The gate generator of the Q-switch signal for the Vuprom TDC was set to 10ms.

15:45 Right now, we are waiting for stable conditions again. There are problems with both the ion source and the accumulation in SIS.

16:20 SIS and source look better now, but now ESR makes trouble. The stacking looks off and after deceleration and cooling barely any Th-ions are stored. The positions of the scrapers seem to be wrong. Carsten is trying to fix it.

We believe to have identified the 237U92+ and the 229Th89+ peaks. 

Using the Schottky resonator at about 244 MHz and taking the 123rd harmonic: 
The Schottky peak of 237U92+ should be at 242.7975 MHz and the one of 229Th89+ at 242.8494 MHz. 
The peaks should be ~52 kHz apart.

We have used:  
gamma_t	= 2.355 
alpha_p = 0.18 

Carsten and Kristian changed (18:00) the thresholds of PMT north and PMT middle in the ESR cave. 
See picture below. The effect is negligible. 


Carsten will now (18:05) change the channel of the pre-amp of PMT north. 

We noted that the dark countrate of PMT north is about 20x higher than that of PMT middle. 

We went into the ESR cave to look for stray light. 
We decided to put a black cloth over all the PMTs. 
Also we made the tubes of the N2 airflow to the PMTs black (tape around). 
This did not make a significant change. 

We exchanged PMT north (same type 9423B) to see if that made a difference. 
It did not really change either. 

PMT north = 2650 V 
PMT middle = 2700 V 

The first picture below shows the dark rates for these two voltages. 

At about 17:00 we changed the voltage of PMT north to 2700 V. 
This did not change anything. 


Carsten swapped the cables of PMT north and PMt middle (inside ESR, before the amps) at 17:14.
The second picture below shows the result of that. 
Now black and red are exchanged. 


Carsten swapped the cables back again (17:20). 
Carsten and Kristian will look at the PMT signals in the ESR cave. 

We checked the timing (before the start of the measurement cycle documented below).
Timing and measurement window are attached.

[TABLE border="1"]
Time | Part. Det. Int | SIS-intensity| accumulations in ESR |  cooler-HV PTB K250 |  cooler-HV PTB red | cooler-HV orange | LMD-DAQ1 Files | LMD-DAQ2 Files | scan range(nm) | number of positions | dwell time (laser shots) | n loops | checked laser position | comments |-
22:16 | 4800 | 2e9 | 30 | 104525 | - | - | 300 | 327 | 548.51 - 548.01 | 201 | 15 | 2 | yes | only few ions, did not start Go4 |-
22:28 | 9000 | 2e9 | 15 | 104525 | - | - | 301 | 328 | 548.51 - 548.01 | 201 | 15 | 2 | yes | After this run: Shaky SIS intensity, cathode is being changed |-
22:53 | 7000 | 2e9 | 35 | 104525 | - | - | 302 | 329 | 548.51 - 548.01 | 201 | 15 | 2 | yes |-|-
[/TABLE] 
23:20 Failure of GE01KP04, GE01KP05, GE01KP22 (or GE01KP24) devices in the ESR.
Problems with gtemu3-hick (??) , take injections since 
01:49 Bernd tried to make things work by switching off and on some of the dipole correction coils. He was even able to get a quite good intensity by leaving one of the coils switched off (although with a slight shift of frequencies visible in Schottky spectrum) but then the ESR electron cooler has failed probably due to problems with the cooling water. So, the decision was taken to stop the measurement at this point. The laser was switched off.

The data of DAQ1 are stored in the following directory and with the following filenames

open file /data.local2/2025_229Th/2025_229ThDAQ1_ -auto -rfio 
(from @openfile)

The usual @connectdisk, @openfile @closefile are adapted and can be used.

The WDBook RAID0 disk is attached for backup of the data

/media/atplaser/WDBook2/2025E0052daq1

On the NTCAP the directory is changed to 
Q:/E0052