Turn on hardware
- Set hutch to “Class 1”, or “Class 4 Glass Laser”, or “Class 4 Dual Laser”, or “Class 4 Split Mode
- At the LSS display, badge in and open Shutter S4, and press the “Press to reset interlocks"
Turn on four TDK Lambda power supplies. Power switch to “1” .Press the tiny “out” button at each of the 4 supplies.
- Turn on six eDrives: keys and power buttons
Turn on four chillers
- Switch on NP Photonics Seed Laser: toggle the “pump” switch from position 0 to 1. You will see PWR ramp up to around 140mW.
Turn on YFE
Do the following on the terminal:
- ssh mec-laser
- mecpython
- import meclas
- meclas.YFE.On()
Load the waveform recipe and shape the waveform
- meclas.LPL.psmenu(): this command gives you a list of recipes to choose from
- Type in the recipe from the menu list, for example, l56 == "U10ns00gradE100J"
- meclas.LPL.psefc10Hz(numIterQ=150): run this command you will shape the 10Hz pulse as designed. It's a feedback loop and numIterQ = x tells it to run x times of iteration. The lower left figure shows all the parameters you can set. The lower right figure shows the 10Hz pulse (blue) and designed shape (red). For more detail please check how to make a new recipe.
Open the beam monitor cameras
There are 6 cameras in the upgraded LPL layout: the new camview can be opened in mechome [detectors>view-long pulse Laser Cams> dropdown (figure below 1)]. For camview detail please check New LPL Camview
The full alignment using these 6 cameras is recommended. For operation and monitoring purposes LPL_100J_1, LPL_100J_3, LPL_100J_4, are needed to open. These imagers locations and descriptions are as followed (figure below 2).
- 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)
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