Features

The stainless steel chamber is of 1.5 m diameter, 0.6 m height and 1100 l volume. Several ports are provided to the chamber, for viewing as well as for attaching additional equipment. It has 10 inch dia ports at 30^o , 90^o, -20^o and -90^o ; 6 inch dia ports at 120^o, 160^o, -120^o and -150^o. The ports at -90^o, -150^o, 60^o, and 160^o have viewing glass windows. The top lid also has a viewing port.

Operating pressure of the chamber is low 10^-6 mbar which is achievable in 2-3 hours. This chamber is equipped with a 2000 l/s diffusion pump backed by a 2000 l/m rotary pump with fore line trap. Operation of the pumping system is pneumatically controlled and facilitated with proper interlocking.

A target ladder, which is movable in vertical direction and rotatable in 360^o, is provided from the centre of the chamber bottom plate. Several targets can be mounted on the ladder including a beam-viewing quartz. The target ladder is isolated from the chamber body and there is provision for taking ladder current signal outside the chamber through a co-axial cable. There are two rotatable detector arms with precision angle measuring devices incorporated. Each detector arm has provision for mounting detectors at a separation of 6^o. The arm angle can be read with an accuracy of ± 0.05^o. Remote control system is available for the movement of the target ladder as well as the detector arms.

There is provision for mounting two monitor detectors at ± 10^o on the chamber wall and two detectors at ± 15^o by hanging them from the chamber lid. A collimator of required dimension can be mounted at the beam entrance port of the chamber. The exit port of the chamber has a beam dump provided with electron-suppressed Faraday cup to measure beam current.