skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Measurements of Dynamic Effects in FNAL 11 T Nb 3Sn Dipole Models

Abstract

Fermilab, in collaboration with CERN, has developed a twin-aperture 11 T Nb 3Sn dipole suitable for the high-luminosity LHC upgrade. During 2012-2014, a 2-m long single-aperture dipole demonstrator and three 1-m long single-aperture dipole models were fabricated by FNAL and tested at its Vertical Magnet Test Facility. Collared coils from two of the 1-m long models were then used to assemble the first twin-aperture dipole demonstrator. This magnet had extensive testing in 2015-2016, including quench performance, quench protection, and field quality studies. Here, this paper reports the results of measurements of persistent current effects in the single-aperture and twin-aperture 11 T Nb 3Sn dipoles and compares them with similar measurements in previous NbTi magnets

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1]
  1. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1408208
Report Number(s):
FERMILAB-CONF-17-341-TD
Journal ID: ISSN 1051-8223; 1635146
Grant/Contract Number:
AC02-07CH11359
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
IEEE Transactions on Applied Superconductivity
Additional Journal Information:
Journal Volume: PP; Journal Issue: 99; Conference: 25th International Conference on Magnet Technology, Amsterdam (Netherlands), 27 Aug - 1 Sep 2017; Journal ID: ISSN 1051-8223
Publisher:
Institute of Electrical and Electronics Engineers (IEEE)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; Accelerator Magnets; Decay and Snap-back; Persistent Currents; Superconducting Magnets

Citation Formats

Velev, Gueorgui, Strauss, Thomas, Barzi, Emanuela, Chlachidze, Guram, DiMarco, Joseph, Nobrega, Alfred, Novitski, Igor, Stoynev, Stoyan Emilov, Turrioni, Daniele, and Zlobin, Alexander. Measurements of Dynamic Effects in FNAL 11 T Nb3Sn Dipole Models. United States: N. p., 2018. Web. doi:10.1109/TASC.2018.2791957.
Velev, Gueorgui, Strauss, Thomas, Barzi, Emanuela, Chlachidze, Guram, DiMarco, Joseph, Nobrega, Alfred, Novitski, Igor, Stoynev, Stoyan Emilov, Turrioni, Daniele, & Zlobin, Alexander. Measurements of Dynamic Effects in FNAL 11 T Nb3Sn Dipole Models. United States. doi:10.1109/TASC.2018.2791957.
Velev, Gueorgui, Strauss, Thomas, Barzi, Emanuela, Chlachidze, Guram, DiMarco, Joseph, Nobrega, Alfred, Novitski, Igor, Stoynev, Stoyan Emilov, Turrioni, Daniele, and Zlobin, Alexander. 2018. "Measurements of Dynamic Effects in FNAL 11 T Nb3Sn Dipole Models". United States. doi:10.1109/TASC.2018.2791957.
@article{osti_1408208,
title = {Measurements of Dynamic Effects in FNAL 11 T Nb3Sn Dipole Models},
author = {Velev, Gueorgui and Strauss, Thomas and Barzi, Emanuela and Chlachidze, Guram and DiMarco, Joseph and Nobrega, Alfred and Novitski, Igor and Stoynev, Stoyan Emilov and Turrioni, Daniele and Zlobin, Alexander},
abstractNote = {Fermilab, in collaboration with CERN, has developed a twin-aperture 11 T Nb3Sn dipole suitable for the high-luminosity LHC upgrade. During 2012-2014, a 2-m long single-aperture dipole demonstrator and three 1-m long single-aperture dipole models were fabricated by FNAL and tested at its Vertical Magnet Test Facility. Collared coils from two of the 1-m long models were then used to assemble the first twin-aperture dipole demonstrator. This magnet had extensive testing in 2015-2016, including quench performance, quench protection, and field quality studies. Here, this paper reports the results of measurements of persistent current effects in the single-aperture and twin-aperture 11 T Nb3Sn dipoles and compares them with similar measurements in previous NbTi magnets},
doi = {10.1109/TASC.2018.2791957},
journal = {IEEE Transactions on Applied Superconductivity},
number = 99,
volume = PP,
place = {United States},
year = 2018,
month = 1
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on January 17, 2019
Publisher's Version of Record

Save / Share:
  • We investigate the effect of the dipole-dipole interaction on the dynamic properties and the atomic coherent trapping of a two-identical-atom system in the presence of a laser field by means of quantum-electrodynamics theory. The influence of the dipole-dipole interaction on the collapses and revivals of the atomic population is revealed. The conditions of the atomic coherent trapping are given. A way to measure optically the coupling strength between the atoms is pointed out. We also show that the effect of the dipole-dipole interaction may be screened due to the coherent field in certain atomic superposition states.
  • A 2 m long single-aperture dipole demonstrator and two 1 m long single-aperture models based on Nb 3Sn superconductor have been built and tested at FNAL. The two 1 m long collared coils were then assembled in a twin-aperture Nb 3Sn dipole demonstrator compatible with the LHC main dipole and tested in two thermal cycles. This paper summarizes the quench performance of the FNAL twin-aperture Nb 3Sn 11 T dipole in the temperature range of 1.9-4.5 K. The results of magnetic measurements for one of the two apertures are also presented. Test results are compared to the performance of coilsmore » in a single-aperture configuration. Lastly, a summary of quench propagation studies in both apertures is given.« less
  • Fermi National Accelerator Laboratory (FNAL) is developing optical transition radiation (OTR) detectors for beam diagnostics for their 120-GeV proton and antiproton transfer lines. As part of a collaboration to enhance the luminosity for the FNAL collider RUN II program, the quality of the proton and antiproton beams, as they are transported from the main injector (MI) to the Tevatron, will be characterized using OTR imaging techniques. A prototype detector in air has already successfully acquired OTR images of 120-GeV protons upstream of the antiproton production target. This result demonstrates that (i) the Ti and Al thin foil screens survive themore » 5 x 1012 proton beam spills, (ii) OTR is sufficient to image lower intensity antiproton beams, and (iii) the images provide two-dimensional information and higher resolution than the present multi-wire profile monitors in the transport lines. Beam bombardment effects on the Al screen and radiation effects on the lenses, filters and cameras have been evaluated for the prototype system for over 1 x 1019 120-GeV protons and will also be presented. An in-vacuum OTR station is being designed for the transport lines with adjustments to the optical components as warranted by the beam characteristics and anticipated radiation environment.« less
  • Fermilab has developed standard optical transition radiation (OTR) detectors as part of its Run II upgrade program for measuring intense proton and antiproton beams. These detectors utilize radiation-hardened CID cameras to image the OTR and produce high-resolution two-dimensional beam profiles. One of these detectors has been installed in the Tevatron next to the new ionization profile monitor (IPM). Initial OTR measurements are presented for 150 GeV injected coalesced and uncoalesced proton bunches. OTR images are taken for one-turn and two-turn injections over an intensity range of 1.5e11 to 3.5e11 protons. Preliminary profile measurements give uncoalesced beam size sigmas of 1.0more » mm horizontally by 0.7 mm vertically and coalesced beam size sigmas of 1.8 mm horizontally by 0.7 mm vertically. OTR images are also presented for changes in the Tevatron skew quadrupole magnet currents, which produce a rotation to the OTR image, and for changes to the Tevatron RF, which can be used to measure single-turn dispersion. Operational aspects of this detector for beam studies and Tevatron tune-up are also discussed.« less