From: Domenico Campi [domenico.campi@cern.ch]
Sent: 10 May 2005 15:03
To: Dave Cockerill
Subject: Re: Hall probes

Attachments: MDT-DCS-CANnode.pdf; ATT346999.txt

Dear Dave,
first of all accept my apologies  for the long delay of this answer.
We use NIKHEF B-sensors (as in ATLAS ) but with different resistors to allow the Hall probes to be saturated at 4.5 T.
Each B-sensor is attached to the CAN-node by 10 wire flat cable.
CAN-node can support up to 4 B-sensors, the nodes are connected in daisy chain by CAN-bus (4 shielded twisted pairs).
One 3-D probe card has therefore 10 wires (1 pair per probe + temp +
power)

I annex the user manual of these elements.
If you want more details I can give the name of the person in charge of this component .

One small additional consideration: if you only need a signal indicating the change of field we can supply a copy of the value of the main current in the solenoid .
Obviously at any change it correspond a field variation and thus you can act accordingly!

I remain available to further discussion.
Cheers
Domenico