Testing the Penning trap (operated as a Paul trap)

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

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

Zoran Anđelković First Results Dependence on the trap voltage as expected Strong dependence on RF amplitude Paul trap stability diagram q z ~ RF amplitude a z ~ V dc Detected number of ions Trap voltage [V] Bias Voltage: 37 VTrapping time 2 sRF apmpitude 300 V (1 MHz)

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

Laser system & Locking

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

Zoran Anđelković Laser Linewidth Measurements Laser and FPI linewidth convolution Sutalble for most applications

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

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

Zoran Anđelković Locking Stability Laser in lock – error signal drifts around the zero Out of lock – error signal drifts randomly

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

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