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The VEPP-4M Collider Operation in the Experiment of Precise Tau-lepton Mass Measurement

Budker Institute of Nuclear Physics, Novosibirsk The VEPP-4M lab http://v4.inp.nsk.su. BINP Novosibirsk. The VEPP-4M Collider Operation in the Experiment of Precise Tau-lepton Mass Measurement. V. Smaluk, for the VEPP-4 team. 6-th International Workshop on Accelerator Operations

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The VEPP-4M Collider Operation in the Experiment of Precise Tau-lepton Mass Measurement

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  1. Budker Institute of Nuclear Physics, Novosibirsk The VEPP-4M lab http://v4.inp.nsk.su BINPNovosibirsk The VEPP-4M Collider Operationin the Experiment of Precise Tau-lepton Mass Measurement V. Smaluk, for the VEPP-4 team 6-th International Workshop on Accelerator Operations Trieste, 24-28 September 2007

  2. The VEPP-4M Collider Operation in the Experiment of Precise Tau-lepton Mass Measurement BINPNovosibirsk http://v4.inp.nsk.su Contents The VEPP-4 accelerating-storage complex High-energy physics experiments Operation time distribution Failure analysis Working cycle automation Performance improvement 6-th International Workshop on Accelerator Operations, Trieste, 24-28 September 2007

  3. The VEPP-4M Collider Operation in the Experiment of Precise Tau-lepton Mass Measurement BINPNovosibirsk The VEPP-4 accelerating-storage complex 6-th International Workshop on Accelerator Operations, Trieste, 24-28 September 2007

  4. The VEPP-4M Collider Operation in the Experiment of Precise Tau-lepton Mass Measurement BINPNovosibirsk http://v4.inp.nsk.su The VEPP-4 accelerating-storage complex 6-th International Workshop on Accelerator Operations, Trieste, 24-28 September 2007

  5. The VEPP-4M Collider Operation in the Experiment of Precise Tau-lepton Mass Measurement BINPNovosibirsk http://v4.inp.nsk.su High-energy physics:t-lepton mass measurement Precise measurement of the t-lepton mass at the producing threshold is the principal high-energy physics experiment at the VEPP-4 accelerating-storage complex. Exact value of the t-lepton mass is required to verify the lepton universality principle which is one of the postulates of the Standard Model, the most complete theory describing fundamental properties of matter. At present, measurement accuracy reached in this experiment is the best in the world. http://kedr.inp.nsk.su 6-th International Workshop on Accelerator Operations, Trieste, 24-28 September 2007

  6. The VEPP-4M Collider Operation in the Experiment of Precise Tau-lepton Mass Measurement BINPNovosibirsk http://v4.inp.nsk.su High-energy physics: y(2s) and y(3770) 3 times improved 2 times improved Precise measurements of the y-family meson masses provide the energy scale in the range around 3 GeV which is a basis for accurate determination of masses for all charmed particles. There are only 5 masses (e, p, n, m, p) measured with higher accuracy http://kedr.inp.nsk.su 6-th International Workshop on Accelerator Operations, Trieste, 24-28 September 2007

  7. The VEPP-4M Collider Operation in the Experiment of Precise Tau-lepton Mass Measurement BINPNovosibirsk http://v4.inp.nsk.su Compton back-scattering – routine energy monitoring during HEP experiment runs Beam energy measurement Resonant depolarization – high-precision periodic calibration Measurement accuracy 6-th International Workshop on Accelerator Operations, Trieste, 24-28 September 2007

  8. The VEPP-4M Collider Operation in the Experiment of Precise Tau-lepton Mass Measurement BINPNovosibirsk http://v4.inp.nsk.su Synchrotron radiation experiments VEPP-3 SR channels and stations 0a – LIGA-technology and X-ray lithography 0b – “Explosion" 2 –Precisiondiffractometry and anomalous scattering 3 – X-ray fluorescence analysis 4 –High-pressure diffractometry 5a– X-ray microscopy and micro-tomography 5b – Time-resolutiondiffractometry 5c – Small-angle X-ray scattering 6 – Time-resolution luminescence 7 –SR beam stabilization 8 –EXAFS spectroscopy 10 –Metrology and EXAFS spectroscopy in soft X-ray band http://ssrc.inp.nsk.su 6-th International Workshop on Accelerator Operations, Trieste, 24-28 September 2007

  9. The VEPP-4M Collider Operation in the Experiment of Precise Tau-lepton Mass Measurement BINPNovosibirsk http://v4.inp.nsk.su Distribution of the operation time 2004 - 2006 6-th International Workshop on Accelerator Operations, Trieste, 24-28 September 2007

  10. The VEPP-4M Collider Operation in the Experiment of Precise Tau-lepton Mass Measurement BINPNovosibirsk http://v4.inp.nsk.su 2000 - 2006 Experiment time 6-th International Workshop on Accelerator Operations, Trieste, 24-28 September 2007

  11. The VEPP-4M Collider Operation in the Experiment of Precise Tau-lepton Mass Measurement BINPNovosibirsk http://v4.inp.nsk.su Shift supervisor Operation On-call personnel:injector,magnet power supplies, RF system,injection/extraction,beam diagnostics,control system,electronics,software. Technician on duty KEDR detector operator SR userscoordinator Services: power service,vacuum,cooling water,conditioning,transport,etc. SRusers KEDRon-callpersonnel Shift supervisors:12 physicists, 4 engineers,2 post-graduate students 6-th International Workshop on Accelerator Operations, Trieste, 24-28 September 2007

  12. The VEPP-4M Collider Operation in the Experiment of Precise Tau-lepton Mass Measurement BINPNovosibirsk http://v4.inp.nsk.su Control room workstations Injectorcontrol VEPP-4Mmagnet & RF systems Machine control and monitoring Injectormonitoring VEPP-4Mbeammonitoring VEPP-3magnet system Ethernet VEPP-3RF system KEDRmonitoring Transport linecontrol Vacuum,temperature,radiation VEPP-3beam monitoring Transport linemonitoring 6-th International Workshop on Accelerator Operations, Trieste, 24-28 September 2007

  13. The VEPP-4M Collider Operation in the Experiment of Precise Tau-lepton Mass Measurement BINPNovosibirsk http://v4.inp.nsk.su On-line status in the www 6-th International Workshop on Accelerator Operations, Trieste, 24-28 September 2007

  14. The VEPP-4M Collider Operation in the Experiment of Precise Tau-lepton Mass Measurement BINPNovosibirsk http://v4.inp.nsk.su • PostgreSQL database • more than 1500 parameters of beams and accelerators • 1-second samples are available during last 24 hours • 30-second samples are stored for 1 year • older data are available from an archive storage • a set of typical data request scripts is developed • GUI Database 6-th International Workshop on Accelerator Operations, Trieste, 24-28 September 2007

  15. The VEPP-4M Collider Operation in the Experiment of Precise Tau-lepton Mass Measurement BINPNovosibirsk http://v4.inp.nsk.su • accumulation of positrons in the VEPP-3 (15-20 minutes), • acceleration up to the extraction energy (5 minutes), • bunch-by-bunch extraction and injection into the VEPP-4M, • magnetic cycle and polarity change of the VEPP-3 and Injector (5 minutes), • electron accumulation (1-2 minutes), acceleration and injection into the VEPP-4M. • Total time required to refill beams in the VEPP-4M is 30-40 minutes. Working cycle in a HEP experiment 6-th International Workshop on Accelerator Operations, Trieste, 24-28 September 2007

  16. The VEPP-4M Collider Operation in the Experiment of Precise Tau-lepton Mass Measurement BINPNovosibirsk http://v4.inp.nsk.su Betatron tunes Working cycle automation luminositybeam currents beam energies betatron tunes beam sizes beam orbits magnet fieldstimingtemperatures etc. Luminositycontrol Injector Betatron coupling VEPP-3 Beam matching at IP Transport lines “Autopilot” Injector control VEPP-4M e+/e- accumulationin the VEPP-3 KEDR Acceleration VEPP-4M beaminjection control Beam separation at IP VEPP-4M injection VEPP-3 magnet cycle Polarity change 6-th International Workshop on Accelerator Operations, Trieste, 24-28 September 2007

  17. The VEPP-4M Collider Operation in the Experiment of Precise Tau-lepton Mass Measurement BINPNovosibirsk http://v4.inp.nsk.su Results of working cycle automation 6-th International Workshop on Accelerator Operations, Trieste, 24-28 September 2007

  18. The VEPP-4M Collider Operation in the Experiment of Precise Tau-lepton Mass Measurement BINPNovosibirsk http://v4.inp.nsk.su Working time loss incoming power failure, cooling water overheat or leakage, vacuum deterioration Magnet systems, RF systems, beam diagnostic instruments, beam energy measurement systems, etc. including operator trainingon-the-run both system and application control computers, CAMAC electronics, low-power circuitry of the magnet power supplies and RF systems 6-th International Workshop on Accelerator Operations, Trieste, 24-28 September 2007

  19. The VEPP-4M Collider Operation in the Experiment of Precise Tau-lepton Mass Measurement BINPNovosibirsk http://v4.inp.nsk.su Failure indication: no luminosity,beam loss,alarm,etc Repair by the shift staff(replace defective devices) Failure recovering Easy No Yes Search fault location Phone to anexpert Call theexpert Return tooperation Fault analysis Yes Complex Repair by the expert Switch off the machine No 6-th International Workshop on Accelerator Operations, Trieste, 24-28 September 2007

  20. The VEPP-4M Collider Operation in the Experiment of Precise Tau-lepton Mass Measurement BINPNovosibirsk http://v4.inp.nsk.su One of peculiarities of the HEP experiments realized at the VEPP-4M is the high-precision beam energy evaluation. To estimate the beam energy between absolute calibrations by the resonance depolarization method, an empirical formula is used. This formula gives 20 keV accuracy of energy interpolation using the dipole magnetic field and temperature of the magnets, tunnel walls, cooling water, etc. On-line monitoring of the magnetic field with 10-6 accuracy is realized by the nuclear magnetic resonance method. For the precise temperature monitoring, a new system has been developed. Performance improvement:Temperature monitoring system 6-th International Workshop on Accelerator Operations, Trieste, 24-28 September 2007

  21. The VEPP-4M Collider Operation in the Experiment of Precise Tau-lepton Mass Measurement BINPNovosibirsk http://v4.inp.nsk.su Hardware: High-Precision Digital Thermometers DS1631 with the resolution of 0.0625oC and absolute accuracy of 0.5oC in the 0–70oC temperature range. 32-channel controller developed in BINP: automatic scanning of the temperature sensors every second and data writing into the internal memory; relay interlock function to prevent overheat. Software: Control program reads data from the all the controllers and writes it to a PostgreSQL database. GUI is also developed. Performance improvement:Temperature monitoring system The controller. 1 – temperature sensor board;2 – sensor inside the protection case. 6-th International Workshop on Accelerator Operations, Trieste, 24-28 September 2007

  22. The VEPP-4M Collider Operation in the Experiment of Precise Tau-lepton Mass Measurement BINPNovosibirsk http://v4.inp.nsk.su Measured diurnal variations of the VEPP-4M beam energy. Main factor - temperature drift of the VEPP-4M magnets. Perturbing factors: ambient temperature, atmospheric humidity,conditions in a cooling tower, etc. Double-loop water cooling system High-precision thermal sensors Computer-controlled valve Performance improvement:Thermostabilization of the magnets 6-th International Workshop on Accelerator Operations, Trieste, 24-28 September 2007

  23. The VEPP-4M Collider Operation in the Experiment of Precise Tau-lepton Mass Measurement BINPNovosibirsk http://v4.inp.nsk.su Performance improvement:Thermostabilization of the magnets Thermostabilization ON Thermostabilization OFF 6-th International Workshop on Accelerator Operations, Trieste, 24-28 September 2007

  24. The VEPP-4M Collider Operation in the Experiment of Precise Tau-lepton Mass Measurement BINPNovosibirsk http://v4.inp.nsk.su Unstable phase oscillation occurs due to parasitic high-order modes of the VEPP-4M RF cavities. This instability is one of the main efficiency decreasing factors, because it reduces luminosity drastically. High-amplitude phase oscillation leads to particle loss and can be dangerous for the KEDR detector. RF cavity temperature variation results in the cavity deformation and then leads to a shift of working conditions away from the stability regions. Performance improvement:Thermostabilization of the RF cavities 6-th International Workshop on Accelerator Operations, Trieste, 24-28 September 2007

  25. The VEPP-4M Collider Operation in the Experiment of Precise Tau-lepton Mass Measurement BINPNovosibirsk http://v4.inp.nsk.su Thermostabilization OFF, Dt=2oC Performance improvement:Thermostabilization of the RF cavities Temperature is measured by thermo-sensors with a sensitivity of 10 mV/oC. For each RF cavity, 5 kW flowing water heater is switched on/off by controllable electronic switches. Temperature analysis and power control is provided by a microcontroller. Thermostabilization ON, Dt=0.5oC 6-th International Workshop on Accelerator Operations, Trieste, 24-28 September 2007

  26. The VEPP-4M Collider Operation in the Experiment of Precise Tau-lepton Mass Measurement BINPNovosibirsk http://v4.inp.nsk.su Luminosity integral 2004 – 2006 6-th International Workshop on Accelerator Operations, Trieste, 24-28 September 2007

  27. The VEPP-4M Collider Operation in the Experiment of Precise Tau-lepton Mass Measurement BINPNovosibirsk http://v4.inp.nsk.su Engineers Laboratorytechnicians A.AleshaevA.BogomyagkovS.KarnaevV.KiselevE.KremyanskayaE.LevichevO.MeshkovS.MishnevI.MorozovN.MuchnoiS.NikitinI.OkunevV.PetrovP.PiminovYu.PupkovE.SimonovS.SinyatkinV.SmalukG.TumaikinD.ShatilovA.Zhuravlev O.AnchugovI.BannikovM.BokovM.BrovinD.BurenkovS.VasichevYu.GlukhovchenkoO.GordeevV.ErokhovA.ZhmakaV.NeufeldO.PlotnikovaA.PolyanskiyV.SandyrevV.SvischevI.UtjupinM.FominD.Shvedov A.ApanasenkoG.BelyakovV.BykovA.KolesnikovG.KurganovP.KoshkinI.LubyaginA.MaslovI.MishinA.PetrovA.PoroshinI.RomanovS.RudakovP.SvischevA.SoshilovL.StebailoN.TurV.TuraevA.ChabanovV.Shvaibovich The VEPP-4 team Physicist andpost-graduate students 6-th International Workshop on Accelerator Operations, Trieste, 24-28 September 2007

  28. The VEPP-4M Collider Operation in the Experiment of Precise Tau-lepton Mass Measurement BINPNovosibirsk http://v4.inp.nsk.su Thank you for your attention 6-th International Workshop on Accelerator Operations, Trieste, 24-28 September 2007

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