring upgrade project aims at reducing drastically the horizontal emittance of the electron beam from 4 nm.rad for the present ring down to 80 pm.rad for the SOLEIL II new 4th generation storage ring. It is based on the replacement of the present double bend achromat by a mixed multi bend achromat, the so-called 4BA-7BA lattice [] and a general use of permanent magnets for both dipoles and quadrupoles.
The corresponding long shutdown is scheduled between end of 2028 and end of 2030, when user operation will resume.
Compared to the present storage ring, SOLEIL II will operate with a significant reduced beam lifetime and, consequently, with increased beam loss rates. This leads to many challenges in terms of Radiation Safety and Radiation Damage assessments.
This paper will present the main characteristics of the SOLEIL II storage ring upgrade and the corresponding main challenges in Radiation Safety to maintain the Experimental Hall as a non-radiation area.
A detailed shielding design study is required by the French Nuclear Regulation Authority (ASNR) as a basis of the authorization request that SOLEIL will submit to recover license from ASNR prior to restart the accelerators by the end of 2029.
This paper gives also a status of the shielding design study mainly driven by extensive use of the FLUKA Monte Carlo code [*], the remaining radiation safety challenges to cope with and the foreseen effects of ionizing radiation exposure of the permanent magnets.
Footnotes
- Synchrotron SOLEIL Upgrade – Conceptual Design Report, (2021).
** C. Ahdida et al., New Capabilities of the FLUKA Multi-Purpose Code, Frontiers in Physics 9, 788253 (2022).
*** G. Hugo et al., Latest FLUKA developments, EPJ Nuclear Sciences & Technologies 10 (2024).
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