Berendes, R.

Bergmann, C.

Bonaventura, D.

Emschermann, D.

Hehner, J.

Heine, N.

Kolipost, B.

Verhoeven, W.

Wessels, J. P.

GSI Repository

Test of Mu¨nster CBM TRD prototypes at the CERN PS/T9 beam line ∗C. Bergmann1, R. Berendes1, D. Bonaventura1, D. Emschermann1, N. Heine1, J. Hehner2,B. Kolipost1, W. Verhoeven1, and J. P. Wessels11Institut fu¨r Kernphysik, Mu¨nster, Germany; 2GSI, Darmstadt, GermanyThe Mu¨nster real-size CBM TRD prototypes [1] of59 × 59 cm2 shown in Fig. 1 are derived from the designof the ALICE TRD modules. An ampliﬁcation region of3.5+3.5 mm is combined with a 5 mm drift section lead-ing an active gas volume thickness of 12 mm. Signals areinduced on rectangular pads of 7.125 mm width, respec-tively, to allow for charge collection on 3 adjacent pads.This design corresponds to the smallest module size nextto the beam-pipe, required for 12% of the total CBM TRDarea, and is scalable to 1 m2-size detector modules.Figure 1: Mu¨nster TRD protoypes in the CBM beam test.Various radiator types were investigated on these 3 TRDprototypes during the common CBM beam test [2] in2012. The read-out was performed with the SPADIC v0.3 /Susibo [3], SPADICv1.0 [4] and FASP [5] front-ends. Thesetup was entirely EPICS controlled, allowing for onlinemonitoring of the HV settings, gas ﬂow and inclusion ofthese values in the DAQ stream. First results of the ongo-ing analysis are shown in Figure 2. One important aspectof radiator choice is to match of the TR-emission spec-trum with respect to the absorption spectrum of the de-tector. For a detailed investigation, we have built differ-ent radiator types: regular foil and irregular foam, ﬁberand sandwiches. Ideally, a radiator should yield an opti-mal TR-performance, while keeping the material budgetas low as possible. While this consideration favors regu-lar foil radiators, they usually require a signiﬁcant externalsupport frame to keep the foils stretched and in position.This additional frame material is avoided in our ﬁrst micro-structured self-supporting radiators (Kshort, K, K++). Firstresults using self-supporting radiators type K (Fig. 3) arepromising and comparable to the classical radiator type Bwith the same properties made from the identical material.∗Work supported by BMBF and the HadronPhysics3 project ﬁnancedby EU-FP7.dE/dx [keV]0 10 20 30 40 50 60 70normalized counts-510-410-310-210-110Figure 2: ADC spectra for π (black) and e (red), integratedand calibrated, on the 2nd TRD operated with Xe/CO2(80:20) gas in combination with 350 foil layer micro-structured self-supporting radiator (K++) at 3 GeV/c.Number of detector layer2 4 6 8 10 12Pionefficiency[%]-210-110110210MS_N_II, radiator: K++, p=3GeV/c, 12mm XeCO (80:20)Figure 3: Extrapolated pion efﬁciency for a TRD consist-ing of up to 10 layers for micro-structured self-supportingradiator (K++). The dashed line indicates the design goalof 1% π efﬁciency, at 90% e efﬁciency which is reached inthis conﬁguration with 6 layers.References[1] D. Emschermann et al. “Development and CbmRoot imple-mentation of the Mu¨nster CBMTRD prototypes 2012”, CBMProgress Report 2012[2] D. Emschermann et al., “Common CBM beam test of theRICH, TRD and TOF subsystems at the CERN PS T9 beam-line in 2012”, this report[3] T. Armbruster et al.,“CBM-TRD readout with the SPADICampliﬁer / digitizer chip”, CBM Progress Report 2010[4] T. Armbruster et al.,“SPADIC 1.0 - a Self-triggered Ampli-ﬁer/Digitizer ASIC for CBM-TRD”, this report[5] V. Catanescu et al., “Front End Electronics for High CountingRate TRD using a prototype ASIC”, CBM Progress Report2009PHN-NQM-EXP-33 GSI SCIENTIFIC REPORT 201262

Test of Münster CBM TRD prototypes at the CERN PS/T9 beam line

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Test of Münster CBM TRD prototypes at the CERN PS/T9 beam line

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