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Experimental Setup and FEL Interface Will Williams and Zheng-Tian Lu Argonne National Lab
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2 Goal: Produce Metastable Krypton using optical fields 4p 6 1 S 0 123.5nm 5s[3/2] 0 1 5p[3/2] 2 819nm 5s[3/2] 0 2 5p[5/2] 3 811nm Cycling Review from this morning: 1)Currently use an RF discharge source 2)Poor efficiency 3)Contamination problem 4)Replace with optical source
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3 Atomic Beam Line: Side View Krypton in 26 inches
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4 Capillary Plate (5mm thick; 50 m holes) Atomic Beam Line: Side View Krypton in Atomic Beam travelling to the right 26 inches
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5 Capillary Plate (5mm thick; 50 m holes) 819nm (retro-reflected) FEL light into slide 4p 6 1 S 0 123.5nm 5s[3/2] 0 1 5p[3/2] 2 819nm 5s[3/2] 0 2 5p[5/2] 3 811nm Cycling Atomic Beam Line: Side View Krypton in Atomic Beam travelling to the right 26 inches
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6 Capillary Plate (5mm thick; 50 m holes) 819nm (retro-reflected) FEL light into slide Atomic Beam Line: Side View Krypton in Atomic Beam travelling to the right 26 inches
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7 Capillary Plate (5mm thick; 50 m holes) 819nm (retro-reflected) FEL light into slide 250 L/s Turbo RGA Atomic Beam Line: Side View Krypton in Atomic Beam travelling to the right 26 inches
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8 Capillary Plate (5mm thick; 50 m holes) 819nm (retro-reflected) FEL light into slide 250 L/s Turbo RGA Photo- detector Atomic Beam Line: Side View 811nm into slide Krypton in Atomic Beam travelling to the right 4p 6 1 S 0 123.5nm 5s[3/2] 0 1 5p[3/2] 2 819nm 5s[3/2] 0 2 5p[5/2] 3 811nm Cycling 26 inches
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9 Capillary Plate (5mm thick; 50 m holes) 819nm (retro-reflected) FEL light into slide 250 L/s Turbo RGA 811nm into slide Photo- detector Atomic Beam Line: Side View Krypton in Atomic Beam travelling to the right 26 inches
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10 Krypton in Capillary Plate (5mm thick; 50 m holes) 819nm (retro-reflected) FEL light into slide Atomic Beam travelling to the right -> Atomic Beam coming out of slide Atomic Beam Line: Side View -> Looking down beam line toward the source
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11 Atomic Beam coming out of slide Atomic Beam Line: Looking down beam line toward the source Capillary Plate (5mm thick; 50 m holes) 819nm (retro-reflected) FEL light
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12 Atomic Beam Line: Looking down beam line toward the source Capillary Plate (5mm thick; 50 m holes) 819nm (retro-reflected) FEL light Custom Flange MgF Window FEL light Atomic Beam coming out of slide
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13 Atomic Beam Line: Looking down beam line toward the source Capillary Plate (5mm thick; 50 m holes) 819nm (retro-reflected) FEL light Gate Valve Angle Valve Custom Flange MgF Window FEL light Atomic Beam coming out of slide
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14 Atomic Beam Line: Looking down beam line toward the source Capillary Plate (5mm thick; 50 m holes) 819nm (retro-reflected) FEL light Gate Valve Angle Valve Custom Flange MgF Window VUV detector FEL light Atomic Beam coming out of slide
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819 nm laser setup Lasers 811 nm laser setup
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Lab Overview
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Beamline Table 40 inches x 24 inches
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18 1.24nm Expectations
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19 Expectations 1.24nm MHz (~2.5 fm)
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20 Assumes a laser waist of 3.5mm Expectations MHz (~2.5 fm) 1.24nm
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Expectations Parameters 819 laser100x saturation FEL FWHM1.24nm FEL waist3.5mm t Interaction 28.5 s
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Expectations 1 x 10 -5 RF Discharge efficiency ~10 -4 Parameters 819 laser100x saturation FEL FWHM1.24nm FEL waist3.5mm t Interaction 28.5 s
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Expectations Expected maximum efficiency1 x 10 -5 Expected maximum metastable flux1 x 10 9 atoms/sec/cm 2 Detectable flux (fluorescence)1 x 10 8 atoms/sec/cm 2 Detectable flux (lock-in)1 x 10 7 atoms/sec/cm 2 Detectable flux using a lock-in amplifier is about ~1% of our expected metastable flux.
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End of Slideshow
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25 Atomic Beam Line
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Laser To Exp. 2 feet T.A. 819 nm laser setup Lasers
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811 nm laser setup Laser To Exp. 1.5 feet 2 feet
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