Beam Enhanced Stabilization Technology

Turnkey instrumentation and software suite specially designed to easily provide the capabilities for simultaneously controlling position (X, Y) and intensity (I0) of the photon beam in synchrotron radiation X-ray beamlines.


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  • Overview
  • Features
  • Technical specifications
  • Ordering options
  • Documentation
  • Software/Firmware



Control your beam position and intensity with a click!

The Beam Enhanced Stabilization Technology (BEST) by CAEN ELS is the only complete turnkey system for beam position intensity stabilization.

An extensive set of software applications, plugins and tools combined with powerful hardware allows users to perform and optimized their experiments and characterization on X-ray beamlines around the world.

Distributed architecture for maximum performance.

The BEST system is designed on a distributed architecture that allows installing all electronic building blocks as close as possible to the corresponding device – e.g. a piezo driver or a photon BPM. The system is composed by three main building blocks:

  • the READOUT block;
  • the ACTUATOR block.
Optimize and adapt your beamline experiments.

The FPGA-based hardware architecture allows performing the control algorithms at a maximized speed and with very low latency in order to guarantee full effectiveness of the BEST correction performance over a frequency spectrum up to several kHz. The slower and non-critical tasks (i.e. configuration commands) are separately performed at a higher level on the Linux OS Central Unit with dedicated software.

Interface to the Control System via EPICS IOC or Web Server.

The readout block is represented by the TetrAMM device: a 4-channel bipolar picoammeter with an integrated HV bias voltage source that can be connected directly to a four-quadrant phBPM detector – e.g. diamond detector, ion chamber or quadrature diodes.

This readout block has an independent 10/100/1000 Mbit Ethernet interface for standard communication and can be also used as a stand-alone readout unit. In addition to this, the TetrAMM has a high-throughput and low-latency SFP link that guarantees interface to the control unit.

The control and interface unit is the “brain” of the entire system and it is made by a 19″-1U rack that interconnects and interfaces to the other building blocks and gives access and control to the users directly via a Gigabit Ethernet interface. The control interface has a dedicated application that allows to set the parameters to configure the beamline system (detectors, piezo actuators, geometry) and control the photon beam behavior.

The EPICS IOC is also freely available to our users.


  • TURNKEY Instrumentation and Software Suite
  • Readout module - i.e. TetrAMM - for photon BPM
  • Actuation module - i.e. PreDAC multichannel high-precision DAC - for piezo driver
  • Control & Interface unit
  • X, Y and I0 correction and stabilization
  • Configurability to different detector geometries and configurations
  • Firmware remote update on all building blocks
  • Low-latency and high-speed links allow for higher frequency beam instability compensation - e.g. mechanical vibrations
  • 10/100/1000 Ethernet TCP-IP control

Technical specifications




Control Interface

10/100/1000 Mbit Ethernet TCP-IP

BEST Application

Local GUI

Standard Configuration

1 x TetrAMM picoammeter
1 x PreDAC actuator unit (2-channel)
1 x BEST control and interface central unit

Extended Configuration

2 x TetrAMM picoammeters
1 x PreDAC actuator unit (up to 4 channels)
1 x BEST control and interface central unit

Control and Interface Unit OS

Linux OS (Ubuntu 20.04)

Compensation Loops

Horizontal position (X)
Vertical position (Y)
Intensity (I0) - optional

Detector Configurations

Quadrature detectors (45° or 90°)

Loop Communication Interface

SFP - Small Form Factor Pluggable

Additional Features

- Firmware Remote Upgrade for each building block
- TetrAMM Oscilloscope "Pyscope" (with FFT and CSP)
- Frequency Analysis Tool (included in the Local GUI)
- Data Logger

Ordering options

Ordering code




BEST – 2-ch PreDAC, TetrAMM with +500V HV, Central Unit with embedded control system and EPICS IOC


Last reviewed: 2022-12-09 ⓘ More infoRevision: 1.7

Last reviewed: 2023-12-14 ⓘ More infoRevision: 3.2

Last reviewed: 2023-02-03 ⓘ More infoRevision: 1.1

Last reviewed: 2023-02-03 ⓘ More infoRevision: 1.8.17

Last reviewed: 2023-02-03 ⓘ More infoRevision: 1.0.32

Last reviewed: 2023-02-09 ⓘ More infoRevision: 1.5

Last reviewed: 2024-02-05 ⓘ More infoRevision: 1.2


Updated: 2023-01-23 - 3.88 MB ⓘ More info Version: 1.2.20

Updated: 2023-02-09 - 3.74 MB ⓘ More info Version: 1.0.04

Updated: 2024-02-28 - 44.16 MB ⓘ More info Version: 2.2.1
OS: Linux

Updated: 2024-02-28 - 42.43 MB ⓘ More info Version: 2.2.1
OS: Windows


WBEST3DACXAA - Additional DAC Channel

WBEST3DACXAA - Additional DAC Channel

High Precision Additional DAC channel for PreDAC

Copyright CAEN ELS s.r.l.