Free electron laser with advanced wiggler
AssigneeCommissariat a l'Energie Atomique
InventorDaniel Iracane
Life of this patent
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Abstract
A free electron laser with an advanced wiggler. The wiggler is suitable for creating a transverse magnetic field with two periodicities (P1, P2). This thereby results in the emission spectrum being significantly reduced.
Claims10
Free electron laser including means to form a beam of electrons and introduce this beam along the axis of a wiggler, this wiggler including means to generate along the axis of the wiggler a transverse magnetic field whose direction alternates periodically along the axis of the wiggler, wherein the wiggler includes means for generating the magnetic field so that said magnetic field is the superposition of one first field whose direction alternates with one first periodicity along the axis of the wiggler and a second field whose direction alternates with a second periodicity along the axis of the wiggler.
Free electron laser according to claim 1, 15 wherein the first field has one first periodicity P1 and one first amplitude B1 and the second field one second periodicity P2 and one second amplitude B2, the relative difference (P2-P1)/P1 of the periodicities about several percentages and the second amplitude B2 is about one tenth of the first amplitude B1.
A free electron laser for generating a laser beam and introducing the laser beam along a predetermined axis of a wiggler, the wiggler generating a magnetic field and comprising:
- first and second sub-units disposed symmetrically along the predetermined axis, each of the first and second sub-units comprising:
- a plurality of pole pieces;
- a plurality of permanent magnets alternating with the plurality of pole pieces;
- wherein the first and second sub-units are offset by ninety degrees;
- and
- wherein the first sub-unit generates a first field of a first periodicity and the second sub-unit generates a second field of a second periodicity, the first and second fields being superposed to generate the magnetic field of the wiggler.
Dependencies are inferred from the claim text.