Miscellaneous items
A draft of the installation plan is available here.
The location of equipment: Here is a Dec 1, 1999, drawing.
PB 27-Feb-2001: This location where conditioners have been actually installed, deviates in phi from the nominal position,
sometimes by 10 degrees or so.
Hall probes on the face of the CC
The mounting block has been manufactured at NIKHEF and has arrived at FNAL.
I have made a sketch of the design, that you can find here.
(Drawings updated Dec 1, 1999). PB 29-Jun-2000: All mounting blocks installed and surveyed.
Conditioners
- Are the conditioners DC isolated from their environment?
The conditoners have an aluminum backplane, but this backplane is not in electrical contact with the circuitry.
The distance, through air, is approx. 3 mm or 0.12 inch. A layer of 3 mm of air will easily be able to stand 1 kV.
CAN nodes & CAN bus
- Does the CAN-node work also in a magnetic field of a few hundred Gauss?
The CAN node contains 4 DC-DC converters. These may come in magnetic saturation if the
magnetic field is too strong. In our detector this is not the case, as proved by the full system
test where both toroid and solenoid were run at their intended field.
- What is the baud rate on the CAN bus and the MicroWire?
The baud rate on the CAN bus has currently been set to 125 kB.
The MicroWire is the connection between Hall Head and conditioner. The baud rate there is
300-500 kHz at 4V.
Both baud rates can be set as low as 5 kB!
- How is the shielding of the CAN bus connected to ground?
It is grounded at the power supply on the platform and only there.
Power supply
- How is the power supply isolated from the rest of the system?
The CAN bus consists of four conductors, two for signal ('CAN messages'), two for power. The signal
lines are isolated with opto-couplers. These are devices that transfrom an electrical signal into
an optical signal (the electrical isolation) and back again. The power lines are isolated through
DC-DC converters. They seem to remain operable in a field (see above).
Also, see the electrical overview of the system linked below under 'safety'.
- Will the power supply be able to run on 60 Hz?
Yes, it is working.
Safety
The safety review, as submitted Feb 2001.
Electrical Design Standards for Electronics to be Used in
Experiment Apparatus at Fermilab
The solenoid webpage
Paul Balm's homepage
URL of this page is http://www-d0.fnal.gov/nikhef/hallprobes/misc.html
Paul Balm, last modified: Nov 14, 2001