The ESRF will most probably not be the last light source that will be confronted with a (complete) upgrade of its storage ring, while leaving the existing beamlines in place.
The particular difficulties and challenges with the complete dismantling and disposal of the old storage ring, and subsequent installation of the new ring will be reviewed.
This will also be an introduction talk to the...
In 2023-2024, the SLS storage ring will be upgraded for significantly higher brightness and coherence. The upgrade will require similar diagnostics systems to those already implemented for the current SLS operation. However, the number of devices, their specifications and their technical realizations have to be adapted to the specific requirements of SLS2.0, and the newly available...
The High Energy Photon Source (HEPS) is a 6-GeV, 1.3-km, ultralow-emittance storage ring light source to be built in the Huairou District, northeast suburb of Beijing, China. The beam diagnostics as the critical part of the diffraction-limited storage ring light source have many challenges in design and fabrication. This report will present the preliminary design of HEPS beam diagnostics,...
The fourth generation light sources demand a new level for the performance of the beam diagnostic systems as well as use of stable and proven but renovated devices whenever it is possible. From the other side the nowadays industry gives an opportunity for both ways for the evolution of the diagnostic systems. Here we are considering some concepts (mainly for BPM) proposed for use in ISSI-4...
Beam position measurement diagnostics required for the APS upgrade (APS-U) are driven by challenging beam stability requirements resulting from the small beam size due to the machine design emittance of 42 pm. Similarly beam size measurements to derive emittance and energy spread are also made difficult by the small beam size. The AC stability specification states that rms beam motion must...
The scheme of the digital signal processing applied on the beam signal to obtain the position data used by the fast orbit correction in the Libera Brillance is based on the requirement of a standard RF receivers for telecomunication application.
The constraints of the fast orbit correction are different and the optimisation of the filtering based on these specific constraints can lead to a...
Elettra is developing a modular eBPM system, based on pilot-tone technique for long-term stability compensation and self-calibration, and it is composed by the analog front end, the 4-channels 16-bit A/D FMC module and the digital carrier board. While the former two have been completely developed and verified, the latter is in testing phase.
In a first prototype the Verilog code for the eBPM...
Some Libera users observed unexpected jumps on amplitudes of BPM. Occurrence of these jumps was totally random and not linked to production batches, operation frequencies and applications. Instrumentation Technologies took these instruments under investigation. The problem was narrowed down to a single component which is common to all analog front-ends and most probably causes the jumps. There...
A bunch-by-bunch beam position monitor is being designed for HEPS. The BPM consists of two parts: Analog Front End (AFE) and Digital Front End (DFE). There are four input ADC channels at 500MS/s,12bit and an adjustable phase clock fanout circuit at AFE. The sampling clock could be free running clock or externally clock locked with beam signal. DFE is designed with the high-performance FPGA/CPU...
At SSRF, we have been developing digital BPM signal processors (DBPM) for more than 10 years. The DBPM sampling at about 120MHz already applied on Dalian Coherent Light Source, Shanghai Soft X-ray FEL, and SSRF for beam position measurement. Now, we are developing higher performance DBPM running at about 500MHz, which can be used for bunch-by-bunch BPM measurement for SSRF storage ring. The...
The ESRF has adopted the so-called Spark electronics for its 128 additional BPMs in the new ring.
All these units had been installed on real RF-BPM signals for many months in 2018, to verify their reliability & performance (i.e. stability).
These Spark electronics do not use any active compensation scheme (at all) to correct any (relative) drift (between the 4 RF-channels) and yet fulfil our...
The upgraded ESRF's storage ring comes with brand new BPM. Unfortunately BPM blocks are not ideal and gives the beam position with a random offset coming from mechanical imperfection of the buttons and the vacuum chamber. In order to estimate and compensate for these offsets we measured the button-to-button RF transmission on every BPM block, which can yield to an estimate of BPM blocks...
The S-parameters of a four button block with 6mm buttons have been measured using a commercial Vector Network Analyser. The quality of the measurement is evaluated with the Lambertson method in mind to determine the gain of the individual buttons.
BPM electronics are compensated to cancel local drifts of its electronics components to temperature or humidity variations. However the dependences of the BPM cables to those external parameters are not yet considered or quantified. If the temperature is generally well controlled in the synchrotron buildings (+-1°C), the relative humidity is not and may vary between 20 to 70 % over a year. In...
We present a calibration method for the single pass (SP) BPM using pulsed RF signals. It enables the offset calibration of BPMs necessary to accomplish the beam first turn prior to the start of accelerator commissioning. One of the major factors of the offset is the gain imbalance between BPM channels by uneven characteristics of signal cables and readout electronics. Signal reflections in the...
BpmLab is a 2D finite element-based tool for Matlab developed at ALBA and aimed at simulating the electrode response of BPMs of arbitrary geometry to emulated beam excitation. Lately, BpmLab has been thoroughly adapted to EBS BPM geometries to analyze the nonlinear effects and the remedies around them. More complicated situations have as well been studied, e.g. imperfect positioned...
In order to measure the noise level of a BPM system from beam generated orbit data, the correlated beam jitter has to be removed from the position signals. There exist different ways to extract the BPM noise as the "three-BPM" correlation method or the model-independent principal components analysis (PCA). Both methods will shortly be discussed. Based on a PCA the resolution of the PETRA III...
A newly re-implemented feature of the Diamond Multi-Bunch Feedback processor
(DLS MBF) uses the ability to measure the betatron/synchrotron tunes using a
phase locked loop approach, which produces tune readings at many kHz rate.
This function (which we call Tune PLL) provides insight into the dynamic
behaviour of systems affecting the machine tunes.
A new application of the Tune PLL...
A new 14-bit 500 MS/s digitizer was evaluated in ELETTRA storage ring and FERMI linear accelerator. The sampling clock is hard-locked to the Master Oscillator and has a jitter of a maximum 10 ps. The AC coupled version has an analog bandwidth up to 2 GHz and was used to measure the fill pattern. The bunch flat-top is very narrow (10-15 ps). To reach better stability, various external filtering...
A new digital FMC carrier board with Altera/Intel Arria 10 FPGA and 10 GbE capability has been developed to support various applications of Elettra-Sincrotrone Trieste laboratories, such as eBPM, PhBPM, Diamond detectors, TDC, etc...
One of these applications is to replace our old uTCA digitizer cards called ADA and ADO that are used in the Cavity BPM system for Fermi@Elettra Free Electron...
SOLEIL is currently upgrading its Beam Loss Monitor system from pin-diode detectors to plastic scintillators associated with photosensor modules. After preliminary tests, a first set of 20 new BLMs have been installed on 2 cells of the storage ring. Installation setup, calibration procedure and first measurements will be presented.
In the X-ray FEL facility SACLA, an electron beam with low slice emittance (γε < 1 µm rad), high peak-current (~10 kA) and short bunch length (~10 fs) is required for high quality FEL operations. We initially installed optical transition radiation (OTR) screen monitors for a beam profile measurement. Since the beam profile could not be observed due to intense coherent OTR, we replaced the OTR...
The European XFEL uses scintillating screens and wire scanners for the transverse beam profile measurements. Mostly there are the scintillating screens (more than 70 along the machine). Nevertheless there are two issues observed during the machine operation.
The first one is an observation of beam shapes with an intensity drop in the center, which reminds OTR but it’s not it according to the...
OASYS (OrAnge SYnchrotron Suite) is an open source, user friendly platform which collects all the most relevant software for the simulation of synchrotron radiation, such as XOP, SHADOW, SRW and others. This presentation will provide a quick overview on the software from the point of view of a user.
