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Ion / Production method

208Pb28+ / Oven LCO

Compound used

208Pb (enriched > 90%)

vapor pressure ~ 10-4 Torr at

900°C

550°C

 

Aspect

Chemical sensitivity

White powder

Silver aspect, stable

?

Image Removed

Image Added

LCO

HT Oven

- Ta Outlet diam. 2 mm

 

 

Ion source parameters

ECR4M-14GHz

RF power :

140

380 W

Mixing gaz : O2

Oven power : 3.5 W (~250°C off line)

Oven position :

0

+6 mm

Source voltage : 18kV/1.8mA

Intensity : 4.

1

5 µA (

92

208Mo

16

28+)

For <I28+> =1.4 µA during 17 days :

Consumption : 0.1

.3

mg/h

Total ionization efficiency : 

1.0%

13%

Comments
Low ionization efficiency

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).

 Image Added

Spectrum obtained with ECR4M and optimized on 92Mo16 208Pb28+ (4.1 5 μA). RF power: 140 380 W (37 120 W reflected), 18 kV/1.8 mA, buffer gas O2O2: 8.5E-6 mbar at injection, 2E-7 mbar at extraction, oven power 31.5 9 W (~250°C ~200°C off line), oven position: 0 +6 mm inside the plasma chamber, no bias, coils: 940A/730A. Transport efficiency up to the faraday cup: ~40%.

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