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Advances in Cryogenic Ion Detection: Commissioning Results and Performance Tests

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This report summarizes the latest results from commissioning and tests conducted by Stefan Stahl and Zoran Angelkovic on advanced ion detection systems. Key challenges addressed include resistive cooling of captured ions to 4.2K, integrating rotating wall compression with FT-ICR detection, and the development of an improved arrival detector. Successful tests at both 300K and 77K demonstrate the functionality of amplifiers, filters, and resonators, while preparing for final integration inside a magnetic field. Software control of devices is also highlighted as part of ongoing advancements.

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Advances in Cryogenic Ion Detection: Commissioning Results and Performance Tests

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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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