KIT | KIT-Bibliothek | Impressum | Datenschutz
Open Access Logo
DOI: 10.5445/IR/1000089096
Veröffentlicht am 11.01.2019
DOI: 10.1016/j.vacuum.2018.11.049

Improved model for transmission probabilities of edge-welded bellows based on TPMC simulations

Krause, M.; Wolf, J.

Many complex vacuum systems include edge-welded bellows. Their simulation in the molecular flow regime with a Test Particle Monte Carlo (TPMC) code, such as MolFlow+, can take considerable amounts of computing power and time. Therefore we investigated the change of the transmission probability of a bellow compared to a cylindrical tube in TPMC simulations. The results were used to develop an empirical model to simplify the geometry of a bellow in a TPMC model by replacing it with a cylindrical tube of extended length, consequently compensating the reduced conductance of the bellow. The simulated transmission probabilities of a variety of different bellow lengths have been used to fit the parameters of the model. Each bellow geometry simulated with MolFlow + comprised two cylindrical tubes, one at each end, and the central bellow section. The geometry of each bellow is described by two quantities. The first one is the total length of the geometry model normalized to the inner diameter of the bellow. The second one is the fraction of the bellow section with regard to the total length. Simulating a tube instead of a long bellow reduced ... mehr

Zugehörige Institution(en) am KIT Institut für Theoretische Physik (ITP)
Institut für Experimentelle Teilchenphysik (ETP)
Publikationstyp Zeitschriftenaufsatz
Jahr 2019
Sprache Englisch
Identifikator ISSN: 0042-207X, 1879-2715
URN: urn:nbn:de:swb:90-890960
KITopen-ID: 1000089096
Erschienen in Vacuum
Band 160
Seiten 402-409
Schlagworte Edge-welded bellow, Transmission probability, Improved model, TPMC simulation
Nachgewiesen in Scopus
KIT – Die Forschungsuniversität in der Helmholtz-Gemeinschaft KITopen Landing Page