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.

In run 8134 - 8135 PMT North showed a super high background rate. After the scan we checked the signal cables.

Incoming signal was still good until CFD. We changed channel from 2 to 12. New threshold is 36, was 10.

The final timings are (in bins +-1):

PD NO: 103
PD SO: 138
PMT middle: 44
e-cooler = (PD NO + PD SO) / 2: 121
e-cooler - PMT middle: 77
roundtrip / 2: 75
roundtrip / 2 + 10ns: 78

To accumulate more data into the opened go4, do not restart MBS, but just

sto ac
clo fi
open file lxg1297:/data.local2/208Bi/208Bi -auto -rfio
sta ac

Note: This does not work, because go4 somehow accumulates ~5 extra laser steps when starting a new scan which results in an x-axis-offset between the runs.

The problem at the ESR septum is serious. They have to remove the broken part and try to repair it.
Maybe tomorrow in the morning briefing there will be more information about this.

The night shift will not take place!
The morning shift starts at 9:00 or on further notice!

The PMTs are switched off and the laser also.

We overlapped the laser and ion bunch in the time domain. The delay has to be set on the module above the laser and NOT in the ESR Messhütte!

The values are:

PD NO: 63
PD SO: 98.5
Ion bunch: 150 

It is necessary to start go4 before you start the laser scan. Otherwise you get an offset in the laser Step plots.

• In between a measurement the scrapers stopped working in the device control. Therefore, we had to go into the electronics room.
  
• Position to scratch charge transferred beam: S1HA at -35.
  
• Beam diameter is roughly 6-7 mm (horizontally) and 4 mm vertically (as opposed to 1-2 mm).
  
• The charge transferred ion beam seems to shift the position of the main beam over time (1cm / 2h) as the main beam "transfers its intensity".
  

We checked all three signals in the Messhütte. Laser scan and laser step are OK.
The Laser busy signal is for large increments (0.1nm) also fine. For short increments like our usual 0.005nm increment the signal is irregularly.
Likely the laser busy status is too short.

We overlapped the laser and ion bunch in the time domain. 
Therefore we delayed the bunching HF in order to see the PMT signal between bin 10 and 22. Before the signal Peak was in channel ~145-5 and difficult to gate on.
Afterwards we also have to shift the laser.
The new values are:

PD NO: 77.5
PD SO: 113
Ion bunch: 16.5 

At 17:15 we changed again the E-cooler current I_e = 50 mA  
(4 laser scan loops per injection) 
E-cool HV = 225248 V 

until 15:15 we have measured with I_e = 100 mA (3 loops per file) 
E_cool HV = 225255 V 


after that (at 15:26) we changed to I_e = 200 mA (2 loops per file) 
E_cool HV = 225272 V 

after that (at 17:15) we changed to I_e = 50 mA (first 4 then 6 loops per file) 
E_cool HV = 225247 V 

Since 13:30 we have no beam in the ESR. There is a problem with the ESR septum.
The magnets department is investigating.