General Overview of Nozzles Sebastian Szustkowski 02/22/18 - PowerPoint PPT Presentation

Dec 05, 2023 •273 likes •346 views

General Overview of Nozzles Sebastian Szustkowski 02/22/18 Capillary Vs Nozzle Generally sonic nozzle have higher molecular intensity Sonic nozzle has a significantly narrow velocity distribution Both capillary and sonic nozzle can

General Overview of Nozzles Sebastian Szustkowski 02/22/18
Capillary Vs Nozzle • Generally sonic nozzle have higher molecular intensity • Sonic nozzle has a significantly narrow velocity distribution • Both capillary and sonic nozzle can have the same angular distribution – Capillary depends on its length and diameter – Sonic Nozzle depends its diameter and the distance from a skimmer Gas dynamics exiting capillary is molecular flow, while exiting a sonic nozzle is compressible flow
Sonic Nozzle For sonic nozzle, in literature main characteristics is the Mach number (M=u/a). Where u is the flow rate and a=sqrt(1.4*RT) is the speed of sound Atomic Density exiting nozzle is proportional to the Mach Number For maximum density circular skimmer would have to be in the the centerline of flow and in the Zone of silence Mach G. Scoles, Atomic and Molecular Beam Methods
Nozzle Experimental Data Mach number vs ratio of distance Beam intensity as a function of Mach number for maximum between nozzle and skimmer to source pressure beam intensities for given source nozzle inlet diameter pressure L. Valyi, Atom and Ion Sources
Nozzle-Skimmer Distance Nozzle Diameter 3.88um Skimmer Inner Diameter: 200um M Barr et al 2012 Meas. Sci. Technol. 23 105901
Discussion • Time evolution of the system • Different Nozzles will have different distribution • Due to nozzle higher intensity, multiple chamber stages required • MolFlow doesn’t account for compressible flow

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