Lead at GANIL

Owned by BARUE Christophe
Last updated: Mar 18, 2019


Ion / Production method

208Pb28+ / Oven LCO

Compound used

208Pb (enriched > 90%)

vapor pressure ~ 10-4 Torr at 550°C

 

Aspect

Chemical sensitivity

Silver aspect, stable

LCO - Ta Outlet diam. 2 mm

 

 

Ion source parameters

ECR4M-14GHz

RF power : 380 W

Mixing gaz : O2

Oven power : 3.5 W (~250°C off line)

Oven position : +6 mm

Source voltage : 18kV/1.8mA

Intensity : 4.5 µA (208Mo28+)

For <I28+> =1.4 µA during 17 days :

Consumption : 0.1 mg/h

Total ionization efficiency :  13%

Comments

Becomes liquid before evaporation. The plasma must be established very slowly

to avoid over-evaporation. The ionization efficiency is good.

More details can be found in this publication : " Status Report on Metallic Beam Production at GANIL/SPIRAL 2 ", 22th ECRIS (Busan 2016).

Spectrum obtained with ECR4M and optimized on 208Pb28+ (4.5 μA). RF power: 380 W (120 W reflected), 18 kV/1.8 mA, buffer gas O2: 8.5E-6 mbar at injection, 2E-7 mbar at extraction, oven power 1.9 W (~200°C off line), oven position: +6 mm inside the plasma chamber, no bias, coils: 940A/730A. Transport efficiency up to the faraday cup: ~40%.

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