Field Quality Measurements and Analysis of the LARP Technology Quadrupole Models

Velev, G.; Bossert, R.; Caspi, S.; Chlachidze, G.; DiMarco, J.; Ferracin, P.; Kashikhin, V.V.; Lamm, M. J.; Sabbi, G.; Schlabach, P.; Tartaglia, M.; Tompkins, J.; Zlobin, A.V.

doi:10.1109/tasc.2008.922272

Cited by 12 publications

(7 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…6, upper line). The magnet behavior fully reproduced the results from LQS01 [8] and was similar to the TQ model quadrupoles [5]. Moreover, the effect of the long-term decay and snap-back was not observed in dipole model magnets made of similar conductors [13].…”

Section: E Long-term Dynamic Effects: Decay and Snap-backsupporting

confidence: 72%

“…In an earlier step, two 1-m long quadrupole models (so-called technology quadrupoles, TQC and TQS with 90 mm aperture) assembled with the same type of coils in different supporting structures were built and tested. Elsewhere [2]- [5], one can find detailed information about the designs, production, quench performance and field quality measurements of the TQ magnets.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Field Quality Study of the LARP ${\rm Nb}_{3}{\rm Sn}$ 3.7 m-Long Quadrupole Models of LQ series

Velev

Ambrosio

Andreev

et al. 2012

IEEE Trans. Appl. Supercond.

Self Cite

View full text Add to dashboard Cite

After the successful test of the first long quadrupole magnet (LQS01), the US LHC Accelerator Research Program (LARP) has assembled and tested a new 3.7 m-long quadrupole (LQS02). This magnet has four new coils made of the same conductor as LQS01 coils, and it is using the same support structure. LQS02 was tested at the Fermilab Vertical Magnet Test Facility with the main goal to confirm that the long models can achieve field gradient above 200 T/m, LARP target for 90-mm aperture, as well as to measure the field quality. These long models lack some alignment features and it is important to study the field harmonics. Previous field quality measurements of LQS01 showed higher than expected differences between measured and calculated harmonics compared to the short models (TQS) assembled in a similar structure. These differences could be explained by the use of two different impregnation fixtures during coil fabrication. In this paper, we present a comparison of the field quality measurements between LQS01 and LQS02 as well as a comparison with the short TQS models. If the result supports the coil fabrication hypothesis, another LQS assembly with all coils fabricated in the same fixture will be produced for understanding the cause of the discrepancy between short and long models.Index Terms-Magnetic field measurement, super-conducting accelerator magnets.

show abstract

Section: E Long-term Dynamic Effects: Decay and Snap-backsupporting

confidence: 72%

mentioning

confidence: 99%

Field Quality Study of the LARP ${\rm Nb}_{3}{\rm Sn}$ 3.7 m-Long Quadrupole Models of LQ series

Velev

Ambrosio

Andreev

et al. 2012

IEEE Trans. Appl. Supercond.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Measured quench propagation velocities varied between 15-50 m/s. Magnetic measurements were performed on the TQ magnets and results reported in [20], [21].…”

Section: A Quench Performancementioning

confidence: 99%

Test Results of LARP ${\rm Nb}_{3}{\rm Sn}$ Quadrupole Magnets Using a Shell-Based Support Structure (TQS)

Caspi

Dietderich

Félice

et al. 2009

IEEE Trans. Appl. Supercond.

Self Cite

View full text Add to dashboard Cite

Amongst the magnet development program of a large-aperture Nb 3 Sn superconducting quadrupole for the Large Hadron Collider luminosity upgrade, six quadrupole magnets were built and tested using a shell based key and bladder technology (TQS). The 1 m long 90 mm aperture magnets are part of the US LHC Accelerator Research Program (LARP) aimed at demonstrating Nb 3 Sn technology by the year 2009, of a 3.6 m long magnet capable of achieving 200 T/m. In support of the LARP program the TQS magnets were tested at three different laboratories, LBNL, FNAL and CERN and while at CERN a technology-transfer and a four days magnet disassembly and reassembly were included. This paper summarizes the fabrication, assembly, cool-down and test results of the six magnets and compares measurements with design expectations.

show abstract

“…All the TQ02 magnets showed a degraded performance at 1.9 K with respect to 4.5 K. Possible causes, like conductor damage during fabrication coupled with self-field effects in magneto-thermal instabilities of Nb 3 Sn strands [26], are under investigation. Field quality measurements were taken during both TQC and TQS magnet tests [27]: although field quality was not among the goals of the TQ program, the measured homogeneity of the field along the axis was comparable to the standards values observed in NbTi magnets [28].…”

Section: Technology Quadrupole Magnets (Tq)mentioning

confidence: 99%

LARP Nb[sub 3]Sn QUADRUPOLE MAGNETS FOR THE LHC LUMINOSITY UPGRADE

Ferracin

Weisend²

2010

AIP Conference Proceedings

Self Cite

View full text Add to dashboard Cite

The US LHC Accelerator Research Program (LARP) is a collaboration between four US laboratories (BNL, FNAL, LBNL, and SLAC) aimed at contributing to the commissioning and operation of the LHC and conducting R&D on its luminosity upgrade. Within LARP, the Magnet Program's main goal is to demonstrate that Nb 3 Sn superconducting magnets are a viable option for a future upgrade of the LHC Interaction Regions. Over the past four years, LARP has successfully fabricated and tested several R&D magnets: 1) the subscale quadrupole magnet SQ, to perform technology studies with 300 mm long racetrack coils, 2) the technology quadrupole TQ, to investigate support structure behavior with 1 m long cos2θ coils, and 3) the long racetrack magnet LR, to test 3.6 m long racetrack coils. The next milestone consists in the fabrication and test of the 3.7 m long quadrupole magnet LQ, with the goal of demonstrating that Nb 3 Sn technology is mature for use in high energy accelerators. After an overview of design features and test results of the LARP magnets fabricated so far, this paper focuses on the status of the fabrication of LQ: we describe the production of the 3.4 m long cos2θ coils, and the qualification of the support structure. Finally, the status of the development of the next 1 m long model HQ, conceived to explore stress and field limits of Nb 3 Sn superconducting magnets, is presented.

show abstract

Field Quality Measurements and Analysis of the LARP Technology Quadrupole Models

Cited by 12 publications

References 11 publications

Field Quality Study of the LARP ${\rm Nb}_{3}{\rm Sn}$ 3.7 m-Long Quadrupole Models of LQ series

Field Quality Study of the LARP ${\rm Nb}_{3}{\rm Sn}$ 3.7 m-Long Quadrupole Models of LQ series

Test Results of LARP ${\rm Nb}_{3}{\rm Sn}$ Quadrupole Magnets Using a Shell-Based Support Structure (TQS)

LARP Nb[sub 3]Sn QUADRUPOLE MAGNETS FOR THE LHC LUMINOSITY UPGRADE

Contact Info

Product

Resources

About