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

Spectrap Collaboration Meeting, 1. March, 2010 Spectrap Evaluation of Cryogenic Components Preface: main objectives challenge : low final temperature close to 4.2K Resistive Cooling of captured ions to T = 4.2K and ion detection Resistive Cooling of captured ions to T = 4.2K and ion detection Rotating Wall Compression Rotating Wall Compression FT-ICR Detection (optional) FT-ICR Detection (optional) challenge : FT-ICR and rotating wall compression at the same time  m · D² q² · R

Spectrap Collaboration Meeting, 1. March, 2010 Spectrap Evaluation of Cryogenic Components Amplifiers and Filters

Spectrap Collaboration Meeting, 1. March, 2010 Spectrap Evaluation of Cryogenic Components Coils and Electronics Base Plate Teflon-isolated copper-wire on a PEEK core Base Plate connected to Alu-flange, holding The trap structure

Spectrap Collaboration Meeting, 1. March, 2010 Spectrap Evaluation of Cryogenic Components Arrival Detector Idea: Schottky Pickup Detects Arrival of Ions => and Captures the Ions Challenge: Height Image Pulse ~ 10 5 e ~ 300µV Capture Pulse: 1kV / 25ns ~ 3Mio times higher signal on Detector STRONG Protection needed !

Spectrap Collaboration Meeting, 1. March, 2010 Spectrap Evaluation of Cryogenic Components Arrival Detector 3rd Version

Spectrap Collaboration Meeting, 1. March, 2010 Spectrap Evaluation of Cryogenic Components Arrival Detector enc = 780 e rms (elementary charges)

Spectrap Collaboration Meeting, 1. March, 2010 Spectrap Evaluation of Cryogenic Components Integration Test at 300K and 77K Cryogenic Biasing Filters Axial Amplifiers (GaAs FETs) Cyclotron Amplifiers All together in Conjunction with Room Temperature Box

Spectrap Collaboration Meeting, 1. March, 2010 Spectrap Evaluation of Cryogenic Components Amplifier/Resonator Noise Tests, 77K 500kHz-coil 1.5MHz-coil Cyclotron Detector:

Spectrap Collaboration Meeting, 1. March, 2010 Spectrap Evaluation of Cryogenic Components 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 Tests WITH trap mounted and connected to electronics, adjust resonator 300K Test Rotating Wall coupling to electrodes Final integration test inside magnet and at 4.2K Software control of devices To do (next weeks)

Spectrap Collaboration Meeting, 1. March, 2010 Spectrap Evaluation of Cryogenic Components Thanks a lot for your attention.

Spectrap Collaboration Meeting, 1. March, 2010 Spectrap Evaluation of Cryogenic Components Spare Slides:

Spectrap Collaboration Meeting, 1. March, 2010 Spectrap Evaluation of Cryogenic Components Examples of Coil-Design

Spectrap Collaboration Meeting, 1. March, 2010 Spectrap Evaluation of Cryogenic Components Pickup-Elektrode x y Detection of Image Charges, FT-ICR

Spectrap Collaboration Meeting, 1. March, 2010 Spectrap Evaluation of Cryogenic Components Pickup-Elektrode ion current signal I t Detection of Image Charges, FT-ICR x y

Spectrap Collaboration Meeting, 1. March, 2010 Spectrap Evaluation of Cryogenic Components Pickup-Elektrode ion current signal I Detection of Image Charges, FT-ICR x y very small signal ~fA Signal strength D ~ distance of pickup electrodes

Spectrap Collaboration Meeting, 1. March, 2010 Spectrap Evaluation of Cryogenic Components Pickup-Elektrode ion current signal q/m spectrum I I t f x y very small signal ~fA Detection of Image Charges, FT-ICR „FT-ICR“ Fourier-Transform Ion Cyclotron Resonance

Spectrap Collaboration Meeting, 1. March, 2010 Spectrap Evaluation of Cryogenic Components 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 Small sensitivity to space charges compared to TOF Useful over a very wide range of ion numbers Useful over a very wide range of ion numbers

Spectrap Collaboration Meeting, 1. March, 2010 Spectrap Evaluation of Cryogenic Components FT-ICR Circuitry

Spectrap Collaboration Meeting, 1. March, 2010 Spectrap Evaluation of Cryogenic Components First H 2 O + Resonance:

Spectrap Collaboration Meeting, 1. March, 2010 Spectrap Evaluation of Cryogenic Components Shot Noise by Ions and Electrons Creating shot noise while flying through electrons/sec. ~ 6 fA/ (Hz) 1/ ions/sec. ~ 700 fA/ (Hz) 1/2 