D-line
Notes: default counter/ timer configuration
CAMAC units
- channel 0/0: sec (timer fed by MHz clock)
- channel 0/1: Itot (cave ion chamber - total flux into hutch)
- channel 1/0: Idet (user ion chamber or diode as detector)
- channel 1/1: Imon (ion chamber behind shutter or diode beam stop
- monitor flux through beam-defining slits s1, s2)
- channel 2/0: Iprot (solar cell or diode on garage door or beam
stop - equipment protection)
- channel 2/1: ready ("ready" signal for CCD-SPEC handshake)
- channel 3/0: ssd1 (solid state detector, channel 1 from quad
discriminator)
- channel 3/1: ssd2 (solid state detector, channel 2 from quad
discriminator)
(The CAMAC system was decommissioned in summer of 2006)
VME units
- channel 0/0
- ...
- channel 0/7
The D-line monitor
detectors
Whether
you use it or not - all you get is Itot.
The beam on the sample - Imon
will show that it's ample.
If you want to measure - Idet
will do the pleasure.
If the beam gets too hot - this will tell you Iprot.
(DS with apologies to the muse of poetry)
Gating
- by timer
- by each of the other
7 scalers acting as monitor
- by Medoptics CCD
controller via NAND box
- by "HEP in Progress"
signal via MacCHESS box
Digital I/O
The CCD interface was reconfigured from CAMAC A/D converter & V/f
converter + scaler to a simple digital I/O interface whicg sets and
reads TTL level signals.