7. Update on Injector for
Radioactive Ion Species 2 (IRIS2)
(B. A. Tatum, spokesperson)
The IRIS2 Project will be completed this Fall. Suspension of HRIBF operations following the July 2008 Operational Emergency had a positive impact on the project for several months relative to installation activities, but the resumption of operations and required Authorization Basis documentation updates have slowed down some of the commissioning activities. Nevertheless, substantial progress has been made.
Installation of most equipment is complete. The injector and transport beamlines are fully assembled, tested, and operational. This includes the transport beamline 35 degree and 90 degree electrostatic deflectors.
The modular laser room has been installed, and drilling of the 8-inch diameter hole for the laser and utility port plug through the 9.5-foot-thick concrete shielding wall has been completed. Laser safety system procurement is underway, and a segmented polyethylene plug with three laser beam conduits and two utility conduits is in fabrication.
Iron storage boxes for storing activated target ion sources have been received, as well as the contamination control boxes. The activated target ion source storage area outside of the target room has been constructed. This is a concrete wall storage compartment that will accommodate up to six of the iron boxes. A below the hook lifting fixture for manipulating the boxes with the existing 12.5 ton bridge crane has been tested and approved for use. Testing and programming of the target room crane is in progress in preparation for commissioning. Pick-up and set-down points within the room are being finalized.
The Operational Readiness Review was not received as early as expected, but most findings have been addressed with the primary exception being the completion of revisions to the HRIBF Safety Assessment Document (SAD) and the Accelerator Safety Envelope (ASE). Although the revisions that are specific to IRIS2 are straightforward, other revisions that are associated with our July 2008 Operational Emergency are more complex. We are in the process of incorporating Accelerator Safety Review Committee (ASRC) comments on our draft revisions and expect these documents to be approved in early September. This delay has not impacted IRIS2 stable ion beam commissioning, but RIB commissioning cannot begin until the updated SAD and ASE are approved.
Stable ion beam commissioning has proceeded quite well. Beam has been transported from the target ion source through the injector and transport beamlines into beamline 12, the existing isobar separator beamline. The 1st-stage mass separator has been optimized for maximum mass resolution. Mass separation of 131Xe and 132Xe has been demonstrated, with a measured resolving power of m/Δm = 1250 (error bars of +/-30), as shown in Figure 7-1, and we continue to optimize beam optics components and transmission.
Figure 7-1: Screen capture of the Beam Profile Monitor (BPM) display showing the horizontal profiles of the separated isotopic beams of Xe at the image position of the separator magnet system. Units are arbitrary.