starbase intensity interferometry update
DESCRIPTION
StarBase Intensity Interferometry Update. D. Kieda, N. Matthews, N. T raeden , J. Skowronek University of Utah SII Workshop May 13, 2014. Digitizer System. NI Flex-Rio digitizer Digitizer (250 Mhz sampling) & Virtex5 FPGA Front end (4 channels, 14 bit resolution (Truncate to 8 bit)) - PowerPoint PPT PresentationTRANSCRIPT
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Observatorie CA HBT Workshop
StarBase Intensity Interferometry Update
D. Kieda, N. Matthews, N. Traeden,J. Skowronek
University of Utah
SII Workshop May 13, 2014
5/13/2014
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Observatorie CA HBT Workshop5/13/2014
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Observatorie CA HBT Workshop5/13/2014
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Observatorie CA HBT Workshop5/13/2014
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Observatorie CA HBT Workshop
Digitizer System• NI Flex-Rio digitizer Digitizer (250 Mhz sampling) & Virtex5 FPGA Front end (4
channels, 14 bit resolution (Truncate to 8 bit))
• Record to high speed 12 TB RAID system (750 Mbyte/sec)
Able to stream continuously for >6 hours
• Periodic GPS Time Stamp of FADC clock to better < 4 nsec rms
5/13/2014
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5/13/2014 Observatorie CA HBT Workshop
Record all Streaming data: GPS timestamp• Post Processing (2, 3, ..N Telescope Coorrelations)• FFT Analysis• Develop/Apply Digital Filters to increase S/N
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Observatorie CA HBT Workshop
Filtered PMT Spectrum
5/13/2014
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DAQ System
5/13/2014 Observatorie CA HBT Workshop
PMT/APDPreamp/Fiber Optic transmitter
Pxie Bus
Virtex -5 FPGA
250 Mhz A/DConv
CPU
Streaming RAID Controller
12 TB 750 MB/Sec RAID
GPS Clock
I Gbit/sec
100 Mbyte/sec
Pxie Backplane (4 Gbit/sec)
Virtex-5 FPGA has multipleParallell-pipline FFT coresReal time data-Filtering/coorrelation?
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5/13/2014 Observatorie CA HBT Workshop
Tele 1
Tele 2
Digital Filter
Digital Filter
y2
x2
x*y
Pipelined Data Analysis
This may be the only way of keeping up with the large dataflow in real time…..
Auto-correlation
Auto-correlation
Cross-correlation
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Digitizer/Software Correlationtests with PMTs/Preamps
Simulated Single PMT Measured Single PMT
AutoCorrelation AutoCorrelation5/13/2014 Observatorie CA HBT Workshop
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2 PMT Cross Correlation: Noise Pickup between adjacent PMTs -Radio Crosstalk generated by RF noise from PMTs firing-Encase in RF shielding/Use Fiber optics to sample light
4nsec
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2 PMT Cross Correlation: Residual Correlation -Cosmic ray secondary particles striking both PMTs-Cosmic ray charged particles fluorescing in fiber optic cable
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Digitizer/Software Correlation tests with PMTs/Preamps
Simulated 2-PMT Cross-correlation Measured PMT Cross-Correlation background
2G events seeded correlation = 1e-3 correlation noise < 1E-4
We should be able to measure correlation with excellent accuracy!
5/13/2014 Observatorie CA HBT Workshop
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SII Lab Measurement/Hole diameters(Laser/Rotating Disk)
5/13/2014 Observatorie CA HBT Workshop
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Observatorie CA HBT Workshop5/13/2014
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Telescope Tracking Control System:
LabView Based Servo System
Remnant of “Telescope Array 1999”
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50
70
90
110
130
150
170
190
210
6383
2
6402
9
6422
6
6442
2
6461
9
6481
5
6501
1
6520
7
6540
3
6559
9
6579
6
6599
1
6618
8
6638
3
6658
0
6677
6
6697
3
6717
1
Time in Seconds (LST)
Azi
mut
h A
ngle
(deg
rees
)
Az Position
Az Target
50
55
60
65
70
75
80
85
90
95
6383
2
6401
8
6420
3
6438
8
6457
3
6475
8
6494
3
6512
8
6531
4
6549
8
6568
4
6586
8
6605
3
6623
8
6642
3
6660
8
6679
3
6697
9
6716
5
Time in Seconds (LST)
Elev
atio
n A
ngle
(deg
rees
)
El Position
El Target
80.2
80.25
80.3
80.35
80.4
80.45
6395
3
6395
5
6395
8
6396
0
6396
3
6396
5
6396
7
6397
0
6397
2
6397
5
6397
7
6397
9
6398
2
6398
4
6398
7
6398
9
6399
1
Time in Seconds (LST)
Elev
atio
n An
gle
(deg
rees
)
El Position
El Target
Observed tracking Performance: Alpha Lyrae Tracking
Error < 0.01°
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5/13/2014 Observatorie CA HBT Workshop
Star Observations (April 2014):
αLeo (Regulus): V = +1.35
ε Leo (Algenubi) V= +2.98
Single Telescope Observations
• Study Telescope tracking• Night Sky Noise• Interference noise
• Needs some further investigation, pipelined filtering?
Two Telescope Observations In Summer 2014
Test SII & Pipelined RT analysis
NSB
VSCEL cutoff
Signal
VSCEL Filter
??
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Observatorie CA HBT Workshop
Observation times with the StarBase telescopes
StarBase:
For T= 15 min ( V =1 )
T= 97 min (V = 2)
StarBase Baseline: 23m
Unresolved < 1 mas (400 nm)
Examples: α Leo, β Tau or η Uma
5/13/2014
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5/13/2014 Observatorie CA HBT Workshop
FutureTesting at StarBase Summer 2014: 2-telescope correlations
Testing at VERITAS (late 2014?)
CTA observatoryNeed to write Science Requirements, Level A/B requirementsTechnical Design review period ending (30 days)After TDR design gets frozen: Difficult to add after!
High priority: Need to form working group!
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5/13/2014 Observatorie CA HBT Workshop
CTA Design QuestionsPhoto-detectors (SST, MST, LST, SCT)Telescope-to-Telescope digitization synchronization (< 2 nsec)Digitization/Storage requirementsData processing requirements
Real Time Monitoring Higher order correlations