Sample Problem: Cylindrical Halfraum at OMEGA

Setting Laser Beam Parameters

In this example, we set up the laser beams such that:

• 15 beams enter the halfraum, in 3 cones, with the pointing being different for each cone.
• 5 beams are used as backlighter beams, with all beams focused at the center of the backlighter.
• All beams have a power of 0.45 TW.

The clustering of the beams is given by:

To set the beam power for all beams:

• Select all of the beams. Right click on them, and select Set Powers.
• Set the constant power to 0.45 TW.

To set up Cone 2:

• Add a cluster named "Cone 2" by selecting Lasers | Add Cluster.
• While holding down the control key, select each of the beams to be added to Cone 2. Then right-click with the mouse, and select Move to Cluster | Cone 2.
• Right-click on Cone 2, and select Turn On. The beams now appear in the graphics frame.
• Right-click on Cone 2, and select Set Pointing :
  • For Reference Coordinate System, select "Halfraum_transparent_LEH_1" (this component represents one of four parts of a cylindrical halfraum).
  • For position, use r = (0, 0, 0) because this cone is pointed at the center of the LEH.
• Cone 2 is now set up.

To set up Cone 3a and Cone 3b, perform similar steps as for Cone 2 except:

• For position Cone 3a beams, use r = (0, 0, -0.02) because this cone is pointed at a point 0.02 cm inside the LEH.
• For position Cone 3b beams, use r = (0, 0, -0.01) because this cone is pointed at a point 0.01 cm inside the LEH.

To set up the backlighter beams, perform similar steps as for Cone 2 except:

• For Reference Coordinate System, select "Backlighter".

All laser beams are now set up.