We did not see any signal at PMT North which was the narrowband PMT. Changed it to the old solar blind PMT. Now we see the resonance. It is about 3 times larger as PMT middle, most likely because of the larger window. CFD threshold was set. I also increased the CFD threshold for PMT middle slightly.


HV for  PMT North: 1600 V

We recorded files with high wavemeter readout rate and saved it at the atplaser network drive (Q:) - Bismuth - wavemeter folder.

Could be used to calibrate the laser steps. The MBS readout rate is 4 Hz, here 30 Hz, so there are a few more values.

During the last run, PMT North showed some weird noise.

The PMT was replaced by the deep UV PMT with small aceptance range (100-200nm) but there was still a lot of noise on the output channel in the Messhütte, see attached photo. The intensity of the noise signal was as strong as a normal signal count.

I replaced all cables and used other preamplifier channels. The noise is gone and the baseline is flat now. However, the timing of PMT north will be a bit different now, so we should use PMT middle for the laser/ion overlap as we did before.

Graziano opened the valves for the laser and turned off the vacuum gauges and emergency lights. The background of the UV PMT looks normal (Middle 10 Hz, North 1 Hz) so I think we are fine here.

Timing for the final measurements on 209Bi was determined for the new frequency 1.93777MHz. Peak positions are

PD NO 106
PD SO 141.5
PMT MIDDLE 45 (due to the broad temporal structure difficult to determine)

Center between PDs is 123.75. Difference to PMT MIDDLE is 78.75. This is ~3 bins larger than the half period of 75. 

XUV-Detector shows up to 100 kHz and, therefore, was turned off.

During the setup of the ion beam the voltage range of the Keysight DMM was changed from 10V to 1V. Additionally, the name of the high-voltage divider was adjusted (this changes only the filename of the file, which is stored at the local pc decpc003).

1. Create relevant histograms (change of variable MAX_STEP from 10 to 13 and insertion of histogram names "QSWP1MS", "NORTH_GATED" and "MIDDLE_GATED" in the std::string array stepNames.
   Both adaptions were made in TLdaInputDescription.h)
   
   
2. Fill the respective histograms. Changed lines of files TLdaAnlProc.cxx, TLdaAnlProc.h are listed below.
   

9:27 XUV-Detector is running again.

-5V cathode, 8A main coil, 2.4A sec.coil
Rate without beam was: 
Park position: ~300Hz 

Pump beneath the detector is now shut down, new rate: <10Hz.

Threshold was adjusted to trigger only on "nice" signals. 

Rate with beam in and laser:
Park position: ~400Hz
147mm: ~1.4kHz
 
with 2e6 ions

Attached are the MSCF shaper settings applied on Tue May 10 at 22:30.

Dear all,

unfortunately, the E128 experiment must now come to an early end. 
The problem(s) with the injection septum are severe and no work around solution (with acceptable risks) could be found. 
Several things were tried, but without hope. 

Many thanks to everybody involved during the preparation time and the shifts during the beamtime. 

Best wishes,

Wilfried

I have switched off the XUV detector on 1 June at about 17:00. 
The high voltages of the MCP (in ESR laser lab) were turned off and inside the ESR cave the power supplies (coils and cathode) and the crate were turned off. 
Also the new "control box" for the detector was switched off. 
And I checked (visually) that the XUV detector (and the Cu detector too) were indeed "moved out". 

Danyal

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. 

SASZ and NASZ voltages were switched off bevor we went back to 209Bi. Laser beam stabilization turned off.

We deactivated the automation of the XUV detector. It stays out now.