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On a Hydrogen Pellet Target for Antiproton Physics with PANDA
Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics.
2006 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The PANDA experiment is a part of the future FAIR accelerator facility and will study the strong interaction by detecting the reaction products from antiproton-proton annihilations in a near full solid-angle configuration. One option for the internal proton target in PANDA is frozen micro-spheres of hydrogen, so-called pellets.

Such a pellet target is interesting because of the unique characteristics it offers; the high target thickness, the small interaction volume, the minimal gas load on the vacuum system, and the possibility of tracking individual pellets. Nevertheless, it is possible to allocate the bulky equipment needed to produce the pellets at a few meters away from the beam. This way particle detectors can be located close and almost fully around the interaction point.

This thesis is devoted to the optimization of a pellet target. To perform measurements, a Pellet-Test Station was built at The Svedberg Laboratory, Uppsala. For the first time, experimental results show the pellet distribution in space and time, and in addition, the vacuum along the pellet pipes. Furthermore, dedicated measurements carried out at CELSIUS/WASA demonstrate the existence of pellet heating as a result of beam-target interactions.

In performing calculations, the potential problems with pellet heating at PANDA are outlined. Moreover, to look at the consequences for the desired physics, a reaction involving short-lived D-mesons has been used to show the advantages of pellets compared to a more spacious target.

In conclusion, these studies lead to a deeper understanding of the pellet properties, which makes it possible to suggest future improvements, such as cooling with no vibrations.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis , 2006. , 105 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 219
Keyword [en]
Nuclear physics, PANDA, Internal target, Pellet target, Beam-target interaction, Vacuum, Tracking, D-meson decay length
Keyword [sv]
Kärnfysik
Identifiers
URN: urn:nbn:se:uu:diva-7137ISBN: 91-554-6649-4 (print)OAI: oai:DiVA.org:uu-7137DiVA: diva2:168848
Public defence
2006-10-13, the Polhem lecture hall (10134), Ångström laboratory, Uppsala, 13:15
Opponent
Supervisors
Available from: 2006-09-21 Created: 2006-09-21Bibliographically approved
List of papers
1. On the behavior of micro-spheres in a hydrogen pellet target: ddd
Open this publication in new window or tab >>On the behavior of micro-spheres in a hydrogen pellet target: ddd
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2005 In: Nucl. Instr. and Meth.: Phys. Res. A, Vol. 546, 391-404 p.Article in journal (Refereed) Published
Identifiers
urn:nbn:se:uu:diva-94845 (URN)
Available from: 2006-09-21 Created: 2006-09-21Bibliographically approved
2. A high-density pellet target for antiproton physics with PANDA
Open this publication in new window or tab >>A high-density pellet target for antiproton physics with PANDA
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2005 In: Matter and Materials, ISSN 1433-5506, Vol. 30, 389-393 p.Article in journal (Refereed) Published
Identifiers
urn:nbn:se:uu:diva-94846 (URN)
Available from: 2006-09-21 Created: 2006-09-21Bibliographically approved
3. Tracked pellets - a way to improve the efficiency of charmonium studies
Open this publication in new window or tab >>Tracked pellets - a way to improve the efficiency of charmonium studies
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2006 (English)In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, ISSN 0168-9002, Vol. 568, no 2, 561-565 p.Article in journal (Refereed) Published
Abstract [en]

We investigate the possibility of tracking individual hydrogen micro-spheres from an internal pellet target. Such a method aims to provide the primary vertex of a reaction to within about 100 mu m, without utilizing any detector response. Apart from background considerations the knowledge of the reaction vertex may be essential for the reconstruction of many physics channels. This is in particular true for the study of the Psi(3770) decay into D-mesons planned at the PANDA detector at the future FAIR facility. Here, the reconstruction of displaced vertices is especially difficult since neutral particles are involved.Studies with a pellet target at The Svedberg Laboratory, Uppsala, show the technical feasibility of a tracking system utilizing fast CCD line-scan cameras. Simulations for the reaction pp -> Psi(3770) -> D+D- prove the large impact such a system would have on the data taking and reconstruction at PANDA.

Keyword
internal target, pellet target, displaced vertex reconstruction, tracking, D-meson decay length
National Category
Physical Sciences
Identifiers
urn:nbn:se:uu:diva-94847 (URN)10.1016/j.nima.2006.08.058 (DOI)000242822900009 ()
Available from: 2006-09-21 Created: 2006-09-21 Last updated: 2011-02-23Bibliographically approved
4. Can pellets be vaporized in beam-target interactions?
Open this publication in new window or tab >>Can pellets be vaporized in beam-target interactions?
In: Nucl. Instr. and Meth.: Phys. Res. AArticle in journal (Refereed) Submitted
Identifiers
urn:nbn:se:uu:diva-94848 (URN)
Available from: 2006-09-21 Created: 2006-09-21Bibliographically approved
5. Vacuum predictions and measurements for an internal pellet target
Open this publication in new window or tab >>Vacuum predictions and measurements for an internal pellet target
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Manuscript (Other academic)
Identifiers
urn:nbn:se:uu:diva-94849 (URN)
Available from: 2006-09-21 Created: 2006-09-21 Last updated: 2010-01-13Bibliographically approved

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