electronics and software for quantum astronomy progress report
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Quantum Astronomy Meeting in Bled. Electronics and Software for Quantum Astronomy Progress Report. Tommaso Occhipinti , Claudia Facchinetti, Andrea Dipaola, Paolo Zoccarato, Ivan Capraro, Sergio Billotta, Massimiliano - PowerPoint PPT PresentationTRANSCRIPT
Electronics and Software for Quantum Astronomy
Progress Report
Tommaso Occhipinti, Claudia Facchinetti, Andrea Dipaola, Paolo Zoccarato, Ivan Capraro, Sergio Billotta, Massimiliano Belluso, Giovanni Bonanno, Pietro Bolli, Filippo Messina, Cesare Barbieri, Sandro Centro
Bled, Slovenia, 26 March 2008
Quantum AstronomyMeeting in Bled
[email protected], Univ Padova 2
Outline
• Overview– Macro Blocks descriptins
• EquA: Electronics for quantum Astronomy
• ATFU: Asiago Time and Frequency Unit– HARRISON prj
• QUAS: Quantum Astronomy Software
[email protected], Univ Padova 3
Overall Scheme
EQuAElectronics for
Quantum Astronomy
ATFUAquEYE Time
and Frequency Unit
OpticsTelescope, Optical
AquEYE and Detectors
Mass Storage
QuASQuantum Astronomy Software
Scientific DATA
[email protected], Univ Padova 4
Overview of the System
SPAD 0
SPAD 3
TDC
OscillatorOCXO TCXORUBIDIUM
External ref. (input)
0
1
2
3PC ControllerVME
Optical Bridge
10 Mhz clock (output)
ExternalStorage
DATA BUS
GALILEOReceiver
Max output rate = 10 MhzTypical rate = 100 KhzSPAD precision = 30 ps
AquEYE Time & Frequency Unit (ATFU)
[email protected], Univ Padova 5
EquA Design EQuAElectronics for
Quantum Astronomy
CaenTDC
Board
PCControl
&Storage
BackupCouters
[email protected], Univ Padova 7
Optical fiber connected to a PCI board in the PC
• Dual Core• 2 SATA 250G• 1 Ex TERA USB2
EquA Design EQuAElectronics for
Quantum Astronomy
[email protected], Univ Padova 8
EquA: Data BandW Limitation EQuAElectronics for
Quantum Astronomy
EQuAElectronics for
Quantum Astronomy
Incoming PULSE/s Readout Rate
8 MHzBut we are reaching
10 Mhz
60 Mbytes/s
[email protected], Univ Padova 9
EquA: OP MODES
• Continuous Storage– From max count
rate to 100 KHz– The rollover can be
compensated by software
• Trigger Matching– From 100 KHz to
0– Infinite
measurement– The rollover of the
Triggers can be compansated by software
EQuAElectronics for
Quantum Astronomy
[email protected], Univ Padova 10
• Sw structure is multi-thread optimized to allow simultaneous read-out, statistics calculations and disk storage
• On the dual-core CPU, with careful priorities setup, one core takes care of read-out and the other of statistics and storage in real time
• A new firmware has been installed into TDC board: new performance – – VME: Readout rate: ~ 60Mbyte/s, each hit data is written in a
32bit line– the FIFO size is 32kx32bit: 60Mbyte s-1/4byte=15MHz → Upper
limits of read-out data from FIFO buffer. – On single channel (working with 4 channel) is 15MHz/4= ~8
Mhz
EquA: Aquisition Strategy and Performance
EQuAElectronics for
Quantum Astronomy
[email protected], Univ Padova 11
• The general approach is to simplify as much as possible astronomers work by masking the complexity of the system.– Options: acquisition mode, internal pulser, raw
data output format, exposure time - read only, object name, fix the output file size
• The command-line nature of the acquisition s/w allows the usage through telnet or SSH
EquA: User Options EQuAElectronics for
Quantum Astronomy
[email protected], Univ Padova 12
• The system supports two formats : raw data and FITS (binary table)
– The FITS format provides data using time relative to acquisition start and channel index for each hit.
– Raw data is a temporary format that allows system debugging
EquA: Output files EQuAElectronics for
Quantum Astronomy
[email protected], Univ Padova 13
• Software is controlled by TXT configuration files containing H/W working parameters
• S/W produces TXT LOG files that permanently report details, events and warning messages
• FITS header are user configurable by mean of ascii templates
EquA: Control and debugging information
EQuAElectronics for
Quantum Astronomy
[email protected], Univ Padova 15
10 MHzSinusoidal
ATFU System
Sinusoidal to TTL converter built in Catania
10 MHzTTL
SRS FS725 Rubidium Frequency Standard
40 MHzTTL
FPGA 10 MHz to 40 MHz converter projected by Massimiliano Belluso
CAEN VME CRATE with V2718, V976 and V1290N
40 MHzTTL
40 MHzTTL
Regeneratethe signal
V976
V1290N
ATFUAquEYE Time
and Frequency Unit
[email protected], Univ Padova 16
1 PPSTTL
40 MHzTTL
PPS to the TDC
ATFU
Mini-T Trimble Disciplined OCXO
1 PPSTTL
1 PPSNIM
OCXO
ATFUAquEYE Time
and Frequency Unit
ATFUAquEYE Time
and Frequency Unit
[email protected], Univ Padova 17
ATFU Tests ATFUAquEYE Time
and Frequency Unit
We tested several jitters/precision:
1. 10Mhz2. 40Mhz3. 1PPS4. 20Khz
At the moment:300ps for the overall system in the 40 Mhz chain
We can IMPROVE!
[email protected], Univ Padova 18
ATFU
• Paolo Zoccarato contribution …
ATFUAquEYE Time
and Frequency Unit
[email protected], Univ Padova 19
ATFU: HARRISON PRJ
• Harrison prj will give us, both Padova and Ljubljana, TWO ACTS (Accurate and Certified Time System) units for all the month of OCTOBER 2008
ATFUAquEYE Time
and Frequency Unit
ACTSPOWER
INTERNET
2 GPS Antennas
10 Mhz40 Mhz20 KhzPPS signalsNTP Signal on ETH
[email protected], Univ Padova 20
ACTS - AQUEYE I/O
ACTS
40MHz/ECL
20KHz/NIM
ETH/RS232
PPS
ATFUAquEYE Time
and Frequency Unit
[email protected], Univ Padova 21
ATFU: HARRISON TODO
• In Padua and Ljubljana will arrive ACTS (Thales Alenia Space Italy, TASI) 3 days before the observations
• TASI people will need:– Power, External internet, accessibility to the roof for the
installation of the TWO antennas• They will take 1 day after the observation for the
ACTS removal
• We have to decide a SCHEDULE of observations• We have to decide the possible utilizations of
ACTS as it is a very accurate and stable machine.– Common measurements with NTP????
ATFUAquEYE Time
and Frequency Unit
[email protected], Univ Padova 22
QuASQuantum Astronomy Software
[email protected], Univ Padova 23
QUAS
• A matlab compilation of scripts– …moving to C++ and QT libs for GI
QuASQuantum Astronomy Software
QuASQuantum Astronomy Software
FILEs:.TXT.DAT.FITS
N(t)c(t) g2(t)PSDHist of N(t)Hist of DIFFs…
[email protected], Univ Padova 24
The first light of AquEYE
2 October 2007
QuASQuantum Astronomy Software
[email protected], Univ Padova 25
Other Results
• ZZ Pesci – Long period (about 800 s)
QuASQuantum Astronomy Software
[email protected], Univ Padova 26
One important result
• The Crab Nebula Optical Pulsar
QuASQuantum Astronomy Software
[email protected], Univ Padova 27
QUAS: examples small dt QuASQuantum Astronomy Software
G2(t) Cross Correlation PSD
Histogram of N(t) Rate of each channel PSD of each channel
[email protected], Univ Padova 28
CRAB PPS compensation (working on)
First 50 s of the measurement … after about 1 our
[email protected], Univ Padova 29
Questions?
View from the Ekar observatory in October
Tommaso Occhipinti
View from the Ekar observatory in October
Tommaso Occhipinti