Femtosecond timing at CXI

Step-by-step guide

Femtosecond timing in sample chamber 1 (SC1) at CXI.

1. Install a fast diode and mirror (roughly at 45 degrees with respect to the beam) on the SC1 sample_x stage
2. Roughly align the fast diode and mirror using the reference laser at the time tool (-4 mm in position but this will soon be changed to 0 mm.   If the "out" position is 92 mm, then -4 mm, if 96 mm, then 0 mm).
3. Insert a nozzle rod with both a clear YAG and a frosted YAG. 
   1. At CXI, the clear YAGs are typically thinner, around 20 um, whereas the frosted YAGs are thicker, around 50 um

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