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Trigger, GEM and Medipix at H8

Trigger, GEM and Medipix at H8. Roma and Frascati Team Daniele Mirarchi CERN & Roma1 univ . “ Sapienza ”. Planar GEM. Complete apparatus (Jun 2010). TPC GEM. Medipix. p Beam. Scintillators. Trigger. Coincidence from pair of plastic scintillators after tracking system.

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Trigger, GEM and Medipix at H8

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  1. Trigger, GEM and Medipix at H8 Roma and Frascati Team Daniele Mirarchi CERN & Roma1 univ. “Sapienza”

  2. Planar GEM Complete apparatus (Jun 2010) TPC GEM Medipix p Beam Scintillators Daniele Mirarchi, UA9 Workshop

  3. Trigger Coincidence from pair of plastic scintillators after tracking system. Active area of 10x10 cm2. Gated over spill signal. Efficiency ~1 checked by H8 line scintillators. Trigger number in onespill~1.3·106 ~30KHz Out of the spill~1Hz Daniele Mirarchi, UA9 Workshop

  4. TPC-GEM Anode: 5×5 cm2 16×8 pads, 3×6 mm2 Electronics: readout (CARIOCA-GEM) + thresholds + HV supplies cathode p Beam Triple-GEM 128 LVDS outputs from CARIOCA-GEM to TDC (V1190 CAEN) for drift time measurement Daniele Mirarchi, UA9 Workshop

  5. TPC-GEM Measurementofdriftvelocity, essentialfortracksreconstruction Drift gap Take runwithoutchanneling: pads tmax t0 Knowledgeofdrift gap Vdrift=1.34cm/μs Daniele Mirarchi, UA9 Workshop

  6. TPC-GEM mm Residual=zextrap – t*vdrift Pad number Residual for all pads Daniele Mirarchi, UA9 Workshop

  7. TPC-GEM Residual vs. pad number Fit Gaussian for each pad After 4 iteration Correct drift distance with average residual, and fit again Daniele Mirarchi, UA9 Workshop

  8. TPC-GEM Run without channeling Residual distribution for one pad :115μm Run with channeling Mean distribution of 8 pads time along the track. Separation between peaks ~3.6mm Distance from crystal ~50m Deflection angle ~72μrad (exp 70μrad) Daniele Mirarchi, UA9 Workshop

  9. Planar GEM Anode: 5×5 cm2 16×8 pads, 3×6 mm2 Electronics: readout (CARIOCA-GEM) + thresholds + HV supplies p Beam Mounted on a railforstudying the inelasticinteractions on the crystal Daniele Mirarchi, UA9 Workshop

  10. Medipix Medipix2 Silicon detectors 256×256pixels, 55 mm pitch • Maximum acquisition rate • via USB interface: few Hz • Record 1 frame/4 sec, read • back in LabVIEW & profile • fitting Daniele Mirarchi, UA9 Workshop

  11. Medipix Handy device - To find crystal position with respect to the beam: Simply by seeing the beam squeeze, since multiple scattering reduces when beam no longer hits the crystal-holder frame (transverse position scan) Daniele Mirarchi, UA9 Workshop

  12. Medipix • Handy device • To find channelingangle (fast angular scan) • Even volume reflection! Daniele Mirarchi, UA9 Workshop

  13. Medipix calibration Calibration factor calculated by Medipix counts/Scintillators counts in one spill. • Strongly dependence from threshold: • Need characterization of Medipix in SPS for a better estimation of • collimation efficency Daniele Mirarchi, UA9 Workshop

  14. Conclusions • Scintillatorsworkswell, and makeverygood trigger signal. • TPC-GEM isabletoseechanneling and tracksreconstructionwithgood • resolution (115μm). Usefulforionsrun. • Planar GEM work well, butisnotyetanalyzed. • Medipixisveryhandydevice. • It’s veryusefulfor: • Fast searchof the beamwithcrystal. • Fast angularscanforsearchingchanneling angle. • Can alsosee the Volume Reflectioneffect. Daniele Mirarchi, UA9 Workshop

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