23 research outputs found
Codici di distillazione per la mitigazione d’attacchi di tipo Denial of Service in comunicazioni Multicast
Si descrivono dei codici di distillazione per la mitigazione degli effetti di un DoS nelle comunicazioni multicast. Si fa uso di una tecnica di signature amortization basata sul Merkle tree, ulteriormente ottimizzato. Le comunicazioni dei dati sono su multi-channel: si prevede uno scheduling adeguato dei pacchetti sui diversi canali
MITS: the Multi-Imaging Transient Spectrograph for SOXS
The Son Of X-Shooter (SOXS) is a medium resolution spectrograph R~4500
proposed for the ESO 3.6 m NTT. We present the optical design of the UV-VIS arm
of SOXS which employs high efficiency ion-etched gratings used in first order
(m=1) as the main dispersers. The spectral band is split into four channels
which are directed to individual gratings, and imaged simultaneously by a
single three-element catadioptric camera. The expected throughput of our design
is >60% including contingency. The SOXS collaboration expects first light in
early 2021. This paper is one of several papers presented in these proceedings
describing the full SOXS instrument
Optical design of the SOXS spectrograph for ESO NTT
An overview of the optical design for the SOXS spectrograph is presented.
SOXS (Son Of X-Shooter) is the new wideband, medium resolution (R>4500)
spectrograph for the ESO 3.58m NTT telescope expected to start observations in
2021 at La Silla. The spectroscopic capabilities of SOXS are assured by two
different arms. The UV-VIS (350-850 nm) arm is based on a novel concept that
adopts the use of 4 ion-etched high efficiency transmission gratings. The NIR
(800- 2000 nm) arm adopts the '4C' design (Collimator Correction of Camera
Chromatism) successfully applied in X-Shooter. Other optical sub-systems are
the imaging Acquisition Camera, the Calibration Unit and a pre-slit Common
Path. We describe the optical design of the five sub-systems and report their
performance in terms of spectral format, throughput and optical quality. This
work is part of a series of contributions describing the SOXS design and
properties as it is about to face the Final Design Review.Comment: 9 pages, 9 figures, published in SPIE Proceedings 1070
The VIS detector system of SOXS
SOXS will be a unique spectroscopic facility for the ESO NTT telescope able
to cover the optical and NIR bands thanks to two different arms: the UV-VIS
(350-850 nm), and the NIR (800-1800 nm). In this article, we describe the
design of the visible camera cryostat and the architecture of the acquisition
system. The UV-VIS detector system is based on a e2v CCD 44-82, a custom
detector head coupled with the ESO continuous ow cryostats (CFC) cooling system
and the NGC CCD controller developed by ESO. This paper outlines the status of
the system and describes the design of the different parts that made up the
UV-VIS arm and is accompanied by a series of contributions describing the SOXS
design solutions.Comment: 9 pages, 13 figures, to be published in SPIE Proceedings 1070
The Acquisition Camera System for SOXS at NTT
SOXS (Son of X-Shooter) will be the new medium resolution (R4500 for a
1 arcsec slit), high-efficiency, wide band spectrograph for the ESO-NTT
telescope on La Silla. It will be able to cover simultaneously optical and NIR
bands (350-2000nm) using two different arms and a pre-slit Common Path feeding
system. SOXS will provide an unique facility to follow up any kind of transient
event with the best possible response time in addition to high efficiency and
availability. Furthermore, a Calibration Unit and an Acquisition Camera System
with all the necessary relay optics will be connected to the Common Path
sub-system. The Acquisition Camera, working in optical regime, will be
primarily focused on target acquisition and secondary guiding, but will also
provide an imaging mode for scientific photometry. In this work we give an
overview of the Acquisition Camera System for SOXS with all the different
functionalities. The optical and mechanical design of the system are also
presented together with the preliminary performances in terms of optical
quality, throughput, magnitude limits and photometric properties.Comment: 9 pages, 7 figures, SPIE conferenc
Architecture of the SOXS instrument control software
SOXS (Son Of X-Shooter) is a new spectrograph for the ESO NTT telescope,
currently in the final design phase.
The main instrument goal is to allow the characterization of transient
sources based on alerts. It will cover from near-infrared to visible bands with
a spectral resolution of using two separate, wavelength-optimized
spectrographs. A visible camera, primarily intended for target acquisition and
secondary guiding, will also provide a scientific "light" imaging mode.
In this paper we present the current status of the design of the SOXS
instrument control software, which is in charge of controlling all instrument
functions and detectors, coordinating the execution of exposures, and
implementing all observation, calibration and maintenance procedures.
Given the extensive experience of the SOXS consortium in the development of
instruments for the VLT, we decided to base the design of the Control System on
the same standards, both for hardware and software control.
We illustrate the control network, the instrument functions and detectors to
be controlled, the overall design of SOXS Instrument Software (INS) and its
main components. Then, we provide details about the control software for the
most SOXS-specific features: control of the COTS-based imaging camera, the
flexures compensation system and secondary guiding.Comment: 8 pages, 5 figure
Development status of the UV-VIS detector system of SOXS for the ESO-NTT telescope
SOXS will be the new spectroscopic facility for the ESO NTT telescope able to
cover the optical and NIR bands by using two different arms: the UV-VIS
(350-850 nm), and the NIR (800-2000 nm). In this article, we describe the
development status of the visible camera cryostat, the architecture of the
acquisition system and the progress in the electronic design. The UV-VIS
detector system is based on a CCD detector 44-82 from e2v, a custom detector
head, coupled with the ESO continuous flow cryostats (CFC), a custom cooling
system, based on a Programmable Logic Controller (PLC), and the New General
Controller (NGC) developed by ESO. This paper outlines the development status
of the system, describes the design of the different parts that make up the
UV-VIS arm and is accompanied by a series of information describing the SOXS
design solutions in the mechanics and in the electronics parts. The first tests
of the detector system with the UV-VIS camera will be shown.Comment: 10 pager, 13 figure