see subject.

The "dead" Q-Switch signal was converted 
two times... This explains why in the 
Thorium experiment the Q-Switch signal 
(ch15) was empty. 

First conversion from TTL to NIM in the 
ESR Laserlab and unfortunately the signal 
was plugged in a second Level Adapter as 
TTL in 
the Messhütte and was "again" converted 
into a NIM for DAQ1/2.

Now the Q-Switch is converted from TTL to 
NIM in the ESR Laserlab. The NIM is 
afterwards guided through a Logic Fan 
In/Out to the 2 DAQs. 

We found a "Bug" in the control of the Sirah dye system.

Due that we don't use the FCU and the temperature control unit we could not start the Sirah software without getting numerous errors. 
The fix was to plug in the BBO oven again, move the FCU to "origin", than move to a specific location that the FCU goes in an "idle" mode. 
Than the Sirah software can be started again without getting erros. 

"Laser step complete" and "laser scan complete" are working again.

Problems:
1) Connections were wrong in the Software. 
2) Sometimes the connection to "laser scan complete" was lost (Wackelkontakt).
3) The VI was initialized with the wrong LabJack Channels.

Now:
1) fixed connections in the software.
2) switch to an other "channel" of the LabJack device for "laser scan complete".
3) The channels in the Cobra VI are for...
laser scan complete -> Channel 5
laser step complete -> 6

We definetely should keep an eye and check frequently the signals, that we do not have a lost connection (Wackelkontakt) again of these 2 channels.

Current status: 
Laser busy signal works correctly (5V if the grating moves, 0V if not) if the laser is operated by the Sirah software.

When the laser is controled by the "Thorium Main VI" the laser busy signal is always 0V.

Solution for a working laser busy / dye out signal was to disable the FCU and set the FCU status to "False" (see attached picture).

Remark: FCU unit will not be used for Bismuth experiment!

I changed the laser step complete cabling from a quad coinc (see attached picture) to a Logic Fan In / Fan out (same as laser scan complete).
The "detour" through the quad coinc yielded to a very short laser step complete signal of ~500ns...

Due to the change it is now ~15µs long and has the same length as the laser scan complete signal (~15µs).

We changed PMT north and PMT south and tested them at 1500 V.

Both new PMTs are broadband.

PMT north and middle see between 2 and 7 kHz signal rate with a threshold close to the background noise.
PMT south still has the plastic cap on and is intended to be used as a reference for electro-magnetic disruptions. No signal was seen at 1500 V.
We fixed the signal cable of PMT south to the NIM-crate to get rid of background noise picked up by the cable.

We coupled the laser through a multi-mode fiber into the wavemeter.
With the main amplifier enabled, we got enough power behind the fiber (0.5 - 1.5 mW) to use the wavemeter with 34 ms exposure time (1s / 30Hz to prevent jumps in the wavemeter readout).

Pictures below: 
1: First test scan with 34ms exp. time.
2: Comp. too large laser power (2. scan duoblet) vs. attenuated power (right scan doublet). The latter has less hickups.
3: Laser scan with attenuated power in go4.

The measured frequencies in the first scan step are unstable in any case.

Spikes (rather "second wavelength the laser is regulrarly jumping to") can be removed by adjusting the fiber coupling with the mirrors (change of interference pattern) or the L/2-waveplate (change of coupled power).
However, during (and after) the scan the spikes seem to reappear.

The main control room started setting up the Bi beam this morning, but quickly stopped in order to solve some problems around the UNILAC. Therefore we 
should not plan to receive ions earlier than late in the evening on Monday, or probably Tuesday during the day.

We performed an autocalibration (attached picture 1) of the Keysight 34465A DMM (TUD Keysight).

The position and the "cabling" to the cooler platform was also adjusted (picture 2,3).

Voltage SA_SZ (capture behind cooler): 1500 V (thin plastic scintillator)
Voltage NA_SZ (capture behind target): 750V (thick plastic, short absorption length)

Voltages and thershholds from thorium run, still to be verified.