CERN Accelerating science

Article
Report number CARE-CONF-04-042-SRF ; CARE-CONF-2004-042-SRF
Title First Experience with Dry-Ice Cleaning on SRF Cavities
Author(s) Reschke, D ; Brinkmann, A
Affiliation (DESY, Hamburg BUW, Wuppertal IPA, Stuttgart)
Publication 2004
In: 22nd International Linear Accelerator Conference, Lubeck, Germany, 16 - 20 Aug 2004, pp.776
Subject category Accelerators and Storage Rings
Abstract The surface of superconducting (s.c.) accelerator cavities must be cleaned from any kind of contaminations, like particles or chemical residues. Contaminations might act as centers for field emission, thus limiting the maximum gradient. Today's final cleaning is based on high pressure rinsing with ultra pure water. Application of dry-ice cleaning might result in additional cleaning potential. Dry-ice cleaning using the sublimation-impulse method removes particulate and film contaminations without residues. As a first qualifying step intentionally contaminated niobium samples were treated by dry ice cleaning. It resulted in a drastic reduction of DC field emission up to fields of 100 MV/m as well as in the reduction of particle numbers. The dry ice jet caused no observable surface damage. First cleaning tests on single-cell cavities showed Q-values at low fields up to 4x10<sup><font size="-1">10



 Record created 2006-01-31, last modified 2024-02-23


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