Experimental Setup and FEL Interface

Will Williams and Zheng-Tian LuArgonne National Lab

2

Goal: Produce Metastable Krypton using optical fields

4p6 1S0

123.

5nm

5s[3/2]01

5p[3/2]2

819nm

5s[3/2]02

5p[5/2]3

811nm

Cycling

Review from this morning:1) Currently use an RF discharge source2) Poor efficiency3) Contamination problem4) Replace with optical source

3

Atomic Beam Line: Side View

Krypton in

26 inches

4

Capillary Plate(5mm thick; 50mm holes)

Atomic Beam Line: Side View

Krypton in

Atomic Beam travelling to the right

26 inches

5

Capillary Plate(5mm thick; 50mm holes)

819nm(retro-reflected)

FEL lightinto slide

4p6 1S0

123.

5nm

5s[3/2]01

5p[3/2]2

819nm

5s[3/2]02

5p[5/2]3

811nm

Cycling

Atomic Beam Line: Side View

Krypton in

Atomic Beam travelling to the right

26 inches

6

Capillary Plate(5mm thick; 50mm holes)

819nm(retro-reflected)

FEL lightinto slide

Atomic Beam Line: Side View

Krypton in

Atomic Beam travelling to the right

26 inches

7

Capillary Plate(5mm thick; 50mm holes)

819nm(retro-reflected)

FEL lightinto slide

250 L/sTurbo

RGA

Atomic Beam Line: Side View

Krypton in

Atomic Beam travelling to the right

26 inches

8

Capillary Plate(5mm thick; 50mm holes)

819nm(retro-reflected)

FEL lightinto slide

250 L/sTurbo

RGA

Photo-detector

Atomic Beam Line: Side View

811nminto slide

Krypton in

Atomic Beam travelling to the right

4p6 1S0

123.

5nm

5s[3/2]01

5p[3/2]2

819nm

5s[3/2]02

5p[5/2]3

811nm

Cycling

26 inches

9

Capillary Plate(5mm thick; 50mm holes)

819nm(retro-reflected)

FEL lightinto slide

250 L/sTurbo

RGA

811nminto slide

Photo-detector

Atomic Beam Line: Side View

Krypton in

Atomic Beam travelling to the right

26 inches

10

Krypton in

Capillary Plate(5mm thick; 50mm holes)

819nm(retro-reflected)

FEL lightinto 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

11

Atomic Beam coming out of slide

Atomic Beam Line: Looking down beam line toward the source

Capillary Plate(5mm thick; 50mm holes)

819nm(retro-reflected)

FEL light

FEL light

12

Atomic Beam Line: Looking down beam line toward the source

Capillary Plate(5mm thick; 50mm holes)

819nm(retro-reflected)

FEL light

Custom Flange

MgF Window

FEL light

Atomic Beam coming out of slide

13

Atomic Beam Line: Looking down beam line toward the source

Capillary Plate(5mm thick; 50mm holes)

819nm(retro-reflected)

FEL light

Gate Valve

Angle Valve

Custom Flange

MgF Window

FEL light

Atomic Beam coming out of slide

14

Atomic Beam Line: Looking down beam line toward the source

Capillary Plate(5mm thick; 50mm holes)

819nm(retro-reflected)

FEL light

Gate Valve

Angle Valve

Custom Flange

MgF Window

VUV detector

FEL light

Atomic Beam coming out of slide

819 nm laser setup

Lasers

811 nm laser setup

Lab Overview

Lab Overview

Beamline Table40 inches x 24 inches

18

1.24nm

Expectations

12FWHM

Bω

πLog(2)

2

Ac

Pr

19

γωh

cπ

FWHM/2λc

FWHM/2-λc

π2

πLog(2)

2

wπ21c

Pr

3

32

2

Expectations

1.24nm=31

2

g

MHz

(~2.5 fm)

20

Assumes a laser waist of 3.5mm

Expectations

=312g MHz(~2.5 fm)

1.24nm

)(3.0r 1 mWPowers

Expectations

Parameters

819 laser 100x saturation

FEL FWHM 1.24nm

FEL waist 3.5mm

tInteraction 28.5ms

Expectations

1 x 10-5

RF Discharge efficiency ~10-4

Parameters

819 laser 100x saturation

FEL FWHM 1.24nm

FEL waist 3.5mm

tInteraction 28.5ms

Expectations

Expected maximum efficiency 1 x 10-5

Expected maximum metastable flux 1 x 109 atoms/sec/cm2

Detectable flux (fluorescence) 1 x 108 atoms/sec/cm2

Detectable flux (lock-in) 1 x 107 atoms/sec/cm2

Detectable flux using a lock-in amplifier is about ~1% of our expected metastable flux.

End of Slideshow

25

Atomic Beam Line

26

Laser

To Exp.

2 fe

et

2 feet

T.A.

819 nm laser setup

Lasers

Lasers

811 nm laser setup

Laser

To Exp.

1.5

feet

2 feet