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Spectrap Electronics

Spectrap Electronics. Latest result of commissioning and tests. Stefan Stahl measurements by Stefan Stahl & Zoran Angelkovic. m · D². t =. q² · R. Preface: main objectives. Resistive Cooling of captured ions to T = 4.2K and ion detection.

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Spectrap Electronics

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  1. Spectrap Electronics Latest result of commissioning and tests Stefan Stahl measurements by Stefan Stahl & Zoran Angelkovic

  2. m · D² t = q² · R Preface: main objectives • Resistive Cooling of captured ions to T = 4.2K and ion detection challenge : low final temperature close to 4.2K • Rotating Wall Compression • FT-ICR Detection (optional) challenge : FT-ICR and rotating wall compression at the same time

  3. Amplifiers and Filters

  4. Coils and Electronics Base Plate Teflon-isolated copper-wire on a PEEK core Base Plate connected to Alu-flange, holding The trap structure

  5. Arrival Detector Idea: Schottky Pickup Detects Arrival of Ions => and Captures the Ions Challenge: Height Image Pulse ~ 105e ~ 300µV Capture Pulse: 1kV / 25ns ~ 3Mio times higher signal on Detector STRONG Protection needed !

  6. Arrival Detector 3rd Version

  7. Arrival Detector enc = 780 erms (elementary charges)

  8. Integration Test at 300K and 77K • Cryogenic Biasing Filters • Axial Amplifiers (GaAs FETs) • Cyclotron Amplifiers • All together in Conjunction with Room Temperature Box

  9. Amplifier/Resonator Noise Tests, 77K 1.5MHz-coil 500kHz-coil Cyclotron Detector:

  10. Summary and Outlook • All amplifiers and filters have been successfully tested at 300K and 77K • Cooling Resonators work as expected • Integration tests (300K & 77K) have been accomplished successfully • Arrival Detector (3rd version) has been improved and tested at 4.2K, enc = 780e rms To do (next weeks) • Tests WITH trap mounted and connected to electronics, adjust resonator frequencies @ 300K • Test Rotating Wall coupling to electrodes • Final integration test inside magnet and at 4.2K • Software control of devices

  11. Thanks a lot for your attention. Email:s.stahl@stahl-electronics.com www.stahl-electronics.com

  12. Spare Slides:

  13. Examples of Coil-Design

  14. x y Detection of Image Charges, FT-ICR Pickup-Elektrode Pickup-Elektrode

  15. x y Detection of Image Charges, FT-ICR Pickup-Elektrode ion current signal I t Pickup-Elektrode

  16. Signal strength x y D ~ distance of pickup electrodes very small signal ~fA Detection of Image Charges, FT-ICR Pickup-Elektrode ion current signal I Pickup-Elektrode

  17. x y very small signal ~fA Detection of Image Charges, FT-ICR Pickup-Elektrode q/m spectrum ion current signal I I f t „FT-ICR“ Fourier-Transform Ion Cyclotron Resonance Pickup-Elektrode

  18. Detection of Image Charges, FT-ICR • Method is non-destructive • Many ion species can be detected at the same time • Small sensitivity to space charges compared to TOF • Useful over a very wide range of ion numbers

  19. FT-ICR Circuitry

  20. First H2O+ Resonance:

  21. Shot Noise by Ions and Electrons Creating shot noise while flying through  1010 electrons/sec. ~ 6 fA/ (Hz)1/2  1012 ions/sec. ~ 700 fA/ (Hz)1/2

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