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CASC

General information
Access mode Physical access
Infrastructure name and acronym Cambridge Atmospheric Simulation Chamber (CASC)
Photos
Location Cambridge, United Kingdom
Website

www.ch.cam.ac.uk/person/mk594

Legal name of organisation operating the infrastructure The Chancellor, Masters and Scholars of the University of Cambridge (UCAM)
Description of the infrastructure
Brief general description of the infrastructure to which access is offered

Indoor chamber. 5.4m3 collapsible FEP bag.

20 160W ultraviolet (UV) tanning lamps (> 300 nm) for use during photochemical-aging experiments and four 75W “hard” UV lamps (242 nm) for cleaning the chamber. 

Instrumentation includes: Temperature, relative humidity, NO, NO2 (Mo converter instrument), O3, smps, PTR-ToF-MS, extractive electrospray ionisation (EESI) ultra-high resolution mass spectrometer, online reactive oxygen species instrument (OPROSI)

Unique features: Capability to monitor online and with high time resolution gaseous (PTRMS) and particle-phase molecular composition (EESI-MS) of VOC oxidation products at a molecular level. High time resolution quantification of reactive oxygen species instrument (OPROSI) to estimate particle toxicity.

Services currently offered by the infrastructure and its research environment

- Testing and inter-comparison of new instruments for particle composition.
- Studies on organic aerosol evolution and aging experiments for secondary aerosols.

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

Typical access 2-3 weeks. Set up and first data analysis in addition to that

Community/user type served

 

Academic users but open for private sector

 

Scientific and technical support offered

- Preparation of chamber experiments
- Set up of additional instruments if needed
- Design of experiment plan 
- Joint analysis of data

Logistic and administrative support offered

- Set up and installation of additional instruments
- Help in arranging travel, instrument shipping and accommodation

Person in charge of access provision at the infrastructure
Markus Kalberer
markus.kalberer@atm.ch.cam.ac.uk
Extended technical information 
Physical description  Chamber (CASC) is a 5.4 m3 (1.5m x 1.8m x 2.0 m) collapsible bag made from 125 μm FEP Teflon. The bag is suspended in an aluminium frame and entirely enclosed by aluminium sheeting and Perspex panels covered with aluminium tape to reflect light. Stainless steel ports containing stainless steel are attached to each end of the chamber to enable introduction and sampling of air from the chamber.
Mechanical description  
Irradiation spectra  
Size dependent aerosol loss/lifetime Average number-weighted particle loss rate: 0.201 h-1
Average mass weighted particle lass rate: 0.166 h-1

Size resolved particle loss rate to be updated soon
Auxiliary mechanism  To be updated soon 
Description paper  Gallimore et al., Atmos. Chem. Phys., 17, 9853–9868, 2017, Multiphase composition changes and reactive oxygen species formation during limonene oxidation in the new Cambridge Atmospheric Simulation Chamber (CASC)