Studies for Aluminum photo-ionization in hot cavity for the SPES Project

Studies for Aluminum photo-ionization in hot cavity for the

SPES Project

Daniele Scarpa

The target ion source complex

Target complex

Ion Source complex

The TIS SPES Laboratories

HT LNL Lab Test Bench LNL Lab

Carbide Chemistry LNL Lab

UCx Chemistry PADOVA Lab

Laser PAVIA Lab

The target ion source complex

Target complex

Ion Source complex

Surface Ion source1 2

H He3 4 5 6 7 9 10

Li Be B C N O F Ne11 12 13 14 15 16 17 18

Na Mg Al Si P S Cl Ar19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36

K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54

Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe55 56 57 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86

Cs Ba La Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn87 88 89 104 105 106 107 108 109 110 111 112

Fr Ra Ac Rf Db Sg Bh Hs Mt

8

Elements with bad volatility (NOT EXTRACTED)

Surface Ionization Method

Laser beam

Laser with SIS

Photo Ionization Method

Plasma Ionization Method

IONIZATION methods for SPES n-rich RIB’s(3 methods, 2 Ion sources)

Main fission (p-> 238U) fragmentsPlasma Ion source

Studies for Aluminum photo-ionization in hot cavity for the SPES project

Outline:

• Aluminum

• Pavia activities

• LNL activities

• Conclusion

Why Aluminum

[1] Barbui et all. Nuclear Instruments and Methods in Physics Research B 266 (2008) 4289 – 4293

SPES has developed a SiC target tested at HRIBF in Oak Ridge

Aluminum comes from (Si,p) nuclear

interaction



Outline:

• Aluminum


• LNL activities

• Conclusion

Laboratories setups

Pavia Laboratory


ND-YAGLPD3002

+ SGHHCL

Aluminum

532 nm Tunable

LNL Laboratory

LPX200XeCl

SPES Hot Cavity

308 nmLPX200

XeClFocalizationtelescope

308 nm

Testing Aluminum Laser Ionization: Hollow Cathode Lamp

Optogalvanic effects are changes in the conductance of a gas discharge caused by absorption of light via a bound-ionization states transition in an atom or molecule in the discharge.

Good & Simple Atoms Reservoir

Very Suitable for Spectroscopic Investigations


Slow optogalvanic signal

System goes to the new electronic states equilibrium after some microsec sharing the energy delivered by laser

resonant photonsE1

E0

E2

Φ


System releases electrons immediately due to the direct photoionization

E1

E0

E2

Φ

Fast optogalvanic signal


Aluminum selective laser ionizationTwo step, one color ionization path: Al [308.216;308.216 e−] Al+

λ

λ

First step:Resonant λ =308,216 nm

Second step:Non – resonant

towards continuum

same wavelength

λ =308,216 nm


Typical transition linewidth


Outline:

• Aluminum


• LNL activities

• Conclusion

Mass Maker Technique

Oven tube loaded with Aluminum salts and heated by current

Aluminum evaporates and goes into hot cavity


Laser beam delivery


Laser beam shape study in order to focalize into hot cavity

3 mm diameter 6 m far awayLaser safety study with Jesus Vasquez

Ion beam vs laser beam (Top View)

Laser ionization at SPES

Laser Beam

Ion Beam

Ion Source – Hot Cavity

Faraday Cup

Ion beam delivery

Faraday cup is off-center

respect hot cavity and laser

beam-

Ion focused into the FC by the quadrupole

Laser ionization at SPES

Ionization first results (Faraday Cup Current)

Laser offLaser On


Prel

imin

ary

Ionization resultsFaraday Cup Current @ several pulse energy and frequency

20 Hz ; 12 mJ per pulse

20 Hz ; 20 mJ per pulse


50 Hz25 Hz

12 Hz

off

Preliminary

Conclusions:


• Spectroscopic analysis of Al.

• Front end alignment for laser ionization

• First LNL measurements with laser on Aluminum

• LNL Measure with Wien filter

Thank You

Thank You

Documents

Studies for Aluminum photo-ionization in hot cavity for the SPES Project