The EOS TPC In Pictures

The black plate is the underside of the optics bench. The plastic window on the side seals in the optics area, which is purged with nitrogen via the stainless steel line entering at the bottom. The chamber gas fill is at the bottom corner of the side of the main TPC chamber. The small square hole is the access port for the lifting "C" bracket. The long slotted tab extending out to the side is part of the bracket for the water manifold, the two brass pipes, connected by a triangular bracket, with a myriad of blue distribution hoses attached. The manifold is resting on the shell of the electronics bay housing the "sticks."

The large hole lets the beam pipe come right up to the field cage window.

View into the optics bench from the beam left side.

View from the downstream end. The two ports at the top of the downstream end are the TPC gas exhaust. At the bottom of the chamber are two sets of five BNC connections. These are for the laser beam position monitor and a thermocouple. The brass block at the center of the bottom is one of the three insulating jack screws used to support the TPC inside the magnet.

Detail view of the ends of the "sticks." The electronics bay is enclosed in plastic panels and purged with nitrogen. Each card has a fiber optic connector at the bottom and a single row ribbon cable connector for power.

Each stick extends half way across the chamber, connecting to one row of pads. The water cooling channels run across the chamber, following the sticks.

View down the beam left side, looking downstream. The first connector (Reynolds 20kV) is the cathode high voltage input for the drift field. The string of 16 SHV connectors are for the anode sections. The brass block between the cathode input and first anode is a ground point; there is one at each corner.

View from the upstream end of the interior of the field cage. The white square is the downstream window.

View from the downstream end looking upstream. The white line is an artifact of the camera flash on the high reflectance surfaces of the TPC field cage.

View into the downstream gap between the field cage and the wall of the TPC. The white pipe at the bottom is the gas exhaust tube. The aluminum flange at the top of the field cage is the support for the cathode plane. In this view you can see some of the construction of the field cage, which is a sandwich of kapton circuits, which form the potential rings, with a honey-comb structure. At the bottom of the gap are the laser position monitors. The short tubes attached to the side of the field cage are ports for the laser beam. The pads are visible on the inside of the cage at the bottom.

View from downstream looking up the beam right gap. The white tube at the bottom is the gas exhaust port. The gas inlet port is visible at the upstream end of the gap.

The cathode plane in position.

Bottom surface of the TPC lid.

Starting at the top left and working down, this rack contains: