Theoretical analysis of space‐charge effects in photochron streak cameras

1981 ◽  
Vol 52 (12) ◽  
pp. 1830-1836 ◽  
Author(s):  
H. Niu ◽  
W. Sibbett
Electronics ◽  
2020 ◽  
Vol 9 (10) ◽  
pp. 1587
Author(s):  
Dun Lu ◽  
Wenjie Fu ◽  
Xiaotong Guan ◽  
Tongbin Yang ◽  
Chaoyang Zhang ◽  
...  

Low-voltage compact gyrotron is under development at the University of Electronic Science and Technology of China (UESTC) for industrial applications. Due to the low operating voltage, the relativistic factor is weak, and interaction efficiency could not be high. Therefore, a magnetron-injection gun (MIG) with an extremely high-velocity ratio α (around 2.5) is selected to improve the interaction efficiency. As beam voltage drops, space charge effects become more and more obvious, thus a more detailed analysis of velocity-ratio α is significant to perform low-voltage gyrotrons, including beam voltage, beam current, modulating voltage, depression voltage, cathode magnetic field, and magnetic depression ratio. Theoretical analysis and simulation optimization are adopted to demonstrate the feasibility of an ultra-high velocity ratio, which considers the space charge effects. Based on theoretical analysis, an electron gun with a transverse to longitudinal velocity ratio 2.55 and velocity spread 9.3% is designed through simulation optimization. The working voltage and current are 10 kV and 0.46 A with cathode emission density 1 A/cm2 for a 75 GHz hundreds of watts’ output power gyrotron.


Instruments ◽  
2021 ◽  
Vol 5 (1) ◽  
pp. 9
Author(s):  
Sandro Palestini

The subject of space charge in ionization detectors is reviewed, showing how the observations and the formalism used to describe the effects have evolved, starting with applications to calorimeters and reaching recent, large time-projection chambers. General scaling laws, and different ways to present and model the effects are presented. The relations between space-charge effects and the boundary conditions imposed on the side faces of the detector are discussed, together with a design solution that mitigates some of the effects. The implications of the relative size of drift length and transverse detector size are illustrated. Calibration methods are briefly discussed.


Author(s):  
S. Machida ◽  
C. Prior ◽  
S. Gilardoni ◽  
M. Giovannozzi ◽  
A. Huschauer ◽  
...  

Author(s):  
Giuliano Franchetti ◽  
Simone Gilardoni ◽  
Alexander Huschauer ◽  
Frank Schmidt ◽  
Raymond Wasef

2021 ◽  
Vol 15 (1) ◽  
Author(s):  
Anna Sitek ◽  
Kristinn Torfason ◽  
Andrei Manolescu ◽  
Ágúst Valfells

1995 ◽  
Vol 2 (10) ◽  
pp. 3569-3572 ◽  
Author(s):  
K. Avinash ◽  
A. K. Agarwal ◽  
M. R. Jana ◽  
A. Sen ◽  
P. K. Kaw

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