All the exposures below were for 8s; the standard arc exposure is 2s, but only one out of four lamps was plugged in.

All the following plots have the same vertical scale, and show every 40th spectrum on the image.
The single red, yellow, blue, green, and black traces are spurious.

Four images are shown for each of three wavelength ranges: one "existing" Ne-only lamp exposure, and three exposures from the new lamps. The existing Ne lamps are relatively stable, but the new lamps change significantly between exposures. Note that at the dimmest (exposure 39112, the middle exposure), the new lamp Ne lines are dimmer than those in the existing lamps, and at brightest are twice as bright. The new lamps do show Ar lines.

I do not know how long the new lamps had been on when the first exposure was started, but the three exposures were taken in quick succession.

8400 to 9200 Angstroms

This range shows the red end of the detector; there should be usefully bright Ar lines at 8424 and 9123 A.

Existing, operational, Ne-only lamps: 8400 to 9200 Angstroms:




Proposed lamps, exposure #1: 8400 to 9200 Angstroms:




Proposed lamps, exposure #2: 8400 to 9200 Angstroms:




Proposed lamps, exposure #3: 8400 to 9200 Angstroms:




7450 to 8200 Angstroms

This range shows one of the wider stretches without strong Ne lines, and is just redward of a bright Ne line.

Existing, operational, Ne-only lamps: 7450 to 8200 Angstroms:




Proposed lamps, exposure #1: 7450 to 8200 Angstroms:




Proposed lamps, exposure #2: 7450 to 8200 Angstroms:




Proposed lamps, exposure #3: 7450 to 8200 Angstroms:




Full r1 coverage

This range shows the full red side. Can't say I know how you get 120k e- with a gain of 1.low, but the relative scale should be OK (and interesting).

Existing, operational, Ne-only lamps: PS file:




Proposed lamps, exposure #1: PS file:




Proposed lamps, exposure #2: PS file:




Proposed lamps, exposure #3: PS file: