Speaker
Description
Muon Spin Relaxation measurements at continuous sources have stagnated at a stopped muons rate of 40 kHz and generally require sample sizes of at least 5 mm by 5 mm. Taking advantage of recent developments in pixel detector technology, we successfully implemented a prototype Si-pixel-based muon spin spectrometer at PSI. Unlike scintillator-based systems, this spectrometer utilizes the MuPix11 chip (≤100 μm thick), enabling tracking with high spatial resolution of 23 μm. The spectrometer is configured as a four-layered telescope, each with an active area of 4 cm by 4 cm, forming two layers upstream of the sample and two downstream. Both muons and positrons are tracked and extrapolated to the sample region. Each muon is matched to an emitted positron if their tracks intersect at the sample position. This spectrometer allows us to go beyond the 40 kHz stopped muons rate generating spatially resolved μSR spectra with low uncorrelated background.
We demonstrate the capabilities of this spectrometer by mapping the magnetic field produced by two NdFeB magnets mounted on a silver plate; see Figure. We are able to extract individual μSR spectra from areas of 1.5 mm by 1.5 mm, thus producing a 2D field map. Additional performance advantages include measurements on multiple samples simultaneously, three-dimensional surface tomography, and unprecedented resolution of submillimeter features in the measured samples.
| pascal.isenring@psi.ch | |
| Funding Agency | Swiss National Science Foundation, SNSF 215167 |
| Supervisors Name | Zaher Salman |
| Supervisors Email | zaher.salman@psi.ch |
| Did you request an Invitation Letter for a Visitors Visa Application | No |
