Multiple-Reflection Time-of-Flight Mass Spectrometers

Stabilization Boxes

Samuel Ayet San Andrés

s.ayet@gsi.de

HV Pulser + Stabilization

HV PULSER (LOW POWER ~ 5W, HV):

• Switching frequency: DC to 200kHz

•Minimum pulse width of ~ 200 ns

•Voltage stability (HV+) under 1ppm for hours

• Maximum differential voltage HV+ to HV- of 2.5kV

• Maximum absolute voltage HV+ and HV- of 5kV

HV -

OUTHI = HV+STABILIZED HIGH

VOLTAGE

PULSER

HV + Stabilized

TTL GALVANIC

INSOLATION

HV+

LPF

STABILIZATOR

OUTLOW = HV-

HV + Stabilized

<1ppm

HV-

High Voltage Pulser - High Voltage Stabilization Box

HV Pulser – Half Bridge Push-Pull

HV Pulser + Stabilization

IN TTL

HV OUT

LOAD: 1m RG-58

10kHz Rep. Rate

HV Pulser - Signal

Time-of-Flight Analyzer:

• 8 Stabilized Electrodes | Pulsed & Non-Pulsed

• 4 pulsed (~kV) | 4 non pulsed (~kV)

• Symmetric EL 1.X = EL 2.X (half turn delayed)

P EL 1.1

P EL 1.2 NP EL 1.3

NP EL 1.4

NP EL 2.4

NP EL 2.3 P EL 2.2

P EL 2.1

MR-TOF-MS

Time-of-Flight Analyzer

Trap System

Broadband Mode

t

A

MR-TOF-MS

~1m

TOF Analyzer

Post Analisys Reflector

Detector and gate

𝑞𝐸 = 1

2𝑚𝑣2

𝑣 = 𝑙

𝑡

t

Broadband Mode

High Resolution Mode

A

A

t

MR-TOF-MS

0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0

-1.00

-0.75

-0.50

-0.25

0.00

0.25

0.50

0.75

1.00

T

OF

De

via

tion

(p

pm

)

Time (h)

TOF = 15.33256 ms | FWHM ~ 20 ns | 133Cs+

Ion Time-of-Flight Stability

MR-TOF-MS @ GSI

MR-TOF-MS @ JLU

10-7 mbar

Vacuum Separation

0.5

m

RFQ Cooler

Injection Trap

Einzel lens

Mass filter

TOF Analyzer

Mass Range Selector

Ion guide

Skimmer Lens

Heated capillary

10-2…10-4 mbar

10-2 mbar

API

MCP Detector

1 bar

1.2 m

0.8 m

Inlet

TITAN @ TRIUMF

RF

Injection

Trap

MCP

Thank You!