General information
Access mode Remote and physical access: instrument calibration
Infrastructure name and acronym AIDA Calibration Centre for Cloud Physics (ACcloud)
AIDA round
Location Eggenstein-Leopoldshafen, Germany
Legal name of organisation operating the infrastructure Karlsruhe Institute of Technology (KIT)
Description of the infrastructure
Brief general description of the infrastructure to which access is offered

The AIDA Calibration Centre for Cloud Physics (ACcloud) uses the 84.5 m3 volume aluminium aerosol and cloud simulation chamber AIDA for calibration of hygrometers and ice nucleating particle (INP) instruments. The AIDA chamber can be operated at variable pressure (0.01 to 1000 hPa), temperature (+50°C to -90°C), and humidity conditions including supersaturations with respect to ice and liquid water. Its capabilities to simulate upper tropospheric/lower stratospheric conditions and to generate supersaturations and clouds in a large volume are unique in Europe. The AIDA facility is equipped with an extensive suite of state of the art and reference instruments, both commercial and custom built. 
Hygrometers can be mounted inside the AIDA chamber for calibration at both cloud-free and cloudy conditions or sample from the AIDA chamber for calibration in a wide range of water partial pressures. Dense clouds can be used as reference point with a relative humidity of close to 100%. The INP instrument calibration is offered for reference aerosols with known INP concentration determined by well-documented and validated series of AIDA cloud expansion experiments. During the INP calibration runs, the AIDA chamber will also serve as a stable and well-characterized aerosol reservoir.

Services currently offered by the infrastructure and its research environment

The ACcloud offers calibration of atmospheric hygrometers and ice nucleating particle (INP) instruments.  

Modalities of access and support offered under EUROCHAMP-2020
Typical duration of work

Calibration of atmospheric hygrometers and ice nucleating particle (INP) instruments using the AIDA have typically a duration of 5 days with 1-2 days for set up and 3-4  days for the calibration at different AIDA conditions.

Community/user type served

Research groups from atmospheric science community make up the vast majority of the users. A few innovative companies use the AIDA chamber for instrument development, testing and comparison.

Scientific and technical support offered The AIDA team offers support for planning the calibrations including adaptation of instruments to the AIDA chamber. 
Logistic and administrative support offered The AIDA team offers support for transport of instruments (help with customs or shipment companies) and help with local accommodation (on site apartments or hotels).
Person in charge of access provision at the infrastructure Dr. Ottmar Möhler, head of calibration center,
Dr. Harald Saathoff, TNA coordinator,
Usually all leading scientists at the AIDA facility support the transnational access activities. Please contact us to discuss calibration opportunities and possible dates.