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Place: University of Castilla-­La Mancha (UCLM), Ciudad Real, Spain

Duration: 3 days

Maximum participants: 3

Description

The participants will gain practical knowledge about the design and mounting of optical systems, ion mass spectrometry and timing synchronization between events and measurement systems. This knowledge will be very useful for a wide range of ion sources experiments where complex measurements and constraining timing conditions are frequently found.

During the Workshop the assistants will actively participate in the development and use of two diagnostics techniques in a 2.45 GHz hydrogen plasma source:  Ultra-fast Photography and Ion Mass Plasma Spectroscopy.

The Ultra-fast Photography diagnostics uses a novel system of transparent electrode that keeps the electromagnetics coupling properties of the microwave excitation system while allows the observation of the full plasma chamber volume.  An ultra-fast image acquisition system with a combination of MCP (Multichannel Plates) and CCD cameras will be used to obtain plasma pictures with 1 μs exposure times.  Special attention will be pay in the synchronism between the plasma discharge and the ultra-fast acquisition system to guarantee the proper timing.

The Ion Mass Plasma Spectroscopy diagnostics uses a quadrupole mass spectrometer for plasmas that allows to obtain mass spectrum of all present ions in the plasma between 1 and 300 amu. Once the ions species has  been identified, the system can obtain the Energy Distribution Function for each ion species with a resolution of 100 ns allowing to make a case for the synchronization between the plasma discharge and the instrument.

Plan of activities

First Day: Short introduction about the plasma discharge anatomy and functionality.  Practice on the use of the system for different settings.  Observation by nude-eye of the several plasma distributions obtained under different  experimental conditions.  Short introduction about the ultrafast image acquisition system.  MCPs and CCDs characteristics and limitations.  Necessity of a fine synchronization control and monitoring.  Short campaign of measurements.

Second Day: Disassembly of the Ultra-fast Photography diagnostics. Observation of parts for a better understanding of electrical issues related to the transparent electrodes.  Assembly of the adapter flange and the Ion Mass  Plasma Spectrometer.  Pumping of the full system. Short practical introduction about the use of the system software and instrument capabilities.  Data management and analysis of data obtained the previous day while pumping.

Third Day: Starting working with the Ion Mass Plasma Spectrometer. Identifications of ion species and impurities.  Short campaign of measurements for different settings studying the ratios between ion species.  Installation of the synchronization for time resolved measurements.  Measurements of time resolved IEDFs for each ion species during breakdown.  Analysis of results.  Final conclusions of hands-on-training workshop.

 

 

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