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The PANDA electromagnetic calorimeter at photon energies below 100 MeV
Stockholm University, Faculty of Science, Department of Physics.
2020 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The PANDA  experiment (antiproton annihilation at Darmstadt) is designed for studies of the strong force in the transition region between perturbative and non-perturbative quantum chromo dynamics (QCD). It will be built and placed at the high-energy storage ring, HESR, at FAIR (Facility for antiproton and ion research) in Darmstadt and start its first experiments in 2025. In the HESR antiprotons with a momentum in the range 1.5 GeV/c to 15 GeV/c will collide with a fixed hydrogen or nuclear target. The PANDA detector is designed for e.g. detailed spectroscopy of hadrons produced in antiproton-proton interactions. In 2026 PANDA will be upgraded with the implementation and completion of some subdetectors, e.g. the EDD (end disc detector of internal reflected Cherenkov light) for charged particle velocity measurements in the forward direction.

This thesis summarizes preparatory experiments with a PANDA forward endcap electromagnetic calorimeter (EMC) prototype, performed at the tagged photon facility at the MAX IV laboratory in Lund to study the response to photons with energies below 100 MeV using vacuum photo tetrodes (VPTTs) as photo sensors. The results show that with VPTT photo sensors, in combination with sampling ADCs, the technical design report (TDR) requirement, with regard to energy resolution, can be fulfilled even for energies below 100 MeV. It is also shown that the energy resolution is not significantly influenced by the insertion of the EDD in front of the forward endcap EMC.

Place, publisher, year, edition, pages
Stockholm: Department of Physics, Stockholm University , 2020.
Keywords [en]
PANDA, vacuum photo tetrodes, electromagnetic calorimeter
National Category
Accelerator Physics and Instrumentation
Research subject
Physics
Identifiers
URN: urn:nbn:se:su:diva-179384ISBN: 978-91-7911-046-8 (print)ISBN: 978-91-7911-047-5 (electronic)OAI: oai:DiVA.org:su-179384DiVA, id: diva2:1396767
Public defence
2020-04-08, sal FB55, AlbaNova universitetscentrum, Roslagstullsbacken 21, Stockholm, 09:00 (English)
Opponent
Supervisors
Note

At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 1: Manuscript. Paper 2: Manuscript.

Available from: 2020-03-16 Created: 2020-02-26 Last updated: 2020-03-06Bibliographically approved
List of papers
1. Photon calorimetry below 100 MeV at PANDA using vacuum phototetrodes as photo sensor
Open this publication in new window or tab >>Photon calorimetry below 100 MeV at PANDA using vacuum phototetrodes as photo sensor
(English)Manuscript (preprint) (Other academic)
Abstract [en]

We have investigated the photon response of the PANDA forward endcap electromagnetic calorimeteras a function of photon energy in the range 13 MeV - 99 MeV and as a function of hit position onthe calorimeter surface, using vacuum photo tetrodes (VPTT) as photo sensors for the lead tungstate(PWO) scintillators. The measurements were carried out at the tagged photon facility MAX IV inLund, employing an EMC prototype equipped with (4X4) PWO scintillators.The study shows that the relative energy resolution is 7 % at 93 MeV and 22 % at 13 MeV,for photons hitting close to the center of a scintillator, and slightly worse for photons hitting close tothe boundary between scintillators.

National Category
Accelerator Physics and Instrumentation
Research subject
Physics
Identifiers
urn:nbn:se:su:diva-179382 (URN)
Available from: 2020-02-26 Created: 2020-02-26 Last updated: 2020-02-26Bibliographically approved
2. The PANDA electromagnetic calorimeter - Influence of the DIRC detector EDD for photon energies below100 MeV
Open this publication in new window or tab >>The PANDA electromagnetic calorimeter - Influence of the DIRC detector EDD for photon energies below100 MeV
(English)Manuscript (preprint) (Other academic)
Abstract [en]

In this work the influence of the DIRC (detection of internal reected Cherenkov light) detector of PANDA (antiproton annihilation at Darmstadt) on the photon response of the forward endcap electromagnetic calorimeter (EMC) for photon energies between 14 MeV and 97 MeV, is studied. Measurements were conducted at the tagged photon facility MAX IV in Lund using an EMC prototype equipped with 3X3 PWO scintillator crystals.The study shows that the DIRC detector will affect the energy resolution for photonenergies below 100 MeV, but under realistic experimental conditions the effect is expected to be negligible.

National Category
Accelerator Physics and Instrumentation
Research subject
Physics
Identifiers
urn:nbn:se:su:diva-179383 (URN)
Available from: 2020-02-26 Created: 2020-02-26 Last updated: 2020-02-26Bibliographically approved

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