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Department Accelerator Operation, Development and Technology

Accelerator Science and Technology Seminar


This event takes place in the following cycle:

Tuesdays, 14:00 - 15:00, every other week
(even calendar weeks - except during the summer holidays)


Format:

  • Language: English
  • Duration: 30-minutes, followed by a discussion (official end is 15:00)

Seminar Program 2024

Date Presenter Title OU
9 Jan Bettina Kuske "Design Strategies Towards A Lattice For BESSY III" BE-IA-ARD
20 Feb Alexander Schütt "Optimising the Non-Linear Kicker Injection using Reinforcement Learning"

BE-IA-SRBP

9 Apr

Sebastian Keckert

"Characterization of superconductors for SRF accelerators beyond the limits of niobium"

BE-IAS
23 Apr Jens Völker "Permanent magnet developments for next generation storage rings" BE-IA-ARD
7 May Frank Mayet & Florian Burkat "ARES: Past, Present, Future" DESY
28 May TBD    
18 Jun TBD    
2 Jul TBD    
16 Jul TBD    
10 Sep TBD    
24 Sep TBD    
8 Oct TBD    
12 Nov TBD    
26 Nov TBD    
10 Dec TBD    
21 Nov TBD    
5 Dec TBD    

 

Details

09.01.2024  - Bettina Kuske

Title:

"Design Strategies Towards A Lattice For BESSY III"

Abstract:

Lattice design is a bit like "looking for the needle in the haystack". We need to optimize many lattice properties, like the emittance, the momentum compaction factor, energy acceptance, dynamic aperture, lifetimes, circumference and the like, by varying many tens of magnet parameters and distances, multi-parameter optimization in a very high dimensional space. In the special case of modern Multi-bend Achromat lattices, HZB developed a deterministic approach to lattice design, that enables an understanding of the functionality of different lattice components. The successive set up of the linear lattice can help to prepare a good non-linear behavior. Different lattice options are compared and current aspects of the lattice development are discussed.

20.02.2024 - Alexander Schütt

Title:

"Optimising the Non-Linear Kicker Injection using Reinforcement Learning"

Abstract: 

Synchrotron light source storage rings aim to maintain a continuous beam current without observable beam motion during injection. One element that paves the way to this target is the non-linear kicker (NLK). The field distribution it generates poses challenges for optimising the topping-up operation.

Within this study, a reinforcement learning agent was developed and trained to optimise the NLK operation parameters. We present a brief introduction to reinforcement learning, the models employed, the optimisation process, and the achieved results.

 

09.04.2024  - Sebastian Keckert

Title:

"Characterization of superconductors for SRF accelerators beyond the limits of niobium"

Abstract:

Superconducting radio-frequency (SRF) cavities are a key component for various state-of-the-art particle accelerators. Typically, those cavities are made from niobium for which production techniques and surface treatments have been optimized over many years, providing performances close to the material’s fundamental limits. Thin film coatings are expected to enable operation beyond these limits, i.e. at higher temperature and potentially also at higher accelerating gradients. Especially when aiming for CW applications, the management of dynamic RF losses is crucial, which is closely connected to the quality factor, determined by the cavity’s shape and the material’s surface resistance. Hence, systematic studies on alternative materials and coating processes require measurements of the surface resistance on samples.

Operating a Quadrupole Resonator (QPR), HZB has a world-wide leading role in characterizing superconducting samples at radio frequencies. The QPR enables surface resistance measurements in a wide range of temperature, RF field and frequency along with studies of penetration depth and RF quench field. Recent developments of the sample chamber boosted the measurement accuracy considerably and enabled frequency-dependent studies of the residual resistance. Complementary to that, a simplified measurement device with high sample throughput (RaSTA) is currently under development. Combining those capabilities will enable iterative optimizations of coating processes for high performance SRF thin films.

23.04.2024  - Jens Völker

Title:

"Permanent magnet developments for next generation storage rings"

Abstract:

TBD

07.05.2024 - Frank Mayet & Florian Burkat

Title:

''ARES: Past, Present and Future''

Abstract: 
TBD

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Title:

 

Abstract: 



Archive:

Archive of previous talks