Objective
For the design of an experiment searching for a neutron electric dipole moment (EDM) at the projected new ultracold neutron facility at PSI, a test experiment aimed at investigating various aspects of the generation of a large-volume (100 litres in the test experiment, 0.5 m3) in the final experiment) constant magnetic field with an unprecedented stability and homogeneity will be performed.
The project will be carried out by a collaboration of research teams from Switzerland, France and Russia and has 2 main objectives:
A) Construction of a large volume 4 layer magnetic shield (1:2 scaled down version of final layout) with active stabilization of the external magnetic field. The inner volume will be equipped with 5 quantum-optical Cs magnetometers that serve to measure the field stability and homogeneity and to stabilize the neutron resonance frequency in the final experiment;
B) Further development of the magnetometric technique by using Rb rather than Cs and by using resonant diode lasers rather than discharge lamps for the operation of magnetometers. Characterization and optimisation of these magnetoemeters.
The required temporal stability for the field in the EDM experiment is on the order of 10fT averaged over a 1000 s time interval. The required spatial homogeneity of the field is about 10pT / 20cm.
A low-temperature SQUID magnetometer will provide independent, complementary information on the field homogeneity and stability. We also intend to compare the results with those of a 3He magnetometer and/or a 199Hg magnetometer. The successful completion of this experiment is a necessary prerequisite for the future neutron EDM experiment at PSI.
Fields of science (EuroSciVoc)
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Programme(s)
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Topic(s)
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Call for proposal
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Funding Scheme
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Coordinator
1700 Fribourg
Switzerland
The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.