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Apr 05, 2024 365 likes •526 views

Fabry-Perot Cavity R&D at Orsay Xing Liu Laboratoire de lAcclrateur Linaire photon : w f Linac S-band (3GHz) Laser w f ,max =4 g 2 w laser w laser electron q 1 bunch with 1nC every 20ms (scattered electron) g =E electron /m e

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SLIDE 1

Fabry-Perot Cavity R&D at Orsay

Xing Liu Laboratoire de l’Accélérateur Linéaire

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SLIDE 2

POSIPOL 2016 Linac S-band (3GHz) Transfer Line Ring ～16.7 MHz 18m

Compton scattering Photon_laser + ephoton + e’

electron Laser wlaser photon : wf

wf,max=4g2wlaser

(scattered electron)

g=Eelectron/mec2

q 1 bunch with 1nC every 20ms

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SLIDE 3

POSIPOL 2016

Optical cavity

Hexapod feets

33 MHz 150 W

The power inside the cavity: MW-leval

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SLIDE 4

POSIPOL 2016

ThomX prototype cavity

  • R&D for ThomX
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SLIDE 5

POSIPOL 2016

Decrease thermal effects -> New substrates

  • ThomX: ULE mirrors (Ultra Low Expansion glass)
  • Deformation : 55x less than Silica
  • Already demonstrated
  • LMA Coating (Lyon, France)
  • Theoretical finesse ~ 28000
  • Theoretical gain ~ 15000
  • Power transmission coefficients

M1: 180 ppm M2, M3, M4: 2 ppm

Total losses by absorption/scattering: 40 ppm

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SLIDE 6

POSIPOL 2016

New mirrors implementation

  • Optical surface test bench

ULE mirrors (new) Mightylaser silica mirrors

 ULE mirrors

  • Theoretical finesse: 28000
  • Measured finesse: 26000 (4 different methods).
  • Gain ~ 12000
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SLIDE 7

POSIPOL 2016

Finesse measurements. F: 26000

7 Ringing Fast ramping AOM cut Linewidth & FSR F: 27700 F: 26600 F: 24700 F: 26900-28000

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SLIDE 8

POSIPOL 2016 Laser oscillator Amplifier Optical cavity

IP

<P> ~ 10 mW

<P> ~ 150 W

<P> ~ 500 kW e- ring Stretcher Compressor

  • Amp. #3
  • Amp. #2
  • Amp. #1

5 mW 150 W

Goals: stack as much average power as possible in an optical resonator1MW

ThomX Laser amplification system:

CELIA Lab. (Bordeaux) & Pierre Favier (LAL)

CFBG: Chirped Fiber Bragg Grating CVBG: Chirped Volume Bragg Grating

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SLIDE 9

POSIPOL 2016

Schematics

1st stage 2nd stage 3rd stage Compressor

ThomX fiber amplifier

all fiber connectorised (spliced)

Stretcher

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SLIDE 10

POSIPOL 2016 DC YDF 12/130 PM COMB

9 W @ 976nm

2 W

YDF 6/125 PM WDM

200mW @ 976nm

YDF 6/125 PM WDM

600mW @ 976nm

1 mW 100 mW 40 mW 330 mW

Pre-amplifiers

6 x 55W @ 976nm

COMB

DC YDF 40/200 PZ

Main amplifier 6x 55 W

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SLIDE 11

POSIPOL 2016

laser system

Max power: 210 W Stability over 90h @ 104 W : 210 W h=69%

ThomX 150 W fiber amplifier: power

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SLIDE 12

POSIPOL 2016

las laser r system

0A/4W 5A/97W 8A/158W 11A/200W

ThomX 150 W fiber amplifier: beam quality

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SLIDE 13

POSIPOL 2016 Laboratoire Accelerateur Lineaire Site of Thom X

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SLIDE 14

POSIPOL 2016

electrons

Remote control Rehabilitation Building

jan april july oct jan april july oct jan april july oct

RX for the first user

jan april july oct

Purchase, Tests & ensamble sub-systems Today

  • Install. Andromède

2015 2016 2017 2018

  • Install. + Comfm. Tech. ThX

equipement

  • peration

X-Rays Commissioning

Planning of ThomX

Cassou, Chiche, Cormier, Douillet, Favier, Jehanno, Lhermite, Liu, Martens, Peynaud, Plaige, Rusquart, Soskov, Trochet, Zomer.

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SLIDE 15

POSIPOL 2016

Thank for your attention !