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Photoelectron shield for the first mirror of a soft X-ray beamline
- Source :
- Journal of synchrotron radiation. 28(Pt 1)
- Publication Year :
- 2020
-
Abstract
- At a soft X-ray beamline with an undulator source, significant heat generation at the first-mirror chamber and light emission at the viewport were found, which can be explained by photoelectrons from the mirror. The chamber temperature increases up to approximately 50°C over a period of several hours. A photoelectron shield consisting of thin copper plates not only prevents the heat generation and light emission but also improves the pressure of the vacuum chamber, if a voltage of a few tens of V is applied to the shield. The total electron yield of the shield reached as much as 58 mA under high heat-load conditions, indicating the emission of numerous photoelectrons from the first mirror. Heat-balance analyses suggest that approximately 30% or more of the heat load on the first mirror is transferred to the surroundings.
- Subjects :
- 010302 applied physics
0303 health sciences
Nuclear and High Energy Physics
Radiation
Materials science
business.industry
030303 biophysics
chemistry.chemical_element
Undulator
Photoelectric effect
01 natural sciences
Copper
03 medical and health sciences
Optics
chemistry
Beamline
Heat generation
Shield
0103 physical sciences
Vacuum chamber
Light emission
business
Instrumentation
Subjects
Details
- ISSN :
- 16005775
- Volume :
- 28
- Issue :
- Pt 1
- Database :
- OpenAIRE
- Journal :
- Journal of synchrotron radiation
- Accession number :
- edsair.doi.dedup.....d091e6df60d646112bf19115c7e5cb93