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Construction is complete on BL5-4, the new low energy (10-40 eV) branch line based on a dedicated high resolution SCIENTA photoelectron spectrometer and a Normal Incidence Monochromator (NIM). The branch line is located between the old BL5 monochromator and BL6. The monochromator was delivered in mid June. A lot of hard work was put in by both vacuum and mechanical staff to install the mono and the beam line components before the end of the run. Commissioning was started on July 25th with first light through the entire system on July 28th.
Commissioning will continue during the FY '98 run, interspersed with user running on 5-2 and 5-3. There are a number of major tasks still to be done. First is integration of the control system software and hardware. This should be ready for testing by the start of the run. Delivery and installation of the full set of three gratings is expected in early November. The platinum coated glass horizontal refocusing mirror will be replaced with a silicon mirror with higher reflectivity. With the beam line in its final configuration the goals are to optimize the performance and characterize the monochromatic light with a gas cell. The dedicated end station with the SCIENTA spectrometer will then be moved on line and used to characterize the higher order contamination. Commissioning should be completed during this year's run.
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