Papers

Libera references

Libera instruments

Web GUI Development and Integration in Libera Instrumentation – ICALEPCS 2021

During the past 5 years, Instrumentation Technologies expanded and added to the embedded OS running on Libera instruments (beam position instrumentation, LLRF) a lot of data access interfaces to allow faster access to the signals retrieved by the instrument. Some of the access interfaces are strictly related to the user environment Machine control system (Epics/Tango), and others are related to the user software preferences (Matlab/Python). In the last years, the requirement for easier data streaming was raised to allow easier data access using PC and mobile phones through a web browser. This paper aims to present the development of the web backend server and the realization of a web frontend capable to process the data retrieved by the instrument. A use-case will be presented, the realization of the Libera Current Meter Web GUI as a first development example of a Web GUI interface for a Libera instrument and the starting point for the Web GUI pipeline integration on other instruments. The HTTP access interface will become in the next years a standard in data access for Libera instrumentation for quick testing/diagnostics and will allow the final user to customize it autonomously.

New RF BPM Electronics for the 560 Beam Position Monitors of the APS-U Storage Ring – IPAC 2021

With the upgrade of the APS storage ring to a multi-bend achromat lattice, 560 RF Beam Position Monitors (BPMs) will be required. The projected beam sizes are below 10 microns in both horizontal and vertical planes, putting stringent requirements on the BPM electronics resolution, long-term stability, beam current dependency and instrument reproducibility. For the APS-U project, the Libera Brilliance+ instrument has been upgraded in technology and capabilities, including the addition of independent multi-bunch turn-by turn processing and an improved algorithm to further reduce artifacts of the crossbar switch. More than 140 instruments, equipped with 4 BPM electronics modules each, are being delivered to Argonne National Laboratory, consisting of the largest scale production for Instrumentation Technologies. In this contribution, the extensive test conditions to which the instruments were exposed and their results will be presented, as well as the beambased long-term drift measurements with different fill patterns.

Development of the FAIR pLINAC RF Systems and LLRF (Part II), B. Baričević

Development of the FAIR pLINAC RF Systems and LLRF (Part I), G. Schreiber

Feasibility of Reactor Pulse Operation at the IJS TRIGA Reactor for Nuclear Instrumentation Detector Testing at Very High Neutron Flux Levels

Abstract: A vital phase in the development of nuclear instrumentation detectors and associated electronic data acquisition systems is experimental testing and qualification in a well-characterized and representative radiation field in a reference irradiation facility. The neutron flux levels in modern material testing reactors (MTRs) are in the range of 1014 – 1015 n cm-1 s-1. However, the number of dedicated test facilities in Europe is currently decreasing, with numerous research reactors recently and soon to be shut down. The 250 kW JSI TRIGA reactor is a very well characterized reactor in terms of the knowledge of the neutron and gamma fields, a product of the work performed at the JSI over the last decade, mostly in collaboration with the Instrumentation, Sensors and Dosimetry Laboratory at CEA, Cadarache. Therefore it fulfills very well the first criterion for a reference facility. However, in steady state operation, it is able to generate a maximum neutron flux level of around 2×1013 n cm-1 s-1, i.e. several orders of magnitude lower than the MTR-relevant range. In steady-state mode, the requirement of representativeness is therefore not fulfilled well. On the other hand, the JSI TRIGA reactor can operate in pulse mode, due to its prompt negative temperature coefficient of reactivity. Depending on the inserted reactivity, the peak power can reach up to 1 GW, and the pulse duration is of the order of a few seconds (low and long pulses), to 5-10 milliseconds (high and short pulses). The neutron flux level is proportional to the reactor power level, therefore the highest attainable flux is nearly 1017 n cm-1 s-1, albeit for a short amount of time. In 2019, a bilateral collaboration project between the CEA and JSI was initiated, to investigate the possibility of neutron flux measurements performed at very high neutron flux levels in reactor pulse operation, made possible by a modern, validated, wide dynamic range neutron acquisition system. The project aims at demonstrating the feasibility of nuclear instrumentation and associated electronic data acquisition system tests at the JSI TRIGA reactor at neutron flux levels relevant to MTRs. This paper presents the first measurements in reactor pulse operation, performed during an experimental testing campaign in collaboration with researchers from the CEA, as well as with colleagues from Instrumentation Technologies using a Keithley electrometer-based acquisition system and an I-Tech-developed current meter. A more exhaustive experimental campaign is scheduled to be carried out at the JSI TRIGA reactor jointly by CEA and JSI researchers in the autumn of 2020.

Filling pattern measurement using a 500 MHz digitizer at Soleil and APS storage rings