Accelerator Physics

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2023-01-27
12:14

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2023-01-25
19:42
[GSI-2023-00278] Dissertation / PhD Thesis
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Multipass beam breakup instability countermeasures in energy recovery linacs
TU Darmstadt 127 p. () [10.26083/TUPRINTS-00022915] = Dissertation, TU Darmstadt, 2022
The multipass regenerative multibunch beam breakup instability is specific to recirculating linacs (linear accelerators) and energy recovery linacs operating in continuous wave mode where particle bunches pass multiple times through the same superconducting RF cavities with extremely high quality factor. Parasitic electromagnetic modes excited in the cavities can affect bunch dynamics in such a way, that on its subsequent passes it excites the modes further and a positive feedback loop is formed. [...]

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2023-01-06
09:32

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2022-02-14
23:17

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2021-10-14
17:47
arXiv [GSI-2021-01126] Book/Internal Report

Absence of Structure Resonances in SIS100 Tune Quadrant for Heavy Ion Fast Extraction
[ ; arXiv:2204.06435]
9 p ()
The understanding and avoidance of space charge induced resonances is of utmost importance for long storage times in synchrotrons, as they can lead to halo generation and subsequent beam loss. This report discusses the absence of structure resonances for heavy-ion operation in SIS100 in the tune quadrant foreseen for the fast extraction mode, 18.5 < Qx,y < 19 . [...]
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2021-05-06
12:49

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2021-03-04
15:14
arXiv [GSI-2021-00450] Book/Internal Report

Impact of Field Errors of Quadrupole Units on Beam Losses at SIS100 Injection
[arXiv:2204.06441]
9 p ()
This report discusses heavy-ion beam losses due to the nominal transverse space charge and the field imperfections in SIS100 during accumulation based on recent cold measurements of the first 10 series quadrupole units. They are compared to the (stamped) First-of-Series quadrupole unit #2..
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2021-01-20
09:12

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2020-12-02
12:05
OpenAccess [GSI-2020-01299] Journal Article
; ; ; et al
Beam quality and beam loss predictions with space charge for SIS100
The SIS100 synchrotron as a part of the new FAIR accelerator facility at GSI should be operated at the "space charge limit" for light and heavy-ion beams. Losses due to space charge induced resonance crossing should not exceed a few percent during a full cycle. [...]
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2020-12-02
12:01

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