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Shielding EMCal-KL planes

Shielding EMCal-KL planes. D.Orestano on behalf of L.Tortora MICE CM 8/10/06. D0 measurements. D0 note 3593 (1999): V.Bezzubov et al. “Magnetic shielding studies for FEU115M phototube of the FAMUS pixel counters” 2 layers of magnetic shield surrounding the 90mm long PM

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Shielding EMCal-KL planes

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  1. Shielding EMCal-KL planes D.Orestano on behalf of L.Tortora MICE CM 8/10/06

  2. D0 measurements • D0 note 3593 (1999): V.Bezzubov et al. “Magnetic shielding studies for FEU115M phototube of the FAMUS pixel counters” • 2 layers of magnetic shield surrounding the 90mm long PM • Inner layer: m metal, 1.2mm thick, outer Ø33.4 mm, 116mm long • Outer layer: soft steel, 6mm thick, outer Ø42 mm, 118mm long OR Ø48 mm (and presumably 9mm thick)

  3. D0 measurements No effect from transverse field observed up to 700 G Ø48 mm Longitudinal field effect reduced increasing the thickness of the soft steel shield Ø42 mm 6mm thick soft steel longitudinal

  4. D0 measurements(slide added on 9/10/06)

  5. D0 measurements(slide added on 9/10/06)

  6. KL 70 mm thick Fe C40 with 34 mm Ø holes 13mm thick shield • metal cylinders 34 mm Ø

  7. Old drawing: PMs are now 21 in groups of 3

  8. Towards a constructive design of EMcal D.Orestano on behalf of L.Tortora MICE CM 8/10/06

  9. Towards a constructive design of EMcal ( mostly cut & paste from Rikard and Jean-Sebastien on transversal sizes, placing & shielding and fee readout ) • Calorimeter design has been tailored for special MICE conditions ( KL layer & SW planes option) • KL : 80 x 80 cm2 is a suitable size • KL : 90 x 90 cm2 is a fail safe size • Calorimeter close to TOF2 = better PID • KL should capture any muons which are hitting TOF2 • the “split design” option of EMcal should easily allow it; a sandwich made of TOF2A&KL can stay in a 10-12 cm gap between 1st and 2nd iron shield • important by products : • minimum material in front of KL • straight off work on mechanical support and B shielding • drawback : larger SW ? • may be not … it stays anyway after 2nd iron shield

  10. Iron shield holes • larger hole = less effective shielding • larger TOF2 (48x48  64x64) cm2= less BT field at PMT position • but marginally effective on BR • but, mainly, worse time resolution due to scintillators length; TOF2A & KL to be evaluated wrt TOF2A & TOF2B • Readout • various options have been carefully examined and presented by JSG: commercial flash ADC and TDC seem to be the preferred one; • to finalize the complete readout chain, lab test are needed first; • problems which have to be matter of dedicated technical discussion : • HA 2624-11 voltage divider requires impedance adapter which causes undershoot of shaped signal to be sampled by FADC; • anode capacitor which worsens the rise time of the output signal; • remove adapter (and splitter) to improve time resolution ? • “ad hoc” RC-shaper? • change voltage dividers ? • all other choices (discriminator type, ADC type, TDC) do not show specific technical problems but the fund availability

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