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KVI test experiment with existing RPC types
for NeuLAND
EXLEXL
RR33B and EXL Projects at FAIRB and EXL Projects at FAIR
• Reactions involving emission of projectile-like neutrons → high-energy neutron detector (300 MeV – 1 GeV)
NeuLAND Detector ConceptNeuLAND Detector Concept
Existing LAND detector:Existing LAND detector:• t < 250 ps• x,y,z ≈ 3 cm• Size: 2 x 2 x 1 m3
• Plastic scintillator / Fe converter sandwich structure
Compared to existing RPC types:Compared to existing RPC types:• Protons at various energies (non-MIPs)• Low count rates (< 1 Hz/cm2)• Massive detector for higher efficiency
NeuLAND design goals:NeuLAND design goals:• t < 100 ps• x,y,z ≈ 1 cm• Size : approx. 2 x 2 x 0.8 m3
• Efficiency > 90% for 1-n hits• Improvement of multi-n recognition
Th. Blaich et al., NIM A 314 (1992), 136
Timing RPC concept:Timing RPC concept:• Total of 140 m2 RPC• Approx. 10'000 channels• Converter material: integrated in
RPC structure
Neutron DetectionNeutron Detection
High-energy neutrons (500 MeV) on Fe → production of charged particles via nuclear reactions
• Main contribution: protons at various energies
• KVI Test: protons at 190 MeV, 120 MeV and 80 – 30 MeV→ investigation of time resolution for Ep < 200 MeV
R3B Technical Proposal; http://www-land.gsi.de/r3b
Timing RPC TypesTiming RPC Types
A. Schüttauf, NIM A 533 (2004), 65 spacers (300 m)
FOPI RPCFOPI RPC
avalanche gapsLIP-Coimbra test RPCLIP-Coimbra test RPC
H. Alvarez Pol et al., NIM A 535 (2004), 277
Test Experiment Setup at KVITest Experiment Setup at KVI
Proton beam
190, 120, 80-30 MeV
Scintillator detector 1, with Hamamatsu R2083 PMs → Trigger
Scintillator detector 2, with LAND PMs → Efficiency
LIP-Coimbra Test RPC
FOPI RPC
5 mm collimator
RPC Time Resolution: 120 MeV ProtonsRPC Time Resolution: 120 MeV Protons
FOPI RPC Efficiency > 90% (setup not optimized for efficiency measurements)
t = 42 ps
FOPI RPC; -9.5 kV; 100-140 p/sec
RPC Time Resolution: 120 MeV ProtonsRPC Time Resolution: 120 MeV Protons
Results for LIP-Coimbra RPC:• Results with FOPI electronics• Measured efficiency: nearly 100%
t = 87 ps
LIP-Coimbra RPC; +6.25 kV; 100-140 p/sec
with walk correction
RPC Time Resolution: 40 MeV ProtonsRPC Time Resolution: 40 MeV Protons
t = 52 ps
FOPI RPC; -9.5 kV; 150 p/sec
38 MeV
43 MeV t = 82 ps
LIP-Coimbra RPC; +6.25 kV; 170 p/sec
Conclusions and OutlookConclusions and Outlook
• Large detectors with high granularity can be built on RPC concept → offers excellent time resolution and cost-per-channel ratio
• Timing RPCs show good time resolutions for protons with Ep < 200 MeV, with measured efficiencies between 90% and 100%
→ Timing RPC prototype development:– Adapted geometry (size, anode structure)– Converter material integrated in RPC structure
GSI, Darmstadt:GSI, Darmstadt:K. Boretzky, K. Mahata, K. Hildenbrand, H. Johansson, T. Le Bleis, A. Schüttauf, H. Simon
Institut für Kernchemie, Uni Mainz:Institut für Kernchemie, Uni Mainz: D. Rossi
KVI, University of Groningen (NL):KVI, University of Groningen (NL):N. Kalantar, L. Popescu, C. Rigollet du Toit, M. Vencelj, H. Wörtche
LIP, Coimbra (P):LIP, Coimbra (P): A. Blanco, P. Fonte
SINP, Kolkata (IN):SINP, Kolkata (IN): U. Datta Pramanik
for the Rfor the R33B and EXL CollaborationsB and EXL Collaborations
List of participants
Thank you