Studies on the Magnetic Center of the Mu2e Solenoid System

Andreev

Cheban

et al. 2014

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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 magnet system for this experiment is made of three warm-bore solenoids: the Production Solenoid (PS), the Transport Solenoid (TS), and the Detector Solenoid (DS). The TS is an "S-shaped" solenoid set between the other bigger solenoids. The Transport Solenoid has a warm-bore aperture of 0.5 m and field between 2.5 and 2.0 T. The PS and DS have respectively warm-bore aperture of 1.5 m and 1.9 m, and peak field of 4.6 T and 2 T.In order to meet the field specifications the TS starts inside the PS and ends inside the DS. The strong coupling with the adjacent solenoids poses several challenges to the design and operation of the Transport Solenoid. The coil layout has to compensate for the fringe field of the adjacent solenoids. The quench protection system should handle all possible quench and failure scenarios in all three solenoids. The support system has to be able to withstand very different forces depending on the powering status of the adjacent solenoids.In this paper the conceptual design of the Transport Solenoid is presented and discussed focusing on these coupling issues and the proposed solutions.

“…The drift is also proportional to the momentum of the particles. An asymmetric collimator [7] placed in the second straight section (TS3) makes the charge and momentum selection.…”

Section: Magnetic Designmentioning

confidence: 99%

Section: Magnetic Designmentioning

confidence: 99%

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

Andreev

Cheban

et al. 2014

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“…Even in the presence of large positioning errors the TS fulfills the magnetic requirements. The mechanical tolerances for the TS coils are given by other sources [5].…”

Section: Discussionmentioning

confidence: 99%

“…These errors, however, have a much smaller impact in the magnetic performance. In particular, the systematic changes needed to correct the magnetic center position [5] do not cause any violation of the magnetic requirements. As an example of systematic error, Figure 8 The DS is mainly divided into three sections: DS1 (gradient region), DS2 (transition region), DS3-4 (spectrometer and calorimeter region).…”

Section: Transport Solenoid Tolerancesmentioning

confidence: 98%

Tolerance Studies of the Mu2e Solenoid System

Lopes

Buehler

et al. 2014

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Abstract-The Muon-to-electron conversion experiment (Mu2e) at Fermilab is designed to explore charged lepton flavor violation. It is composed by three large superconducting solenoids: the production solenoid (PS), the transport solenoid (TS) and the detector solenoid (DS). Each sub-system has a set of field requirements. The tolerance sensitivity studies of the magnet system were performed with the objective to demonstrate that the present magnet design meets all the field requirements. Systematic and random errors were considered on the position and alignment of the coils. The study helps to identify the critical sources of errors and which are translated to coil manufacturing and mechanical supports tolerances.

“…For the transport solenoid, the angular coil orientation during operation-cold and powered-is very important in order to obtain the proper magnetic alignment [7]. In the particular case of the TS prototype, the angle between the two coils has to be 5.5 ± 0.2 • at operating conditions.…”

Section: Magnetic Measurementsmentioning

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.