Saint Petersburg, Russia
Saint Petersburg, Russia

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Arntz F.,Diversified Technologies, Inc. | Kardo-Sysoev A.,Ioffe PTI | Krasnykh A.,SLAC
Problems of Atomic Science and Technology | Year: 2010

SLIM (Stanford Linear Induction Method) is a novel short-pulse concept suited to a new generation of high gradient induction particle accelerators is described. The principal accelerator section is envisioned as a stack of coreless induction cells, the only active element within each being a single, extremely fast (subnanosecond) solid state opening switch: a Drift Step Recovery Diode (DSRD). Because the accelerating pulse is only nanoseconds in duration, longitudinal accelerating gradients approaching 100 MeV per meter are believed to be achievable without inciting breakdown.

Makarova T.L.,Umeå University | Shelankov A.L.,Umeå University | Lyubchik S.B.,New University of Lisbon | Serenkov I.T.,Ioffe PTI | Sakharov V.I.,Ioffe PTI
Journal of Nanoscience and Nanotechnology | Year: 2012

Irradiation with helium ions is an effective method for triggering ferromagnetism in graphite. Chemical inertness of helium suggests that local magnetic moment formation is determined solely by the intrinsic carbon defects created during the target damage. Interacting moments are located in two places: in the vicinity of the sample surface and near the point of maximum defect generation. Copyright © 2012 American Scientific Publishers All rights reserved.

Makarova T.L.,Umeå University | Shelankov A.L.,Umeå University | Serenkov I.T.,Ioffe PTI | Sakharov V.I.,Ioffe PTI
Physica Status Solidi (B) Basic Research | Year: 2010

To identify the origin of defect-induced magnetism in ion-irradiated graphite, a comparative study of samples of graphite irradiated with hydrogen H+ and helium He+ ions is performed. Directionally dependent magnetic properties, atomic/magnetic force microscopy studies suggest that the induced magnetic moments are located along the vertically aligned grain boundaries. Compared to the case of the hydrogen ion irradiation, the optimal helium irradiation dose is an order of magnitude lower. From this we conclude that the hydrogen chemistry is essentially irrelevant, and the ferromagnetic-like response of the irradiated graphite is due to structural defects regardless of their origin.Surface of HOPG irradiated with H+ and He+ at similar doses. © 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

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