NeuLAND - FAIR

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B.7. MRPC Solution using Glass as Converter As an alternative, a new concept for the detection of high energy neutrons based on RPC’s was also proposed. This concept considers only glass as converter material. There is no iron in the whole detector. Based on a modular geometry, each RPC module contains a certain number of glass electrodes separated by 300 µm, operated in a standard gas mixture. The gas gaps are encapsulated in a gas tight plastic box, which only contains feed-throughs for the active gas (a standard mixture of 90% freon and 10% SF6) and the high voltage. The readout strips are allocated outside the plastic box. The whole system is electrically isolated by a metallic shielding. Based on simulation studies using the R 3 BROOT framework, the thickness of the glass plates has been chosen to be 3 mm [Mac-11]. A schematic view of the iron-less RPC concept is shown in the left panel of figure B.11. A RPC module (100 cm × 50 cm) based on the iron-less RPC concept already exists at LIP-Coimbra, and it can be seen in the right panel of figure B.11. Metallic shielding Figure B.11.: Schematic drawing (left) and photograph (right) of the iron-less RPC module with the readout electrodes. A number of up to 8 modules with dimensions 200 × 50 cm is presently under construction at LIP-Coimbra. The performance of this new concept in the detection of high energy neutrons will be tested during the allocated deuteron break-up experiment at the R 3 B setup during 2012. B.8. Summary and Outlook The development of the MRPC option for NeuLAND provided many valuable insights. One of the largest area MRPC structures ever built was developed for the purpose, and it was unambiguosly shown that the structure will even work as an MRPC in its strongly modified form using thick passive converters. The first MRPC-based neutron detector we are aware of has been built, and it was shown that an MRPC-based detection concept can work for 1 GeV neutrons. Also, the Neutron MRPC development for NeuLAND was an important driver in the development 112
of the single-electron capability at the ELBE accelerator, which can henceforth be used for detector tests for many different detectors as a kind of benchmark. The MRPC-based design was not adopted for building NeuLAND because of the much superior performance of the pure scintillator based approach. However, it should not be seen as a failed development effort, and it is presently under study whether this detection concept can be applied in a different setting, where no multi-neutron hit capability is demanded. 113
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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
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In the following section we discuss
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Page 73 and 74: 5.4. Peripheral Systems 5.4.1. Read
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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 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 110 and 111: 200 AMeV, Erel = 100 keV emitted %
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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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