Since 2011 KEK has participated in the design study of the High Luminosity LHC (HL-LHC) upgrade within the framework of the CERN-KEK collaboration and has been conducting the design study of the new beam separation dipole magnet, D1, including the development of 2-m long model magnets. Main design requirements for the new D1 are the large coil aperture of 150 mm and the field integral of 35T·m. Other important design parameters associated with higher radiation are the total heat load of 135 W, the local peak heat load of 2 mW/cm3 and the total dose of 25 MGy in lifetime. Following the detailed design study in several years, the fabrication of a 2-m long model magnet was started in 2015. The 1st model magnet was completed in March 2016 and the cold test has been performed so far.
Based on the outcome through the design study and the 1st model magnet development, the following questions will be discussed in this HL-LHC D1 Magnet Review.
1. Can we keep the current baseline design for the next 2m long model magnets or the 7m long prototypes?
2. Based on the cold test results of the 1st model, how can we improve the quench performance of the 2nd model?
3. Do we sufficiently understand the field quality of the magnet?
4. Should we re-assemble the 1st model with enhancing the coil preload to prove the better quench performance?
5. Is further specific R&D for magnet sub-systems (parts, tooling, etc.) or fabrication process needed?
Review Panel
Toru Ogitsu (KEK, Chair)
Davide Tommasini (CERN)
Shlomo Caspi (LBNL)
Kiyosumi Tsuchiya (KEK)
Link persons:
Tatsushi Nakamoto (KEK) and Ezio Todesco (CERN)
