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Vacuum incident on MKB - Implication on HV performance and tests foreseen

Vacuum incident on MKB - Implication on HV performance and tests foreseen. MPP meeting Viliam Senaj,25/10/2013. MKB tank view. Common tank for 2 magnets (MKBH or MKBV) Pumping by 2 sputtering pumps in the middle plus turbo pump Up to 29 kV and 24 kA per magnet. MKB coil construction.

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Vacuum incident on MKB - Implication on HV performance and tests foreseen

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  1. Vacuum incident on MKB - Implication on HV performance and tests foreseen MPP meeting Viliam Senaj,25/10/2013

  2. MKB tank view • Common tank for 2 magnets (MKBH or MKBV) • Pumping by 2 sputtering pumps in the middle plus turbo pump • Up to 29 kV and 24 kA per magnet

  3. MKB coil construction • Copper coil in short circuit. Coil insulated and surface painted by a conductive painting and grounded • Parts with risk – coil contact (HV side), connecting plates spacer and tank feedthrough

  4. MKBV magnet view with coil HV contact

  5. Coil contact

  6. Tank feedthrough and connecting plates spacer

  7. LV side of the coil and its spacer

  8. Conditioning and electrical tests • Potentially risky places in case of Al pollution: • Tank HV feedthrough • Coil contact (HV side) • HV conductor spacer • All risky places visually inspected (with some access limitations) • Coil in short circuit mode and hence no possibility for DC conditioning • Careful pulse conditioning with slowly increasing voltage and vacuum activity surveillance (~several weeks). • As good vacuum as possible (< 10-6 mbar for full voltage) = lower risk of sparking and higher sensibility to a vacuum activity. Presently ~ 3.5x10-6mbar; sputtering pumps off (?) • Vacuum gage reading on recently installed tank not included into VAC application yet; Interlocking?Request submitted.

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