The HKS chambers were in Hall C out in the open for possible use in G0. They are using the same amplifier/discriminator cards that we are planning to use for the Qweak region II chambers, so we wanted to check them out. We also got a good look at the chamber construction in general and the mechanical support for the cards.
These pictures show the whole chamber from the right and left.
Figure 1a - The whole HKS chamber from the right.
Figure 1b - The whole HKS chamber from the left.
The chamber is made of layers of g10 and they are held together with an aluminum frame. Outside of that is an aluminum support that is larger than the readouts and the ends of the chamber.
Figure 2a - The aluminum support for the whole chamber.
Figure 2b - The aluminum support for the chamber and the frame.
The cards are nanometric cards, but they are slightly different from the ones we are planning to use. There is a serial number on the cards - 1403 - near the top right of the visible part of the card near the shield.
Figure 3a - An overall picure of the card layout.
Figure 3b - A closeup of one card.
The cards are supported on individial g10 boards with traces to the signal inputs, power, and the grounds. It is these boards that plug into the chamber itself. They are supported on a piece of g10 which was cut larger than those making up the regular planes. The boards are all read out on the sides of the chamber and the are place right on top of each other and attached to the large piece of g10 with spacers and a screw.
The ribbon cables appear to be wrapped in a ground sheath which is not connected.
Figure 4a - The traces on an individual board.
Figure 4b - The supporting piece of g10.
Figure 4c - An edge on view of the spacers between boards.
Figure 4d - The ground sheath around the ribbon cable.
The high voltage connections are made from the two ends of the chamber.
Figure 5a - Edge on view of the high voltage connections.
Figure 5b - angle view of the high voltage connections.
The power for the cards is run from card to card on the individual boards. The connection to the supply is made at one end of the chamber. The HV for the planes is also in the same area.
Figure 6a - The power and high voltage main
Figure 6b - The power and high voltage main
Figure 6c - The power and high voltage main
connections, angle view.
connections, edge on view.
connections, top view.
