Speaker
Description
ALBA is upgrading its storage ring into a 4th-generation diffraction-limited facility, which demands redesigned vacuum chambers. Most of the 268.8 m ring, divided into 16 arcs, will use OFHC-Cu or CuCrZr to dissipate synchrotron radiation and minimize resistive-wall impedance. To meet the injection-efficiency re-quirements, former 16 mm circular cross-section has been replaced by a rhombic geometry providing a 22 mm hori-zontal aperture, 1.25 mm wall thickness and clearances of 1 mm to the magnet poles. Its structural response shows 13 MPa maximum stress with deformations of 3 µm. A short bellows is foreseen between each pair of BPM blocks to absorb chamber displacements from alignment tolerances and thermal expansions while keeping BPM positions fixed. At dipole positions, antechambers with crotch absorbers manage the radiation heat load, with each arc receiving 20.5 kW of power. The entire ring will be NEG-coated to accelerate conditioning and reach the required pressure of 1×10⁻⁹ mbar at 100 Ah. This contri-bution presents the vacuum system status and the design, fabrication progress of the prototypes.
Funding Agency
Work supported by Spanish MCIN and the European Union – NextGenerationEU project 28.50.460D.74903 from the Recovery and Resilience Mechanism.
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