RSS Fabry Perot

1. RSS Fabry Perot Ted Williams November 6, 2012

2. Stability Example from Nov. 1, 2011 MR etalon in 6600 Å region (6645 filter) FPRD requirement: ≤FWHM / 3 hr-1 = 1.6 Å hr-1

4. Stability Example from Nov. 1, 2011 MR etalon in 6600 Å region (6645 filter) Ne 6678 spectral line FPRD requirement: ≤FWHM / 3 hr-1 = 1.6 Å hr-1 Night-time result: ~ 1 Å hr-1 July 2011: A = 6666.92 Å November 2011: A = 6661 Å

5. Night Sky OH lines

7. Flat Fielding Issues Stellar photometry in FP images is similar to SALTICAM photometry shown earlier ~30% variation due to pupil variation ~5% differential vignetting over field With only pupil correction, some line profile distortion Current scheme: live with only pupil correction In (near?) future, use models to get to few %

8. Dual Etalon Status Mechanical alignment instability produces multiple reflection ghosts

9. Dual Etalon Status New mechanical design under consideration Currently MR single etalon has ~3 adjacent orders HR single etalon has ~15 adjacent orders Narrower filters near Hα may be purchased soon Caveat: calibrations can be confused Neon 6598 and 6678 are 1 MR order apart Monochromator delivered, will aid calibration

10. NGC 2280

11. NGC 2280