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WITCH Control System

Learn about the control system implementation, experimental requirements, hardware details, to-do list, and future outlook of the WITCH collaboration project. Discover the physics principles, experimental cycle, and hardware components used in this innovative research. Stay informed about the latest updates on the WITCH experiment.

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WITCH Control System

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  1. WITCHControl System Michaël Tandecki & The WITCH collaboration S. Van Gorp, E. Traykov , V. De Leebeeck, G. Soti, F. Wauters, N. Severijns (K.U.Leuven),M. Beck, P. Friedag, J. Mader, C. Weinheimer (Univ. Munster),F. Wenander, A. Herlert (ISOLDE-CERN) , F. Glück, V. Kozlov (FZK Karlsrühe),D. Zakoucky (NPI-Rez, Prague)

  2. Outline • WITCH: overview & status • Experimental requirements & hardware • CS implementation • To-do list • Conclusion & Outlook Michaël Tandecki – CS workshop – 19/02/2009

  3. Outline • WITCH: overview & status • Experimental requirements & hardware • CS implementation • To-do list • Conclusion & Outlook Michaël Tandecki – CS workshop – 19/02/2009

  4. Physics principle 1 b+ 0.8 0.6 b+ 0.4 0.2 ne ne 200 500 400 100 300 0 Recoil energy (eV) Hb = CV HV + CA HA + CS HS + CT HT + CP HP b-n correlation Scalar Vector V S e.g. Fermi +-decay Michaël Tandecki – CS workshop – 19/02/2009

  5. Penning traps B: radial confinement E: axial confinement Michaël Tandecki – CS workshop – 19/02/2009

  6. Retardation spectrometer Energy conversion Michaël Tandecki – CS workshop – 19/02/2009

  7. Location & overview ~7m WITCH: Weak Interaction Trap for Charged particles Michaël Tandecki – CS workshop – 19/02/2009

  8. Status of the experiment spectrometer potential (V) • First retardation spectrum (of 124In) obtained in Nov. 2006 • Run on 35Ar unveiled some new problems • Work was done to investigate these issues and perform the necessary upgrades • Nov 2009; second run on 35Ar which showed that all of the upgrades made were successful; low level ionization prevented us from measuring a clean retardation spectrum Michaël Tandecki – CS workshop – 19/02/2009

  9. Outline • WITCH: overview & status • Experimental requirements & hardware • CS implementation • To-do list • Conclusion & Outlook Michaël Tandecki – CS workshop – 19/02/2009

  10. Experimental cycle • Ejection trigger from REXTRAP • Beamgate is triggered for a TOF separation • PDT is triggered to pulse down the ions • Cooling cycle in the cooler trap • Transfer to decay trap • Ions are kept in the decay trap for the measurement • The DAQ system is allowed to count; retardation power supply and DAQ are synchronized (to have a correspondence between time and retardation voltage) • Ions are ejected downwards 0s ~ 100 ms ~ 1s ~ 5s Michaël Tandecki – CS workshop – 19/02/2009

  11. WITCH hardware • Vacuum • Pfeiffer TPG300 & TPG262 • ACT200 & ACT600 (for ATP400 & ATP900 Alcatel turbo pumps) • Electrode voltages • IKS custom-made (10 channels from -500 to 500V) • ISEG NHQ 234M (2 channels with higher precision – 4kV) • ISEG EHQ F020n (16 channels from 0 to -2kV) • ISEG CPx (separate modules that go to -10kV) Michaël Tandecki – CS workshop – 19/02/2009

  12. WITCH hardware • IKS vacuum interlock system • Traps • IKS Gate & delay generator (2 devices with each 20 channels) • IKS trap supply (32 channels, 4 steps between -15 & 15V) • IKS endcap supply (4 channels, switching between -20 & 450V) • Excitations (frequency generator) • Stanford Research Instruments DS345 • IKS RF switch Michaël Tandecki – CS workshop – 19/02/2009

  13. WITCH hardware: Gate & Delay Unit • Early replacement/back-up solution for the PPG100 card (and now permanent) • Advantages • flexible; experimental cycles (e.g. excitations) can be changed easily • Disadvantages • many cables needed • overview of the cycle can be lost Michaël Tandecki – CS workshop – 19/02/2009

  14. WITCH hardware • Spectrometer • IKS retardation voltage supply(in max. 40 steps from 0 to 500V) • Data-acquisition • WIENER (to read a CAMAC crate; QDC, TDC, scalar) • Ortec MCS-pci (counter with variable time bins) • Tektronix oscilloscope(s) • Keithley electrometer • Miscellaneous • Thermocouple read-out (Pico technology TC-08) • Cryostat resistors (for temperature indication) • Liquid levels • Magnets power supply • IKS cross-beam ion source power supply • Xantrax power supply (for 60kV ion source) Michaël Tandecki – CS workshop – 19/02/2009

  15. Outline • WITCH: overview & status • Experimental requirements & hardware • CS implementation • To-do list • Conclusion & Outlook Michaël Tandecki – CS workshop – 19/02/2009

  16. Situation (of programs) 2 years ago Separate controls for different devices, on different computers • HV control (with remote control via VI server) • Timing • Scan.GUI • Oscilloscope (Easy) operation of the system was only possible thanks to remote desktopping Michaël Tandecki – CS workshop – 19/02/2009

  17. Computer situation (physically) Computers Data-acquisition Pressure gauges Vacuum interlock power supplies VBL ‘Trap computer’ Trap electronics Remote control computer Power supplies for the HBL Michaël Tandecki – CS workshop – 19/02/2009

  18. Computer distribution/architecture WITCH internet Internet gateway+ GUIs WITCH DAQ Ortec & WIENER cards+ GUIs WITCH CS server DNS, DMS server, SQL server, slow monitoring (pressures, temperatures), data server CS data (object properties) DAQ data CS commands WITCH traps RS232 (USB): trap power supplies, timing unitGPIB: frequency generators, scope, electrometer WITCH slow controls RS232: pressure gauges, HV supplies CAN: HV supplies DEVICES CS device computers, slow controls Michaël Tandecki – CS workshop – 19/02/2009

  19. Interfaces: HV control Michaël Tandecki – CS workshop – 19/02/2009

  20. Interfaces: Trap Control (GADU) Michaël Tandecki – CS workshop – 19/02/2009

  21. Interfaces: Trap Control (electrodes) Under construction(but operational) Michaël Tandecki – CS workshop – 19/02/2009

  22. Interfaces: Scan.GUI Under construction(but operational) Michaël Tandecki – CS workshop – 19/02/2009

  23. Outline • WITCH: overview & status • Experimental requirements & hardware • CS implementation • To-do list • Conclusion & Outlook Michaël Tandecki – CS workshop – 19/02/2009

  24. To-do list • HV control • add the odd power supply (three electrodes remaining) • polish the instrument drivers • TrapControl; • Work on the interface for the trap electrodes • Implement an FPGA card? • Scan.GUI • Polish & finish it • Use data from CS when taking data (for logging purposes) • Start using the DSC engine • Tune the basics: CAN communication when restarting the system.. Michaël Tandecki – CS workshop – 19/02/2009

  25. Conclusion & Outlook • The most important thing for us: it is working • CS gives us more flexibility; every device can be easily accessed on every computer • Outlook • Finalizing some of the GUIs • Tune some drivers a bit more • I can tidy up (and make available) some CS classes (and drivers) if people need it. Michaël Tandecki – CS workshop – 19/02/2009

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