2 sujets IRFU/DACM

Dernière mise à jour :


• Accelerators physics

 

Design and manufacturing of a 4D-emittancemeter for characterization of very high current ion sources

SL-DRF-24-0034

Research field : Accelerators physics
Location :

Département des Accélérateurs, de Cryogénie et de Magnétisme (DACM)

Laboratoire d’Ingénierie de Systèmes Accélérateurs et Hyperfréquences (LISAH)

Saclay

Contact :

Olivier TUSKE

Maxence Vandenbroucke

Starting date : 01-10-2024

Contact :

Olivier TUSKE
CEA - DRF/IRFU/SACM/LEDA

+33 1 69 08 68 20

Thesis supervisor :

Maxence Vandenbroucke
CEA - DRF/IRFU/DEDIP

01 69 08 22 83

Laboratory link : https://irfu.cea.fr/dacm/

More : https://irfu.cea.fr/dedip/index.php

Ion accelerators, including protons, at very high intensity (> 50 mA), find numerous applications in various fields of nuclear physics or material characterization for medical, nuclear, and other applications. The Department of Accelerators, Cryogenics, and Magnetism (DACM) at CEA-Saclay specializes in the design and realization of very high-intensity ion sources.
With the increase in beam current, these sources become increasingly complex. Therefore, mastering the quality of the beam becomes critical to limit power deposition and the activation of accelerator elements. To better understand and describe this beam, it is necessary to determine its 4D emittance, which includes both the geometric shape of the beam and its trajectory. The device used for this measurement is called a 4D emittance meter.
Such a device based on a scintillator has already been designed and tested. This scintillator converts a portion of the beam into an image, which is then captured by a camera. Unfortunately, while this technology is functional at high energy, it is not suitable at the source outlet, at low energy, as the scintillation layers are quickly damaged by the ion flux.
The charge reading method proposed in this thesis is novel and benefits from the synergy between particle detector research for high-energy physics and proton source research. Instead of using a camera for reading, the idea is to measure, from a PCB placed directly in the beam, the current carried by the ions. This method allows reading this current at several thousand positions to obtain the 4D emittance. The fast acquisition system will also allow observing the temporal variation of the emittance during the start-up and shut-down phases of the source.
This device will be used for analyzing the beam generated by the ALISES sources developped by the laboratory.
Simulation and characterization of very high intensity ion sources

SL-DRF-24-0459

Research field : Accelerators physics
Location :

Département des Accélérateurs, de Cryogénie et de Magnétisme (DACM)

Laboratoire d’Etudes et de Développements pour les Accélérateurs (LEDA)

Saclay

Contact :

Guillaume Ferrand

Juliette PLOUIN

Starting date : 01-03-2024

Contact :

Guillaume Ferrand
CEA - DRF/IRFU/DACM

01 69 08 59 64

Thesis supervisor :

Juliette PLOUIN
CEA - DSM/IRFU/SACM/LISAH

+33 169 08 12 65

Light ion accelerators (such as protons and deuterons) at very high intensity (typically exceeding 50 mA) have numerous applications in various fields of physics. From the IFMIF accelerator project, to characterize future materials for fusion reactors, to IPHI-Neutrons, to produce images through neutron radiography, CEA is involved in many projects that require the design and construction of very high-intensity ion sources. The increasing demand for intensity and beam quality from these ion sources requires a better understanding and prediction of their operation.
Ion sources are composed of a plasma chamber inserted into a magnetic coil, in which a gas heated by an RF wave is injected. The produced ions are extracted from the chamber using an electric field applied to extraction electrodes. Their operation depends on a large number of parameters. Determining an ideal set of parameters is very complex to achieve, and no software currently exists to reliably predict its proper functioning.
CEA has been working for several years on the design of a test bench, BETSI, to test and optimize various ion sources for future accelerator projects. Experimental campaigns have been conducted in the past on this test bench to systematically test sets of parameters.
In the context of this thesis, we propose to develop a simulation code that takes into account all the parameters that we can qualify on BETSI (from past experiments or new ones). We will be able then to use the code to propose new sources for upcoming accelerator projects.

 

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