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Frequently asked questiones


What is Libera Hadron?


Libera Hadron is a BPM signal processing system specially developed for heavy particles circular machine applications. The system provides high resolution single bunch position measurements.


How Libera Hadron works?


Libera Hadron takes the BPM electrode signals, applies analog and digital signal processing in order to optimally measure the response to individual bunches. The individual bunch positions are collected and presented through the available data paths.


What kind of data paths are supported by Libera Hadron?


Libera Hadron supports continuous data streams and on demand acquisitions. The provided on demand acquisition include raw data, Single Pass - Single Bunch position and charge measurements and Turn by Turn rate measurements. The system provides Fast Acquisition - Fast Feedback streams (typically 10 kHz data rate streams with the possibility of increasing the rate) and Slow Acquisition (typically 10 Hz) stream use mainly for monitoring purposes. The system can be customized in order to deliver other data streams required by the user, like individual bunch beam arrival time measurements and bunch map representations of individual bunches. The system can be also upgraded in order to apply low latency feedback on individual bunches.


How does Libera Hadron looks like?


Libera Hadron in developed on uTCA based 19“ 2U platform chassis. The system integrates distributed FPGA and Computing Module processing power. The chassis can populate up to 4 BPM modules in order to acquire simultaneously the position from 8 BPM planes. The instrument consists of a high performance stabilized RF front-end and state-of-the-art analog to digital converters. The digital signal processing is implemented on Virtex_5 FPGA and a computing module that can access to large data buffers (up to 8 Gbits per BPM) through a PCIe bus. The data acquired by the BPM modules can be transferred through dedicated low latency LVDS links to FPGA based real time DSP modules for further processing and SFP streaming for feedback purposes.


How can I use Libera Hadron?


The system can be used in a very intuitive way. All you need to do is to connect to the unit to your BPM pickup signals or to a laboratory simulated beam signals, plug the network cable and access the system through any machine in network. The Libera Basic Application Support Environment provides several tools in order to enable immediate and unified access to the instrument functionality. Libera Hadron can be in few minutes integrated with several working environment like Matlab, Octave, web services, Microsoft Office... etc...Libera BASE provides a immediate access to many signal processing parameters, provides the access to the acquired data from more or less any development environment.


How can I program Libera Hadron?


Libera Basic Application Support Environment enables the development of remote signal processing algorithms tightly integrated with the instrument. The algorithms have access to the acquisitions and the processing parameters from multiple instruments. The signal processing parameters can be controlled as a function of the global machine behavior in order to optimize the instrument performance for specific machine operation. The experience from different machined operation can be shared through the algorithms. Furthermore the system also enables the integration of such algorithms in the local computing power and FPGA resources for applications that require real time signal processing. The described algorithm development tools shorten the instrument usage learning curve, give an immediate indication of the instrument operation capabilities in the accelerator context in order to simplify the integration procedures and enables the confirmation of new data processing concepts and extensions of the instrumentation functionality.
An example of the heterogeneous instrument usage is the integration of Libera Hadron with Libera LLRF system for storage ring injection applications. The Libera Hadron installed in the storage ring provides the information about injected charge in the machine and the beam arrival time. An algorithm that can be remotely or locally implemented in the Libera LLRF system, processes this information and optimally controls the acceleration and other machine parameters in order to optimize the injection efficiency. Furthermore the Libera Hadron measurements can be actively used to apply a suitable LLRF beam loading compensation and to apply longitudinal and transverse control of the beam position.

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