Magnetic Field Data on Fermilab Energy Saver Quadrupoles
TL;DR: The Fermilab Energy Saver/Doubler (Tevatron) accelerator contains 216 superconducting quadrupole magnets before installation in the Tevatron ring.
Abstract: The Fermilab Energy Saver/Doubler (Tevatron) accelerator contains 216 superconducting quadrupole magnets Before installation in the Tevatron ring, these magnets plus an additional number of spares were extensively tested at the Fermilab Magnet Test Facility (MTF) Details on the results of the tests are presented here
Citations
More filters
CERN1
TL;DR: In this paper, the problems encountered and solved at the Tevatron are described and used as an introduction to the many challenges posed by the use of superconducting magnet technology.
Abstract: Superconducting magnets have played a key role in advancing the energy reach of proton synchrotrons and enabling them to play a major role in defining the Standard Model. The problems encountered and solved at the Tevatron are described and used as an introduction to the many challenges posed by the use of this technology. The LHC is being prepared to answer the many questions beyond the Standard Model and in itself is at the cutting edge of technology. A description of its magnets and their properties is given to illustrate the advances that have been made in the use of superconducting magnets over the past 30 years.
29 citations
TL;DR: The measurement system and procedures used to test more than 900 superconducting dipole magnets and more than 275 superconducted quadrupole magnets for the Fermilab Energy Saver are described in this article.
Abstract: The measurement system and procedures used to test more than 900 superconducting dipole magnets and more than 275 superconducting quadrupole magnets for the Fermilab Energy Saver are described. The system is designed to measure nearly all parameters relevant to the use of the magnets in the accelerator including maximum field capability and precision field measurements. The performance of the instrumentation with regard to precision, reliability, and operational needs for high volume testing will be described. Previous reports have described the measurement system used during development of the Saver magnets from which this system has evolved.
11 citations
Dissertation•
05 Nov 2009
TL;DR: In this paper, a methode analytique basee sur les equations analytiques du champ magnetique is proposed, which is based on the decomposition en serie de Fourier du Courant and permettant d'estimer l'energie avec a precision de 10 %.
Abstract: Le travail effectue dans cette these a pour theme central la conception d’un aimant quadripolaire supraconducteur en Nb-Ti destine a remplacer a l’horizon 2014 les aimants d’insertions actuellement utilises dans le grand collisionneur de Hadrons (LHC) du CERN de Geneve. Ce nouveau quadripole, caracterise par un diametre d’ouverture encore jamais atteint (120 mm), ouvre la voie vers les quadripoles a grandes ouvertures. Tout d’abord, pour rapidement estimer l’energie magnetique stockee dans un quadripole de type cos2?, une formule analytique basee sur la decomposition en serie de Fourier du courant et permettant d’estimer l’energie avec une precision de 10 % est developpee. Le design magnetique de la section transverse de la bobine du quadripole est ensuite realise en utilisant une nouvelle methode d’optimisation basee sur les equations analytiques du champ magnetique. Puis, pour la premiere fois, une estimation de la reproductibilite dans le positionnement des blocs de conducteurs dans des aimants Nb3Sn est faite. Elle a ete realisee a l’aide d’une methode existante et grâce a la production recente de deux series d’aimants Nb3Sn. Une comparaison avec les valeurs obtenues pour des aimants en Nb-Ti est presentee. Ensuite, une methode analytique basee sur les statistiques et permettant d’expliquer certains phenomenes observes sur la dispersion des mesures magnetiques dans une serie de quadripoles est developpee. Enfin, on montre que l’incertitude sur la moyenne des harmoniques de champ est due pour la majorite des harmoniques a un phenomene statistique lie au nombre limite d’aimants dans la serie et non a des erreurs systematiques
5 citations
06 May 1991
TL;DR: For the Fermilab Tevatron low beta insertions installed in 1990-1 as part of a luminosity upgrade, approximately 35 superconducting cold iron quadrupoles were built utilizing a two-layer cos 2 theta coil geometry with a 76mm-diameter.
Abstract: For the Fermilab Tevatron low beta insertions installed in 1990-1 as part of a luminosity upgrade, approximately 35 superconducting cold iron quadrupoles were built utilizing a two-layer cos 2 theta coil geometry with a 76-mm-diameter. The field harmonics and strengths of these magnets, determined by measurement at cryogenic conditions, are presented. Evidence for a longitudinal periodic structure in the remanence field is shown. >
3 citations
TL;DR: In this paper, the quench and field properties of Energy Saver dipole and quadrupole magnets are measured at the Fermilab Magnet Test Facility shortly after the magnets have been produced.
Abstract: The quench and field properties of Energy Saver dipole and quadrupole magnets are measured at the Fermilab Magnet Test Facility shortly after the magnets have been produced. It is important that magnet properties remain unchanged with time. This question has been investigated by remeasuring magnets at a later time and comparing the two sets of measurements. Three sets of unbiased data are available: 1) Fifteen dipole magnets were remeasured after they were removed from the "B12" cryoloop test location. At B12, they were subjected to repeated thermal cycles, quenches at high current, steady state operation at high current, and ramping to high current with an accelerator type ramp cycle. The average time between the original measurement and the remeasurement was 22 months. 2) Five standard length (66 inch) quadrupole magnets were remeasured after an elapsed time averaging 5 months. These magnets were in storage during the period between the two sets of measurements. 3) Six long (99 inch) quadrupole magnets were remeasured after an average time of 12 days. These were also in storage. The remeasurements agree well with the original measurements. The measurement techniques and magnet properties obtained from the full magnet samples are described elsewhere.
2 citations
References
More filters
TL;DR: In this article, the authors present magnetic field data from Fermilab's production line for the fabrication of 901 21 foot long superconducting dipoles for use in the Energy Saver/Doubler, showing that the mechanical design permits substantial reduction of the magnitudes of the normal and skew quadrupole harmonic coefficients.
Abstract: At Fermilab we have operated a production line for the fabrication of 901 21 foot long superconducting dipoles for use in the Energy Saver/Doubler. At any one time 772 of these dipoles are installed in the accelerator and 62 in beamlines; the remainder are spares. Magnetic field data are now available for most of these dipoles; in this paper we present some of these data which show that we have been able to maintain the necessary consistency in field quality throughout the production process. Specifically we report harmonic field coefficients, showing that the mechanical design permits substantial reduction of the magnitudes of the normal and skew quadrupole harmonic coefficients; field shape profiles; integral field data; and field angle data. Details of the measurement apparatus and procedures are described elsewhere.
26 citations
TL;DR: The measurement system and procedures used to test more than 900 superconducting dipole magnets and more than 275 superconducted quadrupole magnets for the Fermilab Energy Saver are described in this article.
Abstract: The measurement system and procedures used to test more than 900 superconducting dipole magnets and more than 275 superconducting quadrupole magnets for the Fermilab Energy Saver are described. The system is designed to measure nearly all parameters relevant to the use of the magnets in the accelerator including maximum field capability and precision field measurements. The performance of the instrumentation with regard to precision, reliability, and operational needs for high volume testing will be described. Previous reports have described the measurement system used during development of the Saver magnets from which this system has evolved.
11 citations
TL;DR: In this article, the design, construction, and performance tests of Energy Saver/Doubler quadrupoles are presented along with recent data from the test of a special high gradient low beta prototype quadrupole.
Abstract: Details on the design, construction, and performance tests of Energy Saver/Doubler quadrupoles are presented along with recent data from the test of a special high gradient low beta prototype quadrupole.
8 citations
TL;DR: In this paper, the multipole structure of Fermilab Energy Saver quadrupoles is obtained from low current, room temperature measurements using a rotational Morgan coil and lock-in amplifier.
Abstract: The multipole structure of Fermilab Energy Saver quadrupoles is obtained from low current, room temperature measurements using a rotational Morgan coil and lock-in amplifier. Multipole data are presented for the first forty Tevatron quadrupoles.
5 citations
TL;DR: In this paper, the authors describe and present the statistical results of the maximum field tests (including quench and cycle) on Saver dipole and quadrupole magnets and explore the correlation of these tests with cable critical current.
Abstract: At an energy of 1 TeV the superconducting cable in the Energy Saver dipole magnets will be operating at ca. 96% of its nominal short sample limit; the corresponding number in the quadrupole magnets will be 81%. All magnets for the Saver are individually tested for maximum current capability under two modes of operation; some 900 dipoles and 275 quadrupoles have now been measured. The dipole winding is composed of four individually wound coils which in general come from four different reels of cable. As part of the magnet fabrication quality control a short piece of cable from both ends of each reel has its critical current measured at 5T and 4.3K. In this paper the authors describe and present the statistical results of the maximum field tests (including quench and cycle) on Saver dipole and quadrupole magnets and explore the correlation of these tests with cable critical current.
5 citations