First two neutral beam absorbers, TAXN, arrive at CERN for HiLumi LHC

By Javier Fernandez Roncal and Florence Thompson (CERN)

Figure 1. Upper and lower clam shells of a TAXN unit delivered to CERN. Florence Thompson / CERN

The first two sets of copper clam shells for the neutral beam absorber (Target Absorber for Neutrals, TAXN) have been delivered to CERN, marking a key milestone in the procurement of the absorber cores for the High-Luminosity (HiLumi) LHC upgrade.

The TAXN is the new neutral beam absorber designed to replace the existing one, TAN, after Long Shutdown 3. Four of them will be installed,  one each side of the ATLAS and CMS collision points. TAXN’s function is to intercept forward high-energy neutral particles produced in the collisions,  thereby protecting the downstream dipoles (D2 and onwards), whilst providing sufficient aperture to meet the enhanced optics requirements of the HiLumi LHC.

Figure 3. Two sets of two copper clam shell units. Each box contains two clam shells to be placed together around a Y chamber to form one TAXN unit. Florence Thompson / CERN

With two sets of clam shells for the TAXN now received, two sets remain pending delivery and expected to arrive in the next couple of months. The absorbers will be assembled with Y_Chambers, cooling pipes, supports and other elements which will complete the assembly and be used to validate the cooling and bakeout cycle.

Figure 4. Layout around ATLAS and CMS collision points for HiLumi LHC. The inner triplet quadrupoles, which are the closest magnet assemblies to the collision points, are to be protected from the collision debris by a copper absorber called the Target Absorber for Secondaries, TAXS, which is a new and improved version of the current TAS. This intercepts charged and neutral particles, primarily pions and photons, leaving the collision point. After these first four quadrupoles (Q1, Q2a, Q2b and Q3), the first dipole, D1, deflects charged particles away. Neutral particles continue through and are intercepted by the TAXN. Image: CERN
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