Status report on RPC FEB production Status report on RPC Distribution Board Interfaces RPC-LB
KVI test experiment with existing RPC types for NeuLAND.
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Transcript of KVI test experiment with existing RPC types for NeuLAND.
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