Versions Compared

Version Old Version 3 New Version Current
Changes made by

BARUE Christophe

BARUE Christophe

Saved on

Key

  • This line was added.
  • This line was removed.
  • Formatting was changed.


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

Image Modified

LCO

HT

- 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
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%.

...