New Configuration and Results with the LPSC Charge Breeder

Experimental setupLight and heavy ions charge breeding

Booster ‘improvements’14 GHz results with the new configuration

18 GHz resultsPreliminary 14+18 GHz frequency mixing

Thierry Lamy, Julien Angot, Christian Fourel, Thomas Thuillier

Laboratoire de Physique Subatomique et de CosmologieCNRS-IN2P3/UJF/INP Grenoble

Experimental setup (1)New Configuration and Results with the LPSC Charge Breeder

H-V Emittancemeters

Allison type 1+ and n+ Emittancemeters

Example natural Kr1+ isotopesDelivered by the 2.45 GHz Monobob source

(GANIL-SPIRAL2)

New Configuration and Results with the LPSC Charge BreederExperimental setup (2)

New Configuration and Results with the LPSC Charge BreederExperimental setup (3)

New Configuration and Results with the LPSC Charge BreederExperimental setup (4)

1+ BeamFrom TIS

n+ Beamto acceleration

Well known ECRtechnologysimplicityCw or pulsedoperation

SIMION 3D Calculations

ECR Plasma capture andIonization

DecelerationOpticaladaptation

New Configuration and Results with the LPSC Charge BreederExperimental setup (5)

0,0

0,1

0,2

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0,5

0,6

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0,9

1,0

-60 -50 -40 -30 -20 -10 0 10 20 30

DV (volts)

Capturevs DV

Ar8+ Rb15+ Zn11+ Sn22+

The potential difference between the 1+ and the n+ sources permit the capture

New Configuration and Results with the LPSC Charge BreederLight and heavy ions charge breeding (1)

Thermoionization source

1+ beam line

17O3+, 34S6+, 68Zn12+,85Rb15+…17O3+, 34S6+, 68Zn12+…

85Rb15+ (+ O2 gas) 3.6 % 70 ms, (We had before, 5 %, 225 ms)

The tuning of the boostermay depend on the isotopehalf life

74Rb 64.9 ms82Rb 1.273 m

Rb1+ spectrumRubidium

87Rb1+85Rb1+

85Rb1+ X emittance

85Rb15+ X emittance

New Configuration and Results with the LPSC Charge BreederLight and heavy ions charge breeding (2)

10 eV

Na+

NaO+

Y

Y’

New Configuration and Results with the LPSC Charge BreederLight and heavy ions charge breeding (3)

Sodium beam

23Na6+ (+ He gas) 1.9 % 50 ms

14 GHz

200 W

300 W

400 W

500 W

600 W

New Configuration and Results with the LPSC Charge Breeder

V curves versus RF Power

Light and heavy ions charge breeding (4)

Na3+

Na6+

Na7+

Na8+

New Configuration and Results with the LPSC Charge BreederLight and heavy ions charge breeding (5)

Magnetic nose

Booster ‘improvements’New Configuration and Results with the LPSC Charge Breeder

EvacuationAdmission

New double frequency plasma chamberCooling between inner and outer cylinderIR camera: FLIR Thermacam E45

Plasma chamber fully cooled down in 25 ms

Cooling tests of the double frequency plasma chamber

New Configuration and Results with the LPSC Charge Breeder

Booster Body(grounded)

Central insulator, e = 3mm(2 parts) 60 kV: OK

1

2Extraction side

Insertion central insulator 1 Insertion central insulator 1Recouvrement (1et 2): 100 mm

After 10 yearsRemember: central core of the Booster (HT)To be inserted into the insulator

New Configuration and Results with the LPSC Charge BreederBooster ‘improvements’

New Configuration and Results with the LPSC Charge BreederBooster ‘improvements’

A slight demagnetization at theinjection 8 kG on the poles (nominal)

Champ magnétique radial sur les pôles de l'hexapôle du booster

0

1

23

45

6

78

9

0 5 10 15 20 25 30 35Injection Z (cm) Extraction

B(k

G) Pôle 1 0° (-)

Pôle 2 60° (+)Pôle 3 120° (-)

Pôle 4 180° (+)Pôle 5 240° (-)

Pôle 6 300° (+)

Hexapole insertionInto the centralinsulator

Plasma chamber insertionInto the hexapole

Hexapole magnetization check

Booster ‘improvements’New Configuration and Results with the LPSC Charge Breeder

Magnetic plug injection insertion

Booster ready to land !

Efficient and fast worker(Julien not contaminated)6 screws to tighten

Magnetic plug extraction insertion6 screws to tighten

Montage alumine extractionVue nez extraction Montage butée Permaglass

Vue support tube ralentisseurFixation alumine injection Fixation alumine extraction

Booster ‘improvements’New Configuration and Results with the LPSC Charge Breeder

New Configuration and Results with the LPSC Charge BreederPreliminary results

Booster opened many times (high drain current on power supply)

@14 GHz the Eff. Yield 85Rb13+after the modifications 2%

12 V

@ 18 GHz08/31/08

After 1 weekdrying

@18 GHz: Eff. Yield 85Rb13+ 1% (after 1 hour)

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1

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1.4

100 200 300 400 500 600 700

Puissance (W)

Ren

dem

ent

pou

rR

b13

+(%

)

14GHz18GHz50% 14GHz + 50% 18GHz25% 14GHz + 75% 18GHz10% 14GHz + 90% 18GHz

New Configuration and Results with the LPSC Charge Breeder

Initial conditions

1.3 % at best after 3 hours experiment‘slight’ effect of frequency mixingAt least no drama…!

CH1

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0

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1

-0.10 -0.05 0.00 0.05 0.10 0.15 0.20 0.25 0.30

12 eV

93 ms

Preliminary results