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PUL 03 Pulser

The PUL 03 is primarily designed for use with Ionoptika ion beam systems to provide a pulsed beam. It can also be used with other systems that have suitable termination.

pul03 Ionoptika is an ion beam technology company based in Chandlers Ford, Hampshire UK, committed to the development of high performance and novel ion beam systems, J105 Ion gun and accessories and repairs

 

Description


The PUL 03 comprises a control box, a 24 V dc power supply and an amplifier that connects directly to the ion column feedthrough . The pulser is controlled by means of a touch pad on the top of the unit. Mode of operation, voltage, and pulse width are selectable.

It is designed to drive an open circuit load of 4 to 10 pF capacitance. It is not intended to run into any resistive load or short circuit of less then 10Mohm.

The Pulser has 4 modes of operation:

  1. Volts to Ground Mode - This is the main mode of operation - the pulser output normally sits at the set voltage (set between +10 V and +400 V). When triggered, the output drops to zero for the set duration, then returns to the set voltage. It requires a trigger pulse of 0 to 5 volts, remaining at 5 volts for longer then the duration of the output pulse. It also needs to be at the set voltage for a minimum of 100nsec prior to the rising edge that it triggers on. The minimum pulse width is about 10nsec.

  2. Ground to Volts Mode - The second mode of operation is with the pulser output at ground, pulsing to the set voltage when triggered then back to ground after the set time. Note that this mode has a minimum pulse width of about 100nS.

  3. Follow Mode - This sets the output high when the input is high, and low when it is low (or this can be inverted).

  4. Internal Clock Mode - This allows you to set a frequency for it to run at – e.g. 10kHz – and it will then run at that speed, with pulses as set by mode 1 or 2. There is a maximum frequency of 10kHz. 

 

Specification


  • Power Input:                 24 V dc (universal mains adapter supplied)

  • Housing:                       Discrete box

  • Voltage Output:            10 V to 400 V

  • Set Voltage:                  +10 V to +400 V

  • Rise time:                      ~8 ns to 90%

  • Fall time :                       ~8 ns to 90%

  • Rep Rate:                      DC to 10 kHz, BNC TTL trigger

  • Pulse Width:                  Internal timer, 10 to 1000 ns, or Follow rise & fall of trigger pulse

  • Output connection:        BNC

 

Connections


The PUL 03 has a separate 24 V dc psu, that runs from a universal mains input. This connects to the control unit in the socket on the right hand side of the box.

There is a BNC trigger input. This requires a 0 to 5 volt pulse, of duration longer than the required output pulse. The output pulse occurs 194 ns after the trigger. The trigger pulse needs to be able to drive a 50 ohm load.

There is a circular 5 pin connector that connects the control unit to the head amplifier via a 1m cable, on the left hand side of the control unit.

There is a separate head amplifier with a BNC connection that is connected directly to the BNC vacuum feedthrough. Note that this unit is intended to drive an open circuit, and must not be used to drive a load of less then 10Mohm.

 

Control


The control box has a 20 character by 2 line display.

The top line shows:

  • The output state, on or off,
  • The output voltage,
  • The polarity of the output pulse,

The second line shows:

  • The pulse repetition rate / trigger source,
  • The pulse duration.

The output can be turned on or off using the RUN and STOP buttons.

The output voltage can be set by using the left and right arrow buttons to make the voltage reading flash and then it can be set using the up and down arrow keys.

When setting the voltage the display will show the program voltage, and then 1 second after being set it will show the actual measured output voltage. The voltage will ramp up to the set voltage over a few seconds. The output voltage, and all other parameters, can be set when the output is off.

The pulse polarity can be set by using the left and right arrow keys until the polarity indicator flashes, and then the up and down keys will select whether the output pulses to 0V or from 0V.

The pulse frequency can be set by using the left and right arrow buttons to make the frequency reading flash and then it can be set using the up and down arrow keys. Pressing the enter key when the frequency display is flashing will allow selection of whether the pulses are triggered from an external trigger or the internal clock.

The pulse duration can be set by using the left and right arrow buttons to make the pulse time reading flash and then it can be set using the up and down arrow keys. Pressing the enter key when the pulse time display is flashing, will allow selection of whether the pulse times are internally generated, or whether the output follows an input signal. If the output follows an input it can be inverted using the pulse polarity selection.