Holger Kollmus - VBE-UHV 1 SIS100_1 ERDA Measurements ERDA – Measurements: Understanding of Ion Beam-Loss Induced Desorption.

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Presentation transcript:

Holger Kollmus - VBE-UHV 1 SIS100_1 ERDA Measurements ERDA – Measurements: Understanding of Ion Beam-Loss Induced Desorption

Holger Kollmus - VBE-UHV 2 Prospects elemet specific depth profiling of samples by detection of elastically scattered recoil ions surface - bulk information characterization of sample properties and possible modification under ion irradiation time resolved monitoring of sample evolution in situ cleaning of target using Xe-sputter gun access to physics of ion induced desorption Ion beam loss induced desorption is a serious luminosity limitation for SIS18

Holger Kollmus - VBE-UHV 3 Work Plan

Holger Kollmus - VBE-UHV 4 Milestones and Deliverables Milestones: 01-Jun-2005Influence of oxide layer on stainless steel determined 02-Jan-2006Desorption rates of activated and saturated getter materials measured 02-Jan-2007Decision on adequate chamber and/or collimator material and in situ cleaning methodes Deliverables: 01-Jun-2005Report on the influence of the oxide layer on the desorption yield of stainless steel targets 01-Jan-2006Summary result of ERD Analysis of pumping and saturated surfaces 31-Dec-2007Selection of adequate chamber and collimator materials based on ERDA measurements

Holger Kollmus - VBE-UHV 5 Status of ERDA-Experiment (a) Residual Gas Analyser Detector Xe Sputter Gun Beam  Target Holder Feedthrough Faraday Cup static vacuum mbar, only UHV-ERDA worldwide

Holger Kollmus - VBE-UHV 6 Status of ERDA-Experiment (b) beam times  Ca 10+ (III/2005): commissioning, desorption of silicon, influence of surface contaminations  Xe 18+ (III/2005): influence of oxide layer on stainless steel  today Xe 18+ : desorption of high purity copper, influence of oxide layer, desorption of gold terminated copper, secondary electron emission Ni Fe Cr Si O N C

Holger Kollmus - VBE-UHV 7 ERDA Results Silicon clear correlation between desorption yield and target modification clean Si in UHV  no desorption, only sputtering

Holger Kollmus - VBE-UHV 8 ERDA Results Stainless Steel clear correlation between oxide layer and desorption desorption can be only reduced to the bulk contamination level

Holger Kollmus - VBE-UHV 9 ERDA New Time Schedule Nr.Task ERDA Measurements 2Set-up of UHV-ERDA at the HLI, Commissioning 3Measurements with stainless steel targets and silicon influence of oxide layer 4Measurements with Copper and Gold coated Copper 5Desorption yield contribution of secondary electrons 6Desorption yield of pump. and satur. surfaces 7Exp. with layered targets, diff. barriers 8 Desc. on adequate chamber and or collimator material

Holger Kollmus - VBE-UHV 10 ERDA Milestones today we can report on: influence of surface contamination of silicon wafer influence of oxide layer on stainless steel (preliminary) soon we can report on:  desorption yield of OFHC copper, influence of oxide layer on copper  desorption yield of gold coated copper  first test on the influence of secondary electron emission we are slightly out of the time schedule, but we have reasonable progress we have slightly changed the scientific program due to recent results

Holger Kollmus - VBE-UHV 11 First Publication – GSI Scientific Report

Holger Kollmus - VBE-UHV 12 Personal an Financial Situation EUOCEUOCEUOC planned (PM) presently spent (PM) investment (€) presently spent (€) GSILMUTUD