How to design a helical TWT in CST MWS?

How to design a helical TWT in CST MWS ?

Hello

I would be very pleased if anyone give/sent me file designed a helical TWT in CST MWS .
input impedance of 50 Ohms , 2.45GHz (ISM Band), Gain and Bandwidth are flexible.

Please Help. I am a beginner.

my E-mail: msph2078@yahoo.com