Hi, you can try to increase the thermal bath of the bubbler and to heat the pipe line using for example wire heaters to apply along and around them. Usually that works.

What I recommend to keep the temperature of the lines at least 10 °C upper than thermal bath temperature.

Regards

#Giovanni Abagnale: Thank you for you reply. The problem is more complicated with Cp2Mg solid source. without carrier gas, increasing the bubbler temperature immediatly CP2Mg condensates on the its valve even a gradient of temperature is used across the line and takes two weeks to clear it. In addition, the continous change of the emission surface makes the supplied pressure unstable.