The calorimeter CALIFA for R3B at FAIR - GSI WWW-WIN
The calorimeter CALIFA for R3B at FAIR - GSI WWW-WIN
The calorimeter CALIFA for R3B at FAIR - GSI WWW-WIN
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<strong>The</strong> <strong>calorimeter</strong> <strong>CALIFA</strong><br />
<strong>for</strong> R 3 B <strong>at</strong> <strong>FAIR</strong><br />
Thorsten Kröll (TU Darmstadt)<br />
<strong>for</strong> the <strong>calorimeter</strong> working group<br />
Work <strong>at</strong> TUD supported by BMBF (Nr. 06 DA 9040I) and LOEWE / HIC <strong>for</strong> <strong>FAIR</strong>
R 3 B - Kinem<strong>at</strong>ically complete measurement of<br />
Reactions with Rel<strong>at</strong>ivistic Radioactive Beams<br />
• E1 strength distribution studied by Coulomb excit<strong>at</strong>ion<br />
• Single particle properties: quasi-free sc<strong>at</strong>tering and knockout reactions<br />
• Structure of unbound nuclei, nuclear astrophysics, …<br />
• Low-momentum transfer programme … complements EXL<br />
<strong>CALIFA</strong><br />
GLAD<br />
LENA<br />
(see C. Langer‘s talk)<br />
R 3 B – universal set-up<br />
February 9-10, 2011 | HIC <strong>for</strong> <strong>FAIR</strong> - PB5 Workshop, Darmstadtium | Thorsten Kröll | IKP, TUD | 2<br />
NeuLAND<br />
(see K. Boretzky‘s talk)
<strong>CALIFA</strong> @ R 3 B<br />
<strong>CALIFA</strong> -<br />
Calorimeter (and spectrometer)<br />
<strong>for</strong> γ-rays and protons<br />
• sum energy as well as individual<br />
particles or γ-rays<br />
• large dynamic range:<br />
50 keV to 300 MeV<br />
Technical implement<strong>at</strong>ion based<br />
on scintill<strong>at</strong>ion detectors<br />
February 9-10, 2011 | HIC <strong>for</strong> <strong>FAIR</strong> - PB5 Workshop, Darmstadtium | Thorsten Kröll | IKP, TUD | 3
<strong>CALIFA</strong> – Barrel and Forward Endcap<br />
Large Doppler effects<br />
… tiling with small slabs<br />
Barrel<br />
February 9-10, 2011 | HIC <strong>for</strong> <strong>FAIR</strong> - PB5 Workshop, Darmstadtium | Thorsten Kröll | IKP, TUD | 4<br />
Forward<br />
Endcap<br />
D. Cortina,<br />
H. Alvarez et al.<br />
USC
<strong>CALIFA</strong> Barrel v7.07<br />
CsI(Tl) crystals<br />
Alveolus<br />
300 μm wrapping<br />
300 μm carbon fibre<br />
February 9-10, 2011 | HIC <strong>for</strong> <strong>FAIR</strong> - PB5 Workshop, Darmstadtium | Thorsten Kröll | IKP, TUD | 5<br />
H. Alvarez Pol<br />
et al., USC
GEANT4 Simul<strong>at</strong>ion of Barrel (I)<br />
β = 0.82<br />
non-uni<strong>for</strong>mity: 1%<br />
intrinsic resolution:<br />
5% @ 1 MeV<br />
threshold: 50 keV<br />
February 9-10, 2011 | HIC <strong>for</strong> <strong>FAIR</strong> - PB5 Workshop, Darmstadtium | Thorsten Kröll | IKP, TUD | 6<br />
mult = 1<br />
sum over ALL crystals<br />
simple „hit finder“<br />
H. Alvarez Pol<br />
et al., USC
GEANT4 Simul<strong>at</strong>ion of Barrel (II)<br />
β = 0.82<br />
non-uni<strong>for</strong>mity: 1%<br />
intrinsic resolution:<br />
5% @ 1 MeV<br />
threshold: 50 keV<br />
simple „hit finder“<br />
February 9-10, 2011 | HIC <strong>for</strong> <strong>FAIR</strong> - PB5 Workshop, Darmstadtium | Thorsten Kröll | IKP, TUD | 7<br />
mult = 1<br />
sum over ALL crystals<br />
Protons:<br />
ε full energy = 45 - 80%<br />
H. Alvarez Pol et al., USC
Crystals, polishing, wrapping, …<br />
Under investig<strong>at</strong>ion:<br />
• Manufacturers: AMCRYS, IMP Lanzhou<br />
• Linearity of light output<br />
• Non-uni<strong>for</strong>mity of light output<br />
(< 1%, up to ± 2.5% observed)<br />
• Wrapping<br />
• Readout: PMT, PD, APD, …<br />
February 9-10, 2011 | HIC <strong>for</strong> <strong>FAIR</strong> - PB5 Workshop, Darmstadtium | Thorsten Kröll | IKP, TUD | 8<br />
13 cm<br />
USC, Lund<br />
CSIC/IEM
APDs<br />
New 2 10x10 mm 2<br />
LAAPD<br />
(USC - Hamam<strong>at</strong>su)<br />
New LARSAPD<br />
10x10 mm 2 and 10x20 mm 2<br />
(University of Texas and TUM)<br />
February 9-10, 2011 | HIC <strong>for</strong> <strong>FAIR</strong> - PB5 Workshop, Darmstadtium | Thorsten Kröll | IKP, TUD | 9<br />
E γ = 662 keV<br />
O. Tengblad<br />
(IEM/CSIC) et al.
CsI(Tl) (Barrel) <strong>at</strong> NEPTUN @ S-DALINAC<br />
Photon-Tagger NEPTUN D. Savran et al., NIM A 613, 232 (2010)<br />
double escape<br />
511 keV<br />
single escape<br />
full energy<br />
L. Schnorrenberger et al. (TUD)<br />
February 9-10, 2011 | HIC <strong>for</strong> <strong>FAIR</strong> - PB5 Workshop, Darmstadtium | Thorsten Kröll | IKP, TUD | 10<br />
SFB 634
Proton detection: in-beam tests<br />
… <strong>at</strong> several energies: <strong>GSI</strong>, Uppsala, TUM, KVI<br />
E p = 180 MeV<br />
(Lund)<br />
E p = 21 MeV<br />
PID by PSA<br />
R. Gernhäuser<br />
et al. (TUM)<br />
EXL demonstr<strong>at</strong>or, E p = 135 MeV<br />
see M. von Schmid‘s talk<br />
(TUD, <strong>GSI</strong>, KVI, Orsay …)<br />
February 9-10, 2011 | HIC <strong>for</strong> <strong>FAIR</strong> - PB5 Workshop, Darmstadtium | Thorsten Kröll | IKP, TUD | 11
Electronics<br />
• Gain stabilis<strong>at</strong>ion of APDs<br />
(Mesytec & TUM, IEM/CSIC, TUD)<br />
T: 10°C 23°C<br />
• Dynamic range problem:<br />
ΔE=10 keV <strong>at</strong> 100 keV 5 keV/bin<br />
BUT: 200 MeV would need a 40k peak sensing ADC … not existing<br />
Possible solutions:<br />
- 2 parallel chains with different sensitivities … expensive<br />
- logarithmic preamp … hard to calibr<strong>at</strong>e<br />
- digital system with TOT (time-over-threshold)<br />
… very promising! R. Gernhäuser et al. (TUM)<br />
February 9-10, 2011 | HIC <strong>for</strong> <strong>FAIR</strong> - PB5 Workshop, Darmstadtium | Thorsten Kröll | IKP, TUD | 12
Front Endcap<br />
Large Doppler effect<br />
• Higher γ-ray energies<br />
• Lorentz boost<br />
• CsI or LaBr 3 /LaCl 3 ?<br />
• Phoswich solutions?<br />
• No PMT because of GLAD<br />
APD readout of LaBr 3<br />
(or SiPM, see also A. Ign<strong>at</strong>ov‘s talk)<br />
February 9-10, 2011 | HIC <strong>for</strong> <strong>FAIR</strong> - PB5 Workshop, Darmstadtium | Thorsten Kröll | IKP, TUD | 13<br />
E γ = 662 keV<br />
… by pulse shape analysis!<br />
O. Tengblad<br />
(IEM/CSIC) et al.
Protons on phoswich of LaBr 3 /LaCl 3<br />
February 9-10, 2011 | HIC <strong>for</strong> <strong>FAIR</strong> - PB5 Workshop, Darmstadtium | Thorsten Kröll | IKP, TUD | 14<br />
O. Tengblad (IEM/CSIC)<br />
et al., Göteborg, …
Mechanical Design<br />
February 9-10, 2011 | HIC <strong>for</strong> <strong>FAIR</strong> - PB5 Workshop, Darmstadtium | Thorsten Kröll | IKP, TUD | 15<br />
USC, U de Vigo
<strong>CALIFA</strong> 20% Demonstr<strong>at</strong>or<br />
• Modular design<br />
• Goal: 8 „petals“ with 20 alveoli each<br />
• Crystals and APDs reusable <strong>for</strong> <strong>CALIFA</strong><br />
February 9-10, 2011 | HIC <strong>for</strong> <strong>FAIR</strong> - PB5 Workshop, Darmstadtium | Thorsten Kröll | IKP, TUD | 16<br />
Altern<strong>at</strong>ive<br />
configur<strong>at</strong>ion<br />
USC, U de Vigo
Summary and Outlook<br />
• Barrel more or less fixed<br />
- TDR <strong>for</strong> barrel by the end of 2011<br />
- Construction of 20% demonstr<strong>at</strong>or<br />
- Per<strong>for</strong>m first physics programme<br />
• Forward Endcap … still a lot work to do!<br />
February 9-10, 2011 | HIC <strong>for</strong> <strong>FAIR</strong> - PB5 Workshop, Darmstadtium | Thorsten Kröll | IKP, TUD | 17
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