Challenges and Design of the Transport Solenoid for the Mu2e Experiment at Fermilab

Evbota

et al. 2015

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The Fermilab Mu2e experiment seeks to measure the rare process of direct muon to electron conversion in the field of a nucleus. The experiment makes use of three large superconducting solenoids: the production solenoid (PS), the transport solenoid (TS), and the detector solenoid (DS). The TS is an "S-shaped" solenoid with a warm-bore aperture of half a meter and field between 2.5 and 2.0 T. The three solenoids are based on four different types of Al stabilized NbTi conductors. All the conductors are composed of a Rutherford cable embedded in an aluminum matrix through a conforming process. This paper describes the various steps that led to the successful procurement of 3 km of Al-stabilized prototype cable for the Mu2e TS. The main cable properties and results of electrical and mechanical tests are presented and discussed for each stage of the cable development process. Results are compared to design values to show how the prototype cable lengths satisfied all the design criteria starting from the NbTi wires all the way to the Al-stabilized cables. Following the successful completion of this initial phase, the TS prototype cable is currently being used to manufacture a prototype TS coil in industry. The cable production phase has recently been launched, with the goal of producing 700 km of superconducting wire for a total of 44 km of TS Al-stabilized cable needed to build the entire Transport Solenoid system.

Section: Transport Solenoid Aluminum Stabilized Cablementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Aluminum Stabilized Superconducting Prototype Cable Development for the Mu2e Transport Solenoid

Lombardo

Evbota

et al. 2015

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“…According to the requirements document [11], the PS magnet should have field gradient along the axis with the peak axial field of 4.6 T and the field at the interface with the Transport Solenoid (TS) [12] of 2.5-2.7 T. In order to fulfill this requirement, the magnet consists of three sections with 3, 2 and 2 layers of the cable described in Fig. 1 and Table I, wound in the hard way around the aperture.…”

Section: A Magnetic Designmentioning

confidence: 99%

Conceptual Design of the Mu2e Production Solenoid

Kashikhin

Andreev

et al. 2013

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Abstract-The Muon-to-Electron conversion experiment (Mu2e), under development at Fermilab, seeks to detect direct muon to electron conversion to provide evidence for a process violating muon and electron lepton number conservation that cannot be explained by the Standard Model of Particle Physics. The required magnetic field is produced by a series of superconducting solenoids. This paper describes the conceptual design of the 5 T, 4 m long solenoid with 1.7 m bore with the emphasis on the electromagnetic and structural analyses.

“…1. It is primarily formed by three large solenoid systems: the Production Solenoid (PS) [2], the Transport Solenoid (TS) [3] and the Detector Solenoid (DS) [4].…”

Section: Introductionmentioning

confidence: 99%

Mu2e Transport Solenoid Prototype Tests Results

Lopes

Badgley

et al. 2016

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The Fermilab Mu2e experiment has been developed to search for evidence of charged lepton flavor violation through the direct conversion of muons into electrons. The transport solenoid is an s-shaped magnet that guides the muons from the source to the stopping target. It consists of 52 superconducting coils arranged in 27 coil modules. A full-size prototype coil module, with all the features of a typical module of the full assembly, was successfully manufactured by a collaboration between INFN-Genoa and Fermilab. The prototype contains two coils that can be powered independently. To validate the design, the magnet went through an extensive test campaign. Warm tests included magnetic measurements with a vibrating stretched wire and electrical and dimensional checks. The cold performance was evaluated by a series of power tests and temperature dependence and minimum quench energy studies.