Design of MARCO, the New Solenoidal Detector Magnet for the ePIC Experiment at BNL

IF 1.8 3区物理与天体物理 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Transactions on Applied Superconductivity Pub Date : 2025-09-10 DOI:10.1109/TASC.2025.3608471

Valerio Calvelli;Christophe Berriaud;Clément Genot;Probir K. Ghoshal;Sandesh Gopinath;François-Paul Juster;Victor Kleymenov;Jean-Pierre Lottin;Lionel Quettier;Hugo Reymond;Michel Segreti;Rahul Sharma;Damien Simon;Francesco Stacchi;Eric Sun;Roberto Than;Roland Wimmer;Daniel Young;Elke Aschenauer;Rolf Ent;R. Rajput-Ghoshal

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Abstract

Magnet with renewed coils (MARCO) is the new superconducting solenoid for electron-proton/ion collider (ePIC), the general-purpose detector capable of delivering the full scientific scope of the electron–ion collider at Brookhaven National Laboratory (BNL). This 3.84-m-long solenoid, with a bore diameter of 2.84 m, will provide a magnetic field of 2.0 T at the center with a nominal current of 4 kA at 4.5 K, for a total stored energy of 45 MJ. Its conductor is an NbTi Rutherford in copper channel, specially designed to stand the high mechanical loads induced by the magnetic field. Its copper stabilizer will assure the protection in case of quench. The coils are wound into six layers inside a thin external mandrel in brass, with a triple role of mechanical reinforcement, cryogenic support for the thermosiphon circuit, and quench-back propagator. With a cold mass average radial thickness of just 7 cm, the magnet fulfills all the criteria of transparency for the particles directed to the hadronic calorimeter forecast around the cryostat. In this article, the design of MARCO is presented with a specific focus on the magnetic and quench analysis.

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BNL ePIC实验用新型螺线管探测磁体MARCO的设计

新线圈磁铁（MARCO）是电子-质子/离子对撞机（ePIC）的新型超导螺线管，是布鲁克海文国家实验室（BNL）的通用探测器，能够提供电子-离子对撞机的全部科学范围。这个3.84米长的螺线管，直径为2.84米，将在中心提供2.0 T的磁场，4.5 K时的标称电流为4 kA，总存储能量为45兆焦耳。它的导体是铜槽内的铌钛卢瑟福合金，专为承受由磁场引起的高机械负荷而设计。它的铜稳定剂将确保在淬火情况下的保护。这些线圈被缠绕成六层，在一个薄的外部黄铜芯轴内，具有机械加固、低温支持热虹吸电路和淬火传播器的三重作用。该磁体的冷质量平均径向厚度仅为7厘米，满足了低温恒温器周围的强子量热计预测的粒子透明度的所有标准。在本文中，介绍了MARCO的设计，重点介绍了磁和淬火分析。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

IEEE Transactions on Applied Superconductivity 工程技术-工程：电子与电气

CiteScore

3.50

自引率

33.30%

发文量

650

审稿时长

2.3 months

期刊介绍： IEEE Transactions on Applied Superconductivity (TAS) contains articles on the applications of superconductivity and other relevant technology. Electronic applications include analog and digital circuits employing thin films and active devices such as Josephson junctions. Large scale applications include magnets for power applications such as motors and generators, for magnetic resonance, for accelerators, and cable applications such as power transmission.