scholarly journals A Note on End Effects in Electron Drift Tube Experiments

1973 ◽  
Vol 26 (5) ◽  
pp. 685
Author(s):  
MT Elford ◽  
AG Robertson
Keyword(s):  
Drift Velocity ◽  
Drift Tube ◽  
Time Of Flight ◽  
Drift Chamber ◽  
Electron Drift Velocity ◽  
Electron Drift ◽  
Velocity Measurements ◽  
End Effects ◽  
Time Of Flight Method

Experiments to test the influence of end effects on electron drift velocity measurements by the Bradbury-Nielsen time-of-flight method are described. A comparison of data taken at drift distances of 5, 10, and 50 cm in hydrogen and 5 and 10 cm in helium shows that over the EIN and pressure ranges investigated the results are independent of drift distance and that it is justifiable to consider this distance as that between the mid planes of the grids which terminate the drift chamber.

scholarly journals The Drift Velocity of Electrons in Oxygen at 293 K

1973 ◽  
Vol 26 (6) ◽  
pp. 771 ◽  
Author(s):  
RW Crompton ◽  
MT Elford
Keyword(s):  
Drift Velocity ◽  
Drift Tube ◽  
Time Of Flight ◽  
Velocity Measurements ◽  
Time Of Flight Method ◽  
Good Agreement

The drift velocity of electrons in oxygen at 293 K has been measured over the range 0.8 ≤ E/N ≤ 12 Td by the Bradbury–Nielsen time-of-flight method. The factors governing the range over which measurements can be made are discussed and it is shown that long drift tubes should be used for drift velocity measurements in oxygen at low values of E/N. A 50 cm drift tube is described. The error in the present results is estimated to be less than 1 % for 1.8 E/N E/N > 6 Td and at 1.5 Td, 5 % at 1 Td, and 10 % at 0.8 Td. The present data are in good agreement with those of Fleming et al. (1972) and Nelson and Davis (1972) over the E/N range where the sets of data overlap.

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