IPAC'26 - the 17th International Particle Accelerator Conference

Design, Manufacturing and Testing by SIGMAPHI of the Pulsed Septa Magnets for the Booster To Accumulator Transfer Line Septa magnets in construction at Lawrence Berkeley National Laboratory (LBNL) for the Advanced Light Source Upgrade project (ALS-U)

MOP7077

18 May 2026, 16:00

2h

C.I.D

Board: Monday roquefort: RC01

Poster Presentation MC7.T16: Pulsed Technology (magnet and power supplies) Poster session

Speaker

Frédérick FOREST (SIGMAPHI)

Description

Advanced Light Source Upgrade project (ALS-U) is an upgrade project to the LBNL Advanced Light Source (ALS). The ALS is a 1.9 GeV storage ring operating at 500 mA of beam current. It is optimized to produce intense beams of soft x-rays, which offer spectroscopic contrast, nanometer-scale resolution, and broad temporal sensitivity. A new pulsed septum magnet system is required to build a Booster to Accumulator (BTA) transfer line. The system is made of the combination of a Thin septum which deliver a magnetic field of 0.4 T with a half sine pulse duration of 40 µs and a Thick septum which deliver a magnetic field of 1.378 with a half sine pulse duration of 100 µs. The leakage field seen by the circulating beam is lower than 64µTm (40 ppm of the integrated field) and the magnets are operated in Ultra High Vacuum below 5.10-9 torr.
The paper presents the design, manufacturing and testing of the septa magnets built by SIGMAPHI on the behalf of LBNL and delivered late 2025 to ALS-U.