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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 systemand Geant4 flux simulations Dorothea Pfeiffer GIF++ SBA Presentation 14.03.2013
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
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
GIF++ projection yz Average flux above source 4.7e5 s^-1 cm^ -2 roof chamber Lead shield steel plate fine tracker floor chamber
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
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
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
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
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
Beam trigger: layout Slide: courtesy G. Mikenberg, Y. Benhammou