Instrument

It was decided to upgrade the old fiber bundle A to make it a proper spare. The fiber bundle was removed from the telescope to be refurbished. The bundle is now at ESO with Gerardo Avila. Aarhus will provide new mechanical parts for the fiber couplings.

A problem occurred with the top calibration unit where the arm (to direct the light from the calibrations lamps) and the mask got out of position due to a low voltage problem. Both were realigned and the positions recalibrated. Also a power switch was made for the top calibration unit. There is still an issue with the mounting of the fiber arm which often gets miss-aligned and needs to be fixed properly.

Since the shutter model was changed stray light was entering so a baffle was installed around the fiber-spectrograph coupling. Also, the two large tubes in the front room that bring the fiber and electrical power into the FIES building have been sealed as these were potential sources of heat.

The small pickoff mirror on the guide probe used to redirect the light to the FIES fiber-head was cleaned.

The last components of the focus electronics of FIES that were affected by the lightning storm from last year were replaced. The still need to be tested in detail.