Certification of Superconducting Solenoid-Based Focusing Lenses

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.

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“…The angle between the two coils was measured using the vibrating stretched wire technique [8] (Fig. 3).…”

Section: Magnetic Measurementsmentioning

confidence: 99%

Mu2e Transport Solenoid Prototype Tests Results

Lopes

Ambrosio

Badgley

et al. 2016

IEEE Trans. Appl. Supercond.

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“…Furthermore, it is not yet completely clear how the magnetic axis found this way relates to the behavior of charged particles moving through the lens. Studies of the lens optical properties based upon particle tracking and simulation of the wire techniques [19] suggest these axes may differ at the level of 100 µm. An alternative approach using Hall probes to find the coil magnetic centers may yield complementary information to the wire technique, and is presently under study at Fermilab [20].…”

Section: Lens Alignment Issuesmentioning

confidence: 99%

Design and Performance of Focusing Lenses for Installation Into Superconducting Cryomodules of a Proton Linac

Nicol

Sergatskov

Tartaglia

et al. 2011

IEEE Trans. Appl. Supercond.

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The high energy sections of the Fermilab HINS R&D proton linac will utilize superconducting spoke resonator (SSR) RF cavities. These will be assembled into cryomodules with strong solenoid focusing lenses closely interleaved with the cavities. A design for lenses has been made for the lower (SSR1) and higher (SSR2) energy ranges of the SSR-section. Prototype lenses for both SSR1 and SSR2 sections have been built and the SSR1 has been tested. Shielding is needed to reduce the solenoid fringe field on the cavity wall below the 10 µT level, and a preliminary design was built and tested with the SSR1 prototype lens. We discuss the design requirements and challenges, and the results from quench testing and magnetic measurements of the SSR1 prototype lens.

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“…The voltage induced in the transducer is then acquired and integrated digitally in order to yield the flux linkage as a function of the linear position, measured by a laser interferometer. In the literature, the methods to align solenoids can be grouped in three main categories 17 : (i) the single stretched-wire methods 18 , 19 , (ii) the vibrating-wire methods 20 – 22 and (iii) the Hall transducer-based methods 15 , 23 .…”

Section: Introductionmentioning

confidence: 99%

Measuring the magnetic axis alignment during solenoids working

Arpaïa

Celano

Vito

et al. 2018

Sci Rep

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A method for monitoring the misalignment of the magnetic axis in solenoids is proposed. This method requires only a few measurements of the magnetic field at fixed positions inside the magnet aperture, and thus overcomes the main drawback of sturdy moving mechanics of other Hall sensor-based methods. Conversely to state-of-the-art axis determination, the proposed method can be applied also during magnet operations, when the axis region and almost the whole remaining magnet aperture are not accessible. Moreover, only a few measurements of the magnetic field at fixed positions inside the magnet aperture are required: thus a slow process such as the mapping of the whole aperture of a magnet by means of moving stages is not necessary. The mathematical formulation of the method is explained, and a case study on a model of a multi–layer solenoid is presented. For this case study, the uncertainty is assessed and the optimal placement of the Hall transducers is derived.

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Certification of Superconducting Solenoid-Based Focusing Lenses

Cited by 5 publications

References 7 publications

Mu2e Transport Solenoid Prototype Tests Results

Mu2e Transport Solenoid Prototype Tests Results

Design and Performance of Focusing Lenses for Installation Into Superconducting Cryomodules of a Proton Linac

Measuring the magnetic axis alignment during solenoids working

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