This was supplied in hardcopy only, for the purpose of the Phase B review in Leiden on July 19 1999. The RSAA team was thanked for its tremendous efforts.

Here is a summary (by Koen Kuijken) of the issues raised:

Technical issues:

• filter round or square. Decision requires us to check footprints of beam at the location of the filter, as well as better understand the manufacturing issues. Action by Nigel (optical design), NFRA (who will make the hole).
• gratings. everybody happy with 600-line gratings in V shape. 1200-line grating for single-grating mode would be great---cost this.
• AR coatings. Cost estimates to be verified. Could be significant overrun.
• Halpha arm. Concensus seems to be that operations at WHT could be done with 3 observatory CCDs, but at TNG this is very unlikely. If we want to acquire our own CCD for the Halpha arm, it might be desirable to make this one that fits naturally into TNG's data acquisition system. Could consider funding a TNG CCD on condition that we can use it for PNS when required, in exchange for their maintaining it. It might also be possible within the developing La Palma cooperatin agreement to use a ING CCD at TNG. Action by Magda on TNG CCD, controller and data acquisition situation; by KK on WHT situation.
• Matrix mask design to be finalized. Action Nigel
• Dichroic: manufacturer, cost? Action Nigel
• Ghost problem looks to be solved with the 600-line grating.
• Account details of AAO to be provided to Magda. Action KK

Halpha arm funding: explore possibility to find UK collaborator, who would also bring in more WHT access. Mike Merrifield to be approached.

Lyman-alpha interlopers. Looks as if spectral resolution will catch many of these (Ly alpha widths are larger than for PNe in known cases from 2DF work). Otherwise Halpha or 4959 could be a useful diagnostic, but not perfect since fainter than O[III] and hence not detectable in faintest PNe. Checking results on nearby starbursts would be useful to see how effective spectral OIII line width is as a discriminant.

Document date: October 14, 1999