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24-Apr-15S.Movchan Straw prototype beam test into the NA48 infrastructure 1 Goals: test of straw prototype wires positioning straw bending check grounding.

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Presentation on theme: "24-Apr-15S.Movchan Straw prototype beam test into the NA48 infrastructure 1 Goals: test of straw prototype wires positioning straw bending check grounding."— Presentation transcript:

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 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 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) Straw efficiency vs beam rate (track: 6 hits in the 6 first layers ch2≤2, straw in the 7-th layer – tested)

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) Straws # Muon tracks taken for analysis Straw without anode wire


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