Ion-induced desorption (continued)

Icrit ? 1.8 A / ? > 2 * 2 * 0.85 A

but ? = ...?

depends on materials used,

surface coverage, ion energy spectrum, ...

time- and history-dependent

Calculations ongoing (A. Rossi, LHC/VAC).

Possible remedies:

• pre-treatment by baking, chemical cleaning, or glow discharge ?

• use of coatings ? (what about RF ?)

• possible beam cleaning (with detector open) ?

• ... ?

!

Two beams

safety factor

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