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Application of Michelson type bolometric interferometer to CMB B mode polarization observations. Makoto Hattori Astronomical Institute Tohoku University. Contents. Merit of interferometer for E ・ B mode separation and for minimizing contamination of instrumental polarization - PowerPoint PPT Presentation
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1
2008/3/13Application of Michelson type
bolometric interferometer to
CMB B mode polarization observationsMakoto HattoriAstronomical Institute
Tohoku UniversityKEK
2
Contents Merit of interferometer for E ・ B mode separation
and for minimizing contamination of instrumental polarization
Demerit of interferometer with heterodyne receiver for CMB B mode experiments.
Bolometric interferometer as ideal instrument for B mode experiments.
Propose an B mode experiment with Michelson type bolometric interferometer.
Summary & bit about Akari/FIS all sky survey
2008/3/13
KEK
3
Single dish imaging obs. VS interferometer:E ・ B separation
)2,2(,),(
,)(),( )(22
vukbvu
eIdvuV yvxui
2008/3/13
KEK
Single dish:ex. PLANCK
Interferometer: ex. DASI
Fourier Spectrum of I, Q,U, V are observed variables
RR ,
R
4
E ・ B separation by interferometer2008/3/13
KEK
Stokes parameters
)2cos(),2cos(
22
11
taEtaE
y
x
sin2,cos2
,
,
21
21
22
21
22
21
12
aaVaaU
aaQ
aaI
In Fourier space:locally separable
)2cos()(ˆ)2sin()(ˆ)( ll lUlQlB
X
y
)( kl
l
宇宙創世記 :prove inflational universe and nature of DE by B mode obs..
6
Instrumental Polarization in Single dish (Hu etal. (2003))Pauli matrix expansion ofP matrix
2131 VUQIEEP †
cccc
ccccinobs a
aJJPJP
12
21. 2
221,)1()1(
†
Instrumental Jones matrix
aVUQIVVaUQIUVUaQIQ
iii
i
i
12
12
21
22
2
2008/3/13
KEK
Monopole leakage due to cross polar mixing is significant
6
0
10TTB
7
mMmM
')(
Don’t do
mTry to measure directly
by Prof.A.Suzuki
Do not have to worry about Monopole leakage in interferometer
aVUQIVVaUQIUVUaQIQ
iii
i
i
12
12
21
22
2
2008/3/13
KEK
210
TT
TI
B
8
CMB vs foreground2008/3/13
KEK
Thermal emission from dust
Atmospheric emission
Quantum limit of heterodyne receiver
Synchrotron
Free-free
ΔT
mode
frequency
inte
nsity Cosmic window
@70GHz
Atmospheric window@90GHz
9
Interferometer with heterodyne receivers is not suitable to B mode observations
21)2(4/1 t
hht
GHzKht
507.22/12
2008/3/13
KEK
Quantum limit of heterodyne receiver since it performs coherent detection
realistically
GHzKh
207.23
Nosie level is Quantum limit limited around cosmic window
Construction of large element interferometer is practically hard. One receiver is mounted on focal plane of one telescope.
DASI
10
CMB power spectrum2008/3/13
KEK
11
Explosive improvement of sensitivity ofsingle dish obs. due to emergence of large format TES bolometer array
2008/3/13
SPT 330 elements
Not quantum limit limited since incoherent detection
12
Interferometer with bolometer is the ideal coupling: bolometric interferometer
2008/3/13
It shares the both merit of interferometer and bolometerFiseau type Michelson type
13
Application of Fiseau type : EPIC
2008/3/13
KEK
Timbie et al (2006)
-=
Adding type interferometer
Fringe
Baseline fluctuation
Data
14
Merit of Michelson type VS Fiseau type• Multiplying type bolometric interferometer is able to
realize.• Broad band spectroscopy is possible: advantagious
component separation of foreground and CMB is possible.• Mathematical basis of the instruments are fully explored.
2008/3/13
KEK
Path finder@NAOJ
The moon interferogram
Intrenal light path difference
Luo, Ohta, Hattori, Chinone, et al. (2008in preparation)
70GHz 170GHz
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Problem in application of Michelson type to CMB B mode experimentD
b D<bRequired baseline length b=10cm@90GHz for l=100
• Low power of light collection• Hard to mount massive detector array• Lowest observable l is limited by D.
2008/3/13
KEK
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New Michelson type bolometric interferometer satisfies D>b: MuFTPol
2008/3/13
KEK
Ex
EyD
b
TelescopeDET1,2,3,4=Ex()Ey=U±VDET5,6,7,8=(Ex+Ey)(Ex-Ey)=Q±V
Ohta, Hattori, Matsuo(2006,2007), Ohta et al. (2008 in prep.)
Hattori, Ohta, Koga(2008 in preparation)HarryBotte
xy
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Observed variables of MuFTPol
)(2sin)()(2cos)(
)()()(21 )2()1(2
uVuU
AAddDD
VQDDVQDD
VUDDbc
u
87,65
,43,
2008/3/13
KEK
)(2sin)()(2cos)(
)()()(43 )2()1(2
uVuU
AAddDD
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E ・ B mode separation by MuFTPol
)'(2sin)'()'(2cos)'(
)'()'(')( )2()1(2
uVuU
AAddI nmnmnm
bc
u
以下 0),()()( )2()1()12( VAAA
''20
0')12(
'02
22/02/0
))'((sinc
)'()'('
)(),(
ui
nm
inmnm
e
UAdd
eIduJ
),( mnnm
))'((sinc)2(ˆ)2(ˆ'21
))'(sinc()2sin(
))2(2/sin()2sin(
))2(2/(sin
)(ˆ)2(ˆ'21
''''
'
'
'
'
''*
'22/12/
2/12/
2/12/
2/12/
uUukAd
vkvkM
ukukN
kUukAkddJ
y
y
x
x
Nn
N
M
Mnm
n
m
2008/3/13
KEK
N×M pixel detector array
19
E ・ B mode separation by MuFTPol
22
22
222
22
2 )(,)( sCcCuQcCsCuU Bu
Eu
Bu
Eu
GHzlcmb
100@40030
Base line vector // x directionSum up 10×10 pixels data
Eu
Bu
Bu
CC
CuUs
22
222
01.0when
)(01.0
2008/3/13
KEK
The B mode are measured by direct observed varibales of DET1,2,3,4.
20
Detector:8 set of 10×10TES array
2008/3/13
KEK
Operation temperature:300mKNEP ~ a few Time constant ~ msec Spider web and TES are going to be fabricated by MEMS at Esasi Labo. in Tohoku UniversitySQUID time domain mutiplexing: cooperation of Prof.K.Irwin, NIST (USA)Any cooperations are very helpful and collaborations are very welcome.
5.017 /10 HzW
21
Observational site1st session: Summit of Mt.Fuji
2nd session Balloon 60 - 300GH z with Δν=10GHz
2008/3/13
KEK
Sekimoto et al. (1996)
80-100Gz with Δν=10GHz1.4m telescope 0<b<40cm variable
22
Sensitivity of 1st session MuFT
sec10
:10/5
int
t
NS
2008/3/13
KEK
23
SummaryWe propose Michelson type bolometric
interferometer which is able relax D< b constraint
Application of this instrument to CMB B mode experiment is orthogonal to other projects, eg. B mode is the direct observable, minimizing instrumental polarization.
Summit of Mt.Fuji is atractive site for CMB experiment
By applying it to balloon born or space born mission, super broad band observation is possible which mazimize component separation of FG and CMB
2008/3/13
KEK
24
2008/3/13To improve physical prior information of dust componentsAll sky diffuse map making @60, 100, 160μ
with Akari/FIS all sky survey data (Doi (Univ.Tokyo),Etxaluuze Azkonaga, M., Figueredo, E., White, G. (Open University),Chinone, Hattori (Tohoku University) 、 Nakagawa (JAXA) Akari team)
IRAS: 12,25,60, 100μm, 2’@100μm
KEK
0.75’@160μ
25
2008/3/13
KEK
CMB 実験グループの立ち上げおめでとうございます。若い研究者に QUIET ・Polarbear のデータにさわる機会を作って頂きありがとうございます。日本が CMB 観測の歴史に一つでも足跡を残すことに、微力ながら手助けができれば幸いです。
26
Sensitivity of 1st session MuFT
sec10
:10/5
int
t
NS
2008/3/13
KEK
27
mm-wave sky –Foreground=CMB
-
=
23GHz
33GHz
41GHz
60GHz
93GHz
2008/3/13
KEK
Synchrotron
Dust emission
Free-free
Synchrotron and dust are significantly polarized
28
Cross Polarization mixing in MuFTPol
0.2%@100GHz
2008/3/13
KEK Cro
ss p
olar
izatio
n tra
nsm
itanc
e of
wire
grid
%
29
MuFT 仕様Ground base observationΦ1.4m ナスミス焦点望遠鏡ベースライン間隔 :0<b<40cm 可変帯域 80 - 100 GHz・周波数分解能10G Hz10×10 TESボロメータアレイ ×8 セット( NEP ~数 ×E-17 W/√Hz, τ ~ 1msec)機械式冷却目的:l~ 200-400 の重力レンズ起源 B モードパワースペクトル測定
当面
将来大気球帯域 40 - 300GH z
2008/2/20
理研仙台
30
Option
)(2cos
)()()(21 )2()1(2
uEE
AAddDD
yx
errorzeropath todueerror path :
U+V のみ測定デメリット: Δδ の補正時の情報が減る
メリット: cross polarization mixing が防げる。光学系が簡略化
2008/2/20
理研仙台
31
MuFT pathfinder@NROJ
世界で初めて積算型ボロメトリック天体干渉計の実現に成功
月の観測データ(ルオ 2007)
2008/2/20
理研仙台
32
Nasmis focus at Az-El telescope
2008/2/20
理研仙台
33
E and B mode polarization
,0
U
QP
0
2
22
yx
yx
D
0 EPD
E map must satisfy
0 BPD
2008/3/13
KEK
Stokes parameters
)2cos(),2cos(
22
11
taEtaE
y
x
sin2,cos2
,
,
21
21
22
21
22
21
12
aaVaaU
aaQ
aaI
B map mustsatisfy
Polarization vector
)0( E
)0( B
34
E ・ B mode separation
)2cos()(ˆ)2sin()(ˆ)( ll lUlQlB
In Real space:whole sky P map is neccessary Mapon Polarizati Measured:P
0)(),()( xGDxxGD BB
)'()'(')( 2 xPxxGxdx BB
In Fourier space:locally separable
2008/3/13
KEK
BB DP ,0,0
X
y
)( kl
l
B modeE mode