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1 Cosmic Rate Overview 17.07.2007 Rustem DZHELYADIN (CERN&IHEP, Protvino) The Set-up: Scintillating counters HV setting Coincidence adjustment Accidentals.

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Presentation on theme: "1 Cosmic Rate Overview 17.07.2007 Rustem DZHELYADIN (CERN&IHEP, Protvino) The Set-up: Scintillating counters HV setting Coincidence adjustment Accidentals."— Presentation transcript:

1 1 Cosmic Rate Overview 17.07.2007 Rustem DZHELYADIN (CERN&IHEP, Protvino) The Set-up: Scintillating counters HV setting Coincidence adjustment Accidentals rate The Vertical Rate measurement: on Surface in Cavern The Horizontal Rate measurement: Showers suppression in Cavern center in between HCAL halves in muon filter Results interpretation

2 2 Cosmic Rate The Set-up 17.07.2007 Rustem DZHELYADIN (CERN&IHEP, Protvino) 2 scintillating counters WxL=20x60 cm 2 used for μ–trigger at beam-test PMT (FEU-118, 2” diameter, low noise) NIM crate: discriminator LeCroy 620AL, 31mV thr., 30 ns shaping coincidence LeCroy 465, 30 ns shaping scalers CAEN N145 HV supply CAEN N472 (U max =2kV, I max =3mA) 2 standard CERN delay units 63,5+3 ns in 0.5 ns steps VETO counter WxL=14x100 cm 2

3 3 Cosmic Rate The HV selection 17.07.2007 Rustem DZHELYADIN (CERN&IHEP, Protvino) HV 1 = 1,8 kV HV 2 = 1,8 kVHV 3 = 1,85 kV HV1=1,80 kV HV2=1,75 kV All measurements done with cosmic at surface S1*S2*S3/S1*S2

4 4 Cosmic Rate Vertical integrated flux 17.07.2007 Rustem DZHELYADIN (CERN&IHEP, Protvino) S1 S2 At surface R s =175.1 Hz/m 2 With 5 cm lead on top R sPb =151.2 Hz/m 2 At sea level: 1 count/min/cm 2 =167 Hz/m 2 (CERN is ~400 m above) In cavern 4 2 1 3 R 1 =3.3 Hz/m 2 R 2 =1.9 Hz/m 2 R 3 =1.4 Hz/m 2 R 4 =0.9 Hz/m 2 Under HCAL

5 5 Cosmic Rate Vertical differential flux 17.07.2007 Rustem DZHELYADIN (CERN&IHEP, Protvino) S1 S2 At surface I s =102.4 Hz/m 2 /sr In cavern 2 I 2 =0.72 Hz/m 2 /sr 109 S1 S2

6 6 Cosmic Rate Accidental coincidence rate 17.07.2007 Rustem DZHELYADIN (CERN&IHEP, Protvino) Single counter rate (after shaper) was permanently recorded (N 1, N 2 ) 1.Accidental Rate evaluated : N acc = 2  N 1 N 2  = 30 ns (shaping time) 2.Accidental Rate measurement:  T N acc = S1 (delay 155 ns) x S2  T – measurement time Shaping time was chosen 30 ns to exclude counters signal jitter at distances ≤ 2m ( ± 10 ns ) Typical single counter Rate was N ~ 30-100 Hz Both measurements coincide within statistical error

7 7 Cosmic Rate Set-up modification 17.07.2007 Rustem DZHELYADIN (CERN&IHEP, Protvino) S1 S2 A3 Rates are lower: a VETO counter ( A3) used to suppress  -showers A3 S1*S2

8 8 Cosmic Rate Set-up modification 17.07.2007 Rustem DZHELYADIN (CERN&IHEP, Protvino) S1 A3 10 4 2.5 Geometry allow particle to cross S1 and S2 without VETO at distances as low as 40 cm between S1 – S2 Measurements done within range D = 40.5 ÷ 182.7 cm

9 9 Cosmic Rate Angle definition 17.07.2007 Rustem DZHELYADIN (CERN&IHEP, Protvino) θyθy (All flux) = 3 x (Trigger condition) D

10 10 Cosmic Rate Semi-horizontal flux 17.07.2007 Rustem DZHELYADIN (CERN&IHEP, Protvino) 123 Similarity trigger condition X Y 1 – 2x2 outer 2 – 2x2 inner or 2x1 outer 3 – 2x1 inner - between HCAL halves - around μ-shielding (very preliminary) S1S2 It looks like in air soft μ - dominating flux due to multiple scattering (?) Surface, m 2 inner = 15.17 outer = 41.93

11 11 Cosmic Rate Summary 17.07.2007 Rustem DZHELYADIN (CERN&IHEP, Protvino) Counting rate per day (86 400 s) in HCAL: N inner = 0.016 Hz/m 2 x 15 m 2 x 8.610 4 = 210 4 N outer = 0.050 Hz/m 2 x 40 m 2 x 8.610 4 = 1710 4 weak muons N inner = 0.0009 Hz/m 2 x 15 m 2 x 8.610 4 = 1.210 3 strong muons N outer = 0.0046 Hz/m 2 x 40 m 2 x 8.610 4 = 1610 3 Extrapolation according to Sin 3 (Θ y ) … to be measured, checked for muon showers, …

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