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

RF backgrounds on TOF1/2

M. Bonesini

INFN Milano Bicocca

M. Bonesini - CM19 RAL 7/10/2007


Mice setup cooling diagnostics

MICE setup: cooling + diagnostics

Cools and measures about 100 muons/s

M. Bonesini - CM19 RAL 7/10/2007


Rf background yet another problem

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

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

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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