MATS/LaSpecStatus report

Alexander HerlertFAIR GmbH

on behalf of the MATS and LaSpec Collaborations

Thanks to W. Nörtershäuser, D. Rodríguez, P. Campell, I. Moore, and G. Neyens for providing slides/material

NuSTAR Week 2011, Bucharest, October 17-21, 2011

Precise Measurements on very short-lived nuclei using an Advanced

Trapping System

Laser Spectroscopy on very short-lived nuclei

MATS & LaSpec stands for

10 countries, 24 institutes, 87 members

8 countries, 13 institutes, 34 members

RFQ cooler & buncher

MR-TOF

MATS

EBIT

Laser Spectroscopy

Dipole magnet

Gas cell

for more information see: Technical Design Report of MATS & LaSpec:D. Rodriguez, K. Blaum, W. Nörtershäuser et al.EPJ Special Topics 183 (2010) 1-123

MATS & LaSpec at the LEB/FAIR

Technical Design Report of MATS & LaSpec:D. Rodriguez, K. Blaum, W. Nörtershäuser et al.EPJ Special Topics 183 (2010) 1-123

RFQ: JYFL

ß-NMR: Leuven

Collinear Ion Beamline:Manchester

Collinear Atom Beamline + Optical Pumping: Mainz

MATS & LaSpec at the LEB/FAIR

Turbo

Simulation results:• Emittance ~6π mm mrad, ΔE~ 3 eV, δT ~3 ms

for 2 keV pulse of ejected 133Cs+ when using buffer gas at 80 K.

• 80% injection efficiency, when assuming parallel beam d=4 mm, (40 kV) before deceleration

Electrode design similar to ISCOOL

Valve

DecelerationQP deflector+einzel

Insulator

Turbo

Valve

Mini RFQ

RFQ trap

He in (0.04 mbar)Drift tube & acceleration

Turbo

3-stage rf cooler for MATS and LaSpec

• Mass measurements have been already performed• Important work going on the ion source (helios) in order to make practicable more elements from the californium source

K. Blaum, W. Nörtershäuser et al (MPIK)

Layout of the TRIGA-Spec experiment

common beamline

Recently added:RFQ cooler and buncher

(COLETTE)

Prototyping & Development @ TRIGA-Spec

Status of the LASPEC Prototype at the TRIGA-Reactor in Mainz

D.

Lun

ney,

NIM

A59

8 (

200

9) 3

79-3

87

beam diagnostics for MATS and LASPEC

(MCP and imaging optics for beam profile control)

build and testing

laser spectroscopy on praseodymium

(preparatory work under realistic conditions for on-line runs, e.g. at ISOLDE)successfully tested

RFQ cooler and buncher

(in preparation for on-line coupling to the reactor) currently comissioning

ISOLDE, CERN

TRIGA, Mainz

Titelmasterformat durch Klicken bearbeiten Laser Spectroscopy of

Highly Charged Ions and Exotic Radioactive Nuclei

Status of the LASPEC Prototype at the TRIGA-Reactor in Mainz

Optical pumping & Conetraps

P. Reinhed et al., NIM A621 (2010) 83

- Use intra cooler optical pumping to selectively populate desired ionic state

- Greatly enhanced efficiencies and spectroscopic access to previously

“impossible” elements

-Can be used in electrostatic traps which double as “energy elevators”

in LaSpec

A new optical detection region for Collinear Laser Spectroscopy

Optical detection efficiency improved by factor 10 + background photon detection reduced by 50% !

100 mm Ø aspheric lenses

Electron Tubes 9658B2” PMT , S20 IR sensitive photocathode

Laser / K beam detected region

0 50 100 150 200 250 300 350 40002468

1012141618

Distance from CEC chamber (mm)

Ligh

t co

llecti

on e

ffici

ency

%

Simulated efficiency of new and previous set-up: gain ≈ 14x

Mark Bissell et al., NIM, in preparation

(Design: M.L. Bissell, K.U. Leuven, Belgium)

Use refrigerant circulator FP40-MC to cool photocathode to -30C via Cu heat exchanger.

Experimental sequence for MATS

Gas catcher

RFQ buncher

MR-TOF-MS

PreparationPenning trapEBIT

MeasurementPenning

trap

Detectortrap

MR-TOF-MS (UGießen)

10-8 mbar

Kinetic Energy1.5 keV

CurvedRFQs

DifferentialPumpingSection

Injection Trap System

Time-of-FlightAnalyzer

10-4 mbar

10-2 mbar

EnergyBuncher

Ion Gate IsochronousSEM

Post-AnalyzerReflector

Gate Detectors

InternalIon Source

10-6 mbar

Ions

SeparatedIons

Mass Measurement

Aux. Detector

133Cs+ 12 ms TOF

• Mass resolving power (FWHM) m/m = 100,000 (5 ms TOF)• Isobar separation

Demonstrated for C6H6 and 13C12C5H5 (Intensity ratio 170:1, m = 4 MeV)• Ion capacity

> 104 per cycle and >106 per second

W. R. Plass et al

Test for the LEB: MR-TOF-MS at the FRS Ion Catcher

Multiple-reflection TOF-MSIsobar separation

direct m ass m easurem ents

on iden tifica tion,i

RFQ Beam LineIon coo ling, transm ission,

d ifferen tia l pum ping, iso tope separa tion,

d iagnosis, beam distributionintroduction of re ference ions

~ GeV/u ~ M eV/u ~ eV ~ keV

Cryogenic Stopping CellStopping, therm alization,

extraction

Fragm ent Separator FRSProduction, separa tion and

range-bunch ing

MR-TOF-MS was commissioned successfully at the FRS Ion Catcher in the S411 experiment (07.10. - 12.10.2011)!

(See talk by H. Geissel)

W.R. Plaß et al., GSI Scientific Report 2010, p. 137 (2011)

1. High electron current up to 2000 mA.2. High ion densities: 106 to 1010 ions/cm3

10-4 10-3 10-2 10-10.0

0.2

0.4

0.6

0.8

1.0

Ne-like Fe16+

Fra

ctio

n of

ions

in c

harg

e st

ate

Charge breeding time (s)

He-like Fe24+

6 keV, 2 A electron beam. Current density 1400 A/cm2, background pressure 10-10 mbar (H2), ion temperature 300 eV. The calculation includes radiative recombination and charge exchange.

EBIT (MPIK Heidelberg)

(Courtesy of J.R. Crespo)

(EBIT at TRIUMF)J. R. Crespo et al (MPIK)

Penning traps (UGW, MPIK Heidelberg, GSI, UGR)

(Courtesy of J.R. Crespo)

• Study of the injection of ions into the field of a 12 T Magnet (UGW)• Design of an alignment support for the trap (UGW)

(Superconducting magnet at UGW )(L. Schweikhard, G. Marx et al)

10 15 20 25

cluster size n

Aun

1-

Ion detection for the Penning traps (UGR, MPIK, UGW)

1. Cryogenic environment and UHV.2. Broad-band mass identification

Detection in the preparation Penning trap

The detection in the measurement Penning trap: FT-ICR for single ion sensitivity

C. Weber PhD Thesis (UM)R. Ferrer, PhD Thesis (UM)

Amplifier in vacuum (UGR)D. Rodríguez et al

Amplifier in air (UGR)

Coil for single ion Detection (UGR)

Technical drawing of the setup at UGR for FT-ICR tests J. M. Cornejo, Master thesis (UGR)

The Detector Trap (LMU Munich)mock-up: detector carrier boards between trap electrodes

cryotest: lN2 temperature, selection of groove dimensions

Characteristics:• Replace inner Penning trap electrode by

cubic setup of 4 Si-strip detectors • Use detector bias for trapping potential

Penning trap electrodes:

• Detector dimensions given by: space in magnet bore, required position resolution, efficiency optimization

• Detectors need to comply with UHV and cryogenic conditions

strip detector

(P. Thirolf et al)

Developments also carried out at PNPIAn funding has been received

Off-line ion source (PNPI)

Y. Nu. Novikiov et al

Funding ID (Preconstruction-MoU)

Status and perspectives

• FAIR will offer unique opportunities with RIB• MATS & LaSpec will incorporate the most advanced technical developments on ion

traps, lasers and beam preparation • The Technical Design Report was approved in May 2010• Several groups have received funding to start the construction of the different

components• A large number of laser and Penning trap setups at different European institutes,

universities and RIB facilities can be used for developing very advanced components (MPI-K, JYFL, ISOLDE, KVI, GSI, TRIGA, UGR, UGW, UG, SPIRAL2...)

• MATS can be tested and can be ready before FAIR is in operation• Unfortunately, the first stage of the modularized start version of FAIR does not

include the low energy beam line where MATS & LaSpec will be placed