| AURIGA |
An acronym for the Italian
expression: Antenna Ultracriogenica Risonante per l'Indagine
Gravitazionale Astronomica (in English: Ultracryogenic
Resonant Antenna for the Astronomical Gravitational Investigation). |
| CASE |
An acronym for: Computer
Aided Software Engineering: a set of utilities/compilers/editors
to manipulate a software source code at block-diagram level. |
| effective
mass |
A mechanical resonator can
be treated as a spring-mass system, around its resonance. The
effective mass is the mass in the spring-mass system; generallu it
is lower that the inertial mass of the mechanical resonator. |
| FFT |
An acronym for: Fast
Fourier Transform.An
efficient implementation of the Fourier transform in the discrete
time domain, with a logarithmic increase of the number of operations
per each output sample. |
| finesse |
The finesse of a
Fabry-Perot cavity is defined as the ratio between the cavity FSR
and the cavity linewidth. |
| FSR |
An acronym for: Free
Spectral Range. The FRS of a Fabry-Perot cavity is the frequency
interval between two consecutive peaks of the same electromagnetic
mode. If L is the length of the cavity and c the light speed,
FSR=c/(2L). |
| GPS |
An acronym for: Global
Positioning System. It is a method to determine geographical
coordinates and local time coordinate on Earth using calibrating
signals from a network of satellites. It is based on the knowledge
of the orbits of the satellites and the measured phase shifts of
their signals at the receiver. The precision of this measure is of
~100m in position and ~1µs in time. |
| g.w. |
A short form for
gravitational wave. |
| IGEC |
An acronym for: International
Gravitational Event Collaboration. |
| INFN |
An acronym for the Italian
expression: Istituto Nazionale di Fisica Nucleare (in
English: National Institute for Nuclear Physics). |
| IRQ |
Interrupt Request: the name of an logic signal directed to a specific processor
input port which causes the processor to suspend normal instruction execution
temporarily and to start executing an interrupt handler routine. |
| IVC |
An acronym for: Internal
Vacuum Chamber. It is the vacuum chamber that houses the bar,
the readout electronic and the inner thermal shields, inside the
AURIGA cryostat. |
| LNL |
An acronym for the Italian
expression: Laboratori Nazionali di Legnaro (in English: National
Laboratories of Legnaro). |
| mixing
chamber |
It is the last (coldest)
stage of the dilution refrigerator where the phase transition of the
mixtures 3He-4He occurs. This phenomenon
allows the refrigeration |
| MXI bus |
Multisystem eXtension
Interface: it is a 8MB/s bus for connection of up to 8 digital
devices and expansion boards. |
| OVC |
An acronym for: Outer
Vacuum Chamber. It is the vacuum chamber that houses the outer
aluminum thermal shields, inside the AURIGA cryostat. It provides
for the isolation vacuum between the laboratory environment
and the liquid helium vessel. |
| RS323 port |
Standard serial
communication port for workstations and PC's. |
| SQUID |
An acronym for: Superconducting
QUantum Interference Device. |
| Shh |
Power spectral density of
the total noise in terms of g.w. amplitude at the detector input |
| SNR |
An acronym for: Signal to
Noise Ratio. It is the ratio of the maximum amplitude of a signal
and the noise root mean square. |
| VXI bus |
The VXI (VME eXtension for
Instrumentation) is an enhanced version of VME (Versa Module
Eurocard) bus, and is made up of control and syncronization lines
between digital boards (with TTL or ECL signals) that are capable of
up to 100MB/s data transfer rate and IRQ generation and transmission
with a time jitter of 100ns.
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