novel technology for ultra-sensitive cosmology...
TRANSCRIPT
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Experimental Cosmology Group Oxford Astrophysics
Novel Technology for Ultra-Sensitive
Cosmology Instruments
G. Yassin
University of Oxford
Pasadena, June 22nd 2008
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Experimental Cosmology Group Oxford Astrophysics
Technology for Ultra-Sensitive Cosmology Instruments
• CMB B-mode science requirements.
• Instruments Design
• Telescope
• Feed arrays
• Phase modulation
• Detectors
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Experimental Cosmology Group Oxford Astrophysics
Why Phase Modulate?
• Reduce 1/f noise• Measure Stokes parameters without moving
correlation receiver components
ϕ
ϕOMT
Switches
Horn Hybrid
Phase
Hybrid
OutputsDetector
Quadrature Quadrature
1 cos sin2 cos sin
D I Q UD I Q U
ψ ψψ ψ
= − −= + +
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Experimental Cosmology Group Oxford Astrophysics
Multi-flare (smooth-walled)
Profiled Corrugated
horn
Three flare-steps horn
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Experimental Cosmology Group Oxford Astrophysics
Generalize to a wideband horn
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Experimental Cosmology Group Oxford Astrophysics
Hornsynth Software Package
• Written by P. Kittara , A. Jiralucksanawong (MahidolUniversity, Thailand) in collaboration with Ghassan Yassin(Oxford Physics)
• It consists of two software packages: (1) modal matching software (2) Optimization software
• The minimization package is a Genetic Algorithm routine and a Simplex routine
• The software searches for the global minima according to a “fitness” criteria. In our case it is the circularity and cross-polarization level.
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Experimental Cosmology Group Oxford Astrophysics
Design using a Genetic Algorithm (GA)
Generate new
generation using crossover and
mutation
Reject poorest
half of population
Calculate beam patterns using
the modal matching technique
Generate initial population of N sets
of Potter Horn parameters
Repeat for500 to 1000 generations
End
Evaluate quality function for each
ofthe N individuals.
• We have successfully parallelizedthe code to run over the UK GRID
computing system, in collaboration with Oxford eScience.
• Spread processor intensive modal matching and quality function evaluation over multiple processors.
•Currently optimizing designs with 4 flare angles.
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Experimental Cosmology Group Oxford Astrophysics
Three angles horn design
Hornsynthoutput
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Experimental Cosmology Group Oxford Astrophysics
Horn dimensions at 230 GHz
3.652Aperture
2.4Length of the 3nd conical section,
1.812Radius of the 2st conical section,
1.212Length of the 2nd conical section,
1.486Radius of the 1st conical section,
1.479Length of the 1st conical section,
1.24 (mm)Initial waveguide radius,
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Experimental Cosmology Group Oxford Astrophysics
First Three steps horn-220 GHz
-60
-50
-40
-30
-20
-10
0
-60 -40 -20 0 20 40 60
"080319_beam3.pat" u ($1-42.5):($2*10-77.5)"3section_1.2_230.pat.220.0" u 1:3
-60
-50
-40
-30
-20
-10
0
-60 -40 -20 0 20 40 60
"080319_beam7.pat" u ($1-48.0):($2*10-83)"3section_1.2_230.pat.220.0" u 1:2
H-plane E-plane
Green: Theory Red: Measured
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Experimental Cosmology Group Oxford Astrophysics
First Three steps horn-250 GHz
-60
-50
-40
-30
-20
-10
0
-60 -40 -20 0 20 40 60
"080319_beam4.pat" u ($1-42.5):($2*10-70.5)"3section_1.2_230.pat.250.0" u 1:3
-60
-50
-40
-30
-20
-10
0
-60 -40 -20 0 20 40 60
"080319_beam8.pat" u ($1-43.8):($2*10-74.3)"3section_1.2_230.pat.250.0" u 1:2
Pattern at 250 GHz
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Experimental Cosmology Group Oxford Astrophysics
Cross Polarization Measurement
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Experimental Cosmology Group Oxford Astrophysics
Drilling Technology
-60
-50
-40
-30
-20
-10
0
-60 -40 -20 0 20 40 60
dB
Degrees
230 GHz H-plane Theory / Exp
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Experimental Cosmology Group Oxford Astrophysics
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Oxford Astrophysics
Four probe OMT• Combine orthomode transducer and waveguide to transmission line
coupling in single on-chip structure• 4 rectangular probes in circular waveguide• Probes sit in front of waveguide backshort• Each pair of probes only respond to one polarization mode• Signal is split equally between pair of probes
• Recombine signals in 180O hybrid, or send to separate detectors• Hybrid improves cross-polar rejection - usually by > 20 dB• Design is optimised in HFSS to give best return loss and cross-polar
performance over desired band
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Oxford Astrophysics
Four probe OMTs in action• 4 probe OMTs have been developed for
C-BASS, a 5 GHz polarimeter, and the 150 and 225 GHz channels of Clover
• Now working on OMT for 350 GHz CEB
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Experimental Cosmology Group Oxford Astrophysics
CBASS OMT at 5 GHz
Grimes et al Electron Lett., 43, 1146, 2007
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Experimental Cosmology Group Oxford Astrophysics
Existing Methods of Modulation at Millimetre wavelengths
• Mechanical rotation: difficult and expensive to realise and mass produce in cryogenic environment and expensive
• Faraday Rotor Ferrite Rods: difficult to mass-produce and lossy.
• Rotating Wave-plate: Obstructs the array can suffer from anisotropy.
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Experimental Cosmology Group Oxford Astrophysics
Planar Phase Modulation
• Collaboration between Oxford and Chalmers
• References:– Yassin,G., Kuzmin, L. S., Grimes, P., Tarasov, M., Otto, E. and Mauskopf, P. D.
(2007) “An Integrated Superconducting Phase Switch for Cosmology Instruments” Physica C: Applied Superconductivity and Application, vol. 466 (issue 2) pp. 115-123
– Kuzmin,L.S., Tarasov, M., Otto, E., Yassin, G., Grimes, P. K., and Mauskopf, P. D.(2007): “Superconductive sub-Terahertz nanoswitch,” JETP Letters, vol. 86 no. 4 pp. 275-277.
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Experimental Cosmology Group Oxford Astrophysics
NbN Nanostrip Switch
I
V
RN
0
CriticalcurrentIc
NanostripNbN
NbN
2 µm
0.2 µm
RZLL gc <<<<+ 0ωω
SlR
eILSjI
cccc ρ=== ,
2,* h
gLRZ ω+<<0
90, 150, 220 GHz
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Experimental Cosmology Group Oxford Astrophysics
Devices fabricated at Chalmers
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Experimental Cosmology Group Oxford Astrophysics
DC Tests
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Experimental Cosmology Group Oxford Astrophysics
Detector Block for Phase switch RF tests
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Experimental Cosmology Group Oxford Astrophysics
RF Results see Kuzmin et al
-150000 -100000 -50000 0 50000 100000 150000-800
-600
-400
-200
0
200
400
600
800
Nanoswitch on quartzwafer NbN13 chip 430.8 µm
Cur
rent
, µA
Voltage, µV
B B
-1000 -500 0 500 1000-30
-20
-10
0
10
20
30
BWO V=1161
Cur
rent
, µA
Voltage, µV
Op Cl N
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Experimental Cosmology Group Oxford Astrophysics
Preliminary Results at oxford
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Experimental Cosmology Group Oxford Astrophysics
Phase Modulation work at Oxford…Cont
• Stage Three: Integrate nanostrip in microstrip: Designed
Hole in ground planeand dielectric layer
5 um
15 um
Transmission Line
Contact Pads
Nanostrip
Power received from horn with antipodal
finline
To detectorNonostrip in microstrip
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Experimental Cosmology Group Oxford Astrophysics
Potential detectors Used in CMB instruments
• SIS– Very high dynamic range and saturation power– Very fast response– Cheap readout– Easy to integrate with planar circuits– Can be used as a direct detector and a Mixer– Problem:
• Suppression of pair tunnelling• Shot noise
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Oxford AstrophysicsOxford Astrophysics
The Project
220-GHz Ultra-BroadBand INterferometer for S-Z – GUBBINS
• Single baseline interferometer at 190-260 GHz• 0.5m baseline, 0.4m primary mirrors (11’ primary beam) • 2x SIS mixers, designed for ultra-wide IF bandwidth• Single closed cycle cryostat• Single LO with phase switching in LO optical path• Very wideband IF system:
•Wideband, low noise IF amplifiers (initially 3-13 GHz, with upgrades intended) •2-20 GHz analogue sideband separating complex correlator with 16 spectral channels
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Oxford AstrophysicsOxford Astrophysics
Ultra-wideband SIS mixer
IF bandwidth 2-15 then extend to 20 GHz
Band pass filter to isolate the high IF frequency from the RF
Complex mixer tuning circuits
RF transformerGrimes et al, STT, Groningen
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Experimental Cosmology Group Oxford Astrophysics
New Finline Transition
Yassin, et al, Electron lett. (in press)
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Oxford AstrophysicsOxford Astrophysics
Mixer circuits
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Oxford AstrophysicsOxford Astrophysics
The Instrument – IF System
Commercial bias tees3-13 GHz cryogenic IF amps from CalTech (Sander Weinreb)
•35 dB gain, 4-6 K noise•Only need two for first version of GUBBINS, but later developments may need more (sideband separating mixers)