Testing the Penning trap (operated as a Paul trap) - PowerPoint PPT Presentation

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Testing the Penning trap (operated as a Paul trap)

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Testing the Penning trap (operated as a Paul trap)
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Testing the Penning trap (operated as a Paul trap)

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  1. Testing the Penning trap (operated as a Paul trap)

  2. endcap ring endcap DC trap potential + - RF ~ bias potential + DC - ground Trap Test - The Experimental Setup -3kV +250 V 100 eV Faraday cup Einzel lens Ar+ source Trap testing: • Vary the trapping time • Vary the trapping voltages • Monitor the ion count pA Capturing and storing Detection Zoran Anđelković

  3. Overview of the System Trap and optics voltage supplies Measuring cycle Channeltron Zoran Anđelković

  4. First Results • Dependence on thetrap voltage as expected • Strong dependence on RF amplitude az ~ Vdc Bias Voltage: 37 V Trapping time 2 s RF apmpitude 300 V (1 MHz) Detected number of ions qz ~ RF amplitude Trap voltage [V] Paul trap stability diagram Zoran Anđelković

  5. Trap Test - Results Trap voltage: 10 V Bias voltage 71 V RF apmpitude 300 V (1 MHz) Detected number of ions • Exponential decay expected • Storage time vs. ion count – “dead time” problems • Good results at low ion counts Zoran Anđelković

  6. Laser system & Locking

  7. Laser - An Overview of an ECDL • External Littrow resonator • Single mode operation • Simple and fast constr-uction • Cheap components Zoran Anđelković

  8. Laser Linewidth Measurements • Laserand FPI linewidth convolution • Sutalble for most applications Zoran Anđelković

  9. Laser Locking and Stabilization to experiment LASER Faraday rotator Variable attenuator PD 1 PD 2 ReferenceFPI Differential amplifier Simulated by reference electronics Zoran Anđelković

  10. Laser Setup Overview • Successful locking for more than 30 min. • Up to 2 GHz scanning range • Scannable Zoran Anđelković

  11. Locking Stability • Laser in lock – error signal driftsaround the zero • Out of lock – error signal driftsrandomly Zoran Anđelković

  12. Spectroscopy Test Thermal Li atom source • Results: • fluorescence at 671 nm • two hyperfine components The assembled laser system Zoran Anđelković

  13. Improvement and Outlook Further improvement: • Locking of the FPI to a He-Ne • Broader (mode-hop free) scanning rang • Test – spectroscopy inside the trap Implementation: • Penning trap under construction at GSI • Operation of the laser system with different wavelengths (laser diodes) • First SPECTRAP experimentsexpected during 2009 Zoran Anđelković