High accuracy position response calibration method for a micro-channel plate ion detector

Abstract

We have developed a position response calibration method for a micro-channel plate (MCP) detector with a delay-line anode position readout scheme. Using an in situ calibration mask, an accuracy of 8 µm and a resolution of 85 µm (FWHM) have been achieved for MeV-scale α particles and ions with energies of ∼10 keV.At this level of accuracy, the difference between the MCP position responses to high-energy α particles and low-energy ions is significant. The improved performance of the MCP detector can find applications in many fields of AMO and nuclear physics. In our case, it helps reducing systematic uncertainties in a high-precision nuclear β-decay experiment.

Momentum-Space Atom Correlations in a Mott Insulator

“…This value is slightly larger than l c (measured at δ k = 0), by a few times k a /1000. This tiny discrepancy may be explained by small imperfections of the He * detector in measuring particle distances comparable to its radius (see for instance [52,53] and Annex C). While the measured correlation lengths and amplitudes may be affected by the response function of the detector, the 3D integral of the bunching peak, which quantifies the probability for two atoms to bunch, should be a physical quantity conserved through the detection.…”

A large area high resolution imaging detector for fast atom diffraction

“…However, these detectors are comparatively more complex than simple imaging detectors in particular significant local distortions are often present [1,6]. These local aberrations can be empirically corrected to an impressive absolute positioning accuracy of 10 µm rms [7] but with additional efforts including a permanent specific grid. When neither timing accuracy nor coincidence measurements are needed, a simpler technique almost aberration free, is to project the electron shower onto a phosphor screen and to image it by a camera.…”

Electron shakeoff following theβ+decay ofNe+19andAr+Fabian1, Fléchard2, Pons3 et al. 2018Phys. Rev. ASelf Cite14160View full textAdd to dashboardCite

“…During the last two decades, the search for such exotic interactions has motivated new experiments based on modern ion-trapping or atom-trapping techniques coupled to intense radioactive beams [6][7][8][9][10][11]. The most recent or ongoing experiments detect the β particles and the recoil-ions in coincidence, providing a precise recoilion energy measurement using time of flight (TOF) techniques.…”