Things
I learnt that happened since December 24th, 2003
:
-
FSD of the G0 target is operational.
-
The prebuncher amplitude has been modified in the
injector.
-
Some work has been performed on gun 3 (super lattice
photocathode).
Status
of the source :
-
For the upcoming data taking we will keep on using gun 2 (strained
layered
photocathode).
-
The quantum efficiency (QE) of gun 2 photocathode is currently
0.09
The acceptable limit is around 0.05. Increasing the QE can be made
:
* changing the the spot location on the photocathode which require
1h,
* reactivating the photocathode which takes 8h.
In both case, no beam is delivered to halls so it has to be scheduled
well
in advance.
What
has been done today :
- TLDs have been put
in place in the hall (K. Grimm)
- Batteries and 50
Ohms Terminator have been installed (g0log entries #72623
and #72626
)
- Hall C switched
to "Beam permit" at 6:30pm
- The electronic of
the G0 laser has been replaced and the laser was operational at
7pm.
Plan
for tomorrow :
- Compatibility test
of hall A / G0 beam.
- As soon as we get
beam in hall C, Kaz will start checking the beam
properties.
- The decision of
delivering beam to hall A and hall C at the same time is expected on
monday.
Plans
for the next few days :
-
We will run without
any target at least until monday.
-
Halo calibration (Sarah Phillips)
-
BPM / BCM calibrations
-
Test on the Y0 signal (Paul King/Klaus Grimm)
-
Frame (specific G0 Aluminium target !) data : analysis of the data taken
in December needs to be continued and we need to ckeck with Greg
whether it could be used while the target is warmed
up.
-
Perform asymmetry measurements with cold H2 or He
gas.