This procedure is written for the LPL operation after the 100J upgrade. The LPL upgrade changed the beam size and relay imaging after the 1" CD amplifier. The upgraded setup employed new irises and new camera imagers for alignment checks with higher precision. The new procedure includes the hardware turn-on, the software turn-on, a new alignment routine (using imagers and irises), commands for SHG and HWP optimization, and recipes for new pulse shapes. 

TO DO

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• add a capability to put by default 'dither' to Yes
• press Y after the dither step again
• Add detailed/"expert" alignment steps as a link
• press Y until happy with the shape
• after SHG optimization, if you want to check Scope B enable 10 Hz on nsSlicer

Brief overview of LSS panel

Image Added

Figure 0: Shutter S4 releases the output of the YFE. Transport shutter T3 is to allow the LPL into the chamber and T4 is to allow the Visar into the chamber. (Red: open, Green: closed)

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 chillers

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If there are some visible sign of clipping in the pinhole and/or irregular profile when observing beam on orange paper, then make adjustments in both axis of the VSF pinhole to minimize the clipping/flaring of the beam. This adjustment, in turn, should improve the spatial profile of the beam when observed at 10Hz YFE only on the orange paper when the paper is placed just after the final telescope before the beam reflects up from large periscope. Adjustments to the pinhole will have pretty significant affects on the spatial profile delivered to the amplifiers but there are not any conditions on the alignment or mis-alignment of this pinhole that can result in damage to the amplifiers. 

As an alternative to using the orange paper as the indication on good beam quality through the pinhole, the Cam 3 and Cam 4 can be used. To do this, the large roll up doors will need to be opened so that the Nd filters in front of these cameras can be temporarily removed. This procedure and additional steps necessary for a more detailed alignment of the YFE beam through the amplifier heads can be found in this link:

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Load the waveform recipe and shape the waveform

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