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Title: Field quality measurements and abalysis of the LARP technology quadrupole models

Abstract

One of the US-LHC accelerator research program goals is to develop and prove the design and technology of Nb{sub 3}Sn quadrupoles for an upgrade of the LHC Interaction Region (IR) inner triplets. Four 1-m long technology quadrupole models with a 90 mm bore and field gradient of 200 T/m based on similar coils and different mechanical structures have been developed. In this paper, we present the field quality measurements of the first several models performed at room temperature as well as at superfluid helium temperature in a wide field range. The measured field harmonics are compared to the calculated ones. The field quality of Nb{sub 3}Sn quadrupole models is compared with the NbTi quadrupoles recently produced at Fermilab for the first generation LHC IRs.

Authors:
; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
924526
Report Number(s):
FERMILAB-CONF-07-428-TD
TRN: US0802907
DOE Contract Number:
AC02-07CH11359
Resource Type:
Conference
Resource Relation:
Conference: Presented at 20th International Conference on Magnet Technology (MT20), Philadelphia, Pennsylvania, 27-31 Aug 2007
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; ACCELERATORS; DESIGN; FERMILAB; HARMONICS; HELIUM; MAGNETS; MECHANICAL STRUCTURES; QUADRUPOLES; RESEARCH PROGRAMS; TRIPLETS; Accelerators

Citation Formats

Bossert, R., Chlachidze, G., DiMarco, J., Kashikhin, V.V., Lamm, M., Schlabach, P., Tartaglia, M., Tompkins, J.C., Velev, G.V., Zlobin, A.V., Caspi, S., and /Fermilab /LBL, Berkeley. Field quality measurements and abalysis of the LARP technology quadrupole models. United States: N. p., 2007. Web.
Bossert, R., Chlachidze, G., DiMarco, J., Kashikhin, V.V., Lamm, M., Schlabach, P., Tartaglia, M., Tompkins, J.C., Velev, G.V., Zlobin, A.V., Caspi, S., & /Fermilab /LBL, Berkeley. Field quality measurements and abalysis of the LARP technology quadrupole models. United States.
Bossert, R., Chlachidze, G., DiMarco, J., Kashikhin, V.V., Lamm, M., Schlabach, P., Tartaglia, M., Tompkins, J.C., Velev, G.V., Zlobin, A.V., Caspi, S., and /Fermilab /LBL, Berkeley. 2007. "Field quality measurements and abalysis of the LARP technology quadrupole models". United States. doi:. https://www.osti.gov/servlets/purl/924526.
@article{osti_924526,
title = {Field quality measurements and abalysis of the LARP technology quadrupole models},
author = {Bossert, R. and Chlachidze, G. and DiMarco, J. and Kashikhin, V.V. and Lamm, M. and Schlabach, P. and Tartaglia, M. and Tompkins, J.C. and Velev, G.V. and Zlobin, A.V. and Caspi, S. and /Fermilab /LBL, Berkeley},
abstractNote = {One of the US-LHC accelerator research program goals is to develop and prove the design and technology of Nb{sub 3}Sn quadrupoles for an upgrade of the LHC Interaction Region (IR) inner triplets. Four 1-m long technology quadrupole models with a 90 mm bore and field gradient of 200 T/m based on similar coils and different mechanical structures have been developed. In this paper, we present the field quality measurements of the first several models performed at room temperature as well as at superfluid helium temperature in a wide field range. The measured field harmonics are compared to the calculated ones. The field quality of Nb{sub 3}Sn quadrupole models is compared with the NbTi quadrupoles recently produced at Fermilab for the first generation LHC IRs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2007,
month = 8
}

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  • One of the US-LHC accelerator research program goals is to develop and prove the design and technology of Nb{sub 3}Sn quadrupoles for an upgrade of the LHC Interaction Region (IR) inner triplets. Four 1-m long technology quadrupole models with a 90 mm bore and field gradient of 200 T/m based on similar coils and different mechanical structures have been developed. In this paper, we present the field quality measurements of the first several models performed at room temperature as well as at superfluid helium temperature in a wide field range. The measured field harmonics are compared to the calculated ones.more » The field quality of Nb{sub 3}Sn quadrupole models is compared with the NbTi quadrupoles recently produced at Fermilab for the first generation LHC IRs.« less
  • After the successful test of the first long Nb{sub 3}Sn quadrupole magnet (LQS01), the US LHC Accelerator Research Program (LARP) has assembled and tested a new 3.7 m-long Nb{sub 3}Sn 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 alignmentmore » 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.« less
  • Test results are reported on TQS02a, a second model in support of the development of a large-aperture Nb{sub 3}Sn superconducting quadrupole for the US LHC Accelerator Research Program (LARP). The magnet uses key and bladder technology with supporting iron yoke and an aluminum shell. Changes from the previous first model (tested in 2006) include: (1) Titanium island poles; (2) no axial island gaps during reaction; and (3) RRP Nb3Sn conductor. Design changes resulted from previous tests with three different magnet assemblies (TQS01a, TQS01b and TQS01c) using coils with bronze segmented islands, with gaps and MJR conductor The paper summarizes themore » assembly, cool-down and performance of TQS01a, TQS01b, TQS01c, and TQS02 and compares measurements with design expectations.« less
  • The US-LHC accelerator research program (LARP) built and tested the first 3.7-m long Nb{sub 3}Sn quadrupole model of LQ series with a 90 mm bore diameter and a target field gradient of 200 T/m. The LQ series, developed in collaboration among FNAL, LBNL and BNL, is a scale up of the previously tested 1-m long technology quadrupoles of TQ series based on similar coils and two different mechanical structures (shell-based TQS and collar-based TQC), with a primary goal of demonstrating the Nb{sub 3}Sn accelerator magnet technology for the luminosity upgrade of LHC interaction regions. In this paper, we present themore » field quality measurements in the first 3.7-m long LQS01 model based on the modified TQS mechanical structure. The results are compared to the expectations from the magnet geometry and magnetic properties of coils and iron yoke. Moreover, we present a comparison between this magnet and the short models previously measured.« less