INFN collaboration: High order correctors and D2 recombination dipole
The last batch of the 54 high order corrector magnets was successfully tested in LASA by the end of 2022, and all correctors have been delivered at CERN. In February 2023, a celebration was held to mark the end of the first series production of HL-LHC magnets (see Figure 1, left). The horizontal test of the prototype D2 cold mass has been successfully carried out last winter: the magnet reached ultimate current with only one training quench. No retraining was needed after a thermal cycle: ultimate current was reached without quenches (see Figure 1, right). After the third cool-down, the magnet was able to operate at ultimate current also at 4.5 K, corresponding to 97% of short sample limit. In ASG, the first aperture of the first series magnet was completed, validating the corrective actions on b5, and coil production is ongoing.
CIEMAT collaboration: Nested dipole orbit correctors
Since last newsletter three short nested correctors have been qualified for installation: the first and second magnets fully manufactured in Elytt, and a retrofit of the second prototype with new inner coils to cure the performance limitations initially observed due to the torque developed by nested configuration. The first long corrector has been manufactured in CIEMAT and assembled at CERN; it also reached nominal performance requirements. The corrector package cold mass has been completed, integrating the nine high order correctors with the nested corrector from CIEMAT (see Figure 2, left), and inserted in the cryostat (see Figure 2, right) in early spring 2023.
In kind contribution from China: canted cos theta correctors
In China, the corrective actions carried out to reduce the virgin training observed in the first two magnets (see HLCB Newsletter of 2022) have been successful, as proven by powering tests of the third series magnet carried out in IHEP and IMP (see Figure 3): the magnet is now on its way to Europe. A review of the manufacturing procedures has been completed in BAMA, where coil production has restarted. CERN is manufacturing two correctors with components provided by China.
In kind contribution from Japan: D1 separation dipole
The prototype D1 has been shipped to CERN in April 2023, and the magnet cold mass is now ready to be integrated in the final cryostat (see Figure 4, left). The horizontal test is foreseen in SM18 in the fall of this year. The first series magnet has been completed in Hitachi, and it reached ultimate current during the vertical powering test in KEK (see Figure 4, right). During the second powering after a thermal cycle, the magnet reached ultimate without quench. Testing is still ongoing at the time of writing this newsletter. Assembly of the second series magnet is also ongoing in Hitachi.
In kind contribution from the US: MQXFA triplet quadrupoles
In the US, seven magnets are qualified after vertical powering tests for assembly in the cold mass. In January 2023, the test of magnet MQXFA8b proved the ability of replacing a limiting coil to cure performance limitations . The first cold mass including the first two series magnets has been completed, integrated in a cryostat, and reached the required performance for operation at 7 TeV without quenches in the horizontal test station (see Figure 5): this is a significant step in the AUP (LHC Accelerator Upgrade Project). The first thermal cycle is ongoing, and the powering tests will be completed in early summer.
