Hello,
At ESRF we have been exploring the possibility to do single-electron control and measurement with the use of 4 screens in TL2 and a simple and low-cost Photon Multiplier Tube (PMT) installed in the visible-light laboratory (ID04). We could inject 1-2-3-4-5 electrons the EBS ring. The first direct application was the measure of the beam purity during MDTs. We are going to install a Pico-Harp and a Time-Correlated-Photon-Counter (TCPC), for a bunch-purity measurement that may allow to cover up to 10e-11 dynamic range during User-mode operation (USM).
Find attached the first measurements.
If you have any question or suggestion, please comment.
Elena
Similar work has been done in Metrology Light Source for a primary radiation source standard but with a different approach (scraping from high-current to a single electron and cooled photodiode).
See Figure 12 c of Publication in PRST-AB: https://inspirehep.net/files/6acaafbc9ad41418b82ca9f70109f976
It looks like the previous measurement from MLS has a better signal-to-noise ratio.
What would be the advantage to use the high-efficiency PMT?