ASTROGAM Calorimeter: detector and FEE

ASTROGAM Calorimeter:
detector and FEE
Martino Marisaldi – INAF IASF Bologna
1st ASTROGAM Workshop, Roma 09-10 Dec. 2013
Compton telescopes
2 interaction positions +
time-of-flight
COMPTEL
Redundant photon
interaction position
(removes direction
ambiguity)
NCT, LXeGRIT,
Most ACT concepts
Electron tracking
MEGA, TIGRE, GRIPS
ASTROGAM
Credits: Andreas Zoglauer PhD Thesis
09/12/14
M. Marisaldi - ASTROGAM WS Rome
2
Compton kinematics 1
What we need:
Must measure with the
highest precision direction
and energy of the recoil
electron and scattered g
What we want:
Credits: Andreas Zoglauer PhD Thesis
09/12/14
M. Marisaldi - ASTROGAM WS Rome
3
Compton kinematics 2
If I don’t know anything of the recoil electron direction:
Credits: Andreas Zoglauer PhD Thesis
09/12/14
M. Marisaldi - ASTROGAM WS Rome
4
Angular resolution
2 MeV g
Recoil electron only
09/12/14
Scattered gamma-ray only
Credits: Andreas Zoglauer PhD Thesis
Angular resolution depends on the accuracy of energy measurement for e- and g
5
Angular resolution requirements pose constraints on energy resolution
M. Marisaldi - ASTROGAM WS Rome
The ingredients:
•
•
•
•
high-Z absorber (CsI(Tl), LaBr3…)
Low-noise photodetector
Low-noise front-end electronics
Few mm position resolution: tradeoff pixel
size vs. power consumption / complexity.
09/12/14
M. Marisaldi - ASTROGAM WS Rome
6
Need for low-noise photodetector
and low-noise front-end electronics
~300 e- rms
a 1/E
a 1/E1/2
~30 e- rms
Fiorini et al. TNS (2006)
09/12/14
M. Marisaldi - ASTROGAM WS Rome
7
Silicon Drift Detector – Basic Principle
M. Marisaldi - ASTROGAM WS Rome
8
SDD development and applications in Italy:
the INFN XDXL and ReDSoX R&D projects
Technology
Science
06/11/2013
M. Marisaldi - ASTROMEV @APC Paris
9
Post-ALICE SDD development @ INFN & FBK
ALICE
(2002)
INFN &
Canberra
ALI2
(2010-11)
INFN & FBK
XDXL-1
(2011-12)
INFN & FBK
XDXL-2
(end-2012)
Proof of Concept
Shift to FBK
low-E improvement,
low-power, humidty,
..
INFN
Large pitch Trieste
Design
145 mm
& 970 mm pitch
INFN & FBK
R. Campana et al. Imaging performance of a large-area
Silicon- ASTROGAM
Drift Detector
for X-ray astronomy NIM-A 633 (2011) 22
M. Marisaldi
WS Rome
10
Very Low Noise front-end electronics
VEGA ASIC (design by Politecnico Mi & Uni PV, production by AMS 0.35mm MPW):
Low-noise low-power mixed signal ASIC for SDD readout
Optimized for high resolution X-ray spectroscopy
< 15 e- RMS
For each channel:
•pre-amplifier: <15 e- RMS
•shaping amplifier
•discriminator
•peak and hold
•channel tuning (thr, on/off, etc)
• power consumption: 418 mW/ch
M. Ahangarianabhari et al., IWORID 2013, to be submitted to Journal of Instrumentations
M. Marisaldi - ASTROMEV @APC Paris
11
Silicon Drift Detectors coupled to
CsI(Tl) scintillators
SDD array (MEGA chip) by PNSensor gmbh (ASI – funded R&D, <2009)
 SDD single elements and array by INFN / FBK (INFN / INAF funded R&D)

12000
X-ray spectrum
55
Fe
10000
06/11/2013
counts
C. Labanti et al., SPIE Proc. 2008
F. Perotti et al., SPIE Proc. 2008
8000
6000
FWHM = 260 eV
4000
2000
FWHM = 270 eV
0
4
5
6
7
8
Energy (keV)
800
g-ray spectrum
137
Cs
counts
600
400
FWHM = 6.2%
200
0
0
M. Marisaldi - ASTROMEV @APC Paris
100
200
300
400
Energy (keV)
500
600
700
12
800
Architectures for space g-ray calorimeters
INTEGRAL IBIS/PICsIT @INAF IASFBO
AGILE MCAL @INAF IASFBO
09/12/14
M. Marisaldi - ASTROGAM WS Rome
13
Hodoscopic architecture
Light attenuation
1200
1000
ch (AU)
800
600
PD
400
200
0
-7.5
PD A
x=
-6
-4.5
-3
-1.5
0
cm
æu ö
ln çç (0,A) ÷÷ - Da L
è u(0,B) ø
_
2a
+
1.5
3
4.5
6
7.5
æ U B - OB ö
ln
ç
÷
_
U
O
è
A
Aø
2a
1
PD B
_
a
E=
AGILE MCAL heritage
09/12/14
M. Marisaldi - ASTROGAM WS Rome
e
L
2
u(0,A) × u(0,B)
eDa x (U A - OA )(U B - OB )
14
Position resolution
AGILE-MCAL: 39 cm Csi(Tl) bar + PIN PD
14 mm @1.3MeV – 7 mm @ ~10 MeV
Labanti et al., NIM A (2009)
120
100
9 cm Csi(Tl) bar + single SDD
3.5 mm @ 0.662 MeV
a. u.
80
Labanti et al., IEEE NSS Conf. Rec. (2008)
60
40
20
0
09/12/14
-80
-40
M. Marisaldi - ASTROGAM WS Rome
0
mm
40
80
15
A modular approach
SDD 2x2 array
Credits: F. Fuschino - UniBo
Wrappaed CsI(Tl) bars
09/12/14
M. Marisaldi - ASTROGAM WS Rome
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A modular approach
Wrappaed CsI(Tl) bars
Credits: F. Fuschino - UniBo
09/12/14
To back-end electronics
By flex cables
M. Marisaldi - ASTROGAM WS Rome
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Summary
• Bottom CAL for ASTROGAM: 2D matrix of CsI(Tl) bars
with double-side SDD readout
• SDD by INFN + FBK + INAF IASF Bo & IAPS Roma
• Possible contribution to FEE by Poli.Mi and Uni. Pv. IDEFiX
by CEA can work as well. Both need minor R&D.
• Not so many degrees of freedom (to be fixed by
simulations / constraints):
– Size? Si tracker size: 50 - 60 cm
– Thickness? 5 cm: 81 kg CsI, 4 cm: 65 kg
– Pixel size? Baseline 5mm  2x14400 ch for 60cm side.
<0.5mW/ch  15W FEE + buffer power
09/12/14
M. Marisaldi - ASTROGAM WS Rome
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