Topics

1

General Discussion / SINGLE ELECTRON MEASUREMENTS

« on: March 31, 2022, 09:52:18 AM »

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

2

General Discussion / BEAM PHASE MONITOR at ESRF

« on: November 24, 2021, 11:39:14 AM »

Hello,

At ESRF we now re-installed a high quality numeric BEAM PHASE monitor that is achieving very good & useful results.
It is based on a simple Spark-BPM electronics, using the available I and Q buffers in that device.
The resolution is about 1millidegree and it can measure at sampling speeds upto Turn-by-Turn rate (2.8us ESRF)
If you want more information please contact Elena or Kees, or download the available pdf.

3

General Discussion / X-BPM system in EBS

« on: November 04, 2021, 11:49:27 AM »

Hello,

At ESRF we finally put in operation the first two X-BPMs with very good results! Find below some information.

Two units of "optical X-BPM" were installed in October Shutdown in the Front-End modules of 2 different ending-Magnet-Source Beamlines.
These provide us with precious information on the vertical position of the X-ray beam at 23m downstream the source-point.
The concept of this type of X-BPM is 100% invasive, so not compatible with the users taking their X-ray beam when this X-BPM is inserted.
This obviously limits measurement periods of this device to 1 day per week and to moments when the users are not taking their beam.
Nevertheless, it allows us to check (regularly) with high precision if the (vertical) position of the X-ray beam is stable or not.
Both units show excellent results, and further developments on now non-invasive X-BPMs, also in BM-lines,
at the same location in the Front-End, and also only for vertical position, are on-going.

If you want more information please contact Elena or Kees, or download the available pdf here.