Design study for a 500 MeV positron beam at the Mainz Microtron MAMI
A design study has been performed for a positron beam with an energy of 500 MeV to be realized at the applied physics area of the Mainz Microtron MAMI. Positrons will be created after pair conversion of bremsstrahlung, produced by the 855 MeV electron beam at MAMI in a tungsten converter target. Fro...
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| Veröffentlicht in: | The European physical journal. D, Atomic, molecular, and optical physics Atomic, molecular, and optical physics, 2022-08, Vol.76 (8), Article 150 |
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| container_title | The European physical journal. D, Atomic, molecular, and optical physics |
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| creator | Backe, H. Lauth, W. Drexler, P. Heil, P. Klag, P. Ledroit, B. Stieler, F. |
| description | A design study has been performed for a positron beam with an energy of 500 MeV to be realized at the applied physics area of the Mainz Microtron MAMI. Positrons will be created after pair conversion of bremsstrahlung, produced by the 855 MeV electron beam at MAMI in a tungsten converter target. From the two conceivable geometries (1) pair conversion in the bremsstrahlung converter target itself, and (2) bremsstrahlung pair conversion in a separated lead foil, the former was considered in detail. Positrons will be energy selected within an outside open electron beam-line bending magnet, and bent back by an additional sector magnet. Magnetic focusing elements in between are designed to prepare in a well shielded positron target chamber about 6 m away from the target a beam with horizontal and vertical emittances of
ϵ
v
= 0.055
π
mm mrad (1
σ
), and
ϵ
h
=
0.12
π
mm mrad (1
σ
), respectively, for a 10
μ
m thick amorphous tungsten target and negligible momentum spread. At an accepted positron band width of 1 MeV, spots are expected vertically with an angular spread of 0.064 mrad and a size of 5.0 mm (FWHM), and horizontally with an angular spread of 0.64 mrad and a size of 7.7 mm (FWHM). The positron yield amounts to 13.1 per second, 1 MeV positron energy band width, and 1 nA electron beam current.
Graphic abstract |
| doi_str_mv | 10.1140/epjd/s10053-022-00465-9 |
| format | Article |
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ϵ
v
= 0.055
π
mm mrad (1
σ
), and
ϵ
h
=
0.12
π
mm mrad (1
σ
), respectively, for a 10
μ
m thick amorphous tungsten target and negligible momentum spread. At an accepted positron band width of 1 MeV, spots are expected vertically with an angular spread of 0.064 mrad and a size of 5.0 mm (FWHM), and horizontally with an angular spread of 0.64 mrad and a size of 7.7 mm (FWHM). The positron yield amounts to 13.1 per second, 1 MeV positron energy band width, and 1 nA electron beam current.
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ϵ
v
= 0.055
π
mm mrad (1
σ
), and
ϵ
h
=
0.12
π
mm mrad (1
σ
), respectively, for a 10
μ
m thick amorphous tungsten target and negligible momentum spread. At an accepted positron band width of 1 MeV, spots are expected vertically with an angular spread of 0.064 mrad and a size of 5.0 mm (FWHM), and horizontally with an angular spread of 0.64 mrad and a size of 7.7 mm (FWHM). The positron yield amounts to 13.1 per second, 1 MeV positron energy band width, and 1 nA electron beam current.
Graphic abstract</description><subject>Applications of Nonlinear Dynamics and Chaos Theory</subject><subject>Atomic</subject><subject>Bremsstrahlung</subject><subject>Conversion</subject><subject>Dynamics of Systems on the Nanoscale</subject><subject>Electron beams</subject><subject>Energy bands</subject><subject>Foils</subject><subject>Molecular</subject><subject>Optical and Plasma Physics</subject><subject>Physical Chemistry</subject><subject>Physics</subject><subject>Physics and Astronomy</subject><subject>Positron beams</subject><subject>Positrons</subject><subject>Quantum Information Technology</subject><subject>Quantum Physics</subject><subject>Regular Article – Atomic and Molecular Collisions</subject><subject>Spectroscopy/Spectrometry</subject><subject>Spintronics</subject><subject>Tungsten</subject><issn>1434-6060</issn><issn>1434-6079</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2022</creationdate><recordtype>article</recordtype><sourceid>C6C</sourceid><recordid>eNqFkE1PwzAMhiMEEmPwG4jEucxN0qQ5Thsfk6i4ANcoaZ3RibUl6Q7j19OtCI6cbMnvY1sPIdcp3KapgBl2m2oWU4CMJ8BYAiBklugTMkkFF4kEpU9_ewnn5CLGDQCwTMgJWS4x1uuGxn5X7alvA7U0A6AFvtGujXUf2oY6tFtqe9q_Iy1s3XzRoi5De5wV82J1Sc68_Yh49VOn5PX-7mXxmDw9P6wW86ek5DnvE205eMk050K7tBQKPZeQAfeVwhydrZwGl3uwUnmrKu54jlg68E5kAis-JTfj3i60nzuMvdm0u9AMJw1ToBhTmoshpcbU8GKMAb3pQr21YW9SMAdl5qDMjMrMoMwclRk9kPlIxoFo1hj-9v-HfgMz33D3</recordid><startdate>20220801</startdate><enddate>20220801</enddate><creator>Backe, H.</creator><creator>Lauth, W.</creator><creator>Drexler, P.</creator><creator>Heil, P.</creator><creator>Klag, P.</creator><creator>Ledroit, B.</creator><creator>Stieler, F.</creator><general>Springer Berlin Heidelberg</general><general>Springer Nature B.V</general><scope>C6C</scope><scope>AAYXX</scope><scope>CITATION</scope><orcidid>https://orcid.org/0000-0001-5935-4047</orcidid></search><sort><creationdate>20220801</creationdate><title>Design study for a 500 MeV positron beam at the Mainz Microtron MAMI</title><author>Backe, H. ; Lauth, W. ; Drexler, P. ; Heil, P. ; Klag, P. ; Ledroit, B. ; Stieler, F.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c383t-9a30f6293349b1c47ef360503fd7e8ebadb90b8f0a67fa7d3b38eecb0fb454ed3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2022</creationdate><topic>Applications of Nonlinear Dynamics and Chaos Theory</topic><topic>Atomic</topic><topic>Bremsstrahlung</topic><topic>Conversion</topic><topic>Dynamics of Systems on the Nanoscale</topic><topic>Electron beams</topic><topic>Energy bands</topic><topic>Foils</topic><topic>Molecular</topic><topic>Optical and Plasma Physics</topic><topic>Physical Chemistry</topic><topic>Physics</topic><topic>Physics and Astronomy</topic><topic>Positron beams</topic><topic>Positrons</topic><topic>Quantum Information Technology</topic><topic>Quantum Physics</topic><topic>Regular Article – Atomic and Molecular Collisions</topic><topic>Spectroscopy/Spectrometry</topic><topic>Spintronics</topic><topic>Tungsten</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Backe, H.</creatorcontrib><creatorcontrib>Lauth, W.</creatorcontrib><creatorcontrib>Drexler, P.</creatorcontrib><creatorcontrib>Heil, P.</creatorcontrib><creatorcontrib>Klag, P.</creatorcontrib><creatorcontrib>Ledroit, B.</creatorcontrib><creatorcontrib>Stieler, F.</creatorcontrib><collection>Springer Nature OA Free Journals</collection><collection>CrossRef</collection><jtitle>The European physical journal. D, Atomic, molecular, and optical physics</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Backe, H.</au><au>Lauth, W.</au><au>Drexler, P.</au><au>Heil, P.</au><au>Klag, P.</au><au>Ledroit, B.</au><au>Stieler, F.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Design study for a 500 MeV positron beam at the Mainz Microtron MAMI</atitle><jtitle>The European physical journal. D, Atomic, molecular, and optical physics</jtitle><stitle>Eur. Phys. J. D</stitle><date>2022-08-01</date><risdate>2022</risdate><volume>76</volume><issue>8</issue><artnum>150</artnum><issn>1434-6060</issn><eissn>1434-6079</eissn><abstract>A design study has been performed for a positron beam with an energy of 500 MeV to be realized at the applied physics area of the Mainz Microtron MAMI. Positrons will be created after pair conversion of bremsstrahlung, produced by the 855 MeV electron beam at MAMI in a tungsten converter target. From the two conceivable geometries (1) pair conversion in the bremsstrahlung converter target itself, and (2) bremsstrahlung pair conversion in a separated lead foil, the former was considered in detail. Positrons will be energy selected within an outside open electron beam-line bending magnet, and bent back by an additional sector magnet. Magnetic focusing elements in between are designed to prepare in a well shielded positron target chamber about 6 m away from the target a beam with horizontal and vertical emittances of
ϵ
v
= 0.055
π
mm mrad (1
σ
), and
ϵ
h
=
0.12
π
mm mrad (1
σ
), respectively, for a 10
μ
m thick amorphous tungsten target and negligible momentum spread. At an accepted positron band width of 1 MeV, spots are expected vertically with an angular spread of 0.064 mrad and a size of 5.0 mm (FWHM), and horizontally with an angular spread of 0.64 mrad and a size of 7.7 mm (FWHM). The positron yield amounts to 13.1 per second, 1 MeV positron energy band width, and 1 nA electron beam current.
Graphic abstract</abstract><cop>Berlin/Heidelberg</cop><pub>Springer Berlin Heidelberg</pub><doi>10.1140/epjd/s10053-022-00465-9</doi><orcidid>https://orcid.org/0000-0001-5935-4047</orcidid><oa>free_for_read</oa></addata></record> |
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| subjects | Applications of Nonlinear Dynamics and Chaos Theory Atomic Bremsstrahlung Conversion Dynamics of Systems on the Nanoscale Electron beams Energy bands Foils Molecular Optical and Plasma Physics Physical Chemistry Physics Physics and Astronomy Positron beams Positrons Quantum Information Technology Quantum Physics Regular Article – Atomic and Molecular Collisions Spectroscopy/Spectrometry Spintronics Tungsten |
| title | Design study for a 500 MeV positron beam at the Mainz Microtron MAMI |
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