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Ip_channel is the channel number (starting at 0, in the above example this is the third
channel) of the proton beam current signal, 100 kHz correspond to 1 mA.
preset channels is the bitmask for the scaler channels used for the preset counting
register in hex form. In the above example this is the proton current (equivalent to
counting for a certain number of incoming muons). 3
rd
channel has bitmask 0100,
represented by 0x4 in hex code.
preset_value is the number of counts per field points in the preset_channel. 1’500’000
counts in the proton beam channel correspond to 10 seconds measurement time at an
average beam of 1.5 mA. Keep in mind that the scaler is read only every 3 seconds…
Forward_Detectors, Backward_Detectors is the bitmask for the detectors in hex code.
FW: 0x7F0000 == 0111 1111 0000 0000 0000 0000 == channels 17 – 23 out of 32,
BW: 0x7F0 == 0000 0000 0000 0111 1111 0000 == channels 5 – 11 out of 32.
Channel_norm_time
scaler[n] (#n) is number of the channel used for the clock signal
(starting at channel 0, here in the second channel (
scaler[1]))
and Rate_norm_time is the clock frequency (1 kHz).
Contacts:
robert.scheuermann@psi.ch phone: 3465
alexey.stoykov@psi.ch phone: 3200
πE3 mobile phone: 5883
ALC counting room: 3025