target box

1
The Target Box
The nuclear reactions take place at the target
foil inside the Target Box. The box is a thin (2
mm) aluminum sphere accommodating a start
detector, a target wheel, an annular position
sensitive for scattered ions, a beam monitor
detector and the gamma array.
DSSSD

• Target materialrather thick 2 mg/cm2 Si, Mg,
  Ni...

beam direction
first stop detector
Stop detector
target Faraday cup
shield

• The start transmission detector shown below is a
  thin position sensitive transmission detector,
  located in front of the target, to be used as
  trigger and TOF start. The detector can provide a
  start signal (200 ps resolution) at high
  counting rates (lt106 ions/s). Inserted in the
  beam the transmission factor is 0.88. Such a
  device will also be used as a first stop
  detector.

• A Faraday cup with a thin input window and 1 bar
  gas pressure together with a Multi-Wire Chamber
  ensures beam monitoring and final beam stop after
  the target box (see sketch above). With 10 wires
  in each direction and a delay line readout
  technique, the monitoring of the position of the
  beam can be achieved up 105 ions/s. It handles
  pulsed or dc beams, and most of the activity is
  removed with the gas flow.

Start detector (Typical potentials)