Normal Conducting Linac (NCL)
Preparations for beam commissioning, scheduled to start in October, continues. Chopper tests for the Medium Energy Beam Transport (MEBT) section are completed. The Radio-Frequency Quadrupole (RFQ) is ready for beam. A hydrogen permit was granted for the Ion Source and the system is now subject to tests.
Drift Tube Linac (DTL) tank 1 is installed, and couplers have been mounted. Cooling has been connected and leak tests are performed. RF conditioning of DTL1 will follow once the beam commissioning activities are completed. The DTL water skid in FEB 100 still remains to be reassembled with updated reconfiguration. In the DTL workshop, installation of copper parts and connection of tuned modules for the DTL tanks is ongoing.
Linac Warm Units
A clean room is in place for preparation of the Linac Warm Units (LWUs), enabling a particle-free installation. The purpose of a particle-free environment during installation is to minimise contamination of the inner surfaces of the beam transport piping and cryomodules. Right now the cryomodules are substituted by a dummy pipe. 31 LWUs are already in place in the tunnel, with three more units arriving shortly. In total, there will be 59 LWUs.
The end box for the spoke cryogenic distribution system is in place in the tunnel. The helium supply, used to cool down the cavities of all cryomodules, will flow to the end box where it is reversed and returned to the cryoplant via a helium collector pipe already installed.
All spoke valve boxes are in place, but connection of header units in-between the valve boxes remains.
The second serial-produced medium beta cryomodule (CM03) is now inside the test stand bunker and is being connected to the equipment for cooling and power tests to start shortly.
RF power stations
Two RF power stations for the spoke section have now been tested in cell 120 of the Gallery building, with the third in line just started its test cycle. These tests are performed with the power going to a local dump, and is not yet involving the RF distribution system.
Monolith – Port Tubes
This week the first neutron beam port tubes were lifted down from the high bay to the R6 area surrounding the Monolith vessel. Port tubes are rectangular-shaped ducts which will serve as housing for the first few metres of neutron beam instrumentation to be inserted here. 39 port tubes will be welded to the Monolith vessel, starting in October.
Assembly of the floor valves from high bay to the Active Cells continues, with site acceptance test planned for mid-October.
Installation of the upper intrabay door continues between the process and maintenance cells. This folding shielding door weights approximately 58 tonnes.
Mounting of aluminium lamellas on the Target roof steel structure continues. West areas protruding over the D08 lab, the Target Entrance building and Transport Hall are substantially completed with only special panels in joints and connecting areas remaining.
Metal panels are mounted for the facades of the A2T building, with a view to have all facades in place by the end of this month. Cladding of the cantilever roof will follow on this side of the Target building.
Neutron shielding bunker
Mounting of the side wall shielding blocks for the west sector bunker inside Experimental Hall 2 started this week.
Reinforcement of the bunker crane runways are in progress. The modified cranes are in preparation at the manufacturer in Norway, and will be installed on site before the end of the year.
Access to instrument caves
Steel bridge walkways are in place along the internal walls of the two short instrument halls. Once beamlines, caves, control hutches and all associated equipment for the instruments are installed, most of the floor space pf these large halls will be occupied. To reach the instruments, stairs and bridges will be constructed across the rooms.
Rows of lower shielding blocks have been put in place for the beamlines for instruments CSPEC and BIFROST.