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GIF++ cosmic and beam trigger system and Geant4 flux simulations

GIF++ cosmic and beam trigger system and Geant4 flux simulations. Dorothea Pfeiffer. GIF++ SBA Presentation 14 .03.2013. Flux simulations. Detailed study with FLUKA dose and flux simulations by Bart Biskup

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GIF++ cosmic and beam trigger system and Geant4 flux simulations

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  1. GIF++ cosmic and beam trigger systemand Geant4 flux simulations Dorothea Pfeiffer GIF++ SBA Presentation 14.03.2013

  2. Flux simulations • Detailed study with FLUKA dose and flux simulations by Bart Biskup (B. Biskup, "Studies for GIF++," CERN, 30 11 2011. [Online]. Available: http://indico.cern.ch/getFile.py/access?resId=1&materialId=1&confId=115583.) • Opening of angles upstream and downstream to +/- 37 degrees vertically and horizontally made recalculation necessary, since a lot more scattering occurs • Further the shielding request of the cosmic trigger and the beam trigger groups necessitated new simulations • After several iterations the flux for all chambers is at or under the requested maximum values Dorothea Pfeiffer

  3. GIF++ Geometry • Irradiator with lead filters • RPC chambers surrounded by 4 cm of steel • Floor chamber also covered by 17 cm of steel • Beam trigger shielded by 5mm Tungsten rubber • Roof chamber shielded by 2 cm lead plate in air Beam trigger Lead shield for roof chamber Irradiator with filter frame roof chamber Beam trigger Finetracking chamber floor chamber Steel floor (2 cm) Dorothea Pfeiffer

  4. GIF++ projection yz Average flux above source 4.7e5 s^-1 cm^ -2 roof chamber Lead shield steel plate fine tracker floor chamber

  5. GIF++ projection xz Downstream beam trigger: average flux 1.8 e4 s^-1 cm^ -2 Average flux 1.0 e5 s^-1 cm^ -2 roof chamber Upstream beam trigger: average flux 5.9 e4 s^-1 cm^ -2 Average flux 5.1 e5 s^-1 cm^ -2 Average flux 1.2 e3 s^-1 cm^ -2 floor chamber fine tracker

  6. Cosmic and beam trigger • Beam trigger uses 40 cm x 60 cm TGC quadruplets and will be used during muon beam time and when muon halo is available • Beam trigger uses 5 L of mixture of CO2 and flammable n-Pentane (heated stainless steel pipes needed -> n-Pentane liquid at room temperature) • Upgrade with larger chambers is foreseen to improve halo triggering and enable triggering of horizontal cosmics • Cosmic trigger uses RPCs and will be used for vertical to ~ 45 degree cosmics when beam or halo are not available • Gas mixture 95% C2H2F4. (tetrafluoroethane) and 5% C4H10 (isobutane) Dorothea Pfeiffer

  7. Cosmic triggger: top tracker • Trigger and high time resolution.   • 4 independent detectors area 1x0.5 m2. Gap structure to be finalized • strips 3 cm wide;   • The 1 m long strips (16 per read-out panel) in all 4 RPCs • 0.5 m long strips in 2 out of 4 chambers.   • # strips: 64 x 2 = 128 strips • Fine tracking.  • One or 2 RPC 30x30 cm2with 1 cm strips in both direction ( 32 strips vertically + 32 strips horizontally). Centroid reconstruction in both directions.  # strips: 64 Fine trackers 40 cm • Y-Z readout • Y only readout • Y-Z readout • Y only readout 30 cm 30 cm 100 cm 50 cm View from bottom Slide: courtesy G. Aielli

  8. Cosmic trigger: bottom tracker • Trigger and high time resolution: • One chamber 1x0.5 m2 as for the top tracker: strips: 16 + 32 = 48 • Fine tracking: 1 chamber 30x30 cm2 as in the previous point.  # strips: 64 • Underground detector • One doublet chambers:  size 2.8 x 2.4 (=2x1.2) m2  (two chambers; bi-dimensional read out with 40 mm strips. .  # strips: 224  (20 E/ channel) Fine tracker Y-Z readout Iron shielding 30 cm 50 cm Concrete 30 cm 100 cm Concrete 240 cm 280 cm Slide: courtesy G. Aielli

  9. Beam trigger: test beam setup sTGC quadruplets within the Mechanical frame. Allows to Adjust the quadruplet position Monitor chambers For external reference Needed to select parallel tracks Slide: courtesy G. Mikenberg

  10. Beam trigger: layout Slide: courtesy G. Mikenberg, Y. Benhammou

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