AVS 45th International Symposium
    Vacuum Technology Division Tuesday Sessions

Session VT-TuM
Molecular Drag Pumping

Tuesday, November 3, 1998, 8:20 am, Room 329
Moderator: J.C. Helmer, AVS Fellow


  Click here to Download program book for this session  
  in Adobe Acrobat format  

Click a paper to see the details. Presenters are shown in bold type.

8:20am VT-TuM1
Performance of Molecular Drag Pumping Stages in Hybrid Turbopumps
M.H. Hablanian, Varian Associates
8:40am VT-TuM2
Turbodrag Pump Technologies
O. Ganschow, Schorch GmbH, Germany
9:00am VT-TuM3
Pumping Mechanism of Helical Grooved Molecular Drag Pumps
T. Sawada, W. Sugiyama, Akita University, Japan
9:20am VT-TuM4
Measurements Illustrating the Importance of Desorption and Molecular Residence Times on the Molecular Drag Process
A.D. Chew, R.A. Abreu, I. Creaye, BOC Edwards, United Kingdom
9:40am VT-TuM5
Improved Design of a Multi-Groove Vacuum Pump Compressing Directly to the Air
E.S. Valamontes, S.E. Valamontes, C.N. Panos, Technological and Educational Institute of Athens, Greece
10:00am VT-TuM6
Matching of Turbine Stages to a Drag Stage under Viscous Flow Conditions
Ch. Beyer, H. Englaender, P.J. Klingner, Leybold Vacuum GmbH, Germany
10:20am VT-TuM7
Flow Investigation of Siegbahn Pump by CFD Methodology
H.-P. Cheng, Precision Instrument & Development Center, Tawain. Read by J. Helmer, with historical figures by L. Westerberg.
10:40am VT-TuM8
Performance of a Peripheral Drag Pump
T. Ohbayashi, Osaka Vacuum, Ltd., Japan, T. Sawada, Akita University, Japan
11:00am VT-TuM9
Development of New Generation Turbo Molecular Pump
Y. Maejima, C. Urano, Seiko Seiki, Japan
11:20am VT-TuM10
Power Dissipation in Turbomoleculars Pumps at High Pressure
R. Cerruti, M. Spagnol, J.C. Helmer, Varian VPT, Italy