Cable routing and trays
Modulator Hall
Present: Y. Gouez, J.M. Gay, J. Turloni, M. Dubrulle, T. Brochard, B. Joly (notes)
The cable trays will be installed overhead, above the bays, as is the case in the Technical Zone for the SRTU. They will be supported primarily by structures anchored to the floor at the end of each rack row, in addition to support from the tunnel wall and a few support points on the racks themselves. This solution is preferred over ceiling suspension in order to minimize vertical space requirements.
The cables will be routed to the tunnel at ground level. They will therefore run down from the racks to the floor on the Modulator Hall side, pass through the wall at that level, and then continue along the floor on the tunnel side to the girders and cavities.
On the tunnel side, sufficiently robust cable trays must be provided, along with mechanical guards to be placed above the cables, similar to those already in place in the SRTU.
The cable trays currently located along the tunnel wall on the Modulator Hall side will be extended to the modulator area, or even to the small laser room if necessary. There are currently four trays, likely 200 mm wide (to be confirmed). Depending on the number of cables to be installed, only some of these trays will need to be extended.
An emergency shut-off switch must be installed near the COLD bays. In the event of a problem, it must cut off power to all bays and modulators (including those of the current Linac), but without turning off the lighting.
The electrical racks and modulators for COLD are scheduled to be installed in January 2027, after the winter shutdown. Work on installing the cable trays and power supplies could therefore begin in late January or early February 2027, during the USM (to be confirmed with Isabelle depending on other work).
For the two 19-inch power strip panels planned for each rack, it is essential to use French-standard outlets with an exposed ground pin, rather than the German standard with side ground contacts. The cables powering these panels will not require outlets at their ends: they must run up to the top of the rack and be connected in junction boxes.
In response to this meeting, T. Brochard will send us an updated, dimensioned drawing incorporating the comments and decisions we made together this afternoon (1,000 mm spacing between bays if possible, otherwise 900 mm; the number of bays increased to 12...).
He will also provide the average distance between the bay area and the farthest point on the girder, on the tunnel side. This information will help us determine the specifications for the cables to be used, particularly their cross-sectional area, as well as for the power supply to the magnets.