Optimization of the LCLS Single Pulse Shutter

Research Advisor: Dr. FRITZ

Participant: Solomon Adera

What is a Pulse Picker?separates a single pulse.

reduces the repetition rate of the LCLS pulse train from 120 Hz (source) to 0 – 10 Hz.

should be aligned with high precision with the incoming beam.

Static aperture

Dynamic aperture

Exposure time

Opening delay

Inclination

Typical displacement vs. time plot

120 Hz X-ray source

The purpose of this project isdynamic aperture to ~ 4 mm open/close window time ~ 12 ms

Inclination (deg) Aperture (mm)

Exposure Time (ms)

Static Dynamic

6.7 3.1 1.5 7.3

8.4 3.8 2.4 6.7

10.2 4.6 3.3 6.4

11.3 5.1 2.4 5.8

11.9 5.5 3.0 3.8

12.7 5.8 3.0 3.8

0

1

2

3

4

5

6

7

6 8 10 12 14

Inclination (deg)

Ap

ertu

re (

mm

)

Static

Dynamic

0

1

2

3

4

5

6

7

8

6 7 8 9 10 11 12 13 14

Inclination (deg)

Exp

osur

e Ti

me

(ms)

Shutter Frequency (Hz) Exposure Time (ms) Dynamic Aperture (mm)

1 3.8 3.0

3 4.0 2.7

5 4.0 2.7

7 4.0 2.9

9 4.0 2.9

10 4.0 2.6

0.0

1.0

2.0

3.0

4.0

5.0

6.0

0 2 4 6 8 10

Frequency (Hz)

Exp

osu

re t

ime

(ms)

0.0

1.0

2.0

3.0

4.0

5.0

0 2 4 6 8 10 12

Frequency (Hz)

Dyn

amic

ap

ertu

re (

mm

)

Does freq. affect to and aperture?

LCLS’s desired result

Effect of increasing aperture

Solution 1:use stronger magnet.

Solution 2:Increasing input voltage duration

Solution 3:employing a damping element

Acknowledgement

• DOE

• SLAC/SULI

• Office of Science

• My mentor David Fritz.

• Also Eliazar Ortiz and Marc Campell

• Steve Rock

Questions???