bolometer group
DESCRIPTION
Through the thorns to the stars! Igenom törnen mot stjärnorna! Через тернии к звездам !. Bolometer Group. Chalmers University of Technology, MC2. Superconducting Cold-Electron Bolometer with SIS´ and Josephson Tunnel Junctions and JFET Readout. Leonid Kuzmin. - PowerPoint PPT PresentationTRANSCRIPT
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Superconducting Cold-Electron Bolometer
with SIS´ and Josephson Tunnel Junctions
and JFET Readout
Leonid Kuzmin
Chalmers University of Technology, MC2Bolometer Group
LTD12, Paris - 2007
Through the thorns to the stars!Igenom törnen mot stjärnorna!
Через тернии к звездам!
In cooperation with: Rome University (Paolo de Bernardis) and Cardiff University (Phillip Mauskopf)
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Cosmic Microwave
Background (CMB)
radiation
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Cosmic Microwave Background (CMB) radiation
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BOOMERANG-3 - balloon telescopeMeasurements of the CMB Polarization
CEB for 350 GHz, 90 channels, CHALMERS is the only provider!
CEB for 150 GHz, 9 channels (old JPL bolometers available)
• The BOOMERANG2 telescope hanging from the NASA Delta launch vehicle, ready for launch.
January 2003
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The He3 refrigerator for BOOMERANG detectors from the temperature of
at 0.3 K
Focal plane
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Balloon telescope BOOMERANG
• Channel II: 350 GHz
• Background Power load : P0 = 5 pW
• Photon noise:
• Total NEP of bolometer should be less than photon noise: NEPtot < NEPphot.
• Polarization rezolution > 40dB
• Launch - 2009
2/1/1710*5*0
2 HzWhfPphotNEP
From Paolo de Bernardis, March 29, 2007, Rome
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Cold-Electron Bolometer (CEB) with Capacitive Coupling to the Antenna Kuzmin – ISSTT-98
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Noise characterization of the CEB I. Agulo, L. Kuzmin, and M. Tarasov
Room T amplifier - AD743
Power load – 20 fW
100 10000
1
2
3
4
5
6 Theory Tot NEP Amp NEP Bol NEP
NE
P (
10-1
8 W/H
z1/2 )
frequency (Hz)
Experiment Tot NEP Amp NEP Bol NEP
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Optimal CEB with an SIN Tunnel Junction and Andreev SN Contact Kuzmin – ISSTT, Paris 2006
SN-NIS
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Superconducting Cold-Electron Bolometer (SCEB) with SIS´ and Josephson Tunnel Junctions and JFET readout for BOOMERanG Balloon
Telescope
SIS´-S´IS
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4 SCEBs with JFET readout for each polarization component
- Circle waveguide is coupled to 4 coplanar lines- 2 opposite coplanar lines are combined for one readout for polarization measurements
HF part is similar to “SCEB for OLIMPO”L. Kuzmin, P. Mauskopf and D. Golubev,EUCAS-2005
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Cold-Electron Bolometer Noise2222ampSINphetotal NEPNEPNEPNEP
,2
22
I
ampamp
S
INEP
22
22 2
P
S
IP
S
INEP
II
SIN
phephe GkTNEP 22 4
P
ISI
NEPe-ph2 = 10 kBV (Tph
6 + Te6)
(Jochum et al. – 1998)
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JFET amplifier noise
,2
22
I
ampamp
S
INEP
22
222
f
d
NNamp I
R
VII
In
R f
R d
Vb ia s
C E B
Vn
,/10 2/1HzfAIN ,/3 2/1HznVVN
,300 kRd
kfA
nV
I
VR
N
NN 300
10
3We need matching with
We need
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NEP for 4 SCEBs with JFET readout
NEPtot < NEPphot S=1 m2
R=0.5 kOhm,
Vol=0.02m3,
T=300 mK
IJFET=10 fA/Hz1/2
VJFET=3 nV/Hz1/2
Power load = 5 pW @ 350 GHzSIS´: Tc1=1.2K, Tc2=0.5K
0
1 10-17
2 10-17
3 10-17
4 10-17
5 10-17
100 120 140 160 180 200 2200
10
20
30
40
50
Voltage, V
NEPtot
NEPphot
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350 GHz . NEP for 4 SCEBs with JFET readout
NEPtot < NEPphot S=1 m2
R=0.5 kOhm,
Vol=0.02m3,
T=300 mK
IJFET=10 fA/Hz1/2
VJFET=3 nV/Hz1/2
Power load = 5 pWSIS´: Tc1=1.2K, Tc2=0.5K
0
1 10-17
2 10-17
3 10-17
4 10-17
5 10-17
10
12
14
16
18
100 120 140 160 180 200 220Voltage, V
NEPtot
NEPampNEP
e-ph
NEPSIS´
NEPphot
Current
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Dependence of NEP components on volume of the superconducting absorber
Total NEP < NEPphot S=1 m2
R=0.5 kOhm,
Vol=(0.01-0.16)m3,
T=300 mK
IJFET=10 fA/Hz1/2
VJFET=3 nV/Hz1/2
350 GHz . Power load = 5 pW
0
1 10-17
2 10-17
3 10-17
4 10-17
5 10-17
0 0.05 0.1 0.15
Volume, m3
NEPtot
NEPSIS´
NEPe-ph
NEPamp
NEPphot
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Cascade Quasiparticle AmplifierU 0 2 eV
I
Ib
EF
U 0 2 eV
E F
Iq
eV
/2 60 0e V300 GHz
I F
eV
EF
S
I
IJF E TV
SIS ´ tu nn el jun ction :C -cou p lin g to an ten n a ,th erm al iso la tion ,P m easurem en ts &elec tron coo ling
W e ak sup er co nd u ctinga b so r be r (T i)
S
A n ten n a
Josep h son SIS ´ju nction:
Ic -cou plin g to an ten nath erm al iso la tion ,d c b ias of SIS´ jun ction
e -hIq
I = Ib + Iq
Ib
´
5.1´*1
I
IqIK
L. Kuzmin, Physica C. 372, 457 (2002)
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Superconducting Cold-Electron Bolometer with SIS´
& Josephson Junctions for BOOMERanGLeonid Kuzmin, Paola Feodino, Katarina Olsson, Michael Tarasov, Nassar
Abusitta, Ernst Otto, Phillip Mauskopf, Paolo de Bernardis
LTD12, Paris - 2007
Chalmers University, Rome University and Cardiff University
Planar Si substrate
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Conclusions
New generation of detectors is needed to measure polarization of Cosmic Microwave Background
BOOMERanG: 350 GHz, P0=10pW, JFET readout, photon noise sensitivity & high polarization rezolution
Superconducting Cold-Electron Bolometer with SIS´ and Josephson junctions – the most effective and reliable decision