32-channel list mode instrument with channel number handling

The multichannel Pulse Train Recorder is implemented on the same hardware platform as the single channel device. It saves not only follow-up times but also the channel number for each impulse. Channel numbers are saved in a separate file in order to maintain compatibility with the one channel version. PTR-32 is controlled by the same software as the one channel version with some dedicated multichannel features made possible by saving channel numbers:

  • Displaying channel rates
  • Defining rings, displaying ring rates
  • Unfolding multichannel pulse trains into channel files
  • Removing data of damaged or noisy channels

Follow-up times

PTR-32 works with follow-up times instead of time stamps. Follow-up times are time intervals between consecutive detector impulses. They remain always in the same range while time stamp values grow unlimited. Time stamps are usually represented by high precision real numbers. In opposite to this follow-up times can be represented as clock counts. These are integer numbers which can be processed faster as usual time stamps. Resulting data files contain the same information as with time stamping but require less space. Follow-up time of simultaneous impulses arriving on distinct channels is zero.

Derandomizing

Digitizing cause impulse loss if there are more incoming impulses in a single clock period. Derandomizing circuits compensate for this by a fast intermediate storage which delays excess impulse processing until the next free clock period. High speed FPGA circuitry of PTR-32 can handle any number of simultaneously firing channels.

Built-in High Voltage Unit

The optional high voltage unit is automatically recognized by the control software. Value of high voltage is set from the control program. The software checks for the correct high voltage value during measurement. Units with high voltage option have also a +5V power output for the detector for convenience. They can fed the widely used HLNC detector.

Automatic recording of HV plateau

Specifications

  • Number of channels: 32
  • Impulse rate: 1 cps – 2,5x106 cps
  • Time resolution: 5ns
  • Input: >20ns TTL impulse
  • Input connector: 37 pole Canon
  • USB: Type B receptacle, USB 2.0
  • Supply: USB or 5 VDC, 2.5 A adaptor
  • Dimensions: 180 mm *200 mm* 40 mm
  • High voltage (optional): 300V-2kV, 500µA (software controlled)

Contact

József Huszti
E-mail: huszti@iki.kfki.hu
Phone: +36 1 392-2222 ext. 33-39