Centre of Excellence
HCRTRD prototypes
Single-sided first HCRTRD
- type: radiator + MWPC;
- anode-cathode distance - 3mm;
-  2.5 mm anode pitch;
- maximum drift time ~ 100 ns;
- channel size ~ 6 cm2.
Goal of the experiment: detector performance in high counting rate environment
The signal doesn't decrease significantly up to 100 kHz/cm2; the configuration with split anode seems to have a better behaviour;
The position resolution at low rate is ~350 µm; the observed degradation for higher rate is smaller than 50 µm;
The first prototype HCRTRD were tested in-beam in July 2004 @ GSI Darmstadt
Double-sided pad plane HCRTRD
Goal: to increase the conversion efficiency of the TR in one layer conserving the rate performance and the number of the readout channels of the first prototype .
Solution: mirrored MWPC relative to a common double sided pad-plane electrode.
High Efficiency TRD for High Counting Rate Environment

The first: the double -sided pad readout electrode has been madefrom PCB of 250 µm thickness.
The second: the single -pad readout electrode made from mylar foil of 3 µm thickness, aluminized on both sides.

The third: the double -sided pad readout electrode made from kapton foil of 25 µm, covered with copper on both sides.
First results from in-Beam Tests @ SIS, GSI-Darmstadt
Double-sided split pad TRD
The prototype consists of two individual multiwire proportional chambers (MWPC) that share a thin common central readout electrode. The rectangular pads of the previous prototypes were split on diagonal for position determination in both coordinates: across and along the pads, respectively. Measurements with X-ray sources showed a very good energy and position resolutions. These results open the possibility of constructing large TRD arrays for high counting rate experiments with a reasonable number of layers and very good two-dimension position information.
First prototype version
Second prototype version
- 3 mm anode-cathode distance
- 3 mm anode wire pitch
Readout electrode
PCB, 300 µm thickness
- 3(4) mm anode-cathode distance
- 3 mm anode wire pitch
Readout electrode
Cr(20 nm)/Al(200nm) on 25 µm kapton foil
Read-out electrode -
pad geometry
Single-sided split pad TRD
The obtained energy resolution @ 55Fe source for each of them was very good.
The position reconstruction in both x and y direction using 238Pu X-ray source was demonstrated.
} first in-beam combined test
The in-beam test :
       - excellent in-beam test conditions @ PS-CERN
       - very good coordination of the in-beam test
       - preliminary results show an excellent e/
p discrimination « based on both:
       - detector architecture
       - FASP - FEE               
2 Scintillatorarrays (ToF, trigger): each array - 4 scintillatorpaddles
    (4 x 1 x 0.5 cm3each)
2 Si -Strip Detectors (beam profile)
Cherenkov detector + Pb-glass calorimeter•FADC readout ; DAQ
Readout electrode: PCB, 300 µm thickness
4 mm anode-cathode distance
4 mm drift distance
3 mm anode wire pitch
1.5 mm cathode wire pitch