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Status of the Calorimeter Working
group activities
GSI, 16th October 2007
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NUSTAR CALORIMETER Working Group
Coordinator : D. Cortina
R3B (D.Cortina) / EXL (J.A. Scarpaci)
Created in : February 2005 after the NUSTAR collaboration
Goal: Find synergies between the different calorimeters in NUSTAR (R&D, Desing phase, but also common front to negociate with providers)
List : 41 members, 21 Institutions , 10 countries,
Meetings
- February 2005 GSI, Darmstadt (Germany)
- June 2005 Valencia (Spain)
- Informal meeting , September 2005, Orsay (France)
- September 2005 Santiago de Compostela (Spain)
- February 2006, IPN Orsay (France)
- September 2006, Krakow ( SPIRAL) *
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Last year activities
R3B/EXL collaboration working group, Milan October 2006
CWG meeting, Nustar week, GSI March 2007
Prototype definition videoconference, May 2007
CWG meeting, Lund June 2007
Working progress videoconference, September 2007
CWG meeting, GSI October 2007
www.usc.es/genp/r3b calorimeter
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Total absorption efficiency 80 % (Eg=15 MeV lab R3B)(Eg=2-4 MeV lab EXL)
Very large crystals
Eg sum s(Esum)/<Esum> <10%
g Multiplicity s(Ng)/<Ng> < 10%
DE/E for g 2-3 % @ 1 MeV Scintillation propertiesDetector granularity
DE/E for p (up to 300 MeV)Calorimeter for p
1 % Large crystalsDynamic range
Large dynamical range for detecting p,g
Inner radius ~ 30 cm ( house Si trackers)
UHV compatible for EXL
Affordable cost!!!
Technical Proposal (2005)
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Gammas are emitted with energies up to
Elab
= 3.2 ECM
(for β = 0.82 ~ 700 A. MeV)
✗ A huge crystal length is required for full energy absorption
The angular distribution of the emitted gammas is peaked in the forward direction.
✗ allows a certain optimization of the angular coverage
ECM
= 10 MeV(β = 0.82)
Experimental constraints
The forward angular region will be the most delicate part
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Calorimeter sectors
ECM = 10 MeV
β = 0.82
Angular distribution Doppler shift
BARREL
FORWARD
ENDCUP
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R&D working group activities
General design studies (R3B)
barrel: IPNO,USC
forward endcup: IPNO,USC
R&D on Crystals and photosensors
barrel: IPNO,USC, Lund
forward endcup: Madrid
Simulations (R3B)
full calorimeter : USC
partial : Lund, Madrid
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R&D working group activities
Mechanical structure
cell structure: IPNO,USC, TU-Vigo
general mechanical support NN
Prototypes
barrel: IPNO,USC, Lund
forward endcup: Madrid
Electronics NN
Slow control and monitorisation NN
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General design: R3B Calorimeter models (CAD)
v1.2 v4.0a
v4.0b v4.0c
USC, IPN
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General design: R3B Calorimeter models (CAD)
Inner radius 30 cm
Few crystal shapes
Garantees DE/E~ 3% (due to polar angular resolution)
H. Alvarez, USC
v5.0
Last accepted version for the barrel design
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Crystal and photosensors
!?
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Crystal and photosensors
BARREL
CsI(Tl) + PM IPNO
(0,0,0)
z
x
Beam axis14°
Target
1450mm
R3B Calorimeter
2.2T Magnet
~300 Gauss at PM level PROBLEM
Good energy resolution
Shielding needed to work with PM
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Crystal and photosensors
CsI(Tl) + LAAPD USC
Very good energy resolution
Variation of APD gain with temperature monitorization needed
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Crystal and photosensors
CsI(Tl) + PD LunD
Moderate energy resolution
Very high threshold problem to register low energy gammas
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Crystal and photosensors
CsI(Tl) + PD LunD
excelent energy resolution for 180 MeV protons
Huge contribution of nuclear interactions and multiple scattering
Uppsala, TSL, GWC, B-line (Blue hall): Energy 179.31±0.80 MeV.
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the estimated final energy is proportional to the energy deposited in each layer need to be proven from measurements and simulations
E Ë= f( D E1 ) + g( DE2 )
DE1
D E2
M.Turrion, O.Tengblad IEM
LaBr3(Ce) of 30 mm LaCl3(Ce) of 150 mm
Crystal and photosensors
Forward endcap
LaBr + PM not yet investigated
Two layer detectors IEM, Chalmers
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Calorimeter models (GEANT4)Detailed simulations
v1.2 v4.0a v4.0b
H.Alvarez USC
Allowed very valuable information - geometry efficiency and granularity - tracking algorithm tests etc etc….
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Barrel Prototypes
CsI(Tl) + LAAPD Hamamatsu 2x S8664-1010
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Realistic frustum-shaped crystals:
Lanzhou
Hilger
St. Gobain (France and India)
Scionix
LAAPDs Hamamatsu
2x(10x10) mm2
Materials
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Square PMT Photonis(1 per 2 crystals)
RectangularCrystals
Barrel Prototypes
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In 2008, construction of a prototype of 18 Xtals [CsI(Tl)] with 9 square PMT
•Simulation and Tests of the prototype with different thickness of material in between the crystals depending on mechanical and physics considerations.
Barrel Prototypes
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Time schedule (R3B)
Info from 2006 extension of ~ 1
years
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Conclusions
Good way towards the definition of the barrel design
CsI(Tl) + PM /LAAPD
First detectors (realistic size) will be mounted next weeks
Prototypes ready around summer 2008
Different facilities are considered to perform in beam test with these prototypes
Detection in forward sector is still a real challenge
We need to investigate in detail the proposed solutions and/or find alternatives
Urgent to address this problem within next year
Technical man power is needed
mechanical structure
electronics and slow-control is not yet addressed
We are lacking the support of big laboratories
Not yet urgent today but mandatory for the construction phase