The Libera is a data acquisition and beam position processor system used for the BPM systems in different accelerators and transfer lines. It was developed by the slovenian company Instrumentation Technologies and was adapted and enhanced for FAIR applications as an in-kind contribution. It is a modular MicroTCA based system used in different configurations for the particular requirements of the BPM systems.

Each of our Liberas has some features which are common for each application:

• 19“, 2U, 310mm depth
• MTCA based (non standard)
• COMe Controller Board
• FTRN slot
• Acts as FEC
• Up to 4 BPM modules

For GSI/FAIR beam diagnostics there are four types of applications:

• Libera Hadron for Circular Machines
• Libera Hadron for Circular Machines + Closed Orbit Feedback (COFB)
• Libera Hadron for HEBT
• Libera Single Pass H

Another application for the Libera at GSI/FAIR is the Low Level RF (LLRF) controlling. It is under responsibilty of GSI's LRF department and not further treated in this article.

From hardware point of view, the Liberas can be divided into three main configurations:

HEBT- / ESR- / HESR-Libera (Libera Hadron)

SIS18- /SIS100-Libera (Libera Hadron + COFB)

p-Linac-Libera (Libera SPH)

For the retrofit the Liberas are also now in use for GSI's SIS18 and ESR.