unaffected except in intensity. Work is heavily underway to energize the web roller for polymer tests. The transport mechanism has been positioned and the control panels mounted. Electricians are hooking up the power mains today. We did a quick check of the downstream optical cavity mirror and discovered that a mounting screw had worked loose. It was retightened and the system pumped back down.

FEL Commissioning Activities

We discussed the hardware and software tasks to achieve 1 kW Lasing. Although there has been significant progress on the list most tasks remain only partially complete. Efforts need to focus on the must-have actions for the 1 kW lasing.

Hardware progress toward getting the beam recirculated is farther along. Significant installation activity during the last week has moved us closer to completion of the systems. Most systems are in place and believed to be operational. That is, we will find out next week during beam operations what remains on the punch list. All system owners are to perform a hot check of their system before signing it off by next Thursday.

A 5F region BPM is unavailable due to our failure to fix the vacuum leaks on the feedthroughs. A second try is underway but if that fails we will remove a BPM in the 4F region (IPM4F09) on Monday and install it in the 5F region so we have at least minimal diagnostics there. MPS checkout will proceed next Tuesday so that we have permissives for recirculation when we come up on Thursday. Initial plans will be to lase at 5 microns using the high power 10% outcoupler mirrors.

A schedule has been produced for the next two weeks which has us doing that lasing, doing initial recirculation, and providing light for the first user demonstration in Lab1.

We went over in detail the remaining "Subsidiary Tasks for Phase-Space Metaprocedure", and the revised list is published in the Commissioning meeting minutes from July 17.

J. Boyce presented the eight remaining open actions from the ARR which must be accomplished before routine operation of the user facility can proceed. All actions got assigned and only one appeared to have significant impact: closing the shutter to the user lab when the machine is off for extended periods. K. Jordan is looking at the PLC implications of that requirement and the best method to incorporate the change.