Magnets & Pulsed Magnets

Magnets & Pulsed Magnets

The Magnets and Pulsed Magnets Operative Unit is in charge of the following tasks:
  • To develop and built pulsed power circuits, which drive the pulsed magnets, needed for the injection/extraction processes.
  • To develop the design of suitable pulsed magnets to be connected to the circuits mentioned above.
  • To run and maintain the power circuits of the Elettra injection system.

In the past the Unit has realised two main systems:

  • The Elettra storage ring injection system (1991 - 1993)
  • The Bessy 2 storage ring injection system (1995 - 1997)
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The Injection system of Elettra

A long straight section of the storage ring has been dedicated for the installation of the injection system, which is composed by 4 Kickers and 2 Septa including all the equipment (vacuum and mechanics) needed to keep it in operation. The Kickers are identical magnets operating in air and placed symmetrically with respect to the center of the section; the Septa are again identical magnets, but they operate in vacuum.

Both power circuits are based on a capacitive discharge design; the kicker circuit adopts a resistive recovery, while that one of the septum an inductive recovery.

The characteristic parameters of the injection process can be summarised as follows.

General parameters Value
Beam injection energy 1 GeV
TL-SR angle 8.6 degr
Kicker bump (nominal) 18 mm
Pulse repetition rate 10 pps
Free space available within straight section 6 m

Table 1 - Storage ring injection general parameters

Kicker magnet operating parameters @ 1 GeV
Core length 600 mm
Peak magnetic field 0.1 T
Peak current 4.0 kA
Capacitor charging voltage 7 kV
Current pulse length 5 ms

Table 2 - Kicker magnet operating parameters

Septum magnet operating parameters @ 1 GeV
Core length 720 mm
Peak magnetic field 0.4 T
Peak current 4.6 kA
Capacitor charging voltage 0.8 kV
Current pulse length 50 ms

Table 3 - Septum magnet operating parameters

The papers, posters presented at various congresses and internal technical notes, written by the Unit are mainly related with the development of the Elettra injection system and with its subsequent installation and commissioning. They can be summarized as follows.


[1] R. Fabris, A Favari, D. Tommasini : "A high current passive Septum magnet for Elettra"; 3rd EPAC - Berlin, March 1992

[2] D. Tommasini, P. Tosolini: "High current, high voltage pulser for the Elettra Kicker magnets"; 3rd EPAC - Berlin, March 1992

[3] D. Tommasini: "The Elettra fast magnets"; 3rd EPAC - Berlin, March 1992

[4] R. Fabris, F. Daclon, M. Giannini, D. Tommasini, P. Tosolini: "The Septum magnet system of Elettra"; PAC - Washington, May 1993

[5] D. Tommasini: "Injection into the Elettra storage ring"; PAC - Washington, May 1993

[6] R. Fabris, D. Tommasini, P. Tosolini: "Performance of the Elettra injection system"; 4th EPAC - London, June 1994.

Technical notes

[1] D. Tommasini, "Determination and design of Septa magnets for Elettra"; ST/M- TN- 90/16.

[2] R. Fabris, D. Tommasini, P. Tosolini, "Test results of the 8.35 kA, 15 kV, 10 pps pulser prototype for the Elettra Kickers"; ST/M-92/12.

[3] R. Fabris, "Injection Magnets test results"; ST/M-93/2.


photoPiergiorgio TOSOLINI

Work: +39 040-375-8242
Work: +39 040-375-8395
Mobile: +39 3346998148
photoWalter CORTIVO

Work: +39 040-375-8250
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Last Updated on Wednesday, 24 August 2011 12:52