A large diameter rotating target wheel has been designed to be used in the sliding seal scattering chamber. It allows high beam currents to be used on targets which would otherwise melt.
A large wheel accomodates many individual targets around its circumference. The target is rotated by a motor outside the chamber connected via a ferrofluid feedthrough. The wheel position is kept track of by a shaft encoder. A custom-designed CAMAC module reads this encoder and generates a signal which can be used to sweep the beam away while a wheel spoke is in the path of the beam. The target position for each event can also be incorporated in the data stream.
- # of targets on wheel:
- approximate area of each target:
- rotational speed:
Setting Up the Rotating Target
- position the wheel so that a spoke is exactly in the path of the beam
- run a command file by typing SETWHEEL once you are in the directory from which you will be acquiring data
- answer all questions
- patch the sweep signal from the CAMAC module to the control room
- plug the event signal into the CAMAC module to latch in the target position at the time of the event.
- add the relevant cnaf's to the event program so the target position is put into the data stream
Last Updated: May 23, 1996 (D.J. Blumenthal, firstname.lastname@example.org)