Research Overview

Type: Funded project / research cooperation

Time Frame: 2021-2028

Point of Contact: Alexander Matveenko

Department: BE-IA-SRBP

Device: Harmonic Cavities

Abstract:

The High Harmonic Cavity (HHC) developments at Helmholtz-Zentrum Berlin (HZB) is a pioneer project based on more than 20 years expertise in advanced RF technology, starting with the design of the BESSY II main RF cavities. HHC project covers the design, operation and integration of actively driven harmonic high order mode (HOM-) damped cavities into the high current storage rings.

Goals

• Enhanced Beam Performance – Enabling simultaneous storage of long and short electron bunches in the high current storage ring, explore the beam lifetime and stability performance.
• RF Technology – Development of new class of normal conducting RF cavities and related ancillaries with ultimate HOM-damping being essential for stable operation of the high current storage rings
• Integration in Storage Ring – development of individual technical & RF solutions given by hard space limitations of the storage rings.
• Collaboration & Innovation – A joint effort involving HZB and global research partners to advance the high-harmonic cavity technology and development of common standards for this class of cavities and related ancillaries – with the EU HOM-Damped Cavities representing a first major success.
  

Publications:

• F. Pérez, A. Matveenko, M. Ries, A. Tsakanian et al.: Active harmonic EU cavity: Commissioning and operation with beam, Nuclear Inst. and Methods in Physics Research, A 1072 (2025) 170195.
• F. Pérez, W. Anders, A. Matveenko, M. Ries, A. Tsakanian et al., 3HC- Third Harmonic Normal Conducting Active Cavity Collaboration between HZB, DESY and ALBA, Proc. of 13th Intern. Part. Accel. Conf. (IPAC’22), Bangkok, Thailand, 2022, pp. 1471-1474. Link
• E. Weihreter: Status of the European HOM Damped Normal Conducting Cavity, Proc. of Europ. Part. Accel. Conf. (EPAC’08), Genova, Italy, 2008, pp. 2932-2936. Link
• E. Weihreter, V. Dürr, F. Marhauser, A Ridged Circular Waveguide Ferrite Load for Cavity HOM Damping, Proc. of Europ. Part. Accel. Conf. (EPAC’06), Edinburgh, Scotland, 2006, pp. 1280-1282. Link
• W. Anders, P. Kuske, HOM Damped NC Passive Harmonic Cavities at BESSY, Proc. of Part. Accel. Conf. 2003, Portland, Oregon, USA, 2003, pp. 1186 -1188. Link
• P. vom Stein, M. Pekeler, H. Vogel, W. Anders, S. Belomestnykh, J. Knobloch, H. Padamsee, A Superconducting Landau Accelerator Module for BESSY II, Proc. of Part. Accel. Conf. 2001, Chicago, USA, 2001, pp. 1175 -1176. Link
• M. Georgsson, W. Anders, D. Krämer, J. M. Byrd, Design and commissioning of third harmonic cavities at BESSY II, Nuclear Inst. and Methods in Physics Research A 469, 2001, pp. 373-381.
• F. Marhauser, E. Weihreter et al, Numerical Simulations of a HOM Damped Cavity, Proc. of Europ. Part. Accel. Conf. (EPAC 2000), Vienna, Austria, 2000, pp. 1972-1974. Link

Innovate for Sustainable Accelerator Systems

 

Type: Funded Project

Supported by: HORIZON Europe

Time Frame: 2024 – 2027

Point of Contact: Axel Neumann

Department:  BE-IAS

Abstract:

Modern particle accelerators will always require a large amount of energy to operate. Keeping energy consumption as low as reasonable possible is an unavoidable challenge for both research infrastructures (RIs) and industry, which collectively operate over 40,000 accelerators. Based on state-of-the-art technology, the portfolio of current and future accelerator-driven RIs in Europe could develop to consume up to 1 % of Germany's annual electricity demand.

 

With the ambition to drastically improve the sustainability iSAS broadens, expedites and amplifies the development and impact of novel energy-saving technologies to accelerate particles. For many frontier accelerators superconducting RF (SRF) systems are the enabling technology. iSAS will innovate those technologies that have been identified as being a common core of SRF accelerating systems and that have the largest leverage for energy savings to minimize the intrinsic energy consumption in all phases of operation.

 

HZB/BE-IAS is one of the lead laboratories in iSAS and contributes to three key areas expected to significantly improve SRF accelerator operating efficiency: 

1. Development of  ferro-electric fast reactive tuners (FE-FRT) to actively and rapidly compensate microphonic detuning of narrow-bandwidth CW SRF cavities without the need for mechanical tuning.

2. Development of “intelligent” digital low-level RF systems for efficient control of the full SRF cavity system, including high-efficiency solid-state amplifiers and the FE-FRT system.

3. Development of Nb3Sn-on-Cu SRF cavities for 4.2 K operation (rather than ≤ 2 K) to for an enhanced cooling efficiency and reduced technical complexity of cryogenic plants.

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Type: Research Cooperation

Supported by: Universität der Bundeswehr München

Time Frame: 2023-2028

Point of Contact: Prof. Dr. Andrea Denker

Department:  BE-APT

Device: Zyklotron

 

At this innovative beamline it will be possible to perform groundbreaking pre-clinical research in particle therapy, which has the potential to revolutionize the application of particles in cancer therapy using new application techniques, such as the use of ultra short pulses in FLASH therapy or of tiny beamlets in particle minibeam therapy (PMBT). All this aims in the protection of healthy tissue and increased tumor control.

Rousseti, A.; Dollinger, G.; Neubauer, J.; Reindl, J.; Mayerhofer, M.; Dittwald, A.; Denker, A.; Kourkafas, G.; Bundesmann, J.: Current status of MINIBEE: minibeam beamline for preclinical experiments on spatial fractionation in the FLASH regime. In: Editorial Board: Fulvia Pilat ... [Ed.] : Proceedings of the 15th International Particle Accelerator Conference (IPAC'24) : Nashville, TN, 19-24 May 2024Genieve: JACoW, 2024. - ISBN 978-3-95450-24, p. THPR62/3663-3666
doi: 10.18429/JACoW-IPAC2024-THPR62

Rousseti, A.; Dollinger, G.; Mayerhofer, M.; Neubauer, J.; Reindl, J.; Bundesmann, J.; Denker, A.; Kourkafas, G.: Preclinical proton minibeam radiotherapy facility for small animal irradiation. In: Ralph Assmann [Ed.] : IPAC'23 : Proceedings of the 14th International Particle Accelerator Conference ; Venice, Italy from 7 to 12 May 2023Geneve: JACoW, 2023. - ISBN 978-3-95450-231-8, p. THPL043/1-3
doi: 10.18429/JACoW-IPAC2023-THPM065

Novel Accelerator Technology for Efficient LIght Sources

Type: Funded project

Supported by:  BMBF Verbundforschung: ErUM Pro

Time Frame:  2022 – 2025

Point of Contact:  Oliver Kugeler

Department:   BE-IAS

Abstract: 

NOVALIS aims at significantly reducing the operational power losses of superconducting radio-frequency (SRF) cavities, while also increasing the accelerating field to the range of 50-100MV/m, inaccessible with currently available resonators made from bulk Niobium (Nb). The envisaged performance increase will be achieved by coating the cavity’s inner surface with thin layers of new SRF materials capable of outperforming Nb, thus leading to higher fields and a lower surface resistance. The benefit of this approach will be twofold: First lower power losses would enable to increase the duty cycle of pulsed machines and allow for high-field continuous-wave operation with tolerable power losses, and second higher accelerating fields would increase the energy reach for existing machines and reduce the cost for novel light sources to be build. To characterize the suitability of superconductors for RF cavities, it is essential that the RF surface resistance is measured. HZB operates a very powerful system, the QPR, which can do so over an extensive parameter range. However, the tests are time consuming. To rapidly pre-select promising samples for in-depth characterization, a new system is being developed (RaSTA = Rapid Sample Testing Apparatus) which is fully compatible with the QPR.

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