Gamma ray spectroscopy at high energy and high time resolution at JET

Tardocchi, M.; Proverbio, L. I.; Gorini, G.; Grosso, G.; Locatelli, M.; Chugonov, I. N.; Gin, D.; Shevelev, A.; Murari, A.; Kiptily, V.; Syme, B.; Fernandes, A.; Pereira, Rita; Sousa, J.; Contributors, Jet‐Efda

doi:10.1063/1.2964205

Cited by 35 publications

(58 citation statements)

References 8 publications

(14 reference statements)

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“…In order to simulate the high rate environment expected at JET, a mock up of high counting rate measurements 15 has been performed in the laboratory by using a blue LED powered by Keysight (model 81150A) pulse generator. With this setup, we were able to illuminate the MPPC with blue light at a chosen intensity and at increasing counting rates up to about 1 MHz.…”

Section: A Measurements With Led Pulsementioning

confidence: 99%

Performance of the prototype LaBr3 spectrometer developed for the JET gamma-ray camera upgrade

Rigamonti

Muraro

Nocente

et al. 2016

Review of Scientific Instruments

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In this work, we describe the solution developed by the gamma ray camera upgrade enhancement project to improve the spectroscopic properties of the existing JET γ-ray camera. Aim of the project is to enable gamma-ray spectroscopy in JET deuterium-tritium plasmas. A dedicated pilot spectrometer based on a LaBr crystal coupled to a silicon photo-multiplier has been developed. A proper pole zero cancellation network able to shorten the output signal to a length of 120 ns has been implemented allowing for spectroscopy at MHz count rates. The system has been characterized in the laboratory and shows an energy resolution of 5.5% at E = 0.662 MeV, which extrapolates favorably in the energy range of interest for gamma-ray emission from fast ions in fusion plasmas.

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Section: A Measurements With Led Pulsementioning

confidence: 99%

Performance of the prototype LaBr3 spectrometer developed for the JET gamma-ray camera upgrade

Rigamonti

Muraro

Nocente

et al. 2016

Review of Scientific Instruments

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“…The main purpose of the TRP module is to perform highresolution gamma spectroscopy at very high count rate (few MHz) [9], with the possibility to perform real time algorithms for data reduction and digital pulse processing [10], to comply with the plasma flux increase provided by future fusion experiments.…”

Section: Trp Modulementioning

confidence: 99%

HDL based FPGA interface library for data acquisition and multipurpose real time algorithm processing

Fernandes¹,

Pereira²,

Sousa³

et al. 2010

2010 17th IEEE-NPSS Real Time Conference

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The inherent parallelism of the logic resources, the flexibility in its configuration and the performance at high processing frequencies makes the field programmable gate array (FPGA) the most suitable device to be used both for real time algorithm processing and data transfer in instrumentation modules. Moreover, the reconfigurability of these FPGA based modules enables exploiting different applications on the same module. When using a reconfigurable module for various applications, the availability of a common interface library for easier implementation of the algorithms on the FPGA leads to more efficient development. The FPGA configuration is usually specified in a hardware description language (HDL) or other higher level descriptive language. The critical paths, as the management of internal hardware clocks, that require deep knowledge of the module behavior shall be implemented in HDL to optimize the timing constraints. The common interface library should include these critical paths, freeing the application designer from hardware complexity and able to choose any of the available high-level abstraction languages for the algorithm implementation. With this purpose a modular Verilog code was developed for the Virtex 4 FPGA of the in-house Transient Recorder and Processor (TRP) hardware module, based on the Advanced Telecommunications Computing Architecture (ATCA), with eight channels sampling at up to 400 MSamples/s. The TRP was designed to perform real time Pulse Height Analysis (PHA), Pulse Shape Discrimination (PSD) and Pile-Up Rejection (PUR) algorithms at a high count rate (few MHz). A brief description of this modular code is presented and examples of its use as interface with end user algorithms, including a PHA with PUR, are described.

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“…The LaBr 3 (Ce) detector coupled to the ATCA digitizer system was used for the measurements. The PMT was equipped with an active voltage divider to minimize gain drifts induced by high signal currents [8]. Gamma rays from the nuclear reactions 27 Al(p,nγ) 27 Si and 27 Al(p,αγ) 24 Mg were detected in experiments at different counting rates.…”

Section: High Rate Gamma Ray Spectroscopymentioning

confidence: 99%