Author

HY

Feedthroughs

The F3 chamber has following feedthroughs:

• 14 BNC (used for SSD/MCP).
• 34 pin flat cable-16 ch LEMO (for PSD, see below).
• 4 SHV (usually used for MCP).
• A set of BNC/SHV for PPAC signals/HV.
• Gas, Swagelok, 6mm x 4. (Two are used for the PPAC gas flow).

Cable panels

We have two cable panels going from E7 (CRIB) room to the J1 (counting) room. There are 15 BNC cable sets, which are named A, B, ...Q. A-L are on the panel near the D2 magnet, and the panel for M-Q are located close to the F3 chamber. One cable set has 16 cables, except for K and L, which have 14 cables. The cable panel near D2 also have 32 SHV connections.

The cable sets are used as the following:

• A:F1/F3 PPAC (5 ch x 3)
• B-G:PSD1-3 X1-X16, Y1-Y16 (96 ch)
• H-J:PSD1-3 T1-16 (48 ch)
• K:cameras etc.
• L:F2 PPAC,SSD
• M-Q: for other detectors at F3 (SSD, NaI and so on). 80 cables.

PSD flat cables and feedthroughs

Here the flat-LEMO feedthroughs are described in detail, as they are particularly complicated. However, you do not need to care for them if you use them in the standard setup (i.e. Micron PSD).

The Micron PSD output has 34 pins, and X channels are in the first row, while Y channels are in the second row.

order of channel numbers (looked from rear side):

X...left (1) to right (16)

Y...top (1) to bottom (16)

We usually use the PSD from the rear side, as the dead layer is thicker for that side. The order of the pin in Y channels is a bit confusing. ch.1-8 are in reverse order, and 9-16 are in normal order (see the table below).

We made circuit boards so that the 34 pins are separated into two male (which has pins) flat cable connectors. The two connectors correspond to X and Y.

The connections are made only in the "notched" side of the connectors, and the pins in the other side (flat side) are all grounded.

The following table shows the connections between flat cable (in the notched side) and our PSD.

Flat cable: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 (1..there is a triangle mark in the cable connector)

PSD X ch :16 15 14 13 12 11 10 9 G 8 7 6 5 4 3 2 1

PSD Y ch :16 15 14 13 12 11 10 9 G 1 2 3 4 5 6 7 8

G...GND

Our feedthroughs are connected so that the LEMO cable number corresponds to the PSD channel number. It means the feedthroughs for X and Y are different. We have 4 (or 5?) sets of X and 3 (or 4?) sets of Y flat cable-LEMO feedthrough.

Therefore, connections are just the reverse of the above,

Flat cable: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17

LEMO X :16 15 14 13 12 11 10 9 G 8 7 6 5 4 3 2 1

LEMO Y :16 15 14 13 12 11 10 9 G 1 2 3 4 5 6 7 8

G...GND

(Note: Direct connection or with X-Y separating connectors?? Please make sure.)

Question:

• How many lines do you need for your setup?