Hardware for the HV system

The system is powered by 180 HV channels, 90 positive and 90 negative, by 15 A1534N boards and 15 A1534P boards, hosted in 2 SY1527 power supplies.

In March 2006 CAEN delivered the 2 Power Supplies and almost all the boards. These are the results of the tests performed on all boards.

20-Feb-2007

A1534N 21 and A1534P 32 given back to CAEN (S. Petrucci).

8-Mar-2007

Test of HV distribution boxes

On 29/08/2006 (first test at 8 kV) and 31/08/2006 (second test at 12 kV) 15 distribution boxes have been tested.

Results:

• 10 boxes OK (tested with 8 kV and 12 kV)
• 5 boxes NOT_OK
  • 4 boxes failed the first test (OverCurrent around 5000-6000 V)
  • 1 box succeded the test at 8 kV but failed the test at 12 kV (and now it's failing also at 5000-6000 kV)

Test Procedure:

Testing the internal connections:

1. GND connections: the 5 external shells of the unipolar cables and the central pin of the tripolar cable are connected
2. Hot cable: the resistance between the single pin of the tripolar connector and the internal pin of the unipolar connectors is 1 MΩ
3. the resistance between the internal pins of the unipolar connectors is 2 MΩ
4. the "cold contact" should be connected to the external shield (:?: CHECK)

Test at 8000 V:

• a tripolar cable conects the box to the A1534 board, and the channel is switched on with V0=8000 V
• the box is kept in High Voltage for a few minutes.

Test at 12000 V:

• a metallic box has being built to permit the connection from the A1526 board (unipolar connectors) to the red box (tripolar connectors)

Location:

• all the material is now in room 10, blg 29.

2. Test of HV distribution boxes

On 14/09/2006 CPE delivered 9 boxes, without any painting.

Results:

• 3 boxes OK at 12 kV (we tested one at 13 kV getting sparks, so we decided not to test the other two at 13).
• 6 boxes NOT OK

The 6 have been dismantled to check if the origin of the sparks was visible, without success.

All the remaining boxes and the connection boxes (thanks to Dimitri for helping preparing them) are in Room 10.