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 To meet the injection-efficiency requirements, the former 16 mm circular cross-section has been replaced by a rhombic geometry providing a 20 mm horizontal aperture, 1.5 mm wall thickness and clearances above 1 mm to the magnet poles. Its structural response shows 7 MPa maximum stress with deformations of 1 µm horizontally and 1.4 µm vertically. 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 synchrotron 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 contribution presents the vacuum system status and the design, fabrication progress and initial tests 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.
| In which format do you inted to submit your paper? | Word |
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