87 research outputs found
A flexible and low-cost open-source IPMC mezzanine for ATCA boards based on OpenIPMC
This work presents the development of an Intelligent Platform Management Controller mezzanine in a Mini DIMM form factor for use in electronic boards compliant to the PICMG Advanced Telecommunication Computing Architecture (ATCA) standard. The module is based on an STMicroelectronics STM32H745 microcontroller running the OpenIPMC open-source software. The mezzanine has been successfully tested on a variety of ATCA boards being proposed for the upgrade of the experiments at the HL-LHC, with its design and firmware being distributed under open-source hardware license
Evaluating the RFSoC as a Software-Defined Radio readout system for Magnetic Microcalorimeters
Arrays of superconducting sensors enable particle spectrum analysis with superior energy resolution. To efficiently acquire data from frequency multiplexed sensors, the readout electronics operating at room temperature must perform multiple tasks, such as low-noise probe tone generation,
frequency demodulation, and data decimation. We designed a Software-Defined Radio (SDR) system composed of an MPSoC board, an analogue-digital conversion stage, and a radio frequency front-end mixing stage to meet the system requirements of 4 GHz instantaneous bandwidth and real-time data analysis. Nevertheless, utilising a Radio Frequency System-on-Chip (RFSoC) could simplify the overall system by integrating the conversion stage. This work investigates the applicability of RFSoCs for the aforementioned use case
DTS-100G — a versatile heterogeneous MPSoC board for cryogenic sensor readout
Heterogeneous devices such as the Multi-Processor System-on-Chip (MPSoC) from Xilinx are extremely valuable in custom instrumentation systems. This contribution presents the joint development of a heterogeneous MPSoC board called DTS-100G by DESY and KIT. The board is built around a Xilinx Zynq Ultrascale+ chip offering all available high-speed transceivers using QSFP28, 28 Gbps FireFly, FMC, and FMC+ interfaces. The board is not designed for a particular application, but can be used as a generic DAQ platform for a variety of physics experiments. The DTS-100G board was successfully developed, built and commissioned. ECHo-100k is the first experiment which will employ the board. This contribution shows the system architecture and explains how the DTS-100G board is a crucial component in the DAQ chain
Contribution of a Disk Component to Single Peaked Broad Lines of Active Galactic Nuclei
We study the disk emission component hidden in the single-peaked Broad
Emission Lines (BELs) of Active Galactic Nuclei (AGN). We compare the observed
broad lines from a sample of 90 Seyfert 1 spectra taken from the Sloan Digital
Sky Survey with simulated line profiles. We consider a two-component Broad Line
Region (BLR) model where an accretion disk and a surrounding non-disk region
with isotropic cloud velocities generate the simulated BEL profiles. The
analysis is mainly based in measurements of the full widths (at 10%, 20% and
30% of the maximum intensity) and of the asymmetries of the line profiles.
Comparing these parameters for the simulated and observed H broad
lines, we {found} that the hidden disk emission {may} be present in BELs even
if the characteristic {of two peaked line profiles is} absent. For the
available sample of objects (Seyfert 1 galaxies with single-peaked BELs), our
study indicates that, {in the case of the hidden disk emission in single peaked
broad line profiles}, the disk inclination tends to be small (mostly
) and that the contribution of the disk emission to the total flux
should be smaller than the contribution of the surrounding region.Comment: 18 Figures, 1 Table, MNRAS-accepted. MNRAS-accepte
Contribution of the Disk Emission to the Broad Emission Lines in AGNs: Two-component model
We present an investigation of the structure of the emission line region in a
sample of 12 single-peaked Active Galactic Nuclei (AGNs). Using the high
resolution H-beta and H-alpha line profiles observed with the Isaac Newton
Telescope (La Palma) we study the substructure in the lines (such as shoulders
or bumps) which can indicate a disk or disk-like emission in Broad Line Regions
(BLRs). Applying Gaussian analysis we found that both kinds of emission
regions, BLR and NLR, are complex. In this sample the narrow [OIII] lines are
composites of two components; NLR1 which have random velocities from \sim 200
to 500 km/s and systematic velocities toward the blue from 20 to 350 km/s, and
NLR2 with smaller random velocities (\sim 100-200 km/s) and a redshift
corresponding to the cosmological one. The BLR also have complex structure and
we apply a two-component model assuming that the line wings originate in a very
broad line region (VBLR) and the line core in an intermediate line region
(ILR). The VBLR is assumed to be an accretion disk and the ILR a spherical
emission region.
The model fits very well the H-alpha and H-beta line profiles of the AGNs.Comment: 11 pages, A&A, accpte
An FPGA based track finder for the L1 trigger of the CMS experiment at the High Luminosity LHC
Circumstellar discs: What will be next?
This prospective chapter gives our view on the evolution of the study of
circumstellar discs within the next 20 years from both observational and
theoretical sides. We first present the expected improvements in our knowledge
of protoplanetary discs as for their masses, sizes, chemistry, the presence of
planets as well as the evolutionary processes shaping these discs. We then
explore the older debris disc stage and explain what will be learnt concerning
their birth, the intrinsic links between these discs and planets, the hot dust
and the gas detected around main sequence stars as well as discs around white
dwarfs.Comment: invited review; comments welcome (32 pages
A Far-ultraviolet Atlas of Low-resolution Hubble Space Telescope Spectra of T Tauri Stars
We present a far-ultraviolet (FUV) spectral atlas consisting of spectra of 91
pre-main sequence stars. Most stars in this sample were observed with the Space
Telescope Imaging Spectrograph (STIS) and Advanced Camera for Surveys (ACS) on
the \emph{Hubble Space Telescope} (\emph{HST}). We find strong correlations
among the \ion{O}{1} 1304 triplet, %\ion{C}{2} 1335, the
\ion{Si}{4} 1394/1403 doublet, the \ion{C}{4} 1549
doublet, and the \ion{He}{2} 1640 line luminosities. For classical T
Tauri stars (CTTSs), we also find strong correlations between these lines and
the accretion luminosity, suggesting that these lines form in processes related
to accretion. These FUV line fluxes and X-ray luminosity correlate loosely with
large scatters. The FUV emission also correlates well with H, H,
and \ion{Ca}{2} K line luminosities. These correlations between FUV and optical
diagostics can be used to obtain rough estimates of FUV line fluxes from
optical observations. Molecular hydrogen (H) emission is generally
present in the spectra of actively accreting CTTSs but not the weak-lined T
Tauri stars (WTTSs) that are not accreting. The presence of H emission in
the spectrum of HD 98800 N suggests that the disk should be classified as
actively accreting rather than a debris disk. The spectra in the atlas are
available at http://archive.stsci.edu/prepds/ttauriatlas.Comment: 89 pages, 30 figures, published in Ap
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