Amend, W.

Appelshäuser, H.

Arend, A.

Blume, C.

Dillensenger, P.

Gläßel, S.

Roether, F.

Tanha, M.

GSI Repository

Construction and test of a new CBM-TRD prototype in Frankfurt ∗M. Tanha, W. Amend, H. Appelsha¨user, A. Arend, A. Arend, C. Blume, P. Dillenseger, S. Gla¨ßel, andF. RoetherInstitut fu¨r Kernphysik, Goethe-Universita¨t Frankfurt, GermanyA new TRD prototype based on a thin Multi Wire Pro-portional Chamber (MWPC) without a drift region andwith carbon frame was designed at the Institute for Nu-clear Physics in Frankfurt (IKF) and tested in the test beamat CERN-PS in November 2014. According to this de-sign, two identical real-size prototypes in outer dimen-sions of 586 × 580 × 38.5 mm3 were developed with apitch of 2.5 mm between field and sense wires. Cathode(field) wires made of Cu-Be with a diameter of 80 µm areplaced between gold-plated tungsten anode (sense) wireswith a diameter of 20 µm. The gas gap region, distancebetween entrance window and pad-plane, is 3.5+3.5 mm(see Fig. 1). The chamber were build with the same type ofpad-plane as used in the prototypes from Mu¨nster [1].Figure 1: Schematic drawing of alternating wires, theirpitch and diameters.Applying cathode wires with alternating HV (alternatingwires) has an improving result as it reduces the effect of adeformation of the cathode plane by about a factor of 6,which distorts the gas gain inside the detector via electricfield deformation [2].The MWPC with thin and symmetric geometry(3.5+3.5 mm) provides fast signal collection and effi-cient e/pi separation, which is desired in the CBM exper-iment [3]. The carbon frame, instead of an aluminium orvetronit frame, provides optimum mechanical properties,low thermal expansion, high friction resistance and lowmaterial budget. Figure 2 shows the technical drawing ofthe prototype with the aforementioned components.Figure 3 shows the gas feed-through that is embeddedinside the frame in the corners. Thus, it meets the structuralconditions of the TRD chambers, which will have to bemounted close to each other in the final setup.The data from the CERN-PS test beam in November2014 are currently being analysed. The development of a∗Work supported by BMBF, HIC4FAIR and HGShire.Figure 2: Technical drawing of a TRD prototype with al-ternating wires and carbon frame.Figure 3: The gas feed-through inside the frame.large size (1.0 × 1.0 m2) prototype of the TRD is plannedat the IKF.References[1] C. Bergmann et al., “Test of Mu¨nster CBM-TRD real-sizedetector and radiator prototypes at the CERN PS/T9 beamline”, CBM Progress Report 2014.[2] S. Gla¨ßel, CBM Progress Report 2013, p. 70.[3] E. Hellba¨r, CBM Progress Report 2012, p. 54.GSI SCIENTIFIC REPORT 2014 MU-NQM-CBM-53DOI:10.15120/GR-2015-1-MU-NQM-CBM-53 91

Construction and test of a new CBM-TRD prototype in Frankfurt

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Construction and test of a new CBM-TRD prototype in Frankfurt

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