Sergey Cheban

Bio: Sergey Cheban is an academic researcher from Fermilab. The author has contributed to research in topics: Solenoid & Physics. The author has an hindex of 5, co-authored 13 publications receiving 58 citations.

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

Abstract: 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.

Reference Design of the Mu2e Detector Solenoid

Abstract: The Mu2e experiment at Fermilab has been approved by the Department of Energy to proceed with the development of the preliminary design. Integral to the success of Mu2e is the superconducting solenoid system. One of the three major solenoids is the detector solenoid that houses the stopping target and the detectors. The goal of the detector solenoid team is to produce detailed design specifications that are sufficient for vendors to produce the final design drawings, tooling and fabrication procedures and proceed to production. In this paper we summarize the reference design of the detector solenoid.

Performance of Conduction Cooled Splittable Superconducting Magnet Package for Linear Accelerators

Abstract: New linear superconducting accelerators need superconducting magnet packages installed inside SCRF cryomodules to focus and steer electron or proton beams. A superconducting magnet package was designed and built as a collaborative effort of FNAL and KEK. The magnet package includes one quadrupole and two dipole windings. It has a splittable in the vertical plane configuration and features for conduction cooling. The magnet was successfully tested at room temperature, in a liquid He bath, and in a conduction cooling experiment. This paper describes the design and test results, including magnet cooling, training, and magnetic measurements by rotational coils. The effects of superconductor and iron yoke magnetization, hysteresis, and fringe fields are discussed.

Improvements and Performance of the Fermilab Solenoid Test Facility

Abstract: The Solenoid Test Facility at Fermilab was built using a large vacuum vessel for testing of conduction-cooled superconducting solenoid magnets, and was first used to determine the performance of the MICE Coupling Coil [1, 2] The facility was modified recently to enable testing of solenoid magnets for the Mu2e experiment, which operate at much higher current than the Coupling Coil One pair of low current conduction-cooled copper and NbTi leads was replaced with two pairs of 10 kA HTS leads cooled by heat exchange with liquid nitrogen and liquid helium The new design, with additional control and monitoring capability, also provides helium cooling of the superconducting magnet leads by conduction A high current power supply with energy extraction was added, and several improvements to the quench protection and characterization system were made Here we present details of these changes and report on performance results from a test of the Mu2e prototype Transport Solenoid (TS) module Progress on additional improvements in preparation for production TS module testing will be presented

Mu2e Transport Solenoid Prototype Design and Manufacturing

Abstract: The Mu2e Transport Solenoid consists of fifty-two coils arranged in twenty-seven coil modules that form the S- shaped cold mass. Each coil is wound from Al-stabilized NbTi superconductor. The coils are supported by an external structural aluminum shell machined from a forged billet. Most of the coil modules house two coils with the axis of each coil oriented at an angle of approximately five degrees with respect to each other. The coils are indirectly cooled with LHe circulating in tubes welded on the shell. In order to enhance the cooling capacity, pure aluminum sheets connect the inner bore of the coils to the cooling tubes. The coils are placed inside the shell by the means of a shrink fit procedure. A full-size prototype, with all the features of the full assembly, was successfully manufactured in a collaboration between INFN-Genoa and Fermilab. In order to ensure an optimal mechanical pre-stress at the coil-shell interface, the coils are inserted into the shell through a shrink fitting process. We present the details of the prototype with the design choices as validated by the structural analysis. The fabrication steps are described as well.  Index Terms—Superconducting Magnets, Solenoids, Accelerator Magnets

Mu2e Transport Solenoid Prototype Tests Results

Abstract: 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.

Forced two phase helium cooling of large superconducting magnets

Abstract: ^EL- m Lawrence Berkeley Laboratory UNIVERSITY OF CALIFORNIA. BERKELEY Engineering & Technicai Services Division Presented at the 21st Cryogenic Eru ^nee- Conference, Madisor,. ;•.'], - uTiSt CONSTRUCTION A'.P TLSTI'.u ' F HI', SUPtPCOJvDlX !'.' SCLF'.C T M. A. Green, F. H. Fberhard J. L. Taylor ' V? Auaust 1979 Prepared for the U. Department of Energy under Contract W-7405-ENG-48

Automated lumped-element simulation framework for modelling of transient effects in superconducting magnets

Abstract: The paper describes a flexible, extensible, and user-friendly framework to model electrothermal transients occurring in superconducting magnets Simulations are a fundamental tool for assessing the performance of a magnet and its protection system against the effects of a sudden transition from the superconducting to the normal state (also known as a quench) The application has a scalable and modular architecture based on the object-oriented programming paradigm, which opens an easy way for future extensions Models are composed of thousands of lumped-element blocks automatically created in MATLAB&Simulink Additionally, it is possible to run sets of simulations with varying parameters and model structure Due to its flexibility the framework has been used to simulate various protection and magnet configurations The experimental results were in a very good agreement with simulations

Electromagnetic and Rotational Characteristics of a Superconducting Flywheel Energy Storage System Utilizing a Radial-Type High-Temperature Superconducting Bearing

Abstract: A 2 kW/28.5 kJ superconducting flywheel energy storage system (SFESS) with a radial-type high-temperature superconducting (HTS) bearing was set up to study the electromagnetic and rotational characteristics. The structure of the SFESS as well as the design of its main parts was reported. A mathematical model based on the finite element method (FEM) was established to research the electromagnetic characteristics of the HTS bearing during the levitation process, which show that a part of the magnetic flux penetrates into the edge of the HTS bulks and then goes back to the opposite pole of the permanent magnet rotor (PMR). The induced current mainly distributes in the edge of the HTS bulks, indicating that larger force acts on the edge part of the HTS bulks and probably causes them to crack. The free rotations of the rotor at different steady-state speeds of 2500–5000 rpm and its radial vibration were displayed. The induced voltage of the stator winding of the motor in this process was analyzed. The rotational characteristics are related to the vibration of the rotor. Below the resonant frequency, the vibration increases significantly with the speed. Enhancing the radial stiffness to limit the vibration amplitude of the rotor is an effective approach to improve the speed.