spectrap electronics stefan stahl measurements by stefan stahl & zoran angelkovic latest result...

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 objectivesPreface: main objectives

challenge : low final temperature close to 4.2K

• Resistive Cooling of captured ions to T = 4.2K and ion detectionResistive Cooling of captured ions to T = 4.2K and ion detection

• Rotating Wall CompressionRotating 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 FiltersAmplifiers and Filters

Spectrap Collaboration Meeting, 1. March, 2010

Spectrap Evaluation of Cryogenic Components

Coils and Electronics Base PlateCoils and Electronics Base Plate

Teflon-isolated copper-wireon a PEEK core

Base Plate connectedto Alu-flange, holdingThe trap structure

Spectrap Collaboration Meeting, 1. March, 2010

Spectrap Evaluation of Cryogenic Components

Arrival DetectorArrival DetectorIdea: Schottky Pickup Detects Arrival of Ions => and Captures the Ions

Challenge: Height Image Pulse ~ 105e ~ 300µVCapture Pulse: 1kV / 25ns ~ 3Mio times higher signal on Detector

STRONG Protection needed !

Spectrap Collaboration Meeting, 1. March, 2010

Spectrap Evaluation of Cryogenic Components

Arrival DetectorArrival Detector

3rd Version

Spectrap Collaboration Meeting, 1. March, 2010

Spectrap Evaluation of Cryogenic Components

Arrival DetectorArrival Detector

enc = 780 erms (elementary charges)

Spectrap Collaboration Meeting, 1. March, 2010

Spectrap Evaluation of Cryogenic Components

Integration Test at 300K and 77KIntegration 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, 77KAmplifier/Resonator Noise Tests, 77K

500kHz-coil 1.5MHz-coil

Cyclotron Detector:

Spectrap Collaboration Meeting, 1. March, 2010

Spectrap Evaluation of Cryogenic Components

Summary and OutlookSummary 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 frequencies @ 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 foryour attention.

Email: s.stahl@stahl-electronics.com www.stahl-electronics.com

Spectrap Collaboration Meeting, 1. March, 2010

Spectrap Evaluation of Cryogenic Components

Spare Slides: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

Pickup-Elektrode

x

y

Detection of Image Charges, FT-ICRDetection of Image Charges, FT-ICR

Spectrap Collaboration Meeting, 1. March, 2010

Spectrap Evaluation of Cryogenic Components

Pickup-Elektrode

Pickup-Elektrode

ion currentsignal

I

t

Detection of Image Charges, FT-ICRDetection of Image Charges, FT-ICR

x

y

Spectrap Collaboration Meeting, 1. March, 2010

Spectrap Evaluation of Cryogenic Components

Pickup-Elektrode

Pickup-Elektrode

ion currentsignal

I

Detection of Image Charges, FT-ICRDetection of Image Charges, FT-ICR

x

y

very smallsignal ~fA

Signal strength

D ~ distance of pickup electrodes

Spectrap Collaboration Meeting, 1. March, 2010

Spectrap Evaluation of Cryogenic Components

Pickup-Elektrode

Pickup-Elektrode

ion currentsignal

z

Voltage/Current Amplifier

Pe nning Tra p(c ro ss se c tio n)

ra d ia lly sp lit e le c tro d eslit

FFTFou rie r-Transfo rm - spectra l analyser

excited ion

m agnetic fie ld

low noiseAm p.

timetime-domain frequency-domain

I

frequency

dP /d fion current signal

mass spectrum

FFT

q/mspectrum

II

t f

x

y

very smallsignal ~fA

Detection of Image Charges, FT-ICRDetection 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-ICRDetection 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 TOFSmall sensitivity to space charges compared to TOF

• Useful over a very wide range of ion numbersUseful over a very wide range of ion numbers

Spectrap Collaboration Meeting, 1. March, 2010

Spectrap Evaluation of Cryogenic Components

FT-ICR CircuitryFT-ICR Circuitry

Spectrap Collaboration Meeting, 1. March, 2010

Spectrap Evaluation of Cryogenic Components

First HFirst H22OO++ Resonance: Resonance:

Spectrap Collaboration Meeting, 1. March, 2010

Spectrap Evaluation of Cryogenic Components

Shot Noise by Ions and ElectronsShot 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