Fermi National Laboratory

Operation Terminology

T1005 - Muon g-2 Calorimeter Prototypes

The muon g-2 experiment at Brookhaven Nation Laboratory has measured the muon anomalous magnetic moment to 0.54 ppm. A proposed upgrade to the experiment would increase the precision of the measurement to 0.16 ppm. In order to achieve this, a factor of 5 increase in the rate of muon beam is necessary along with a reduction of systematic errors. In order to overcome this problem a new, segmented calorimeter design has been developed. The proposed design is a tungsten-scintillating fiber calorimeter with 35 segments, each read out by a separate PMT. Tungsten, produces compact showers. This is necessary, in order to improve shower separation in analysis and to fully contain the showers within a calorimeter that satisfies the strict space constraints of the experiment. A single calorimeter segment (4 x 6 x 15 cm3) has been constructed in order establish the feasibility of the new design and study its properties. Initial tests of the detector segment at the Paul Scherrer Institute were conducted with a low energy <400 MeV/c electron beam. A higher-energy test with electrons up to a few GeV/c was performed at the Test Beam Facility under the experimental number T-967. All data from that test have been analyzed and published and the tungsten-scintillating fiber calorimeter still appears to be a viable candidate. For this test beam run, a larger calorimeter (15 x 15 x 11 cm3) has been constructed and an emphasis will be placed on understanding shower leakage and the ability to separate pileup events with a more granular readout.



last modified 05/17/2010    email Fermilab
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