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1. SRF programs towards High-Q/High-G cavities in IJCLab

Author

Miyazaki, Akira, Fouaidy, Mohammed, Gandolfo, Nicolas, Longuevergne, David, Olry, Guillaume, Vannson, Mael, Vogt, Lê My, Baudrier, Matthieu, Cenni, Enrico, Eozénou, Fabien, Jullien, Grégoire, and Maurice, Luc

Subjects
Physics - Accelerator Physics
Abstract

IJCLab has been leading the development and deployment of low-$\beta$ Superconducting Radio Frequency (SRF) cavities for proton and heavy ion accelerators. We are launching an electron accelerator project for sustainable Energy Recovery Linac (iSAS/PERLE) with state-of-the-art SRF cavities at 800~MHz. Our proposal includes advanced heat treatment of such cavities to reach an excellent quality factor of $3\times 10^{10}$ at $22$~MV/m. In this paper, we overview the status of this activity., Comment: Contribution to LCWS2024 proceedings

Published
2024

2. Improvement of Chemical Etching Capabilities (BCP) for SRF Spoke Resonators at IJCLab

Author

Demercastel-Soulier, Jules, Duchesne, Patricia, Longuevergne, David, Olry, Guillaume, Pépin-Donat, Thierry, Rabehasy, Fetra, Reynet, Denis, Roset, Samuel, and Vogt, Le My

Subjects
Cavities, Accelerator Physics
Abstract

Buffered chemical polishing (BPC) is the reference surface polishing adopted for ESS and MYRRHA SRF spoke resonators at IJCLab. This chemical treatment, in addition to improving the RF performance, fits into the frequency adjustment strategy of the jacketed cavity during its preparation phase. In the framework of the collaboration with Fermilab for PIP-II project, IJCLab has developed a new setup to perform rotational BCP. The implementation of a rotation during chemical etching improves significantly the homogeneity and quality of surface polishing. In this paper, we present the numerical analysis based on a fluid dynamics model. The goal is to estimate the acid flow characteristics inside the cavity, determine the influence of several parameters as mass flow rate and rotation speed and propose the best configuration for the new experimental setup, Proceedings of the 20th International Conference on RF Superconductivity, SRF2021, East Lansing, MI, USA

Published
2022
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3. Progress of PIP-II Activities at IJCLab

Author

Duchesne, Patricia, Berrutti, Paolo, Gandolfo, Nicolas, Le Dréan, David, Longuevergne, David, Martret, Richard, Parise, Mattia, Passarelli, Donato, Pépin-Donat, Thierry, Rabehasy, Fetra, Roset, Samuel, and Vogt, Le My

Subjects
Proton and Ion Accelerators and Applications, Accelerator Physics
Abstract

Since 2018, IJCLab is involved in PIP-II project on the design and development of accelerator components for the SSR2 (Single Spoke Resonator type 2) section of the superconducting linac. First pre-production components have been fabricated, surface processing and cavity qualification in vertical cryostat are on-going. IJCLab has upgraded its facilities by developing a new set-up to perform rotational BCP. The progress of all processing and testing activities for PIP-II project will be reported and, in particular, a dedicated study to qualify removal uniformity compared to static BCP will be presented., Proceedings of the 31st International Linear Accelerator Conference, LINAC2022, Liverpool, UK

Published
2022
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4. Human rights dimensions of food, health and care in children's homes in Kampala, Uganda - a qualitative study.

Author

Vogt LE, Rukooko B, Iversen PO, and Eide WB

Subjects
Adolescent, Child, Child Welfare legislation & jurisprudence, Diet standards, Feeding Behavior, Female, Humans, Malnutrition, Orphanages organization & administration, Orphanages standards, Pregnancy, Qualitative Research, Uganda, Vulnerable Populations, Child, Orphaned legislation & jurisprudence, Diet statistics & numerical data, Food Supply, Health Services Accessibility organization & administration, Human Rights
Abstract

Background: More than 14 % of Ugandan children are orphaned and many live in children's homes. Ugandan authorities have targeted adolescent girls as a priority group for nutrition interventions as safeguarding nutritional health before pregnancy can reduce the chance of passing on malnutrition to the offspring and thus future generations. Ugandan authorities have obligations under international human rights law to progressively realise the rights to adequate food, health and care for all Ugandan children. Two objectives guided this study in children's homes: (a) To examine female adolescent residents' experiences, attitudes and views regarding: (i) eating patterns and food, (ii) health conditions, and (iii) care practices; and (b) to consider if the conditions in the homes comply with human rights standards and principles for the promotion of the rights to adequate food, health and care., Methods: A human rights-based approach guided the planning and conduct of this study. Five children's homes in Kampala were included where focus group discussions were held with girls aged 12-14 and 15-17 years. These discussions were analysed through a phenomenological approach. The conditions of food, health and care as experienced by the girls, were compared with international standards for the realisation of the human rights to adequate food, health and care., Results: Food, health and care conditions varied greatly across the five homes. In some of these the girls consumed only one meal per day and had no access to clean drinking water, soap, toilet paper and sanitary napkins. The realisation of the right to adequate food for the girls was not met in three homes, the realisation of the right to health was not met in two homes, and the realisation of the right to care was not met in one home., Conclusions: In three of the selected children's homes human rights standards for food, health or care were not met. Care in the children's homes was an important contributing factor for whether standards for the rights to adequate food and health were met.

Published
2016
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