scispace - formally typeset
Search or ask a question
Author

M. Tartaglia

Bio: M. Tartaglia is an academic researcher from Fermilab. The author has contributed to research in topics: Superconducting magnet & Magnet. The author has an hindex of 9, co-authored 46 publications receiving 313 citations.

Papers
More filters
Journal ArticleDOI
TL;DR: The U.S. LHC Accelerator Research Program (LARP) and CERN combined their efforts in developing Nb3Sn magnets for the high-luminosity LHC upgrade.
Abstract: The U.S. LHC Accelerator Research Program (LARP) and CERN combined their efforts in developing Nb3Sn magnets for the high-luminosity LHC upgrade. The ultimate goal of this collaboration is to fabricate large aperture Nb 3Sn quadrupoles for the LHC interaction regions. These magnets will replace the present 70-mm-aperture NbTi quadrupole triplets for expected increase of the LHC peak luminosity up to 5 × 1034 cm –2s–1 or more. Over the past decade, LARP successfully fabricated and tested short and long models of 90 and 120-mm-aperture Nb3Sn quadrupoles. Recently, the first short model of 150-mm-diameter quadrupole MQXFS was built with coils fabricated both by LARP and CERN. The magnet performance was tested at Fermilab's vertical magnet test facility. This paper reports the test results, including the quench training at 1.9 K, ramp rate and temperature dependence, as well as protection heater studies.

37 citations

Proceedings ArticleDOI
12 May 1997
TL;DR: The Fermilab's superconducting magnet R&D program has built a facility to test magnets in a vertical dewar of superfluid liquid helium as mentioned in this paper, with a temperature range of 1.8 K to 4.4 K and 1 atmosphere helium.
Abstract: Future high energy accelerators such as the Large Hadron Collider require accelerator magnets with the highest possible fields. For NbTi conductor magnets, this means operating at superfluid helium temperatures in the range of 1.8-1.9 K. As part of Fermilab's superconducting magnet R&D program, we have built a facility to test magnets in a vertical dewar of superfluid liquid helium. The dewar is designed for magnets up to 4 m length and 620 mm diameter, with a temperature range of 1.8 K to 4.4 K and 1 atmosphere helium. The power system consists of 10 kA and 8.8 kA power supplies operating in parallel, with a bus work and an extraction circuit that can accommodate up a 18 kA excitation current. A description of the facility as well as operational experience from the first magnet tests are presented.

35 citations

Journal ArticleDOI
TL;DR: The first short 150 mm aperture quadrupole model MQXFS1 was assembled with coils fabricated by both CERN and LARP as discussed by the authors, and the magnet demonstrated a strong performance at Fermilab's vertical magnet test facility reaching the LHC operating limits.
Abstract: The development of Nb3Sn quadrupole magnets for the High-Luminosity LHC upgrade is a joint venture between the US LHC Accelerator Research Program (LARP)* and CERN with the goal of fabricating large aperture quadrupoles for the LHC interaction regions (IR). The inner triplet (low-β) NbTi quadrupoles in the IR will be replaced by the stronger Nb3Sn magnets boosting the LHC program of having 10-fold increase in integrated luminosity after the foreseen upgrades. Previously, LARP conducted successful tests of short and long models with up to 120 mm aperture. The first short 150 mm aperture quadrupole model MQXFS1 was assembled with coils fabricated by both CERN and LARP. The magnet demonstrated a strong performance at Fermilab's vertical magnet test facility reaching the LHC operating limits. This paper reports the latest results from MQXFS1 tests with changed prestress levels. The overall magnet performance, including quench training and memory, ramp rate, and temperature dependence, is also summarized.

29 citations

Journal ArticleDOI
TL;DR: In this article, a conceptual design for the magnetic system which meets the Fermilab Mu2e experiment requirements is presented, where the magnetic field requirements, the significant magnetic coupling between the solenoids, the curved muon transport geometry and the large beam induced energy deposition into the superconducting coils pose significant challenges to the magnetic, mechanical and thermal design of this system.
Abstract: The Fermilab Mu2e experiment seeks to measure the rare process of direct muon to electron conversion in the field of a nucleus. Key to the design of the experiment is a system of three superconducting solenoids; a muon production solenoid (PS) which is a 1.8 m aperture axially graded solenoid with a peak field of 5 T used to focus secondary pions and muons from a production target located in the solenoid aperture; an “S shaped” transport solenoid (TS) which selects and transports the subsequent muons towards a stopping target; a detector solenoid (DS) which is an axially graded solenoid at the upstream end to focus transported muons to a stopping target, and a spectrometer solenoid at the downstream end to accurately measure the momentum of the outgoing conversion electrons. The magnetic field requirements, the significant magnetic coupling between the solenoids, the curved muon transport geometry and the large beam induced energy deposition into the superconducting coils pose significant challenges to the magnetic, mechanical, and thermal design of this system. In this paper a conceptual design for the magnetic system which meets the Mu2e experiment requirements is presented.

20 citations

Journal ArticleDOI
TL;DR: In this paper, two short Nb/sub 3/Sn dipole models based on a single-bore cos-theta coil with a cold iron yoke were fabricated and tested at Fermilab.
Abstract: Two short Nb/sub 3/Sn dipole models based on a single-bore cos-theta coil with a cold iron yoke were fabricated and tested at Fermilab. This paper summarizes the details of magnet design and fabrication procedure, and reports the test results including quench performance and quench heater studies, and the magnetic measurements.

19 citations


Cited by
More filters
Journal ArticleDOI
TL;DR: In this article, the authors present the HL-LHC low-β quadrupole design, based on the experience gathered by the US LARP program, and describe the support structure components to preload the coils, withstand the electro-magnetic forces, provide alignment and LHe containment, and integrate the cold mass in the LHC IRs.
Abstract: The high luminosity LHC (HL-LHC) project is aimed at studying and implementing the necessary changes in the LHC to increase its luminosity by a factor of five. Among the magnets that will be upgraded are the 16 superconducting low-β quadrupoles placed around the two high luminosity interaction regions (ATLAS and CMS experiments). In the current baseline scenario, these quadrupole magnets will have to generate a gradient of 140 T/m in a coil aperture of 150 mm. The resulting conductor peak field of more than 12 T will require the use of Nb3Sn superconducting coils. We present in this paper the HL-LHC low-β quadrupole design, based on the experience gathered by the US LARP program, and, in particular, we describe the support structure components to pre-load the coils, withstand the electro-magnetic forces, provide alignment and LHe containment, and integrate the cold mass in the LHC IRs.

99 citations

Journal ArticleDOI
TL;DR: In this paper, a hybrid mechanical-static dc circuit breaker for quench protection of superconducting magnets based on a mechanical switch paralleled to a static circuit breaker is presented.
Abstract: This paper presents the development and testing of the prototype of a hybrid mechanical-static dc circuit breaker (CB) for quench protection of superconducting magnets based on a mechanical switch paralleled to a static CB. In normal operation, the mechanical switch is closed and it handles the continuous flow of dc current, minimizing the on-state losses. In case of intervention, the mechanical switch opens, commutating the current into the static CB that quickly interrupts and transfers the current into a discharge resistor, withstanding the reapplied voltage. This paper was carried out to face and solve some issues of this design solution being not available in the literature examples of similar applications rated for significant power levels. The operation of the hybrid CB has been successfully tested up to a current of 10 kA with a recovery voltage of about 1 kV. Special tests have been dedicated to characterize the reliability and the repeatability of the current commutation from the mechanical switch to the static CB and to characterize the arc voltage under different conditions.

68 citations

Journal ArticleDOI
TL;DR: Different from the unpredictable training performance of Nb-Ti and Nb3Sn magnets, these Bi-2212 magnets showed no training quenches and entered the flux flow state in a stable manner before thermal runaway and quench occurred, which make quench detection simple, enabling safe protection.
Abstract: High-temperature superconductors (HTS) could enable high-field magnets stronger than is possible with Nb-Ti and Nb3Sn, but two challenges have so far been the low engineering critical current density JE, especially in high-current cables, and the danger of quenches. Most HTS magnets made so far have been made out of REBCO coated conductor. Here we demonstrate stable, reliable and training-quench-free performance of Bi-2212 racetrack coils wound with a Rutherford cable fabricated from wires made with a new precursor powder. These round multifilamentary wires exhibited a record JE up to 950 A/mm2 at 30 T at 4.2 K. These coils carried up to 8.6 kA while generating 3.5 T at 4.2 K at a JE of 1020 A/mm2. Different from the unpredictable training performance of Nb-Ti and Nb3Sn magnets, these Bi-2212 magnets showed no training quenches and entered the flux flow state in a stable manner before thermal runaway and quench occurred. Also different from Nb-Ti, Nb3Sn, and REBCO magnets for which localized thermal runaways occur at unpredictable locations, the quenches of Bi-2212 magnets consistently occurred in the high field regions over a long conductor length. These characteristics make quench detection simple, enabling safe protection, and suggest a new paradigm of constructing quench-predictable superconducting magnets from Bi-2212.

57 citations

Journal ArticleDOI
TL;DR: Fermilab developed and investigated different high-field magnets (HFM) for present and future accelerators as discussed by the authors, including a series of 1-m long cos-theta dipole models based on the wind-and-react technique was fabricated and tested.
Abstract: Fermilab is developing and investigating different high-field magnets (HFM) for present and future accelerators. The HFM R&D program focused on the 10-12 T magnets based on Nb/sub 3/Sn superconductor and explored both basic magnet technologies for brittle superconductors-wind-and-react and react-and-wind. Magnet design studies in support of LHC upgrades and VLHC were conducted. A series of 1-m long cos-theta dipole models based on the wind-and-react technique was fabricated and tested. Three 1-m long flat racetracks and the common coil dipole model, based on a single-layer coil and react-and-wind technique, were also fabricated and tested. Extensive theoretical and experimental studies of electro-magnetic instabilities in Nb/sub 3/Sn strands, cables and magnets were performed and led to a successful 10 T dipole model. This paper presents the details of Fermilab's HFM program, reports its status and major results, and formulates the next steps for the program.

52 citations

Journal Article
TL;DR: In this paper, a large bore (120 mm) Nb 3 Sn quadrupole with 15 T peak coil field was developed within the framework of the US LHC Accelerator Research Program (LARP) with a 15 mm wide cable.
Abstract: Design of HQ – a High Field Large Bore Nb 3 Sn Quadrupole Magnet for LARP H Felice, G Ambrosio, M Anerella, R Bossert, S Caspi, D Cheng, D Dietderich, P Ferracin, A K Ghosh, R Hafalia, C R Hannaford, V Kashikhin, J Schmalze, S Prestemon, GL Sabbi, PWanderer, AV Zlobin Abstract— In support of the Large Hadron Collider luminosity upgrade, a large bore (120 mm) Nb 3 Sn quadrupole with 15 T peak coil field is being developed within the framework of the US LHC Accelerator Research Program (LARP) The 2-layer design with a 15 mm wide cable is aimed at pre-stress control, alignment and field quality while exploring the magnet performance limits in terms of gradient, forces and stresses In addition, HQ will determine the magnetic, mechanical, and thermal margins of Nb 3 Sn technology with respect to the requirements of the luminosity upgrade at the LHC Index Terms— Superconducting accelerator magnets, Nb 3 Sn, IR quadrupole, LARP IR quadrupole magnets using NbTi This intermediate LHC upgrade and the ongoing development on HQ give a good opportunity to compare the performances of NbTi and Nb 3 Sn large aperture quads In order to match the CERN NbTi quads aperture, the aperture of HQ will be 120 mm [7], [8] The 2D magnetic design along with some preliminary results on the 3D magnetic design is summarized in this paper In the last part, the mechanical structure implementing alignment features is presented II M AGNETIC D ESIGN A Conductor The objectives of HQ are to reach 15 T peak field in the conductor and 200 T/m in a 120 mm aperture A wide cable was selected to achieve this goal in a 2-layer cos2θ quadrupole and to manage the mechanical stresses in the coil In addition, CERN plans to use the 151 mm wide LHC main dipole cable to fabricate the Phase 1 IR NbTi quadrupole magnets [9], [10] In order to facilitate the comparison between NbTi and Nb 3 Sn quads, the cable width of HQ was chosen to match that of the dipole cable, 1515 mm The present conductor parameters are described in Table I Due to the large size of the cable and its keystone angle, prototype cables were fabricated The cables have been evaluated for their windability and if any strand damage occurred during cabling TABLE I HQ D ESIGN P ARAMETERS Parameters Strand diameter Strand type Cu/non-Cu ratio Number strands Cable width (bare) Cable mid-thickness (bare) mm mm deg µm Units mm HQ design OST RRP 54/61 [11] I INTRODUCTION the LHC baseline luminosity requires IR quadrupoles with large aperture and high gradients The main objective of LARP is to demonstrate the feasibility of Nb 3 Sn technology for the LHC Phase 2 upgrade Toward this goal, LARP has developed several series of Nb 3 Sn magnets: the SQ series (Subscale Quadrupole) [1], [2], the TQ series (1- meter long 90 mm aperture Technology Quadrupole) [3], [4] and the LRS series (36-meter Long Racetrack assembled in a common coil arrangement) [5] The LQ series (Long Quadrupole) is under construction and is a 37 long version of the TQ series aiming at demonstrating the scalability of Nb 3 Sn cosine two theta quadrupole [6] In order to meet the requirements for Phase 2 LHC upgrade, the next series of magnet will have to be designed to reach 15 T at 19 K in a large aperture (above 110 mm) with alignment features (to provide field quality), cooling channels and LHe containment The objective of the LARP HQ series (1-meter long High gradient, high field Quadrupole) is to address these requirements With the Phase 1 LHC upgrade, CERN is going to fabricate PGRADING U Manuscript received 26 August 2008 This work was supported in part by the Director, Office of Energy Research, Office of High Energy and Nuclear Physics, High Energy Physics Division, US Department of Energy, under contract No DE-AC02-05CH11231 HFelice, S Caspi, D Dietderich, D Cheng, P Ferracin, R Hafalia, CR Hannaford, S Prestemon and GL Sabbi are with Lawrence Berkeley National Laboratory, Berkeley, CA 94720 USA (e-mail: HFelice@lblgov) G Ambrosio, R Bossert, V Kashiskhin and AZlobin are with Fermilab National Accelerator Laboratory, Batatvia, IL 60510-0500 USA M Anerella, A K Ghosh, J Schmalze and P Wanderer are with Brookhaven National Laboratory, NY, USA Keystone angle Insulation thickness Nb of turns IL/OL Several prototype cables have been fabricated with different thickness and keystone angles and each cable's behavior was characterized by winding tests around various pole

49 citations