Patch panels
Fuse board
In the rack
CAEN crates

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STAR SSD

- TECHNICAL INFO

The patch panels and the cabling
This page contains informations relative to the SSD patch panel and the LV/HV cabling.

The patch panels

Two patch panels are used to connect the individual ladder power cables to the power channels. One is dedicated to the N-side (West) ladders and the other to the P-side (East) ladders. Each panel is made of 5 groups of two columns. The left column is composed of 4 connectors for the ladders and the right column is composed of 3 connectors for the +2V, -2V and +5V coming from the CAEN crates.
Near the center of the patch panel a connector is used to bring the HV from the CAEN crate to the ladders. The HV of the ladders 1 to 10 is provided on the East panel while the ladders 11 to 20 are receiving their HV using the West panel.

More detailled information can be found in this document (in French). Some pictures were also taken during the 2003 installation and can be found in a section of the phototeque.

The fuse boards

4 Amps fuses have been requested by the safety commitee to be added on the LV power lines. Fuse boards have been designed and installed between the cables from the power supply crate and the patch panel.

The SSD rack

The location of the cartes and patch panels in the SSD rack is shown on the left picture. The power supply crates are placed above and below the patch panels. A specific mechanical piece (picture below) has been designed to support the patch panel from the front and the back of the rack.

The CAEN crates

Both crate are filled with the same boards in the same slots. The following image show the original configuration of the LV and HV boards in the crates and the ladders connected to their channels.

In order to reduce the noise observed, several tests have been done and few LV cables have been flipped. The current configuration for the slots 1 (left) to 9 (right) is given by the tables below. The HV configuration (slots 0) is unchanged and given by the picture above.
Upper Crate
1N5N11N1N11N19N---19P19N
2N6N12N2N12N20N---20P20N
3N7N13N3N13N-9N----9P-9N
4N8N14N4N13N10N---10P10N
1N5N11N5N19P------19P19N
2N6N12N6N20P------20P20N
3N7N13N7N-9P-------9P-9N
4N8N14N8N10P------10P19N
Lower crate
15P5P11P1P11P15N---1P15N
16P6P12P2P12P16N---2P16N
17P7P13P3P13P17N---3P17N
18P8p14P4P14P18N---4P18N
15P5P11P5P15P------1P15N
16P6P12P6P16P------2P16N
17P7P13P7P17P------3P17N
18P8P14P8P18P------4P18N
The up-to-date configuration of the CAEN crates can be found here
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