1. 24-Apr-15S.Movchan Straw prototype beam test into the NA48 infrastructure 1 Goals: test of straw prototype wires positioning straw bending check grounding concept cross-talks study test 2 new front-end boards based on CARIOCA check TDC binning (1.2 ns/ch -?) DAQ (TELL-1 -?) straw spatial resolution and efficiency study straw rate test: total rate capability – up to 0.5 MHz per straw local rate capability – up to 30 kHz/cm 2 => 30 kHz per 1 cm of wire Gas mixtures: CO2/isoC4H10/CF4 (90:5:5) and Ar/CO2 (70:30) Thresholds: 6 fC, 12 fC Gas gain: 6·10 4 - 2·10 5 Beam: muons (straw resolution), pions (rates) Beam test 2010

2. Expected results

3. 24-Apr-153 Garfield + CARIOCA Th=10 fC Gas gain G=2x10**5 HOD trigger resolution: ~ 1.3 ns (instead 0.2 ns in 2008) Beam test CARIOCA Th=10 fC Gas gain G=2x10**5 R (cm) Resolution (cm) Residual (µm) straw resolution vs R Ar/CO2 CO2/isoC4H10/CF4

4. Beam test 2007

5. 24-Apr-155 R straw = 4.9 mm Beam test 2007

6. 24-Apr-15624-Apr-15 6 Straw rate capability study gas mixtures: - CO2/isoC4H10/CF4 (90:5:5) - base line - Ar/CO2 (70:30) Gas gains: - G=6x10**4 (Th=6 fC) - G=2x10**5 (Th=10 fC) Pion beam size: - FWHM ~ 4 mm

7. 24-Apr-157 Ar/CO2: straw rate capability study Straw residual vs beam rate for R ~4.45 mm (track: 6 hits in any 7 layers) 1515 13 13 1717 19 19 3 1 19 19 1717 1414 11 11 1818 21 21 5 2 21 21 1818 1010 7 2 25 25 9 6 25 252 9 6 2323 26 26 10 10 7 26 26 2323 5 2 2727 30 30 14 141 30 30 2727 3 1 29 29 31 31 15 15 13 13 31 31 29 29 Straw efficiency vs beam rate (track: 6 hits in the 6 first layers ch2≤2, straw in the 7-th layer – tested) 1 6767

8. 24-Apr-158 “track” efficiency vs beam intensity Pions Th=10 fC gas gain G=2x10**5 (HV=1850 V) “track”=N straws with hit in 8 layers ≥ 3 straws ≥ 4 straws ≥ 5 straws ≥ 6 straws “Eff.”=74% due to straws layout (gap between straws in the single layer is 1.2 mm) and narrow beam size (FWHM=4 mm) Ar/CO2: Pions Th=10 fC gas gain G=2x10**5 (HV=2600 V) “track”=N straws with hit in 8 layers CO2/isoC4H10/CF4 ≥ 3 straws ≥ 4 straws ≥ 5 straws ≥ 6 straws Pion beam position on straws is different respect to runs for Ar/CO2 gas mixture: due to this NO lost efficiency for “≥ 6 straws”

9. 24-Apr-159 Cross-talks study Cross-talk is about 4 % Ar/CO2 (70:30) Muons Th=10 fC gas gain G=2x10**5 (HV=1850 V) 1515 13 13 1717 19 19 31 19 19 1717 1414 11 11 1818 21 21 52 21 21 1818 1010 7 2 25 25 96 25 252 9 6 2323 26 26 10 10 7 26 26 2323 5 2 2727 30 30 14 141 30 30 2727 3 1 29 29 31 31 15 15 13 13 31 31 29 29 Straws # 6 5 4 3 2 1 Muon tracks taken for analysis Straw without anode wire