CERN Accelerating science

Article
Title	Beam Energy Scaling of Ion-Induced Electron Yield from K+ Ions Impact on Stainless Steel Surfaces
Author(s)	Kireeff-Covo, Michel ; Baca, David ; Barnard, John J ; Bieniosek, Frank ; Celata, C M ; Cohen, Ronald ; Friedman, Alex ; Grote, D P ; Kwan, Joe W ; Lund, Steven M ; Molvik, Arthur ; Seidl, Peter ; Vay, Jean-Luc ; Vujic, Jasmina L ; Westenskow, Glen
Affiliation	(LBNL, Berkeley) ; (LLNL, Livermore, California) ; (UCB, Berkeley, California)
Publication	2005
In:	21st IEEE Particle Accelerator Conference, Knoxville, TN, USA, 16 - 20 May 2005, pp.2287
Subject category	Accelerators and Storage Rings
Abstract	The cost of accelerators for heavy-ion inertial fusion energy (HIF) can be reduced by using the smallest possible clearance between the beam and the wall from the beamline. This increases beam loss to the walls, generating ion-induced electrons that could be trapped by beam space charge potential into an "electron cloud," which can cause degradation or loss of the ion beam. In order to understand the physical mechanism of production of ion-induced electrons we have measured impact of K+ ions with energies up to 400 KeV on stainless steel surfaces near grazing incidence, using the ion source test stand (STS-500) at LLNL. The electron yield will be discussed and compared with experimental measurements from 1 MeV K+ ions in the High-Current Experiment at LBNL.*