High Intensity Neutrino Source Superconducting Solenoid Cryostat Design

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Abstract-Fermi National Accelerator Laboratory is involved in the development of a 60 MeV superconducting linac. This linac is part of the High Intensity Neutrino Source (HINS) R&D Program. The initial beam acceleration in the front end section of the linac is achieved using room temperature spoke cavities, each of which is combined with a superconducting focusing solenoid. These solenoid magnets are cooled with liquid helium at 4.5K, operate at 250 A and have a maximum magnetic field strength of 7.5 T. A prototype solenoid cryostat was built and tested at the Fermilab Magnet Test Facility. This paper discusses the test results of the prototype and compares the measured and estimated performance of the cryostat. We also present the methods and results for measuring and fiducializing the axis of the solenoid lens.

“…A cross section of the production Type-1 solenoid cryostat is shown in Fig. 2 [9]. The prototype cryostat differs from the production Type-1 cryostat in two ways.…”

Section: Introductionmentioning

confidence: 99%

HINS Superconducting Lens and Cryostat Performance

Page

DiMarco

Huang

et al. 2009

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“…The superconducting solenoid cryostat [4] was initially designed for Type-1 lenses, with HTS current leads to limit the use of helium. The introduction of steering coils requires three pairs of current leads, and vapor-cooled resistive leads were specified.…”

Section: Cryostat Assembliesmentioning

confidence: 99%

Certification of Superconducting Solenoid-Based Focusing Lenses

Di-Marco

Hemmati

Orris

et al. 2011

Abstract-The first production focusing lens for the HINS beam line at Fermilab has been assembled into a cryostat and tested. A total of 5 devices will be tested before they are installed in the low energy section of the HINS beam line, which uses copper Crossbar-H (CH) style RF cavities. One of the tested CHsection lens assemblies includes a pair of weak orthogonal steering dipoles nested within a strong focusing solenoid, and has six vapor cooled power leads. The other device has only the strong focusing solenoid, and utilizes a single pair of HTS power leads. The production test program is designed to measure the thermal performance of the cryostat, minimum cooling requirements for the HTS leads, quench performance of all superconducting components, and precise determination of the magnetic axis and field angles. Results and future plans for the first production device tests are presented.

“…Assembled and tested cold masses are to be placed in cryovessels at FNAL to form completed focusing lenses. Description of the cryostat design can be found in [15]. These cryostats will be connected in series mechanically and in parallel cryogenically using a header -a pipe that contains LHe and LN2 supply and return lines.…”

Section: Ch Section Lens Production and Certificationmentioning

confidence: 99%

HINS Linac Front End Focusing System R&D

Apollinari

Carcagno

DiMarco

et al. 2009

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This report summarizes current status of an R&D program to develop a focusing system for the front end of a superconducting RF linac. Superconducting solenoids will be used as focusing lenses in the low energy accelerating sections of the front end. The development of focusing lenses for the first accelerating section is in the production stage, and lens certification activities are in preparation at FNAL. The report contains information about the focusing lens design and performance, including solenoid, dipole corrector, and power leads, and about cryogenic system design and performance. It also describes the lens magnetic axis position measurement technique and discusses scope of an acceptance/certification process.