DG2: DiaGnostics stand 2

Slits 4 

• Slits 4 = DG2 Jaws
• Cut the beam down after the refocusing lenses or clean the beam after the 1 micron KB mirrors

X-ray Focusing Lenses

• Change the divergence of the 1 micron KB beam and control the spot size in SC1
• PACK2
  • Smaller focus for running experiment (X-ray probe)
  • 20-30 um at IP
• PACK3
  • Bigger focus for IP or TT timing (X-ray pump)
  • 200-300 um
• OUT position: Y = -8 mm

NOTE: every time we change the focusing configuration, we need to record the change and sign in the CXI logbook hard copy. 

Intensity-Position Monitor (IPM)

• Non-destructive relative measurement of the pulse intensity using Wave8
• It can measure both the intensity and position, however, the position measurement is complex and we generally only use it as intensity monitor, and use it as X-ray pulse energy normalization in many diagnostics (X-ray I0)
• In DAQ, it is the detector: CXI-DG2-BMONN
• The following is a Wave8 diode channel mapping at XPP as an example:

Profile-Intensity Monitor (PIM)

• Measure the beam profile on the way to the 1 micron focus, after the 100 nm focus or after the refocusing DG2 lenses
• CXI DG2 YAG
• With the prefocus lens, we have ~200 um on DG2 YAG
• With the prefocus lens and the DG2 lens, they together make the focus ~20-30 um at IP
• IOC camera: cxi_dg2_yag