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Scintillation detectors family :

Scintillation detectors family :. Principle, hardware and maintenance. S C I N T I L L A T I O N D E T E C T O R S :. The family contains :. Scintillators : Measure the beam intensity Fast Fiscs : Show the beam position and his profile

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Scintillation detectors family :

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  1. Scintillation detectors family : Principle, hardware and maintenance

  2. SCINTILLATION DETECTORS : The family contains : • Scintillators : Measure the beam intensity • Fast Fiscs : Show the beam position and his profile • Calorimeters : Count and differentiate particles with PHA

  3. PRINCIPLE • 1 When a scintillation matter is crossed by charged particles, nearby atom is excited and when it returns to quiet state it produces a photon.. • 2 Within a light conductor (or through the air), the emitted photon reaches the photocathode of a Photomultiplier. • 3 Each incident photon produces an electron on the back of the photocathode. This one is multiplied inside the PM proportionally to the supplied HV. • 4 Electrons produced, can be viewed an electrical current pulse on the anode of the PM . Then it can be dispatched to a remote module surveyed by power PC. • 5 Inside the module these electrical pulses are discriminated then formatted and, after, memorized and counted in several registers. • 6 Each memorized information can be exploited by power PC and by computer networks.

  4. Scintillators Fast Fiscs counters This talk on two types only : BEAM Vertical fisc Horizontal fisc Scintillator Light conductor BEAM CIM box Photomultipliers Mobile crew Motor PM interface 2 CIM boxes

  5. SCINTILLATORS equipments

  6. FAST FISC equipments

  7. Remote CONTROL, TIMING • Each scintillation equipment run normally in stand alone. • Each of them are controlled by VME system (crate and modules). • A local VME intelligence (Power PC) manages many detectors modules, each of ones for several scintillation equipments, situated in a defined experiment area. • Users access VME by computer networks and run software from local computers. • ---------------------------------------------------- • General Timing clocks events inside the VME bus of the crate and to the modules. • ----------------------------------------------------- • A large amount of events can be stored locally and read remotely. • A large amount of actions can be done locally or remotely.

  8. Software's CESAR and FESA • Two software for 2 layers of actions : • CESAR for readings by an User. • FESA for readings and commands + diagnostic tools for Specialists. • Personal computer can connect you, via these 2 software's on one (or several) equipment(s) at a time.

  9. What can we do on aSCINTILLATOR ? • An Operator with CESAR can : • Read a high voltage. • Read a beam counting. - Set in or out an equipment in the beam. • See if equipment is operational or not. • A Specialist with FESA can do more : • Test the whole equipment with a led. • Set and get different parameters of the equipment. • Put an observation or disconnect the equipment. An EXPERT can do more and more :

  10. What can we do on aFAST FISC ? • An Operator with CESAR can : - Read a high voltage on each PM. - Set a filament position. - Run a scan for a beam position or profile. - See if the equipment is operational or not. • An Specialist with FESA can do more : • Test the whole equipment with leds. • Run a HV scan on the PM’s and an Expert…more and more

  11. Bad (or no) counting > No displacement >>> Cables connections ? HV power ? Module ? Power supplies Timing Resident software Motorisation ? 28V power supply Module Connections Mechanical problem A SCINTILLATOR faulty ?

  12. Bad (or no) profile >> No displacement >>> A FAST FISC faulty ? • Cables connections ? • HV power ? • Module ? • Power supplies • Timing • Resident software • Motorization ? • 28V power supply • Module • Connections • Mechanical problem

  13. FESA window Software name of the equipment Type of machine cycle chosen Property selection or user program Equipment name (for the soft) Equipment name (for the user) View of the status, detailed View of the reality on the equipment Particle counting Scroll menu for Scroll menu for different possibilities of action on HV power supplies Actual value of the HV Window where we can set a HV value Value of the default HV value (value when trigger is not used) Button for acquisition of any value Button for acquisition at the next timing event Button for setting a parameter Button for repeating measurement at each following cycle Reading and information windows are in white, Selecting windows and action buttons are in grey Arrows, near windows, indicate other possibilities

  14. Delay wire chamber profile CESAR window Analog wire chamber profile Fast fisc status Analog wire chamber status Scintillator status Our equipments Functions menu Access parameters buttons Beams Scintillator window Several windows can be open at the same time Physicist tree for equipments

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