ABS tune-up / commissioning
---------------------------
Status August 2, 2002
Vacuum:
-------
+ all operational
RF dissociator:
------------
+ matchbox interface needs to be shipped to company
for repair
+ run manual matchbox instead, we managed to get
a good discharge, the system shows good matching
in rather broad power and gas flow range
QMA:
----
+ QMA shows chopped signal on amu 1 which is related
to dissociator RF on, that means we see a ballistic
atomic beam from discharge in dissociator
+ signal looks reasonable on scope but cannot be
reproduced in lock-in yet. We also observe a
irregularity in the refernece signal processed by the
lock in whic might be related
Nozzle:
-------
+ all operational
DAQ:
----
+ retrieving data and storing in ntuples
almost complete, minor problems, needs
some work still
Running in BLAST:
-----------------
list of devices to turn off during spectrometer magnet
operation:
- chopper; switch on pwer supply in D-tunnel
- QMA; turn emiss off, disconnect RS232 connection
- cryo cooling; turn off compressot on mezzanine
Tasks for August 5, 2002
-----------------------
+ establish QMA signal into lock-in amplifier and
pipe into EPICS, measure amu 1 and 2 with chopped
signal
Goal for early next week:
--------------------------
+ flow H2, measure amu1/(amu1+amu2) ratio
+ determine calibration constant k for normalized
ratio amu1/(amu1+k*amu2)
+ add oxygen to H2, repeat measuremet and optimize
for maximum amu1/(amu1+k*amu2) ratio
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