Mr. Sylvain Lassalle Profile

Sylvain Lassalle

at Thales LAS France SAS

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Publications (2)

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Proceedings Article | 7 June 2024 Presentation + Paper

HALT process for Thales rotary cooler reliability release

C. Vasse, S. Lassalle, S. Venzal, E. Durupt

Proceedings Volume 13046, 130461K (2024) https://doi.org/10.1117/12.3013617

KEYWORDS: Reliability, Prototyping, Cryocoolers, Accelerated life testing, Industrial applications, Design, Cryogenics, Power consumption, Failure analysis, Electronic components

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Rotary Stirling cooler reliability was considered as a limitation compared to linear Stirling coolers. Nevertheless, cooler reliability is a major performance requested by customers, especially for 24/7 applications, which are a growing market. Indeed, most of the time, coolers are one of the components dimensioning the lifetime of the system. This is due to the fact that the cooler remains a mechanical system with moving parts.

On the other hand, rotary Stirling coolers are a very good solution to reduce SWaP (Size, Weight and Power) at system level as they are more compact and efficient. Thus, several improvements have been made on rotary coolers in order to fill-in the reliability gap between linear and rotary coolers. Reliability improvement is an important part of Thales rotary coolers’ roadmap in order to propose on the market coolers able to answer to SWaP and reliable applications. For instance, Thales claims that the RM2 reliability is higher than 50,000h for a typical mission profile.

Increasing the cooler reliability becomes a challenge when the times come to validate evolutions. Indeed, lifetime tests are necessary before releasing an evolution but it is necessary to wait the end of the tests. For instance, with a reliability higher than 25,000h, several years are needed before the results. This is an important aspect that can explain the difficulty to increase the reliability.

The paper will focus on the latest works made at Thales on rotary coolers in the frame of that target. Works on Thales coolers will be used as an example. Firstly, we will illustrate the latest reliability improvements made on this cooler. In a second part, we will describe how to accelerate lifetime tests. Finally, the lifetime tests results will be presented.

Proceedings Article | 13 June 2023 Presentation + Paper

Improved reliability and flexibility of Thales RM2 rotary cooler

C. Vasse, S. Lassalle, S. Venzal

Proceedings Volume 12534, 125340B (2023) https://doi.org/10.1117/12.2663446

KEYWORDS: Reliability, Cryocoolers, Accelerated life testing, Power consumption, Cryogenics, Design and modelling

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Trends at detector and system levels are mainly linked to reduced SWaP (Size, Weight and Power), higher availability and higher flexibility of integration. As a first example, originally, the detectors used to be cooled around 77K. More recently, depending on the detector technology, the required bandwidth, and the performance, detectors operating temperature may vary in a broader range between 60K to 170K. In order to avoid having to develop a cooler for each specific detector, it is therefore necessary to have coolers that are capable to operate on a wide range of conditions. This flexibility shall also improve the SWaP at system level by reducing the electronic driver size and by making easier the cooler integration in the system. Moreover, the cooler reliability is a major performance requested by customers, especially for 24h/7 applications, which are a growing market. Indeed, most of the time, coolers are one of the components dimensioning the lifetime of the system. Several improvements were made on rotary coolers in order to fill the reliability gap between linear and rotary coolers. It is important to continuously improve this key parameter. All of these trends were taken into account in Thales rotary coolers’ road map in order to propose on the market coolers able to answer to these new users needs. The paper will focus on the last works made at Thales on rotary coolers in the frame of that target and more particularly on the RM2 cooler. Firstly, we will illustrate the latest reliability improvements made on this cooler with lifetime tests results. Then, we will describe a new option for this cooler allowing us to have better SWaP and flexibility.

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