Quick VPT Test Rig meeting -
minutes
Date of meeting: 25 August 2000
Venue: RAL
Present: P Flower, B Kennedy, L Lintern, M Sproston, J Williams
- Crimp tools
- MS has received 500 pins and a matching crimp tool from RS.
One other will be ordered and sent to PRH at Brunel as soon as possible.
- Single-channel tests
- Timing problems caused some delay, but now fixed. The base
plate moves about when the magnet is ramped up - needs to be fixed in place before any
measurements can be made. The noise appears to be 15% higher with the stepper motor
powered up - 2100 e instead of 1800. Some measurements are rather higher than this
though - about 2500. MS is trying to track down the cause of this inconsistent
behaviour.
- Rail system
- JHW hopes to complete this by next week. A radiation
protection expert will be on hand when the magnet is drilled, to measure the activity of
the swarf and determine the appropriate means of disposal.
- Readout/daq
- ALL will order 8-way RS232 fanout system; unfortunately the supplied
cable only has 25-pin connectors, so 8 25-9pin adapters will be needed.
- Bar-code reader
- JHW has translated the manual into intelligible English - it can be
found on the VPT web pages. Still working on reading bar codes into the LabView
control program.
- Progress at Brunel - report from PRH.
- 'We have the first "real" implementation of the 4T system
operating. That is we generate LED pulses, control the HT, and read back the VPT pulses
from a single-VPT torpedo into the ADC all under LabView control. There is much more
to do, but I think this is a good step in the right direction.'
- Omar S has sent a copy of the data-file format used at Brunel.
- AOB
- JHW has emailed IMO on the subject of their pseudo-Adam units - no
reply yet.
- JHW is designing a new version of the VPT passport/data sheet.
The manufacturer would like to supply this information as an Excel spreadsheet
eventually.
- PSF reported that the gain of the VPTs seems to vary by up to 2%/oC
in the He rig, though it is not excluded that the LED output could be varying with
temperature, rather than the VPT response.
Bruce Kennedy / 05 December 2003