Marcos Turqueti - Academia.edu (original) (raw)

Papers by Marcos Turqueti

Superconductor science and technology/Superconductor science & technology, Apr 29, 2024

Acoustic arrays are currently utilized in many different applications, ranging from consumer elec... more Acoustic arrays are currently utilized in many different applications, ranging from consumer electronics to military systems. Active research on sensors, hardware, algorithms, and system integration specific to acoustic arrays are ongoing on a wide range of engineering fields. Applications such as sound source separation, sound navigation, sound imaging, and speech recognition are few of the many possible applications that benefit

APS April Meeting Abstracts, 2018

Mechanical disturbances in radiation detectors can cause microphonic noise and reduce energy reso... more Mechanical disturbances in radiation detectors can cause microphonic noise and reduce energy resolution. Recently, we have proposed a system to cancel the microphonic noise using real-time adaptive modeling. In this paper we are reporting an FPGA implementation of such algorithm. We have concluded that, because the operations of the algorithm are done using a decimated sampling rate, it uses minimum resources inside the FPGA.

Nuclear Instruments and Methods in Physics Research, Sep 1, 2007

The CMS Forward Pixel Tracker will consist of two end-cap blocks, each made of two disks lodging ... more The CMS Forward Pixel Tracker will consist of two end-cap blocks, each made of two disks lodging sensors and Read-Out Chips (ROCs) (grouped into plaquettes of different sizes) for a total of about 18 million read-out channels. During the assembly phase, prior to the physical mounting of the plaquettes on the disks a thorough electronic test is necessary to check each channel for functionality, noise level, required threshold trimming and bump-bond quality. To this extent a complete test-stand system, based on custom PCI cards and specialized software, has been developed. Different methods have been evaluated and implemented to electronically assess the amount of malfunctioning bump-bonds. Determination of the correct parameters for initialization of the ROCs has also been implemented as an automatic procedure; data are finally fed into a centralized database for subsequent retrieval during detector initialization or for off-line analysis. In this paper we describe requirements, design and implementation of such a system, which is currently in use at the Silicon Detector Facility (SiDet) Laboratory of FNAL for the final assembly of the Forward Tracker system.

IEEE conference record, Oct 1, 2007

The International Linear Accelerator (ILC) is the currently proposed electron-positron linear col... more The International Linear Accelerator (ILC) is the currently proposed electron-positron linear collider to complement the proton-proton Large Hadron Collider (LHC) located at CERN. One of the main problems foreseen for the ILC detectors is the need for a low material budged on the interaction region. Also, due to its foreseen high density electronics on the tracker, a more efficient way

Nuclear Instruments and Methods in Physics Research, Mar 1, 2016

An all silicon pixel telescope has been assembled and used at the Fermilab Test Beam Facility (FT... more An all silicon pixel telescope has been assembled and used at the Fermilab Test Beam Facility (FTBF) for the last four years to provide precise tracking information for different test beam experiments with a wide range of Detectors Under Test (DUTs) requiring high resolution measurement of the track impact point. The telescope is based on CMS pixel modules left over from the CMS forward pixel production. Eight planes are arranged to achieve a resolution of less than 6 μm on the beam transverse coordinate at the DUT position. In order to achieve such resolution with 100 x 150 μm 2 pixel cells, the planes were tilted to 25 degrees to maximize charge sharing between pixels. Crucial for obtaining this performance is the alignment software, called Monicelli, specifically designed and optimized for this system. This paper will describe the telescope hardware, the data acquisition system and the alignment software constituting this particle tracking system for test beam users.

IEEE Transactions on Nuclear Science, Feb 1, 2006

High energy and nuclear physics experiments need tracking devices with excellent spatial precisio... more High energy and nuclear physics experiments need tracking devices with excellent spatial precision and readout speed in the face of ever-higher track densities and increased radiation environments. The new generation of hybrid pixel detectors (arrays of silicon diodes bump bonded to arrays of front-end electronic cells) is a technology able to meet these challenges. We report the first results of the BTeV silicon pixel detector beam test carried out at Fermilab in summer 2004. Tests were performed using a 120 GeV/c proton beam incident on a 6 planes pixel detector telescope. The last prototype developed for the BTeV experiment (FPIX2) is tested in the middle of the telescope. There is no external trigger and events were built using the time-stamp information provided by the readout chips.

Scientific Reports, Jul 15, 2019

High-temperature superconductors (HTS) could enable high-field magnets stronger than is possible ... more High-temperature superconductors (HTS) could enable high-field magnets stronger than is possible with Nb-Ti and Nb 3 Sn, but two challenges have so far been the low engineering critical current density J e , 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-quenchfree 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 J e up to 950 A/ mm 2 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 J e of 1020 A/ mm 2. Different from the unpredictable training performance of Nb-Ti and Nb 3 Sn 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, Nb 3 Sn, 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.

2021 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC), Oct 16, 2021

Existing measurement methods and limitations 3 Two existing technologies-• Hall probe: ○ Widely u... more Existing measurement methods and limitations 3 Two existing technologies-• Hall probe: ○ Widely used for local field mapping and are the sensor of the choice for most magnetic characterizations. ○ Have limitations such as DC offset, nonlinearity, temperature drift, sensor aging, and the planar Hall effect. ○ Their long-term gain and offset drift with time and temperature, requiring frequent re-calibrations. • Single Stretched Wire: ○ This method is used for straight geometries and is not generally suited for local magnetic field measurements. • Nuclear Magnetic Resonance: ○ This method of magnetic measurement is accurate for the main field but is seen to be unsuitable for field gradient measurements.

OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information), Oct 1, 2005

Superconductor Science and Technology, Dec 7, 2020

Although the high-temperature superconducting (HTS) REBa 2 Cu 3 O x (REBCO, RE = rare earth eleme... more Although the high-temperature superconducting (HTS) REBa 2 Cu 3 O x (REBCO, RE = rare earth elements) material has a strong potential to enable dipole magnetic fields above 20 T in future circular particle colliders, the magnet and conductor technology needs to be developed. As part of an ongoing development to address this need, here we report on our CORC ® canted cos θ magnet called C2 with a target dipole field of 3 T in a 65 mm aperture. The magnet was wound with 70 m of 3.8 mm diameter CORC ® wire on machined metal mandrels. The wire had 30 commercial REBCO tapes from SuperPower Inc., each 2 mm wide with a 30 µm thick substrate. The magnet generated a peak dipole field of 2.91 T at 6.290 kA, 4.2 K. The magnet could be consistently driven into the flux-flow regime with reproducible voltage rise at an engineering current density between 400-550 A mm −2 , allowing reliable quench detection and magnet protection. The C2 magnet represents another successful step towards the development of high-field accelerator magnet and CORC ® conductor technologies. The test results highlighted two development needs: continue improving the performance and flexibility of CORC ® wires and develop the capability to identify locations of first onset of flux-flow voltage.

The need for data acquisition and controls operating at deep cryogenic temperatures has become pr... more The need for data acquisition and controls operating at deep cryogenic temperatures has become pronounced with the large number of nuclear and high energy physics detectors that are currently running at cryogenic temperatures. At LBNL we have built a FPGA based n-bit Analog to Digital Converter (ADC) for operation at deep cryogenic temperatures (4.2K). This novel device is currently under test and has been evaluated both at cryogenic and room temperatures. Both nuclear and high energy physics experiments running at cryogenic temperatures can greatly benefit from this new development.

2003 IEEE Nuclear Science Symposium. Conference Record (IEEE Cat. No.03CH37515), 2003

The pixel detector proposed for the BTeV experiment at the Fermilab Tevatron will use bump-bondin... more The pixel detector proposed for the BTeV experiment at the Fermilab Tevatron will use bump-bonding technology based on either Indium or Pb/Sn solder to connect the front-end readout chips to the silicon pixel sensors. We have studied the strength of the bumps by visual inspection of the bumps bonding silicon sensor modules to dummy chips made out of glass. The studies were done before and after thermal cycles, exposed to intense irradiation, and with the assemblies glued to a graphite substrate. We have also carried out studies on effects of temperature changes on both types of bump bonds by observing the responses of single-chip pixel detectors to an Sr 90 source. We report the results from these studies and our plan to measure the effect of cryogenic temperatures on the bumps. 5. No loss in strength and connectivity after irradiation We have previously reported large-scale tests of the yield using both indium and Pb/Sn solder bumps [1]. The conclusion is that both seem to be viable for pixel detectors. We have also carried out studies of various effects (e.g. storage over long period, effect of heating and cooling, and radiation) on both types of bump bonds using daisy-chained parts on a small scale [2]. Overall, these tests showed little changes in the integrity of the bump connections. Nevertheless, questions still remain on the long-term reliability of the bumps due to thermal cycle effects, attachment to a substrate with a different coefficient of thermal expansion (CTE), and radiation.

$Research paper thumbnail of Test of the High-Field <math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><msub><mrow><mtext>Nb</mtext></mrow><mn>3</mn></msub><mrow><mtext>Sn</mtext></mrow></mrow><annotation encoding="application/x-tex">\hbox{Nb}_{3}\hbox{Sn}</annotation></semantics></math>Nb3Sn Dipole Magnet HD3b$

IEEE Transactions on Applied Superconductivity, Jun 1, 2014

ABSTRACT We report test results for the one meter long dipole HD3b, a block-type accelerator qual... more ABSTRACT We report test results for the one meter long dipole HD3b, a block-type accelerator quality Nb3Sn magnet built at LBNL with operational bore fields in the range of 13-15 T. The magnet is an upgrade of the previously reported HD2 and HD3a versions, with several modifications implemented to improve conductor positioning, reduce cable “hard-way” bending radius, and strengthen electrical insulation between cables and coil parts. The magnet exhibited long training behavior, but showed a good “memory” of the trained state upon thermal cycling. Ramp-rate dependence of the quench current, field quality performance characteristics, and protection heater studies were conducted. Quench propagation velocity and quench locations were determined based on the voltage signals; quench localization was further improved using inductive quench antenna and acoustic emission sensors. Short- and long-term acoustic precursors to quenching were observed.

IEEE Transactions on Applied Superconductivity, Jun 1, 2016

Protection heaters are essential elements of a quench protection scheme for LARP high-field accel... more Protection heaters are essential elements of a quench protection scheme for LARP high-field accelerator magnets. Various heater designs fabricated by LARP and CERN have already been tested in the LARP high-field quadrupole HQ, and presently being built into the coils of high-field quadrupole MQXF. In order to compare heat flow characteristics and thermal diffusion timescales of different heater designs, we powered heaters of two different geometries in ambient conditions and imaged resulting thermal distributions using a high-sensitivity thermal video camera. We observed peculiar spatial periodicity in the temperature distribution maps potentially linked to the structure of the underlying cable. 2D numerical simulation of heat diffusion and spatial heat distribution have been conducted, and results of the simulation and experiment have been compared. Imaging revealed hot spots formed due to a current concentration around high curvature points of heater strip of varying crosssection, and visualized thermal effects of various inter-layer structural defects. Thermal imaging can become a future quality control tool for the MQXF coil heaters.

The Front-End R&D group at Fermilab has been developing pixel hybridized modules and silicon stri... more The Front-End R&D group at Fermilab has been developing pixel hybridized modules and silicon strip detectors for the past decade for high-energy physics experiments. To accomplish this goal, one of the activities the group has been working on includes the development of a flexible high-speed and high-bandwidth data acquisition and test system to characterize front-end electronics. In this paper, we present a general purpose PCI-based test stand system developed to meet the stringent requirements of testing silicon strip and pixel detectors. The test stand is based on a platform that is flexible enough to be adapted to different types of front-end electronics. This system has been used to test the performance of the electronics for different experiments such as BTeV, CDF, CMS, and Phenix. The paper presents the capabilities of the system and how it can be adapted to meet the testing requirements of different applications.