Present and Future of the Arecibo Observatory Instrumentation Luis

Present and Future of the Arecibo Observatory Instrumentation Luis

Present and Future of the
Arecibo Observatory
Instrumentation
Luis A. Quintero
Cornell University / NAIC
National Astronomy and Inonosphere Center
CASPER 2010 Workshop
17 August 2010
Outline
• The Arecibo Observatory
• Backends at the Arecibo Observatory
- Interim Correlator
- WAPP
- Mock Spectrometer
- Galspect
- VLBA Mark4 & Mark5B (continuum)
- Radar Interface (continuum)
• Future Backends
- rDBE & Mark5C
- Arecibo GUPPI
- ROACH Based Radar Interface
• Questions
CASPER 2010 Workshop
August 17, 2010
Arecibo Observatory
It is part of the National Astronomy and Ionosphere
Center (NAIC) at Cornell University and funded by
the National Science Foundation (NSF)
~900Ton
~80m
~100m
305m
CASPER 2010 Workshop
August 17, 2010
Transmitters & Receivers
Goldsmith, P. et al. “Multi-feed Systems for the Arecibo Gregorian”, ASP, 1995
CASPER 2010 Workshop
August 17, 2010
Transmitter – 430 MHz
2 x klystrons for 2MW of
pulsed power
Aeronomy: Incoherent
Ionosphere scattering
CASPER 2010 Workshop
August 17, 2010
430MHz Radar - Ionosphere
CASPER 2010 Workshop
August 17, 2010
Transmitter – S-band 2380MHz
http://www.naic.edu
Moon
http://www.naic.edu
Venus
http://www.naic.edu
Saturn
Rings
Ganesan, R. “Telescope Electronics”, May 2006
2 x klystrons for 1MW
CW power
http://www.naic.edu
CASPER 2010 Workshop
August 17, 2010
Asteroids
2380MHz Planetary Radar
CASPER 2010 Workshop
August 17, 2010
Backends at the Arecibo Observatory
Spectrometers
• Interim Correlator
• WAPP
• Galspect
• Mock Spectrometer
Continuum Observations
• VLBA Mark4 & Mark5B
• Radar Interface (continuum)
CASPER 2010 Workshop
August 17, 2010
Interim Correlator
50MHz BW – ASIC Correlator Chip
Jon Hagen (NAIC), John Canaris (U. New Mexico
/ NASA SERC - Space Engineering Research
Center)
CASPER 2010 Workshop
August 17, 2010
Wideband Arecibo Pulsar Processors (WAPP)
• 4 WAPPs
• 1 WAPP = 2 IF Channels
2 Correlators
1 Multiplexer
• 50/100 MHz BW
• auto / crosscorrelations
• Step attenuators
• Technical issues:
Difficult to troubleshoot
Obsolete parts
CASPER 2010 Workshop
August 17, 2010
Wideband Arecibo Pulsar Processors (WAPP)
CASPER 2010 Workshop
August 17, 2010
WAPPs Corralators (~1995)
High Performance CMOS Correlator Chip (ASIC)
• 16 Chips per
board
• Autocorrelation /
Crosscorrelation
• 1024 Lags / chip
• 100MSPS each
• “Low Power”
• TTL compatible
http://www.naic.edu/~astro/general_info/correlator/cmos.html
CASPER 2010 Workshop
August 17, 2010
GALFA Spec, / GALSPECT (~2004)
• Backend built by UCB for the
Arecibo L-band Feed Array
(ALFA) multibeam receiver
• 7 beams, dual polarization
• Outputs*:
Narrrowband: 8192channels,
7MHz BW
Wideband: 512 channels,
100MHz BW
* http://seti.ssl.berkeley.edu/galfa/
CASPER 2010 Workshop
August 17, 2010
Mock Spect. / PDEV (~2007)
Digitizers
Digital Board
Designed and developed by
Jeff Mock
• 8 x AD9430, 12bits ADCs
• 2 x Xilinx Virtex II Pro FPGA
• 2 QDR Mem, 2M x 36
• 1x PowerPC Processor
• Flash & SRAM mems
• 2 x 1GbE, 2 x RS232
• 5 x SMA (clk, PPS, etc)
• LCD 128x64 pixels
CASPER 2010 Workshop
August 17, 2010
PDEV – Digitizers / Programming
Digitizers:
• 2 Digitizers / PDEV
• 4 x AD9430 / Digitizer
• ADC 12bits, 170MSPS
Programming:
• Linux kernel v2.6.15
• VHDL/Verilog (FPGAs)
• C/C++, Perl (client/server)
CASPER 2010 Workshop
August 17, 2010
PDEV – Architecture
QDR
2Mx36
ADC
ADC
ADC
ADC
GX
Flash /
SRAM
PCIe x8
MGT
2VP70
2 x GbE
PPC
440GX
2 x RS232
ADC
ADC
ADC
ADC
GX
2VP70
QDR
2Mx36
PCIe x8
MGT
CASPER 2010 Workshop
August 17, 2010
4 x SMA
PDEV – Mock Spectrometer
CW, Noise,
CW + Noise
TEST
SIGNAL
12
ADC0
CONFIGURATION REGISTERS
CASPER 2010 Workshop
August 17, 2010
PROC. INT.
PACKETIZE
ACCUMULATOR
ADC0
STOKES
12
PFB/FFT 16-8k
ADC0
SWITCH
12
GAIN/OFFSET
ADC0
DDC (DDS, LPF)
12
EALFA / PALFA Backend
14 PDEVs*
7 for 7 ALFA pixels (primary)
7 for 7 ALFA pixels (commensal)
14 File servers (4TB)
We own in total 24 PDEVs
DDC (DDS, Mixer, DLPF)
PFB (up to 8192 channels)
Stokes parameters
Accumulation, Packing
* http://www.naic.edu/~phil/talks/vc09/tel_Perf_datatking_09.ppt
CASPER 2010 Workshop
August 17, 2010
Other PDEV Projects
Aeronomy:
• Tamara Hall (consultant)
S-Band Radar (Planetary
Datataking):
• Doppler correction, DDC
Single pixel baseband
sampling (Phil Perillat)
CASPER 2010 Workshop
August 17, 2010
Our Experience with
Tools
• Summer 2009 we
received: ADC2x1000-8 &
iBOB, Dan Werthimer
• Summer 2009, Andrew
Siemion, tricks!
• Summer 2010, Jayanth
Chennamangalam, WVU.
Histogrammer, 10GbE.
CASPER 2010 Workshop
August 17, 2010
VLBA Mark IV & Mark5A
VLBI – Very Large
Baseline Interferometry
Data Recorders
•Mark IV Data Acquisition
Terminal (AO, 90s)
• Mark5A Recorder
CASPER 2010 Workshop
August 17, 2010
Radar Interface (80s & 90s)
• Triggered by external
signals
•4xADC, 12bits, 10MHz
• 24x8k FIFO
• Computer control via
5MHz serial lines
• Bit selection
CASPER 2010 Workshop
August 17, 2010
Future Backends
• 2 x (rDBE & Mark5C) / 305m & 12m antennas
• Arecibo GUPPI
• ROACH Based Radar Interface
CASPER 2010 Workshop
August 17, 2010
RDBE - Haystack/NRAO (2010)
ROACH Digital Backend
• Polyphase-Filter-Bank (PFB)
• Emulate several VLBA BBCs on a ROACH
board (VDBE)
CASPER 2010 Talks
Russ McWhirter, Haystack, Haystack/NRAO
Digital Backend on the ROACH Platform
Keith Morris, NRAO, RDBE Implementation for
VLBA
Wed, Aug 18, 2010
CASPER 2010 Workshop
August 17, 2010
Phase Reference Antenna
Patriot Antenna Systems - 12m Aperture S/X
receivers for geodesy : 2.25GHz (S-band), 8.5GHz
(X-band); wideband VLBI2010 Rx in the future
CASPER 2010 Workshop
August 17, 2010
RDBE Connected to the Telescopes
IF/LO
IF/LO
rDBE
rDBE
Mark5C
Mark5C
Hydrogen
Maser
CASPER 2010 Workshop
August 17, 2010
Arecibo GUPPI
GUPPI: Green Bank Ultimate Pulsar Processing
Instrument
• Coherent de-dispersion mode
CASPER 2010 Talk, Paul Demorest, Pulsar
Science with GUPPI, Thu, Aug 19, 2010, 9:30a.m.
CASPER 2010 Workshop
August 17, 2010
ROACH Based Radar Interface
• Baseband Converter, I/Q with Doppler
Correction, 2.5hours
• 25MHz (50MHz) maximum continuous
bandwidth for two IF channels (polA/polB)
• DDS/Clock drifting
• Programmable digital filters
• Bit selection, max 8bits (12bits)
ADC2x1000-8, v1.1, 8bit, 2x1Gsps
ROACH I, Virtex 5
CASPER 2010 Workshop
August 17, 2010
Questions?