Mu2e Transport Solenoid Prototype Tests Results

Lopes, M. L.; Ambrosio, G.; Badgley, Karie; DiMarco, J.; Evbota, D.; Fabbricatore, P.; Farinon, S.; Fehér, S.; Friedsam, H.; Galt, Artur; Hays, S.; Hocker, James Andrew; Kim, Do Young; Kokoska, Lidija; Koshelev, Sergey; Kotelnikov, S.K.; Lamm, M.J.; Makulski, A.; Marchevsky, M.; Nehring, R.; Nogiec, Jerzy; Orris, D.; Pilipenko, Roman; Rabehl, R.; Santini, Carlo; Sylvester, C.; Tartaglia, M.

doi:10.1109/tasc.2016.2526619

Cited by 6 publications

(2 citation statements)

References 12 publications

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“…The TS solenoid is wrapped in 40 layers of multi-layer insulation and cooled in vacuum with liquid helium flowing through the two pipeline encircling the aluminum shell of the solenoid [10]. The cooldown rate was mostly stable at ∼4 K/h.…”

Section: A Cooldownmentioning

confidence: 99%

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Localization of Quenches and Mechanical Disturbances in the Mu2e Transport Solenoid Prototype Using Acoustic Emission Technique

Marchevsky¹,

Ambrosio²,

Lamm³

et al. 2016

IEEE Trans. Appl. Supercond.

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Acoustic emission (AE) detection is a noninvasive technique allowing the localization of the mechanical events and quenches in superconducting magnets. Application of the AE technique is especially advantageous in situations where magnet integrity can be jeopardized by the use of voltage taps or inductive pickup coils. As the prototype module of the transport solenoid (TS) for the Mu2e experiment at Fermilab represents such a special case, we have developed a dedicated six-channel AE detection system and accompanying software aimed at localizing mechanical events during the coil cold testing. The AE sensors based on transversely polarized piezoceramic washers combined with cryogenic preamplifiers were mounted at the outer surface of the solenoid aluminum shell, with a 60 • angular step around the circumference. Acoustic signals were simultaneously acquired at a rate of 500 kS/s, prefiltered and sorted based on their arrival time. Next, based on the arrival timing, angular and axial coordinates of the AE sources within the magnet structure were calculated. We present AE measurement results obtained during cooldown, spot heater firing, and spontaneous quenching of the Mu2e TS module prototype and discuss their relevance for mechanical stability assessment and quench localization.

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Section: A Cooldownmentioning

confidence: 99%

“…4. A heater in the "upper" coil [10] was fired, and the quench in this coil followed in ∼320 ms. The fairly large discrepancy of ∼30 deg.…”

Section: B Spot Heater Firingmentioning

confidence: 99%

Localization of Quenches and Mechanical Disturbances in the Mu2e Transport Solenoid Prototype Using Acoustic Emission Technique

Marchevsky¹,

Ambrosio²,

Lamm³

et al. 2016

IEEE Trans. Appl. Supercond.

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Design and fabrication of the Mu2e cryogenic distribution system

White

Lamm

Höcker

et al. 2020

IOP Conf. Ser.: Mater. Sci. Eng.

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The muon-to-electron conversion (Mu2e) experiment at Fermilab will be used to search for the charged lepton flavor-violating conversion of muons to electrons in the field of an atomic nucleus. The Mu2e experiment is currently in the design and construction stage and is expected to begin operations in 2022. The Mu2e experiment uses four large superconducting solenoid magnets including a Production Solenoid (PS), an Upstream and Downstream Transport Solenoid (TSu and TSd) and a Detector Solenoid (DS). This paper will focus on the cryogenic distribution system for these four solenoid magnets. Liquid helium will be supplied from two re-purposed Tevatron satellite refrigerators. A large cryogenic distribution box (DB) is located in the Mu2e building to distribute the required cryogens to each of the four solenoid magnets. Each solenoid magnet will have a dedicated transfer line and cryogenic feed box (FB). The solenoid magnets each require two liquid helium circuits and two liquid nitrogen circuits. The most unique feature about this cryogenic system is that the assemblies for the start of the superconducting portion of the power leads are mounted in feed boxes that are in the range of 23 m to 31 m away from the solenoid magnets. The cryogenic feed boxes are located remotely to provide protection from radiation damage and high magnetic fields. The power leads are NbTi superconducting cable stabilized with high conductivity aluminum. The 6061-T6 aluminum grade was selected for the transfer line piping so that the piping would thermally contract at the same rate as the power lead. A major concern for this transfer line is that a small helium leak could create an electric discharge arc due to the Paschen effect. This paper includes a description of the design features and testing done to ensure that the power leads are protected from the Paschen effect while still being adequately cooled to liquid helium temperatures.

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