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Reference : UMR5821-CHRVEL-084
Workplace : GRENOBLE
Date of publication : Tuesday, February 23, 2021
Scientific Responsible name : Benjamin Cheymol
Type of Contract : PhD Student contract / Thesis offer
Contract Period : 36 months
Start date of the thesis : 1 October 2021
Proportion of work : Full time
Remuneration : 2 135,00 € gross monthly
Description of the thesis topic
Under the supervision of a research engineer, the PhD candidate will carry out research work to develop a transverse profile monitor for a high power linear accelerator (linac). These monitors are one of the key tools for the accelerator tuning, in order to limit beam losses and therefore the activation of components, and to characterize the particle beam for a better understanding of the accelerator.
The main objective of the thesis is to propose a reference design for the profile monitor, able to measure the transverse beam sizes at low duty cycle (i.e. a beam of a few tens of µs at a repetition rate of the order of Hertz) as well as in continuous wave mode (CW), with a dynamic range better than 4 orders of magnitude.
In order to meet the requirements, it will be necessary to combine several techniques, in particular a destructive method with a wire scanner (WS) and a non-invasive profiler for beam energies ranging from 17 to 600 MeV
In collaboration with the international team in charge of the design of the MYRRHA accelerator, the PhD candidate:
- will be in charge of the WS design, in particular by estimating the temperature increase of the wire due to the beam-material interaction and the expected signal levels.
-will perform studies to determine the best option for profile measurement with WS for beam energies greater than 200 MeV using Monte-Carlo code with of a scintillator-based detection system.
- will be in charge of the design of a non-invasive profiler for superconducting linacs, the candidate will:
• Define the best measurement method and key design parameters
• Study the effects leading to a measurement error, in particular the space charge effect, and adapt the design to reduce these errors.
• Define the detection system used for the reconstruction of the profile, with an attention on the possibility of using semiconductor detectors such as silicon, diamond or SiC detectors.
- actively participate in scientific communication (publications, conferences)
- may, depending on the opportunities and availability, contribute to other R&D programs in which the division is involved, such as the commissioning of the MYRRHA injector.
The laboratoire de Physique Subatomique et de Cosmologie de Grenoble (LPSC) (http://lpsc.in2p3.fr) is a public research laboratory under the supervision of CNRS/IN2P3, the University of Grenoble Alpes (UGA) and Grenoble-INP, with about 230 people working on the site.
The PhD student (M/W) will develop his mission in the Pole accélérateur et source d'ions within the LPSC and will be under the responsibility of Benjamin Cheymol, CNRS research engineer.
Constraints and risks
During the commissioning phases of the instrument and / or the accelerator, the PhD student ( M/W) may be required to work in area with ionizing radiation (accelerator tunnel for example), in this case the candidate will receive radioprotection training.
Trips are planned in the framework of the thesis and in particular to Mol and Louvain la Neuve (Belgium) for meeting, conferences and potentially beam tests and accelerator commissioning.
The research will be done in either French or English, however it is expected that the non-French speaking candidate will strive to learn the basics of French in order to facilitate communication and integration in the laboratory. It will be beneficial, bur not mandatory for the candidate to have some knowledge about particle accelerator.
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