Rf backgrounds on tof1 2
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RF backgrounds on TOF1/2. M. Bonesini INFN Milano Bicocca. MICE setup: cooling + diagnostics. Cools and measures about 100 muons/s. RF background: yet another problem. RF cavities produce electron due to field emission converted to x-rays in absorbers

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RF backgrounds on TOF1/2

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RF backgrounds on TOF1/2

M. Bonesini

INFN Milano Bicocca

M. Bonesini - CM19 RAL 7/10/2007


MICE setup: cooling + diagnostics

Cools and measures about 100 muons/s

M. Bonesini - CM19 RAL 7/10/2007


RF background: yet another problem

  • RF cavities produce electron due to field emission

    • converted to x-rays in absorbers

    • causing backgrounds in trackers and TOF stations

    • in phase with muons we want (peak at RF crest)

  • Emission rate rises very steeply with electric field and magnetic field (1.5-2.5 t at MICE cavity location)

  • test problem with MTA setup at FNAL

  • rates: ~26KHz/cm2 for 8 MV/m at B=0 at 4.5 m f rom RF cavity, with energy deposit ~ 400-600 KeV (for a MIP ~5 MeV)

Fiber tracker

M. Bonesini - CM19 RAL 7/10/2007


From BTF testbeam

ADC spectrum in

logarithmic scale

Selection of single electron events

Part of the same spectrum in linear scale

Here we will have backgrounds signal: problem is to estimate rate

M. Bonesini - CM19 RAL 7/10/2007


Back of the envelope calculation (CRAY MP inside)

  • Use Rykard MC estimation for tracker (MICE note): e- 4.4 KHz, g 1.8 MHz

  • But TOF1 or TOF2 is further downstream and thus rate/counter will be probably reduced

  • I guess with a suitable pedestal cut we will have no problems, but well a G4MICE simulation ( see Rykard note # 90) may be useful

  • MIP signal ~300-400 mV, this background is 15 times less in energy, so a -40 mV cut on LE discriminator may be enough

M. Bonesini - CM19 RAL 7/10/2007


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