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IHEP activity in barrel

Alexander Vasiliev (IHEP-Protvino). IHEP activity in barrel. PANDA electromagnetic calorimeter session. Decree of Russian Government on participation of Russia in FAIR and Rosatom ‘Scientific and Technical Council’ meeting

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IHEP activity in barrel

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  1. Alexander Vasiliev (IHEP-Protvino) IHEP activity in barrel PANDA electromagnetic calorimeter session

  2. Decree of Russian Government on participation of Russia in FAIR and Rosatom ‘Scientific and Technical Council’ meeting Rosatom Order on founding the Russian FAIR Scientific and Technical Committee. Status of the Bogoroditsk plant. Content • PWO radiation study facility at IHEP (Vasily Mochalov) • Mechanical design work (Andrei Levin) • Neutron irradiation of the PWO crystals and PWO induced activity • Progress in carbon fiber technology at IHEP • Conclusions 2

  3. Decree of Russian Government on FAIR is signed by V.V.Putin and officially published (Number 245-р dated by February 27, 2010) Anticipated Russian participation in FAIR • Participation of Russia in FAIR in the frame of the strategic partnership with Germany  15% of the FAIR full cost, which is 178 M Euro in 2005 costs 3

  4. Took place on February 10, 2010  “Role and Participation of the Russian Institutes in FAIR”. The FAIR Scientific Director Boris Sharkov made a report on FAIR status at the meeting. Rosatom ‘Scientific and Technical Council’ meeting • Decisions of the meeting important for PANDA were taken: • STC recommended Rosatom to continue a financial support of IHEP in the PANDA calorimetry R&D studies • STC recommended Rosatom to set up Scientific and Technical Committee (STC) to coordinate the Russian institutes participation in FAIR (accelerators and PANDA/CBM/NuSTAR/APPA) • Rosatom Order # 274 dated by April 9, 2010 – STC is founded (15 members). 4

  5. The plant is in the process ofbankruptcy. May – platinum will be taken to “Gochran”. June – the court will announce the plant as a bankrupt. “After that the plant will immediately start to be sell off by pieces” – Director Alexei Baberdin. To save the plant – show the Protocol of Intent in May and at the court in June. A specific date of a Contract signature will have to be pointed out in the Protocol (Contract to produce up to ~9,500 of last PWO crystals). Status of the Bogoroditsk plant

  6. PWO radiation study facility at IHEP Goal – long term (months!) continuous irradiation of PWO crystals at negative temperatures 6

  7. Main parts of the irradiation experimental setup neutron source (4 Pu-α Be) Gamma source Co60(7x1012) Crystal container Lauda cryothermostat

  8. The neutron irradiation study Neutron source • FourPu-α-Be sources were used for irradiation study • Sources were placed in special polyethylene collimator • Integral Nominal Intensity 1.9∙108neutrons in 4π. • Measured fluence at crystal place (20 cm from sources) is ~3∙104n/(cm2∙sec). • Calculated fluence (MCNP) ~4.2∙104n/(sm2∙sec). • Dose rate of convoyed gamma-irradiation was ~70 mrad/h. Spectrophotometer will have to be incorporated into setup (instead of 450 nm and 640 nm  330 nm – 1000 nm) Crystal box LAUDA

  9. Comparison of gamma and neutron irradiations Luminiscence signal change Blue LED signal change

  10. Comparison 2 Luminiscence signal change Blue LED signal change Plateau was not achieved after 300 hours of irradiation

  11. “Neutron irradiation” “Induced activity” – specific experiment was carried out Some PWO crystals (2.7x2.7x22 cm3) were irradiated near the internal target of 70-GeV IHEP accelerator. Beam duration was 1 sec. Full cycle was 9 sec. Intensity was 5x1011 at the target. Time of irradiation was 200 sec and 150 hours to extract short-lived and long-lived isotopes. The mean energy of the secondary particles from the target was several GeV. Wide set of the secondary particles. ~25 long-lived and ~30 short-lived radionuclides were identified. Two papers are under preparation

  12. PWO mechanical support carbon fiber technology at IHEP Mould to produce carbon fiber prototype 4

  13. PWO mechanical support carbon fiber technology at IHEP “Crystal” sizes are 27x27x250 mm3, an accuracy of the mould production is 20 mkm. 4

  14. PWO mechanical support carbon fiber technology at IHEP 4

  15. PWO mechanical support carbon fiber technology at IHEP Mandrel is to be wrapped by carbon fiber raw material (prepreg, 120 mkm), installed into the mould and baked in the furnace A hole is for the temperature monitor 4

  16. Prepreg Unidirectional(UD) Carbon fibers 3K Thick-100 µm Wide -300 mm, CJSC "Prepreg", Moscow, Russia

  17. Prepreg Cutting the strips 10 mm wide.Winding around the mandrel butting the edges, 2 layers at an angle of 120° .

  18. Fabrication of one cell alveole with mould While assembling the mould, a gap of 200 µm is provided between the mandrel and each of the sides.

  19. Heating chamber Curing (2 hours, 180°C) Temperature monitoring of mould at 2 points Temperature monitors Temperature sensor

  20. Alveolar cell

  21. Try to solve the Bogoroditsk problem. Incorporate spectrophotometer in the IHEP irradiation facility and start up a long term irradiation (~100 days) of several PWO crystals with a PANDA dose rate at ~-200C. A production of the first carbon fiber prototype for PWO mechanical support has started. Quality? Make mechanical drawings and strength calculations – two engineers (Andrei Levin and Alexander Ryabov) Finish up writing and submit two papers – ‘neutron irradiation’ and ‘induced activity’ Conclusions – the nearest plans 21

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