Hilcker, Michaela (2020)
A superfluid liquid helium target for electron scattering experiments at the S-DALINAC.
Technische Universität Darmstadt
doi: 10.25534/tuprints-00012811
Ph.D. Thesis, Primary publication
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Item Type: | Ph.D. Thesis | ||||
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Type of entry: | Primary publication | ||||
Title: | A superfluid liquid helium target for electron scattering experiments at the S-DALINAC | ||||
Language: | English | ||||
Referees: | Pietralla, Prof. Dr. Norbert ; Enders, Prof. Dr. Joachim | ||||
Date: | 6 August 2020 | ||||
Place of Publication: | Darmstadt | ||||
Date of oral examination: | 24 June 2020 | ||||
DOI: | 10.25534/tuprints-00012811 | ||||
Abstract: | The aim of this work was to develop a superfluid helium target for electron scattering experiments at the S-DALINAC. The target consists of a multistage helium cryostat including target cell and corresponding scattering chamber. It is initially filled with liquid helium at boiling temperature and then cooled down to 1.8 K via vapor pressure reduction. The infrastructure of the QCLAM spectrometer provides a set of basic conditions for the design. Difficulties in handling liquid helium provide further challenges. After the delivery of the required components, the cryostat had to be assembled and tested. The development of a suitable cooling procedure was a particularly critical point. The functionality of the cryostat was demonstrated in a following experiment. The assumed advantages of superfluid helium instead of liquid helium at boiling temperature as target material were confirmed. A commissioning experiment at the QCLAM spectrometer was performed. By evaluating the spectrum of elastically scattered electrons, the target thickness could be measured experimentally. It agrees with the geometric manufacturer's specifications. During the experiment, the focusing of the electron beam on the target was difficult. Therefore, simulations on a modified target cell geometry with an increased target area were performed. |
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URN: | urn:nbn:de:tuda-tuprints-128111 | ||||
Classification DDC: | 500 Science and mathematics > 530 Physics | ||||
Divisions: | DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 1245: Nuclei: From Fundamental Interactions to Structure and Stars DFG-Graduiertenkollegs > Researcg Training Group 2128 Accelerator Science and Technology for Energy-Recovery Linacs 05 Department of Physics > Institute of Nuclear Physics > Experimentelle Kernphysik > Experimentelle Kernstruktur und S-DALINAC 05 Department of Physics > Institute of Nuclear Physics > Experimentelle Kernphysik > Elektronenstreuung, Wenig-Nukleon-Systeme 05 Department of Physics > Institute of Nuclear Physics > Experimentelle Kernphysik > Technische Kernphysik und Beschleunigerphysik |
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Date Deposited: | 06 Aug 2020 12:08 | ||||
Last Modified: | 01 Nov 2024 14:47 | ||||
URI: | https://tuprints.ulb.tu-darmstadt.de/id/eprint/12811 | ||||
PPN: | 468693092 | ||||
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