AREAL

Laser overview

Advanced Research Electron Accelerator Laboratory

Aghasi Lorsabyan

Content

• Introduction• Photocathode and laser beam requirements• Possible layout• How to choose?• Current choice• TODO• Time schedule

Introduction

Photocathode and laser beam requirements

Parameter Single bunch Multi bunch

Laser wavelength (nm) 253-266 253-266Pump Repetition rate (including relaxation time ) 1 Hz 81 MHz (harmonic of 3GHz)

Shot Repetition Rate (Hz) 1 1Beam diameter (mm) < 5 < 5Beam Divergence ( % ) 0.1% 0.1%Pulse duration z (ps)

5-10 5-10

Pulse profile transv. / long. Gaussian / uniform (or Gaussian) Gaussian / uniform (or Gaussian)Laser energy per shot (µJ) 80-100 300-400Energy per pulse (µJ) 80-100 > 5Energy stability (long term) ( %) ± 1 ± 1Pulse-to-pulse jitter (fs) <100 <100Laser power ( W) < 3 up to 500

We will use copper photocathode. According to AREAL specifications we have following requirements for laser beam.

Possible Layout

THGPump wave (800 nm) 266nm

SHGPump wave (1064 nm) SHG 266nm

Pump wave (266 nm) 266nm

Scheme is highly depends of laser type

Third Harmonic Generation equipment

Photocathode

Laser

Optical Table

Beam Transportation

How to choose?

Pulse duration

Repetition rate

PricePower

Wavelength

Minimum requirements

Low price UV beam or UV harmonic 1-10 ps pulse duration <100 fs jitter (puls to puls) Up to 100 MHz PRF >100 µJ per pulse Gaussian beam (long. and trans.)

Current choiceNow we are discussing possibilities to use APLQ-100-266 model laser from ATTODYNE Picosecond Lasers company which have following properties.

TODO

• Choose laser (=> optical scheme)• Make simulations• Choose optical elements• Choose diagnostics equipments• Setup laser and optical scheme (table,

transportation, alignment, diagnostics, …)• Make synchronization• Try to get electron beam!!!

Time scheduleTask Start End Duration

%Complete

2012

January February March April May June July August September October November December

Solenoid Fabrication 1/10/2012 4/2/2012 57 5.0

Solenoid Preliminary Measurements 4/3/2012 6/1/2012 42

Control System (Procure & Install) 10/1/2012 10/4/2012 62

Control Prepare for standalone mode 11/4/2012 4/9/2012 102

Control Integrate to FRONT /END 2/7/2012 30/10/2012 83

Laser (Project & Procure) 10/1/2012 22/5/2012 92

Laser install (pre-placement & alignment) 23/5/2012 6/7/2012 31

Laser integrate to control (F/E) 1/6/2012 14/9/2012 74

Laser measurements 15/9/2012 15/10/2012 19

Gun positioning 16/6/2012 13/8/2012 40

Cathode ready 14/8/2012 27/8/2012 10

Diagnostics (Project & procure) 10/1/2012 30/3/2012 56

Diagnostics (Test & Install) 1/4/2012 10/9/2012 112

Vacuum System Assembly 10/1/2012 30/3/2012 56

Vacuum (Test & measurements) 11/4/2012 11/6/2012 43

Vacuum ( F/E integration) 12/6/2012 1/8/2012 36

Cooling system (Project & procure) 10/1/2012 15/3/2012 45 5.0

Cooling test stand 16/3/2012 13/7/2012 83

Cooling (Assemble & measure) 2/7/2012 10/8/2012 29

Modulator repair 10/1/2012 12/4/2012 64

Klystron preparation 10/1/2012 12/4/2012 64

Klystron start-up & pre-commissioning 16/4/2012 22/6/2012 49

RF assembly & conditioning 2/7/2012 28/9/2012 62

Building & Infrastructure 1/3/2012 1/10/2012 148

Component installation & alignment 1/9/2012 30/10/2012 39

Machine commissioning 1/9/2012 30/11/2012 60

First beam 1/12/2012 20/12/2012 13

Thank you for attention!