1. Precise wavelength reference for Spirou F. Pepe, F. Wildi, B. Chazelas, C. Lovis, S. Udry

2. The wavelength calibration px  i ref xixi xx Thorium lines Achieved Δ  : (Absolute) accuracy: 5 x 10 -8 Scale factor: 3 x 10 -8 Repeatability: 6 x 10 -10 (= 20 cms -1 )

3. The perfect calibrator Cover full spectral range Constant line spacing Lines width < spectrograph resolution High density of lines, up to one per ~2-3 SE All wavelengths precisely known and stable Homogeneous line intensities, high ‘brightness’ Fabry-Pérot or Laser frequency comb

4. The perfect calibrator

5. HARPS FPCS System Vacuum control Temperature control Light source

6. HARPS Fabry-Pérot Assembly

7. Fabry-Pérot at La Silla Calibration Unit

8. FPCS Spectrum with HARPS

9. FPCS Specifications

10. FPCS short-term RV-stability Time series of 7 hours

11. FPCS long-term RV-stability Nightly calibration over 80 nights

12. New-generation FPCS Mechanics instead of glass work (maintenance) New white light source (reliability and costs) Mirrors instead of lenses (wide range, IR) for collimator and camera Optimize etalon for stability and throughput over the specified spectral range Etc.

13. Spirou FPCS configuration Supercontinuum laser or LDLS (laser-driven Xe) Fiber-link from source to vacuum vessel Vacuum vessel (fiber in- and output) Thermal control FPCS opto-mechanics (support and mirrors) FP etalon Fiber from vacuum vessel to calibration unit Interface: Standard FC or SMA fiber connector (Etendue TBD)

14. LDLS light source Up to 2400 nm ! (like 10’000 K BB)

15. New opto-mechanics design (in progress)

16. Spirou FPCS capital cost Light source: 25’000 EUR FP etalon: 20’000 EUR Vacuum vessel: 10’000 EUR Vacuum gauges and control: 15’000 EUR (TBC) FPCS opto-mechanics: 25’000 EUR Thermal control: 5’000 EUR Fibers: 2’000 EUR Total: 102’000 EUR (TBC)

17. Spirou FPCS manpower costs Requirements definition: 0.1 FTE Design optimization: 0.3 FTE Procurement of components: 0.2 FTE Opto-mechanics manufacturing: 0.5 FTE Assembling and adjusting: 0.2 FTE Testing and tuning: 0.2 FTE Total: 1.5 FTE (TBC)

18. Spirou FPCS travel costs Roughly 10’000 EUR per phase (depends strongly on number of meetings and reviews) Total: 40’000 EUR (TBC) Does not include participation to (other) workgroups