...

• LPL_100J_2: the imager looking behind the 1" amplifier and before the relay tube 
• LPL_100J_1: the imager looking behind the big Faraday Rotator
• LPL_100J_5: the imager looking before the east side 2" heads (IJ, and GH input)
• LPL_100J_6: the imager looking before the west side 2" head (AB and EF input)
• LPL_100J_3: the imager looking at combined east 527nm (IJ+GH output)
• LPL_100J_4: the imager looking at combined west 527nm (AB+EF output)

Figure 7. Open Long Pulse Laser Camview

Image Modified

Figure 8. Long pulse laser cameras and irises layout

Check alignment

• align 10Hz pulse through the pinhole (visual check: should not see scatter light or adjust the pinhole position)
• check i1 and i2: if it's very off, adjust with M3 and M4  (use LPL_100J_1 or IR card)
• check i3: beam should be in the center of i3 (use LPL_100J_1 or IR card)
• check i4: close i3 to create ring pattern (use LPL_100J_1 or IR card) adjust with the mirror befoer i3.
• check i5 and i6: (use LPL_100J_5 and LPL_100J_6) adjust with M8 and M9
• check i7, i8 and  i9, i10 (use LPL_100J_3) adjust with M2, M22 and BS3
• check i11, i12 and i13, i14 (use LPL_100J_4) adjust with M10, M13 and M18
• check i15, i16 (use card) first close i3 half way, block GH, adjust LWP15 and M26. Then open GH, block IJ, adjust with LWP10 and LWP12
• check i17, i18 (use card) first close i3 half way, block EF, adjust LWP2 and M15. Then open EF, block AB adjust with LWP6 and LWP8

...

• check if all TTL shutter are all working. If not, open all TTL shutter and run the command " meclas.TTL_shutter.Refresh() "
• command " meclas.TTL_shutter.Status() " will show the their status: in = 1, out = 0.
• command " meclas.LPL.SHG_opt() " will run four SHG crystal rotation stages and find the maximum one by one. You can only run one arm by meclas.SHG_opt(armsQ='XX')

Figure 9: SHG optimization

Optimize HWP

Run " meclas.HWP.HWP_opt()". You can alsorun one or two arms by " meclas.HWP.HWP_opt(armsQ='ABIJ)".

...

• Make sure the final shutter, T3a and T3b, are closed. If it is open, make sure things are properly blocked inside the target chamber.
• check event sequence configuration: play status "stopped" in case the lamps got misfired.
• change camera trigger to "single shot": in MEC Home> EVR > New MEC LAS EVR > Front Panel B change to 182 (single shot) from 43 (10Hz)
• change Ns Slicer and Lamps to single shot: Long pulse laser operation> click Single buttons on NsSlicer and Lamps
• Charge: MEC:PFN> click "stop", "Stand By", "Ready" and "Charge"
• Fire: click "single shot"
• run postshot: "meclas.LPL.pspostshot(save_flag = True, display = True)" it shows a plot and energy output.
• or show energy meter: "meclas.EMeters.Gall()"

Figure 10. left: Event Code Sequence, Middle: new MEC LAS EVR, the camera trigger is at cha 11 (Front Panel B), right: Long pulse laser operation and MEC:PFN

Figure 11. upper left: 10Hz YFE pulse shape (blue) and designed pulse shape (red). upper right: combined 100J shape. left: camview "LPL_100J_3" and "LPL_100J_4" showing single beam profiles, right: run "LPL.pspostshot()".