1. HV system migration to USB interface Presented by Korolev M.

2. Outline Current situation  HV Control Unit Hardware  Proposed HV System layout  HV Control Unit Software  HV System Current calibration Planning for 2011 year 2Bondar N. Korolev M. Maev O.

3. Current situation  HV Control Unit Hardware Back plane A-Side output connectors C-Side output connectors 5 channel interface for A-Side 5 channel interface for C-Side USB connectors 2 pc. of HV Control Units are assembled, debugged and tested Problems: -Opal Kelly changed Firmware as a result the project was changed - Few small mistakes in assembly Bondar N. Korolev M. Maev O.

4. HV System C Matsusada HV CU HV System A Matsusada PC HVM Server A PC HVM Server C USB RS232 HV Ethernet USB RS232 Current situation  Proposed HV System layout

5. 5Bondar N. Korolev M. Maev O. Current situation  HV Control Unit Software Main part of SW for HV Control Unit is almost ready. Debugging and testing is in progress. Control tasks:  Control and monitoring Master Boards (MB)  Control and monitoring Remote Distribution Boards (RDB)  Control and monitoring Matsusada PS  Smart output current monitoring 1.Soft trip 2.Trip  Exchange information with PVSS

6. Bondar N. Korolev M. Maev O.6 Current situation  output current and voltage sensors calibration In order to have more precise current measurements a new procedure of current sensors calibration has been developed. -The RDB test load box with 3 nominal resistors are assembled Scale divided on three regions: 0-4 muA (~+-2-3 nA precision) – 1GOhm res. 4-40 muA (+- 10 nA precision) – 100 MOhm res. 40 -100 muA(+-100 nA precision) – 10MOhm res. - Special tool for measurement RDB and MB high voltage is prepared -SW for calibration of HV and current sensors is in progress

7. We are planning to migrate to new HV Control Unit during of 2012 year shutdown. To meet this milestone we need complete the following tasks:  debugging and testing of HV Control Unit SW  HV Control Unit Software implemented to PVSS – Who?  Implemented some tests in situ  Solve the problem with LV for RDB Visits to CERN for Korolev M. for 2011 y - 4-6 months for the next year Bondar N. Korolev M. Maev O.7 Planning for 2011 year