358 research outputs found
Magnesium Diboride Flexible Flat Cables for Cryogenic Electronics
Magnesium diboride (MgB2) thin films are a potential alternative to
low-temperature superconductors (LTS) due to a higher critical temperature (Tc)
of approximately 39 K. The reactive evaporation deposition technique also
affords relatively simple growth of MgB2 films on flexible substrates compared
to high-temperature superconductors (HTS). We have designed and fabricated a
cable architecture consisting of MgB2 traces on flexible yttria-stabilized
zirconia (YSZ) compatible with commercially available connectors or direct
wirebonds. Key performance metrics such as critical current density (Jc) and Tc
are measured and compared. We discuss thermal conductivity and passivation
schemes for these cables.Comment: 4 pages with 4 figures. Presented at ASC 2010 - submitted to IEEE
Transactions on Superconductivit
Ionization Electron Signal Processing in Single Phase LArTPCs II. Data/Simulation Comparison and Performance in MicroBooNE
The single-phase liquid argon time projection chamber (LArTPC) provides a
large amount of detailed information in the form of fine-grained drifted
ionization charge from particle traces. To fully utilize this information, the
deposited charge must be accurately extracted from the raw digitized waveforms
via a robust signal processing chain. Enabled by the ultra-low noise levels
associated with cryogenic electronics in the MicroBooNE detector, the precise
extraction of ionization charge from the induction wire planes in a
single-phase LArTPC is qualitatively demonstrated on MicroBooNE data with event
display images, and quantitatively demonstrated via waveform-level and
track-level metrics. Improved performance of induction plane calorimetry is
demonstrated through the agreement of extracted ionization charge measurements
across different wire planes for various event topologies. In addition to the
comprehensive waveform-level comparison of data and simulation, a calibration
of the cryogenic electronics response is presented and solutions to various
MicroBooNE-specific TPC issues are discussed. This work presents an important
improvement in LArTPC signal processing, the foundation of reconstruction and
therefore physics analyses in MicroBooNE.Comment: 54 pages, 36 figures; the first part of this work can be found at
arXiv:1802.0870
Multiplexed extrinsic silicon detector array
Multiplexed extrinsic silicon detector arrays for infrared applications were developed and tested. Cryogenic electronics are discussed. Ambient temperature electronics are also discussed
Reliability of Electronics for Cryogenic Space Applications Being Assessed
Many future NASA missions will require electronic parts and circuits that can operate reliably and efficiently in extreme temperature environments below typical device specification temperatures. These missions include the Mars Exploration Laboratory, the James Webb Space Telescope, the Europa Orbiter, surface rovers, and deep-space probes. In addition to NASA, the aerospace and commercial sectors require cryogenic electronics in applications that include advanced satellites, military hardware, medical instrumentation, magnetic levitation, superconducting energy management and distribution, particle confinement and acceleration, and arctic missions. Besides surviving hostile space environments, electronics capable of low-temperature operation would enhance circuit performance, improve system reliability, extend lifetime, and reduce development and launch costs. In addition, cryogenic electronics are expected to result in more efficient systems than those at room temperature
Integrated cryogenic electronics to readout large areas SiPMs
L'abstract è presente nell'allegato / the abstract is in the attachmen
Cryogenic Electronics in Support of Deep-Space Missions
NASA Lewis Research Center is developing the enabling technologies for a cryogenic power system in conjunction with the NASA Jet Propulsion Laboratory (JPL) and universities. In addition, creative processes that could expand industrial participation in this program are being explored, such as the Small Business Innovation Research Program
Status and New Ideas Regarding Liquid Argon Detectors
Large (up to kt) liquid argon time-projection chamber detectors
are presently being considered for proton decay searches and neutrino
astrophysics, as well as for far detectors for the next generation of
long-baseline neutrino oscillation experiments that aim to determine neutrino
mass hierarchy and search for CP violation in the leptonic sector. These
detectors rely on the capabilities to assemble large volumes of LAr in
ultrahigh-purity conditions, possibly in an underground environment, and to
achieve relatively long drifts for the ionization charge. Several proposals
have been developed, each of which takes a different approach to the design of
the cryogenic vessels and has different scales of modularity to reach the final
mass dictated by physics. New detector concepts, with innovative designs of
readout electronics and novel methods for the readout of the ionization charge
and scintillation light, have been proposed.Comment: accepted for publication by Ann. Rev. Nucl. Part. Sc
Hanbury-Brown Twiss correlations to probe the population statistics of GHz photons emitted by conductors
soumis le 22 mars 2004We present the first study of the statistics of GHz photons in quantum circuits, using Hanbury-Brown and Twiss correlations. The superpoissonian and poissonian photon statistics of thermal and coherent sources respectively made of a resistor and a radiofrequency generator are measured down to the quantum regimeat milliKelvin temperatures. As photon correlations are linked to the second and fourth moments of current fluctuations, this experiment, which is based on current cryogenic electronics, may become a standard for probing electron/photon statistics in quantum conductor
Experimental demonstrations of high-Q superconducting coplanar waveguide resonators
We designed and successfully fabricated an absorption-type of superconducting
coplanar waveguide (CPW) resonators. The resonators are made from a Niobium
film (about 160 nm thick) on a high-resistance Si substrate, and each resonator
is fabricated as a meandered quarter-wavelength transmission line (one end
shorts to the ground and another end is capacitively coupled to a through
feedline). With a vector network analyzer we measured the transmissions of the
applied microwave through the resonators at ultra-low temperature (e.g., at 20
mK), and found that their loaded quality factors are significantly high, i.e.,
up to 10^6. With the temperature increases slowly from the base temperature
(i.e., 20 mK), we observed the resonance frequencies of the resonators are blue
shifted and the quality factors are lowered slightly. In principle, this type
of CPW-device can integrate a series of resonators with a common feedline,
making it a promising candidate of either the data bus for coupling the distant
solid-state qubits or the sensitive detector of single photons.Comment: Accepted by Chinese Science Bulleti
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