Abstract
High pressure gas is allowed to expand freely into the vacuum, where a supersonic beam is formed. After a critical distance the beam is caught again in an appropriately cone-shaped tube, which offers the following advantages: the beam acts as a pump for the open region betweenn the nozzle and the cone due to momentum transfer to the surrounding gas particles; a back pressure of more than one atmosphere can be tolerated because of the high momentum of the beam. These properties allow the construction of a high density windowless gas target with a considerable reduction of the gas load. A density between 1020 and 1021 particle/cm3 was reached in a 2 mm diameter nitrogen beam.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
