Power supplies for LINAC at GSI-FAIR

FAIR stands for Facility for Antiproton and Ion Research. This accelerator facility provides beams of antiprotons and ions with highest intensities, energies and power in brilliant quality. FAIR is a multipurpose and worldwide unique accelerator facility allowing a large variety of unprecedented fore-front researches in physics and applied science.

Today, a new part of the facility is being built including, among other things, a p-LINAC.

A significant part of the experimental program at FAIR is dedicated to antiproton physics. Antiprotons in FAIR will be used for two types of experiments:

• High energy experiments in the High Energy Storage Ring (HESR), namely PANDA (Proton Antiproton Annihilations at Darmstadt)
• Low energy experiments in the FLAIR (a Facility for Low-energy Antiproton and Ion Research) cave

In the FAIR Modularized Start Version (MSV) only PANDA is foreseen as a user of antiprotons. The antiproton will be produced by shooting a short intense proton bunch with 28 GeV on a copper target.

A dedicated proton LINAC of 68 MeV final energy, SIS18 is used for acceleration to 4 GeV and SIS100 for an acceleration to 27.6 GeV. The proton beam is foreseen to be generated in an ECR type proton source and a proton current of up to 100 mA can be extracted at 95 keV.

The subsequent Low Energy Beam Transport (LEBT) is based on two-solenoid magnetic focusing and provides the required separation of H3+, H2+, and H2 fractions from the proton beam. Bunching and acceleration to 3.0 MeV will be accomplished in a ladder type 4-rod RFQ preceded by an electrostatic chopper.

JEMA will provide a total of 33 power converters that will power the different magnets of the new FAIR proton LINAC facility: 25 power converters will be used for powering quadrupole magnets and 8 for powering the steerer magnets.

More precisely, we will provide 17 cabinets including:

• 12 power converters of 60V – 1000A
• 12 power converters of 105V – 1000A
• 1 power converter of 120V – 400A
•  8 power converters of 24V – 250A

All 33 converters providing 1×10-4 long term stability and precision. Moreover, each power converter will be designed according to customer requirements.