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DRAFT<br />

eration demand. In case of peak loads (e.g. change of the operation modes) liquid helium can be<br />

provided from the liquid storage tanks.<br />

2.4.A4.3 The Helium Distribution System<br />

The distribution of the cold helium from the two refrigerators to the individual consumers is organised<br />

via transfer lines and distribution boxes. The consumers are located at some distance from<br />

one another and are accessible only through radiation shielded tunnels. In Figure 2.4.150 the basic<br />

concept of the distribution system is shown.<br />

Refrigerator<br />

Coldbox<br />

Primary<br />

Transfer Line<br />

Figure 2.4.150: Schematic helium distribution system.<br />

Distribution<br />

Box<br />

Secondary<br />

Transfer Line<br />

Distribution<br />

Box<br />

Feed<br />

Boxes<br />

The primary transfer lines connect the refrigerator with the distribution boxes that supply the<br />

secondary transfer lines. From there helium flows to the feedboxes of the different sections. Figure<br />

2.4.151 gives more details about the allocation of the users to the three distribution boxes and to the<br />

corresponding refrigerators. The expected mass flow rates for the different users are given as well.<br />

The upgrade version for the triangular mode of SIS100 is marked in green.<br />

Users<br />

184

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