1. Technology Department 7 May 2015A.Adraktas1 MKD 3D field calculations A. Adraktas Acknowledgments: V. Senaj MKD meeting, 7 May 2015

2. Technology Department 7 May 2015A.Adraktas2 MKD 3D field calculations Based on the requirement to reduce the electrostatic field below 1.5 MV the design of the GTO stack was modified to achieve this goal Following the proposals of V.Senaj i also made a model to verify the results of these modifications

3. Technology Department 7 May 2015A.Adraktas3 MKD 3D field calculations 3D field calculations for the model with 20mm displacement of the ground busbar ( highest field of 1.47MV)

4. Technology Department 7 May 2015A.Adraktas4 MKD 3D field calculations 3D field calculations for the model with 20mm displacement of the ground busbar ( upper part field: 1.44MV)

5. Technology Department 2 April 2015A.Adraktas5 MKD 3D field calculations Conclusions The required goal of 1.5MV was achieved with these modifications Further optimization can be made for the thickness of araldite surrounding the ground busbar to reduce the field