How to define the height of the secondary concentrator in Soltrace

[yx526]

Dear managers:
I would like to add a secondary reflector to the upper part of the heat absorber based on the Trough system, but I find no way to define the length of the secondary reflector. Even the secondary mirror intersects with the trough concentrator. Other than that I wonder how I can run the LK script with cmd calling SOLTRACE, I follow the prompt on GITHUB and Fail to open file '-s' appears.
Hope to be able to get some advice!!!!
Best wishes!