Name: PULsed POwer for Kicker Systems (PULPOKS) workshop 2023
Start: 2023-04-24T09:00:00+02:00
End: 2023-04-26T14:30:00+02:00
Location: DESY

Monday, 24 April
- Welcome
  
  20230424_ALBA_Synchrotron_team.pdf
  
  2023 PULPOKS Workshop - Univ Pau Introduction - Anton GUSEV.pdf
  
  230419_PulPoKS23_DESY_KickerLabGroup.pdf
  
  CERN_Participants_PULPOKS_2023.pdf
  
  CERN_Participants_PULPOKS_2023.pptx
  
  ESRF_pulpoks_2023_2.pdf
  
  Introduction_HZB_Pulse_Power_Team_PULPOKS23-1.pdf
  
  PSI crew.pdf
  
  PulPOKS23-Abteilung_RHV_Vorstellung_Petzenhauser.pdf
  
  SOLEIL 1 minute 1 slide.pdf
  
  UKRI ISIS Introduction.pdf
- Welcome: Group introductions (4-5min slides)
  
  20230424_ALBA_Synchrotron_team.pdf
  
  2023 PULPOKS Workshop - Univ Pau Introduction - Anton GUSEV.pdf
  
  230419_PulPoKS23_DESY_KickerLabGroup.pdf
  
  CERN_Participants_PULPOKS_2023.pdf
  
  CERN_Participants_PULPOKS_2023.pptx
  
  ESRF_pulpoks_2023_2.pdf
  
  Introduction_HZB_Pulse_Power_Team_PULPOKS23-1.pdf
  
  PSI crew.pdf
  
  PulPOKS23-Abteilung_RHV_Vorstellung_Petzenhauser.pdf
  
  SOLEIL 1 minute 1 slide.pdf
  
  UKRI ISIS Introduction.pdf
- 11:00
  
  Coffee break
- Poster Sessions in Coffee Breaks
  
  20230419_PLengua_Poster_Pulpoks.pdf
  
  Enhancement_Septum_Pulser_Poster_PULPOKS2023.pdf
  
  MMartin - ISIS Extract Kicker Replacement.pdf
  
  poster_pulpoks_2023_printable_last.pdf
  
  PULPOKS_2023_CERN Electrical contacts.pdf
  
  Pulpoks 2023 Marx 20-4-23.pdf
  
  PulPoKS23_poster_J-Ruf_M-J-Barnes_T-Kramer_M-Sack.pdf
  
  Pulse_Current_Interlock_BESSYII_SR_Kickers_Poster_PULPOKS2023.pdf
- Morning session
  - 1
    
    Development work on Pulsed 35kV Electrostatic Chopper with 10ns Rise Times
    
    This presentation will give an overview of the development work at ISIS neutron and muon source, STFC on the Super MuSR project. This project is an upgrade to the existing MuSR instrument at ISIS, which will lead to an improved time resolution and counting rate. An emphasis will be placed on the electrostatic chopper which will produce a ±35kV voltage reversal within 10ns, flipping the electric field on the beam. Topics of discussion: testing of prototype pulse power supplies and design work on the coax line and vacuum feedthroughs.
    
    Speaker: Maliq Martin (ISIS neutron and muon source, STFC)
    
    Development work on pulsed 35kV electrostatic chopper with 10ns rise times.pdf
  - 2
    
    Status of the SIS100 kicker magnet systems
    
    Speaker: Isfried Petzenhauser (GSI Helmholtzzentrum fuer Schwerionenforschung)
    
    PulPOKS23_Petzenhauser.pdf
  - 3
    
    A Double Dipole Kicker for ALBA II
    
    Facing ALBA II upgrade needs, a novel pulsed magnet named Double Dipole Kicker (DDK) has been designed and it is being prototyped, with the aim to generate a multipole field for off-axis injection, whose proof-of-principle will be tested first at the ALBA storage ring. The resulting magnetic field is the superposition of two opposite dipoles, generated by four inner and four outer conductor rods. On-axis injection can as well be provided by switching off the inner rods, which create a pure dipole field. To maximize the kick efficiency and minimize disturbances on the stored beam inner and outer rods will be powered independently with two pulsed power supplies. In addition, a sophisticated coating layer will be applied to the ceramic surface in order to minimize the eddy current’s effect while keeping the impedance optimized. Details of the DDK design and the status of the prototype will be presented.
    
    Speaker: Raquel Munoz Horta
    
    20230424_PULPOKS_The_ALBA_DDK_RM_final.pdf
- 13:00
  
  Lunch & group photo
- Afternoon session
  - 4
    
    Pulse Current Analysis at BESSY II
    
    At BESSY II fast pulsed magnets are used for injection and extraction
    processes. Originally, pulse current measurement systems for all pulsed
    elements were set up in the framework of BESSY II top-up operation to
    show that the required level of voltage stability was achieved. Now it
    is essential for stable user operation at high average injection
    efficiencies of about 98 %. A model based on a simplified replacement
    circuit diagram was applied. The implementation of this pulse current
    analysis program in the BESSY II control system now enables online data
    evaluation of physical parameters of pulsed elements as well as higher
    statistical quality of phenomenological quantities during continuous
    BESSY II user operation.
    
    Speaker: Anny Gora (Helmholtz-Zentrum Berlin HZB)
    
    Pulse Current Analysis at BESSY II - Pulpoks23.pdf
  - 5
    
    Failure statistics and availability improvement of kicker systems at DESY
    
    In the various circular and linear accelerators at DESY and European XFEL a total number of ca. 100 kicker systems is being operated.
    In recent years, a failure monitoring has been introduced for these systems to systematically study reasons for system failures and track down failure sources.
    In this talk we will discuss the failure statistics collected up to now and review the kicker availability at DESY.
    We will also comment on our experience with radiation-induced failures of commercial semiconductor switches and how this could be mitigated.
    
    Speaker: Lukas Teichgraeber (DESY)
    
    2023 PULPOKS Kicker Reliability .pdf
- 15:30
  
  Coffee break
- Afternoon session
  - 6
    
    A stacked MOsFET-switch for distribution of bunch trains at 4.5 MHz
    
    Speaker: Mr Lukas Teichgraeber (DESY)
    
    2023 PulPoKS Nanosecond Dump Pulser.pdf
  - 7
    
    Optimization of beam impedance mitigation measured for HV reliability in an SPS injection kicker
    
    The SPS injection kicker magnets (MKP) were developed in the 1970’s, before beam induced power deposition in the ferrite yoke was considered an issue. These magnets are very lossy from a beam impedance perspective which limits SPS operation, e.g. with the higher intensity beams needed for HL-LHC. An upgraded design, with serigraphy applied to alumina U-chambers, has been developed to significantly reduce the broadband beam coupling impedance and thus the beam induced heating. During high voltage pulse testing there were electrical discharges associated with the serigraphy. We discuss the solutions implemented to mitigate the discharges while maintaining an adequately low beam-coupling impedance. The upgraded magnet has been installed in the SPS: the initial results of operation with beam are presented.
    
    Speaker: Mike Barnes (CERN)
    
    PulPoKS_MKPL_shielding_24042023.pdf
    
    PulPoKS_MKPL_shielding_24042023.pptx
Tuesday, 25 April
- Morning session
  - 8
    
    Nanosecond Pulse Power Systems for TEM Kickers at SLAC
    
    Speaker: Anatoly Krasnykh (SLAC)
    
    PulPoKS23 DESY-2.pdf
  - 9
    
    A High-Voltage Nanosecond Opening Switch Based on TVS Diodes
    
    Speaker: Anton Gusev
    
    2023 PULPOKS Workshop - Anton GUSEV.pdf
  - 10
    
    A 2.5kA modulator for the European XFEL injector
    
    Speaker: Joachim Kahl (DESY)
    
    EN A 2.5kA modulator for the European XFEL injector.pdf
- 10:30
  
  Coffee break (& Hostel check-out)
- Morning session
  - 11
    
    Electrostatic Kicker at 37kHz and +/-10kV for Muons
    
    Selection of single muons is needed for two experiments at PSI. Four +/- 5kV Switches in a bridge configuration provide a +/-10kV potential for switching muons at a 37kHz rate. A successful system was developed and in operation for 20 years. It relies on a flow of FC77 coolant directly on the transistors in the HV switch to remove ca. 1kW of heat. Unfortunately, the switches were destroyed by a water leak into the coolant. This presentation gives the detailed redesign of the replacement switches.
    
    Speaker: Chris Gough (Paul Scherrer Institut)
    
    2023-04-25 MORE Kicker for PULPOKS V2.pdf
  - 12
    
    A Solid State Marx Generator for driving kicker magnets
    
    Speaker: Martin Sack (KIT Karlsruhe)
    
    PulPoKS-Workshop-23-5_MSack.pdf
- 13:00
  
  Lunch
- Afternoon session
  - 13
    
    Design of a new Multipole Injection Kicker (MIK)
    
    Top-Up injection in the new SOLEIL II storage ring is planned to use an off-axis on-momentum betatron scheme. The final kick on the injected beam into the small dynamic aperture is given by a non linear kicker or MIK. To ensure the quality and transparency of the injection, the peak magnetic field generated by the MIK must be located at 3.5 mm from the stored beam axis while the zero-field region around the stored beam should be of octupolar type. The MAXIV type MIK developed by SOLEIL in the previous years could not be reused as placing the peak field at 3.5 mm by shrinking the 8-conductor design would lead to a roughly 1 mm aperture for the beams, impracticable for use in a storage ring. Therefore, the SOLEIL pulsed magnet team had to design a new MIK topology from scratch to achieve the required magnetic field distribution, while providing a sufficient aperture for the beams. The presentation focuses on the challenges that were met in defining new suitable topologies, pulsed operation in vacuum, mechanical & thermal design of the magnet as well as the titanium coating effects on the pulsed magnetic field distribution.
    
    Speaker: Patrick Alexandre (Soleil)
  - 14
    
    New BESSY Booster Solid State Kicker Pulser Power Supplies
    
    The BESSY booster kicker magnets have been powered with PFL type kicker pulsers since the BESSY II project was accomplished successfully. The kicker pulsers systems were realized with floating switch topologies applying CX 1154 thyratrons. After more than 25 years of operations the applied thyratron based kicker pulser units show wear and tear. The used pulser technology has obstacles for the operations of modern 4th generation light sources that should be overcome.
    The plan is to replace the existing technology with the help of solid-state Marx generator units. Therefore, a BESSY II booster kicker pulser renewal project has been launched.
    The talk is about the basic idea of replacing the thyratron switch technology, wherever possible, will explain the experience with the existing equipment and tell about technological limitations in applying solid state switches. To conclude, the status of the project will be described.
    
    Speaker: Olaf Dressler (Helmholtz-Zentrum Berlin)
    
    Solid_State_BESSY_KPuls_PULPOKS23-1.pdf
- 15:30
  
  Coffee break
- Afternoon session
  - 15
    
    Development of fast kicker prototype for SLS 2.0 advanced injection schemes
    
    Swiss Light Source plans an upgrade to turn its existing Storage Ring (SR) into a modern diffraction limited light source (SLS 2.0). A 4-kicker bump scheme with new thick and thin septum will ensure the conventional injection in the smaller aperture of the new SR. To reduce further the perturbation of the stored beam during top-up, two new injection schemes are developed: “Fast” and “Super-fast”. The “Fast” injection should be able to ensure single-bunch off-axis injection affecting only 10 to 20 SR bunches (SR bunch spacing is 2 ns) in so called Aperture Sharing (AS) mode. The “Super-fast” one should utilize single-bunch off-axis injection affecting only one SR bunch (AS mode) or, in the future, on-axis injection between two SR bunches. To realize these injection schemes an extremely fast kicker system is required to provide deflection duration of about 30 ns for the “Fast” scheme and less than 2 ns for the “Super-fast” one. For practical reasons we decided to design a stripline kicker capable of 2 ns second deflection duration, given that if this is achieved, the same kicker can produce longer deflection durations when excited with longer electrical pulses. To prove the concept a prototype stripline kicker is being designed. We will present the status of its development and will discuss some of the critical aspects of such design.
    
    Speaker: Dr Martin Paraliev (Paul Scherrer Institute)
    
    2023_04_25_SLS2_FastKicker_PulPoKS23.pdf
  - 16
    
    Stripline kickers for top-up injection into PETRA IV
    
    Speaker: Gregor Loisch
    
    230418_Piv_striplines_PulPoKS23_GL.pdf
- 18:00
  
  Workshop dinner
Wednesday, 26 April
- 10:00
  
  Coffee Break/Feedback/Tour group formation
- Facility tour
- 13:00
  
  Lunch DESY cantine
  
  DESY cantine

PULsed POwer for Kicker Systems (PULPOKS) workshop 2023

DESY

DESY cantine