1. Cut inflector electrodes for 14N5+ ion
15 November 2008
Cut inflector electrodes for 14N5+ ion
E.E. Perepelkin and S.B. Vorozhtsov
JINR, Dubna

2. Inflector parameters Charge particle Z = 5 Mass particle A = 14
Injection energy Wk= 52 keV
Electric radius = 26 mm
Gap = 8 mm
Electrode voltage Uinf = ±3.2 kV
No tilt
Magnetic field Bc = T
This data was obtained from Goto-san’s inflector central trajectory

3. Cut is 0 mm
Theory
Z=70mm, Uinf=3.2kV, Bc=1.483T
Z=26mm, Uinf=3.2kV, Bc=1.483T
Z=70mm, Uinf=3.0kV, Bc=1.483T
Z=70mm, Uinf=3.2kV, Bc=1.503T
Z=70mm, Uinf=3.0kV, Bc=1.503T
This coordinate system rotated at the angle - 39° from the AVF cyclotron coordinate system

4. Cut is 0 mm. 3D view
Theory
Z=70mm, Uinf=3.2kV, Bc=1.483T
Z=26mm, Uinf=3.2kV, Bc=1.483T
Z=70mm, Uinf=3.0kV, Bc=1.483T
Z=70mm, Uinf=3.2kV, Bc=1.503T
Z=70mm, Uinf=3.0kV, Bc=1.503T
This coordinate system rotated at the angle - 39° from the AVF cyclotron coordinate system

5. Cut is 2 mm
Theory
Z=70mm, Uinf=3.2kV, Bc=1.483T
Z=70mm, Uinf=3.3kV, Bc=1.483T
Z=70mm, Uinf=3.2kV, Bc=1.503T
Z=70mm, Uinf=3.3kV, Bc=1.503T
This coordinate system rotated at the angle - 39° from the AVF cyclotron coordinate system

6. Cut is 2 mm. 3D view Theory Z=70mm, Uinf=3.2kV, Bc=1.483T

7. Cut is 4 mm
Theory
Z=70mm, Uinf=3.2kV, Bc=1.483T
Z=70mm, Uinf=3.6kV, Bc=1.483T
Z=70mm, Uinf=3.2kV, Bc=1.503T
Z=70mm, Uinf=3.6kV, Bc=1.503T
This coordinate system rotated at the angle - 39° from the AVF cyclotron coordinate system

8. Cut is 4 mm. 3D view
Theory
Z=70mm, Uinf=3.2kV, Bc=1.483T
Z=70mm, Uinf=3.6kV, Bc=1.483T
Z=70mm, Uinf=3.2kV, Bc=1.503T
Z=70mm, Uinf=3.6kV, Bc=1.503T
This coordinate system rotated at the angle - 39° from the AVF cyclotron coordinate system

9. Conclusions
It’s very important to know the inflector central trajectory parameters that the real inflector exactly fit to.
Inflector geometry with 2 mm cutting is better than with 4 mm.
Original inflector geometry ( no cutting ) will do also by adjusting the voltage.
For the multi-particle inflector the optimal cutting requires additional investigation.