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GDVN nozzles as used at the LCLS, the arrow indicates the flow direction. (a) Nozzle is mounted in a stainless steel nozzle holder, which allows adjustment of the position of the inner capillary relative to the gas-focusing aperture. These nozzles can be disassembled and repaired if clogging occurs. (b) Glued nozzle, the inner capillary is glued into the outer tube. No repair or adjustment is possible. The length of the nozzle is about 5 cm.
