Linac Test Area Instrumentation Update M Haney D
- Slides: 12
Linac Test Area Instrumentation Update M. Haney, D. Errede, Z. Conway University of Illinois at Urbana-Champaign 14 June 2002 m. haney, et al.
Instrumentation • Need safe solution for instrumenting the LH 2 absorber in the LTA • Prudent to accommodate MICE and European safety considerations – i. e. do it right the first time… 14 June 2002 m. haney, et al. 2
Primary Objective - Safety • Intrinsic safety, if possible – Less than 1 watt (per channel? ) – Good idea for Fermi; required for Europe • Gas-purged enclosure, if necessary – 19” rack, 40 U tall 14 June 2002 m. haney, et al. 3
Signals inside (the cryostat) • 12 (cryo) temperatures – readout via GPIB + Lab. View (PC) • 25(ish) 4 -wire bolometry strips • Multiple fibers – FISO strain gages – Laser occlusion? – Simple spark detectors • (light pipe to photodiode) 14 June 2002 m. haney, et al. 4
(more) Signals inside • USB (4 wires, and shield) for CCD camera – via PC • Piezo vibration sensor – via (16 chan/12 bit) ADC and Lab. View (PC) • Local (64 chan/16 bit) IRM channels – via “Lab. View” (see last slide) • MICE channels (? ) – placeholder for the future… 14 June 2002 m. haney, et al. 5
Signals outside • Many voltages, currents, temperatures, pressures – magnets, beam position monitors, etc. • Most available from ACNET or local IRM – via “Lab. View” (see last slide) • or Cyro-PLC – and Intellution 14 June 2002 m. haney, et al. 6
Two Possibilities (1) • Intrinsically safe Hazard Safe Sealed Conduit(s) Barrier(s) IRM ACNET Cryo(temp) FISO PC w/32 chan ADC Intrinsically safe signal conditioners and transmitters 14 June 2002 m. haney, et al. UPS network power 7
Two Possibilities (2) • Gas-purged box Hazard Safe Barrier(s) Sealed Conduit(s) ACNET IRM Cryo(temp) FISO PC w/32 chan ADC power UPS 14 June 2002 network m. haney, et al. 8
(basic) Barrier fuse Power + Signal “safe circuit” Return Ground 14 June 2002 m. haney, et al. 9
This Summer – Z. Conway • Lab. View interface – GPIB – ADC – IRM 14 June 2002 m. haney, et al. 10
Open Issues • Local signal condition vs Purged box – Common mode concerns (noise from magnets) • Especially surge currents on start/stop – Long wires! • 2 -wire vs 4 -wire solutions – Shielding and noise sensitivity in general – Cable plant size concern • (already 200+ wires, not including shielding) 14 June 2002 m. haney, et al. 11
Open Issues (2) • Lab. View vs C – to read ACNET data (mostly, IRMs outside of the experiment) • Remote control of PC – Citrix ICA, PCAny. Where, etc. – Lab. View web-remote instrumentation – KVM? 14 June 2002 m. haney, et al. 12
