AMU project - observing muons
A prototype of a portable muon telescope was built along March to July of 2014 for muon flux measurements.
Muons are continuously produced on proton-air interactions being carried down with a bunch of other charged and neutral particles
in the so-called, air shower.
The work proposed here is to simulate within the LRCsim ROOT based framework the telescope setup, operate it and compare the
real data with simulations.
Flux measurements should show that the muon fluxes depend on the zenith angle, on air pressure and on muon absorption prior
to its detection.
The detector is composed of three scintilators of 20X20 cm coupled to wavelength shifter optical fibers (WLS) and
multi proportional photoelectron counters (MPPC).
The main part to develop on this semester is the readout electronics and the LabRC simulation.
The former will allow to test the already built prototypes and the later it will be used for estimating the magnitude
of signal to observe.
Electronics to develop
The idea is to develop electronics able to:
- power supply providing +5V, -5V and ground
- power up the light detector (silicon PM) through the ISEG DC/DC converter
- front-end electronics that will receive the signal from the silicon
PM, do its amplification and discrimination
- digital electronics FPGA based to handle the signal coincidences and signal
- computer station to run a simple acquisition system working as DAQ
server (ethernet, wireles, etc connections)
Related Electronics biblio
We intend to use the beaglebone board as acquisition server and event builder. After some discussion with Renaud Gaglione (LAPP) it seems that the signals from the Front-End electronics could be converted (TTL-CMOS) and a AND gate used to produce a signal to be gathered by GPIO. This implies to develop a beagleborad plugin board...
power: a power transformer and the DC/DC converter (Nov, 2014)
status (20 May 2014)
- scintillator plates were were cutted and polished, grooves for fibers made in LIP Coimbra workshop
- DC/DC converter received
- Hamamatsu MPPC ordered
- optical cement from Saint Gobain: quotation asked
- Scintillator gent4 setup simulation (going on)
- electronics: analog and digital (going on)
- boxes (design)
- telescope mechanical structrure (design)
optical photons readout: wls fibers
The WLS fibers being used are the ones from Kuraray that were also used in the Atlas experiment (green fibers): Y-11(200)
- double cladding
- diameter: 1mm
- absorption length (probability to absorb photon): 0.1mm for all wavelengths
- refractive indexes:
- core (polystyrene): n = 1.59, rho=1.05 g/cm2
- inner cladding (polymethylmethacrylate): n=1.49, rho=1.19 g/cm2
- outer cladding (fluorinated polymer): n=1.42, rho=1.43 g/cm2
- plastic scintillator EJ-200
- optical fibers
- silicon counting photodetectors (MPPC)
- DC-DC converter: iseg APN 02 255 5
- data acquisition card acq card
- COSMO project