LIDC2

LIDC2

The Cavity and Cryomodule Development and Integration Laboratory (LIDC2) is a center of expertise within DACM, specialized in research on superconducting accelerator cavities and cryomodule integration. LIDC2 provides expertise to support IRFU projects. The laboratory carries out R&D work required to develop cavities from the perspective of both materials (multilayer and polishing) and surfaces (electropolishing and high-pressure rinsing). It participates in the design and development of cryomodules for both French and international accelerators such as SPIRAL2, XFEL and ESS. It is in charge of integrating these systems from the prototype stage. LIDC2 also manages certain shared DACM resources, such as cleanrooms, the chemical treatment facility, materials characterization laboratories and assembly halls.

A staff of 18 engineers and 11 technicians carries out laboratory operations and projects.

#3356 - Last update : 07/05 2023

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352 MHz RF Platform : Context High power tests of RF accelerator components (power couplers, RFQ, warm cavities) can be performed for structures resonating at 352 MHz. The platform is equipped with two CW klystrons and one pulsed klystron. RF signal can be sent to three radiation shielded bunkers.

352 MHz RF platform : 352 MHz RF platform is equipped with: ? Two Thales TH2089B klystrons that can each deliver 1.3 MW of continuous RF power. ? One Thales TH2179A pulsed klystron with an in-built DTI Sigmaphi modulator with a peak power of 3 MW, which can deliver 240 kW of average RF power, with a pulse length of between 10 and 3600 μs and a frequency repetition of between 1 and 50 Hz. In particular these characteristics cover the useful cycle of the ESS (European Spallation Source).

Chemistry laboratory : The chemistry laboratory has: ? 6 ventilated fume chambers for the treatment of samples and cavities, including a vertical electropolishing system for the chemical or electrochemical treatment of the internal surface of niobium cavities using concentrated acids. ? Adjacent storage area for acids and solvents. ? Pure and ultra-pure water production plant. ? Liquid effluent treatment plant for treating diluted acids. ? Storage tank for concentrated acid waste (capacity 5 m³).

Cryholab – laboratory horizontal cryostat (property of IRFU-IN2P3 ) : Tests of superconducting cavities in the same conditions as in an accelerator. Radio frequency power supply: now 700 W; foreseen: 80 kW for continuous input; up to 1 MW for pulsed input. Pumping unit coupled with Helial 4012 refrigerator: 80 W at 1.8 K and 13 mbar. Useful internal size: 1.5 m length and 70 cm diameter.

Cryo/HF Supratech platform : The Cryo/HF Supratech station has cryogenic and hyper-frequency equipments[PO1] that can be used to develop the key subassemblies of superconducting accelerators such as superconducting cavities, power couplers and complete accelerator modules (e.g. cryomodules).

Diagnostics, vacuum and assembly laboratory (DIVA) : The laboratory is responsible for vacuum measurement, for research into the desorption of materials and the development of ultra-high vacuum techniques (assemblies and tests). Its equipment includes: ? An ultra-high vacuum oven that can reach temperatures up to 1200 °C at 10-6 Pa, with temperature uniformity at 900°C of ± 3°C. ? A desorption measurement bench for qualifying materials and developing cleaning procedures necessary for ultra-high vacuums.

Hélial 4012 Liquefier-Cooler connected to Supratech station : Liquefier production is around 170 or 70 litre/hour with or without nitrogen pre-cooling. A helium compressor 80g/s (1600 m3/h) and an Air Liquide cold box make up the liquefier. Its cooling power is around 80 Watt at 1.8 K

Horizontal cryostat for cavity tests : Context High power RF characterization tests of superconducting cavities equipped with their power coupler and tuning system, at low temperature down to 1.8 K, in conditions close to their final use in an accelerator. A cylindrical horizontal cryostat (CRYHOLAB) shielded against earth magnetic field allows one to fully characterize superconducting cavities feeded with high power RF (thermal budget, Lorentz force detuning, microphonics, etc). Its dimensions are l = 1.

ISO4 clean room : Context Assembly of cavities following high pressure rinsing. Positive pressure clean room partitioned into 3 different ISO classes: 7, 5 and 4.

ISO5 clean room : Context Assembly of cavities following high pressure rinsing. Positive pressure clean room partitioned into 2 ISO classes (ISO class 7 and ISO class 5) and adjacent High Pressure Rinsing (HPR) room at ISO class 5.

Division of accelerators, cryogenics and magnetism

Institute of research into the fundamental laws of the Universe