Lifetime still is short

If the laser controller is locked up again, the little display will show an error message after an attempted medusa scan.
To restart it, follow these steps:
1.) Unlock the beam stabilization.
2.) shut down medusa and the wavemeter software
3.) Turn off the 2 laser stages
4.) Close the shutter of the pumping laser
5.) Turn off and on the power button of the pulsed laser inside of the black box of the pump laser insertion.

To start again go back through the list.

When the ion pumps and vacuum gauges are switched off the scaler data of 
PMT_south, PMT_middle, PMT_north, PD_NO, PD_SO, PartDet North, PartDet South and (Channeltron) should be checked without voltages applied in dependence on the CFD thresholds to determine the "cable noise level" at which thre are NO entries other than 0 in hte spectra (minimum background).

Same for 2nd DAQ and Mesytec MSCF16

To realize the shortest bunches possible, we check the bunch length as a function of two different bunching amplitudes. With the bucket fill set to 1.0 we observe the spectra compiled in attachment 1. The second attachment is recorded with a bucket fill 0f 0.2.

For an RF amplitude of 0.2 we do not observe bunches any more but a coasting beam. In the shottky spectrum we can resolve a shift of the signal and thereby adjust the electron cooler voltage to the bunching frequency to within 1 V.

U_e-cooler = -104410 V
I_e-cooler = 80 mA

What is the ion beam lifetime, according to the DCCT and Schottky? 
Can somebody measure it, please? 
Yesterday we could not see a fast drop in the "main" beam. 

Because the lifetime that is mentioned here is the one based on the particle detector and on the PMT countrate. 
If what is seen now is "only" some fast decaying component inside the beam, we could simply wait for its decay and then continue with the real measurement. 

It seems to be that there are some problems with the injections in the ESR.
The last 2 accumulation cycles showed that wheter only a small amount of ions are injected into the ESR or the injection is missing.

Photos of the last 2 accumulation cycles are attached.

We ask if there are some problems with the ESR or with the SIS18, because the particle number in the SIS18 is also decreasing... 

data:
(env_OnlineDataAnalysisSystem) litv-exp@lxbk0497:/lustre/astrum/experiment_data/2024-05_E018/OnlineDataAnalysisSystem/data/iq/IQ_2024-06-
12_21-47-54$
The root file is at:
(env_OnlineDataAnalysisSystem) litv-exp@lxbk0497:/lustre/astrum/experiment_data/2024-05_E018/OnlineDataAnalysisSystem/data/iq/IQ_2024-06-
12_21-47-54$ root filtered_spectrum_670_750.root

The figure below shows the interface of the program "combine_injection". You can combine any tdms file with this program. To run this 
program, you need to log in to the server /luster/astrum/, and activate the conda environment. Then type the command "combine_injection" at 
the terminal. You will see the interface. 

• The UV LED does not give a useful signal for the small-band VUV PMTs.
  
• In general, (using the new cables?) it seems that the cable noise is very low and can be easily discriminated.
  
• PMT south (the broadband) sees a regular "strong" pulse-train/burst of photon signals. Therefore, the PMT was exchanged against a different one (SolarBlind ET Enterprises Model 9422, SN1042) - same result. New data sheet is attached.
  
• The channeltron has a rather broad pulse height distribution but very low background. CFD thresholds can easily be set. Very likely the best detector to adjust the laser timing?
  
• Channeltron Head : -2.5 kV , CFD threshold 8 mV.
  
• PD SO threshold needs to be checked (in Go4 the number of counts of PD SO is much lower than of PD NO). Present values: both 10 mV.
  
• Voltage PMT north / middle (both small-band) : -2600V, PMT south (replacement): -1500V. All thresholds: 15 mV
  
• CAEN CFD must be switched back to LOCK or it otherwise produces additional background
  

Fcenter - 244.6 MHz
BW - 10 MHz