NeuLAND - FAIR

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200 AMeV, Erel = 100 keV emitted % 1n 2n 3n 4n 1n 49 25 12 4 2n 24 31 22 12 3n 7 23 25 20 4n 1 12 21 22 5n 0 4 12 19 6n 0 1 5 12 7n 0 0 2 7 8n 0 0 1 3 9n 0 0 0 1 reconstructed 1000 AMeV, Erel = 100 keV emitted % 1n 2n 3n 4n 1n 62 25 8 2 2n 25 39 24 11 3n 4 26 33 25 4n 0 8 23 29 5n 0 1 10 20 6n 0 0 2 10 7n 0 0 0 3 Table B.1.: Simulated multi-neutron hit capability for the MRPC-based neutron detector with 50 layers, with the reconstruction algorithm described in the text. Left side, 200 AMeV. Right side, 1000 AMeV. See figure B.9 for the underlying multiplicity spectrum for 1000 AMeV. B.6. Further MRPC Prototype and Offline Tests The MRPC prototype SINP1 of size 40 cm × 20 cm has segmented anode strips, each strip being 40 cm long and 2 cm wide (figure B.10). The anode strips are made of PCB with a thin layer of gold coating and are thus almost converter free. The cathode plates were made by introducing a thin layer of conducting material on 1 mm thick float glass. The detector structure was housed in an aluminium chamber. Further details of the design can be found in Ref. [Dat-10]. The detector volume of 1000 cm 3 was continuously flushed with a gas mixture of 89% R134a, 4% sulfur hexafluoride (SF6) and 7% isobutane. The response of the prototype has been studied extensively using cosmic-ray muons, in coincidence with a fast inorganic scintillator detector, Cerium doped Lanthanum Bromide (LaBr3:Ce). For the design as neutron detector we want to keep converter material above and below the MRPC detector. List mode data of the MRPC and LaBr3:Ce signals were taken corresponding for cosmic-ray muons and γ-rays. The master trigger for the data acquisition was produced by a logical AND of time signals from the MRPC and LaBr3:Ce detectors. Figure B.10 shows the TAC spectra of the MRPC in coincidence with the LaBr3:Ce detector. The time resolution of the MRPC was measured to be σt = 150±31 ps without slew correction. The time resolutions of the LaBr3:Ce detector and electronics were 120 and 35 ps, respectively. The same prototype was also studied with the ELBE pulsed electron beam. At ELBE, after a specially designed slew correction a time resolution of σt = 92±3 ps was obtained. All the above mentioned values for the time resolution correspond to experimental parameters for which an absolute detection efficiency of more than 90% was obtained for 110 reconstructed
counts 500 400 300 200 100 1000 AMeV, 100 keV, 35m, 2x2x1.2 1n 2n 3n 4n 0 0 20 40 60 80 100 multiplicity Figure B.9.: Monte Carlo simulations of the MRPC-based neutron detector prototype. Multiplicity spectrum for one selected case (neutrons impinging at 1000 MeV/A, Erel = 100 keV). Multi Strip Anode Plate Glass epoxy Float glass Gas gap Signal Cathode (ESD coated) Figure B.10.: MRPC prototype SINP1. Left panel: Sectional view. Right panel: TAC spectra of the prototype in coincidence with a LaBr3:Ce detector. The solid line shows the data for cosmic-ray muons, the dashed line for 60 Co γ-rays. minimum ionizing particles. Further details are presented in Ref. [Dat-10]. 111
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FAIR/NUSTAR/R 3 B/TDR NeuLAND Techn
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Germany EMMI and FIAS: Enrico Fiori
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INR Moscow: Alexander Botvina Russi
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Contents Executive Summary 11 1. In
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B.7. MRPC Solution using Glass as C
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Apart from the excellent energy res
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processes in the universe, such as
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decaying into 24 O plus 4 neutrons
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2. Physics Scenarios: Requirements
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e studied at R 3 B at FAIR include
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all theoretical calculations predic
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at the surface of the nucleus. The
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the evolution of fission channels (
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3. Summary of NeuLAND Prototype Res
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counts 70 60 50 40 30 20 10 0 15 15
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Figure 3.4.: Shown is the time reso
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4. Monte Carlo Simulations Within t
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normalized counts normalized counts
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GEANT3 interface. Here, we compare
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Counts 1000 900 800 700 600 500 400
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counts 5 10 4 10 3 10 2 10 10 LAND
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incident neutron fully active detec
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investigated. Three values for the
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spectrum, absorption length, refrac
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Counts 600 500 400 300 200 100 with
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Since, as discussed above, several
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events 800 600 400 200 0 0 200 400
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clusters N 100 50 0 0 500 1000 1500
Page 59 and 60: In the following section we discuss
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Page 63 and 64: events 2000 1500 1000 500 σ = 15 k
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Page 71 and 72: Figure 5.6.: Detector frame with fi
Page 73 and 74: 5.4. Peripheral Systems 5.4.1. Read
Page 75 and 76: Figure 5.12.: The photo shows the T
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Page 83 and 84: Figure 8.3.: ToF distribution in 10
Page 85: Figure 8.4.: Event display for seve
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Page 94 and 95: The timeline for milestone 1 includ
Page 96 and 97: 96 2. Sample Tests Random samples o
Page 98 and 99: PNPI St. Petersburg: G.D. Alkhazov,
Page 100 and 101: HV 1.$ mm 2$ mm 0+$1-2)-2'.%/ 5%4'.
Page 102 and 103: Beamline Be exit window P 6 P 3 P 4
Page 104 and 105: B.3. Design Issues Addressed with 4
Page 106 and 107: Time [ns] Counts 41 40 39 2200 2000
Page 108 and 109: Efficiency 100 80 60 40 20 0 7.5 8
Page 112 and 113: B.7. MRPC Solution using Glass as C
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Page 116 and 117: [Bot-04] S. Botvina andI.N. Mishust
Page 118 and 119: [Lip-03] C. Lippmann, PhD Thesis, U
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NeuLAND - FAIR

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