| Published Articles | |
| Report number | FERMILAB-PUB-21-038-TD |
| Title | Magnetic Field Measurements of First Pre-series Full-Length 4.2 m Quadrupole MQXFA03 Using PCB Rotating Coils for the Hi-Lumi LHC Project |
| Author(s) | Song, Honghai (Stony Brook U.) ; Ambrosio, Giorgio (Fermilab) ; Amm, Kathleen (Brookhaven) ; Anerella, Michael (Brookhaven) ; Apollinari, Giorgio (Fermilab) ; Cheng, Daniel (LBNL) ; Chlachidze, Guram (Fermilab) ; DiMarco, Joseph (Fermilab) ; Feher, Sandor (Fermilab) ; Ferracin, Paolo (LBNL) ; Izquierdo Bermudez, Susana (CERN) ; Jain, Animesh (Argonne) ; Joshi, Piyush (Brookhaven) ; Muratore, Joseph (Brookhaven) ; Pan, Heng (LBNL) ; Sabbi, GianLuca (LBNL) ; Schmalzle, Jesse (Brookhaven) ; Todesco, Ezio (CERN) ; Wanderer, Peter (Brookhaven) ; Wang, Xiaorong (LBNL) ; Yu, Miao (Fermilab) |
| Publication | 2021 |
| Imprint | 2021-02-08 |
| Number of pages | 7 |
| In: | IEEE Trans. Appl. Supercond. 31 (2021) 4000207 |
| In: | Applied Superconductivity Conference, Online, 24 Oct - 7 Nov 2020, pp.4000207 |
| DOI | 10.1109/TASC.2021.3053510 |
| Subject category | Accelerators and Storage Rings |
| Accelerator/Facility, Experiment | LARP CERN LHC |
| Project | CERN HL-LHC |
| Abstract | The U.S. Hi-Lumi LHC Accelerator Upgrade Project (AUP) and CERN have joined efforts to develop high field quad-rupoles for the Hi-Lumi LHC upgrade. The US national laborato-ries in the AUP project will deliver 10 magnets and each cryostat has two 4.2 m high gradient quadrupoles in it. These magnets are made of Nb3Sn conductors, with large aperture (150 mm) and in-tegrated gradient of 556.9 T. This paper reports on magnetic measurements performed during the vertical test at Brookhaven National Laboratory (BNL) in 2019-2020. A warm measurement Z-Scan (+/- 15 A) with 42 Z-positions before cool-down was per-formed at BNL. The results were directly compared to field data measured at LBNL during magnet assembly. Measured harmonics and magnetic center offsets (ΔX and ΔY) have provided timely and informative diagnostics on the magnet structure’s shape at both warm and cold temperatures. A new centering fixture was de-signed and added to better center the warm bore tube which con-tains the rotating coil probe. After the quench training to 16.47 kA was achieved, a complete set of cold measurements (Z-Scan at 16.47 kA and I-Scan from 960 A to 16.47 kA and back to 960 A) was made. Periodic axial variation of allowed and nonallowed harmonics was observed which is related to the coil radial and/or mid-plane variations along the magnet axis. Overall, the average harmonics in the straight section are within the required field boundaries. |
| Copyright/License | © 2021-2024 IEEE |
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Element opprettet 2021-03-26, sist endret 2021-04-20