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Radiation detector laboratory

Radiation detector laboratory. Joint Laboratory of Helsinki Institute of Physics and Department of Physical Sciences (coord. M.Oinonen) detector laboratory (89 m 2 ), chemistry room (21 m 2 ), irradiation room 13 m 2 and clean rooms + an electronics laboratory and a mechanical workshop.

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Radiation detector laboratory

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  1. Radiation detector laboratory • Joint Laboratory of Helsinki Institute of Physics and Department of Physical Sciences (coord. M.Oinonen) • detector laboratory (89 m2), chemistry room (21 m2), irradiation room 13 m2 and clean rooms • + an electronics laboratory and a mechanical workshop. • well equipped for development of gaseous and semiconductor detectors. R. Orava for K. Kurvinen

  2. Clean rooms • general • 2 x 64 m2 (class 1000) • 20 m2 (class 100) • Humidity, temperature & particle concentration monitored continuously • ESD (static electricity) check-point • equipment: • 2 bonders (autom. & semiautom.) • profiler • probe station • precision glue dispenser • vacuum evaporator • vacuum ovens • microscopes service corridor

  3. History:DetLab • is based on development work done • for the DELPHI Hadron Calorimeter • and the Si-MicroVertex Detector • Streamer tube components • Readout boards for the barrel • HV distribution system • Front end electronics (include. control electronics) • Slow control electronics (HV-monitoring/control, current monitoring, software) • Trigger electronics & data acquisition cards (Fastbus) • Continuous maintenance between 1989-2001 • Data analysis • MVX mechanics, Si-detectors,...

  4. DetLab is currently used by • semiconductor detector projects • CMS Tracker project ( ref. E.Tuominen) • ALICE Tracker project (ref. M.Oinonen) • CMS/Totem project (ref. R.Orava) • gaseous radiation detector projects • ANTARES X-ray astronomy project (K.Kurvinen)

  5. Development of Gaseous Radiation Detectors J.Heino, K.Kurvinen, R.Lauhakanags, A.Numminen & J.Ojala topics: Gaseous Electron Multiplier (GEM) for X-ray astronomy & Aging of gaseous radiation detectors

  6. GEM Development of GEMcollaboration with Observatory, Metorex International Inc. (& MIT) • several prototypes constructed and basic characteristics measured • new methods for producing GEM foils and readout boards studied. • readout by ASIC chips tested.

  7. GEM GEM for X-ray astronomy requirements • for low energy X-ray detection in satellite/ISS • 20% energy resolution • 0.2 mm spatial resolution • years of stable operation design • double GEM foil • orthogonal strips on R.O.B • Xe/CO2 gas mixture

  8. GEM GEM prototypes • two GEM prototypes with continuous gas flow designed, constructed and tested. • third one with sealed gas volume under construction (”space quality”) • front-end electronics enclosed in the detector gas volume (aging?)

  9. GEM Prototype I front-end electronics outside of the gas volume Prototype II front-end electronics in gas

  10. GEM Data acquisition system for GEM development Preamplifiers on ASIC HELIX 128 (University of Heidelberg) Sequencer SEQSI (Rutherford Appleton Laboatory)

  11. Unique facilities for studying aging of gaseous radiation detectors • expertise and instruments for analysis of compounds • formed in electron avalanches • outgassing from detector materials • as impurities in gas mixtures • irradiation test bench for accelerated aging tests • continuously monitored X-ray irradiation for 24h/day

  12. Chemistry of electron avalanches

  13. Chemistry of electron avalanches unique capabilities

  14. Chemistry of electron avalanches Main results of the study • 15 organic compounds formed in electron avalanches in Ar/C2H4 50/50 gas mixture analysed and identified. • production processes mostly understood. • seven compounds able to polymerize (one explosively!). • production of two compounds depends inversely on irradiation rate. • experimental data for aging model.

  15. Detector material analysis Outgassing analysis thermal desorption tube method analyzed • four polyimide grades • PET, PEN, PA polymers • PCB materials & composites • signal wires

  16. Detector material analysis

  17. Accelerated aging tests Irradiation chamber of 12 proportional counters • for testing dangerous chemical compounds found in outgassing analysis • gas flow divided into four separate sections for inclusion of different impurities • (3 detectors/section), which are monitored by CG/MS measurements

  18. Development of gaseous radiation detectors Summary • development of GEM detectors for X-ray astronomy • emphasis on long term stability and radiation hardness (aging characteristics) • capabilities for semiconductor detector R&D • applications foreseen in HEP and in industry. • the lab should be seen as a basic - and valuable - resource for all experimental hep in Finland!

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