Development of the quench protection heater for superconducting dipole magnet for High-Luminosity LHC upgrade
鈴木 研人, 飯田 真久, 池本 由希子, 大畠 洋克, 岡田 尚起, 岡田 竜太郎, 荻津 透, 川又 弘史, 木村 誠宏, 佐々木 憲一, 高橋 直人, 田中 賢一, 中本 建志, 東 憲夫 （KEK）； Musso Andrea, Todesco Ezio （CERN）
Abstract:Installation of the High Luminosity Large Hadron Collider (HL-LHC) will take place around 2025, where the existing final beam focusing superconducting magnet system will be upgraded so as to improve luminosity performance of the machine.
High Energy Accelerator Research Organization (KEK) has been engaged in the HL-LHC project and has been in charge of development and construction of NbTi based superconducting dipole magnet for the beam separation (D1) in the final beam focusing magnet system.
Prior to manufacturing 7m-long full-scale magnets, three 2m-long model magnets have been designed, manufactured and tested at KEK so far.
One of the challenges in operating the new D1 magnet is the quench protection: stored energy of the magnet, which is estimated to be 2.13 MJ, has to be safely dissipated only by the quench protection heater (QH) to limit the maximum coil temperature well below 300 K despite the higher engineering current density of 600 A/mm2. Therefore, the QH design covering heater size, pattern, position with respect to the coil, and connection scheme has to be performed properly so that normal-zone can effectively propagate through the entire coil to suppress the maximum coil temperature.
Design study of the QH was performed using our developed simulation code and the final design was validated through the power test of the model magnets.
In this talk, we will report results of the design study and the power test of the model magnets. Finally, we will introduce the prospect of QH performance in the full-scale D1 prototype magnet to be tested in 2020.