UL UNIVERSIDADE DE LISBOA CENTRO DE FÍSICA NUCLEAR Nupecc Workshpo on Small-Scale Accelerator...

UL UNIVERSIDADE DE LISBOA

CENTRO DE FÍSICA NUCLEAR

Nupecc Workshpo on Small-Scale Accelerator Faccilities, Crete 7-8 September 2007

People:

Senior Researchers (responsible for activity lines):

Eduardo Alves (Head of Lab)

Adelaide Pedro de Jesus

Luís Cerqueira Alves

Miguel Reis

Nuno Barradas

Rui Coelho da Silva

Teresa Pinheiro

Ulrich Wahl

ITN/CFNUL Ion Beam Laboratory

http://cfnul.cii.fc.ul.pt/

http://www.itn.pt/







ITN/CFNUL Ion Beam Laboratory

Van de Graaff 2.5 MV

DanFisik Implanter 210 kV

General Ionex Cockroft-Walton tandetron 3 MV




Van de Graaff

2.5 MV, 10 A (protons); H, He ions

Lines:

PIXE/Nuclear Reactions

RBS, Chan, ERDA

- probe

PIXE analysis of environmental, biomedical, material science, geological, art,….. samples

Nuclear Reactions for astrophysicsDevelopment of a PIGE methodology

Advanced Materials:Wide bandgap semiconductors and oxides Nuclear fusion reactor materials and mineralogical samples. Multiple quantum wells and quantum dots.

Materials ScienceBiomedicineEnvironmentArchaeometry and ArtMineralogy




RBS & Channeling

PIXE

Bending Magnet

Switching Magnet

Stabilising slits

Object aperture

Collimator aperture

Scan coils

Quadrupole lenses

Si(Li)

TargetA

A

2.0

m4.

30 m

1.0

m

Van de G raaff

Concrete table

M

A - Surface barrier detectorsM - Microscope

A nalytical TechniquesP I XER B SSTI MCSTI MI B I CI B I L

~100 pA for PIXE and RBS(Res. ~ 34 µm2)

Spatial Resolution

~1 fA transmission work(Res. 1 1 µm2)

Oxford Microbeams triplet system with OMDAQ and DAN32 software

STIM – Scanning Transmission Ion MicroscopyCSTIM – Channeled STIMIBIC – Ion Beam Induced ChargeIBIL – Ion Beam Induced Luminescence



Advanced Materials for Nuclear Fusion Reactors

6Li(n,)3HLi ceramic breeders

ITER International Thermonuclear Experimental Reactor

StructureStainless steels

SiC composites

Be as neutron multiplier 9Be(n,2n)2

Impurities - generation of long-lived isotopes

Chemical reactions

Objectives




Advanced Materials for Nuclear Fusion Reactors


Titanium Beryllides

Objectives:Structural characterisation.Oxidation after annealing in air at 800º C.

530 µm

Ti

Fe

200 400 600 800 10000

20

40

60

80

100

120

140

160

180

Ti

O

virgem 800ºC 2h 800ºC 16h

Co

un

ts

Channel

Be 5Ti

Be

UL UNIVERSIDADE DE LISBOACENTRO DE FÍSICA NUCLEAR


Sb Ga In

Max.

Min.

1060 µm

Crystal qualityManufacturing Control

200 400 600 800 1000 1200 1400 1600 1800 2000100

101

102

103

104

105

In L

Sb K

In K

Sb L Ga K

Co

un

ts

Channel

200 400 600 800 1000 1200 1400 1600 1800 2000100

101

102

103

104

105

In L

Sb K

In K

Sb L Ga K

Co

un

ts

Channel

200 400 600 800 1000 1200 1400 1600 1800 2000100

101

102

103

104

105

In L

Sb K

In K

Sb L Ga K

Co

un

ts

Channel

ThermoPhotoVoltaic cell




Fe Cu

Pb Zn

Ancient stained glass

Glass and paint compositionCorrosion studies

Cross section analysis




External Microbeam end-station

External Microbeam end-station

13.2 mm

42

53

1

150 mm

1 - exit nozzle + 100 nm thick Si3N4 membrane 2 - X-ray detector3 - RBS detector4 - microscope5 - vacuum chamber

0 20 40 60 80 100 120 140

50

100

150

200

250

Inte

ns

ity

(a

.u.)

Distance (µm)

0 20 40 60 80 100 120 140

50

100

150

200

250

Inte

ns

ity

(a

.u.)

Distance (µm)

490 µm

500 µm

100 µm

HorizontalGaussian FWHM = 70 µm

VerticalGaussian FWHM = 75 µm

Going on Developments




General Ionex Cockroft-Walton tandetron 3MV

NEC Alphatros ion source for He beams Negative ion direct-extraction Duoplasmatron ion

source for H- beams. HICONEX Cs beam multielement negative ion

source




15 eV resolution (Transition Edge Superconductor -TES) detector

Tandem new lines of activity

Molecular speciation from PIXE spectra

Heavy Ion Elastic Recoil Detection analyses (HIERDA) – A ToF system is under construction to profile light ions using either Cl or I beams.









HICONEX Cs microbeam (30-300 m) multielement ("AUSTRALIS") negative ion source C Conventional HICONEX Cs beam multielement negative ion source

Two beamlines for AMS:

A) for 14C dating: 2 off-center Faraday cups for parallel current measurementof 12C3+ and 13C3+, while the 14C3+ detection is by means of an electrostatic analyzer and a gas proportional counter.

B) Heavy ion ("AUSTRALIS") beamline: The magnet is able of analyzing 6+ (or higher charge state) ions of all elements up to U at 2.5 MV terminal voltage.Sequential analysis of different isotopes (around +-3% of center mass) in the magnet is possible by means of the "fast bouncing" technique, i.e. by means of electrostatic deflectors which can be switched at >10 ms time intervals





Astrophysics Programme

Feasibility Study of AMS for the reaction:

51V(3He, n)53Mn

Carbon burning processes

(collab with Claus Rolfs)

Particle

Gamma

Reaction product (AMS)

Detection

High current ion source

Reaction beam line

Each case is a new case

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UL UNIVERSIDADE DE LISBOA CENTRO DE FÍSICA NUCLEAR Nupecc Workshpo on Small-Scale Accelerator...

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