• 3 Loops
  
• 501 Steps
  
• 15 Shots / Step
  
• From 550.4 nm to 547.9 nm. In total 2.5 nm @ 0.005 nm
  

[1] 242.27986 MHz
[2] 242.82623 MHz + 27.5 kHz
[3] 242.853 MHz + 54.375 kHz 229Th
[4] 242.878 MHz + 79.375 kHz
[5] 242.936 MHz + 137.5 kHz
[6] 242.959 MHz + 160 kHz
[7] 242.982 MHz + 183.75 kHz

[1] 243.6925 MHz
[2] 243.72213 MHz + 29.6 kHz
[3] 243.750 MHz + 57.375 kHz 229Th --- Reference on Schottky scope
[4] 243.7768 MHz + 84. kHz
[5] 243.8376 MHz + 145 kHz
[6] 243.863 MHz + 170.6 kHz
[7] 243.687 MHz + 194.625 kHz

I have prepared new (fresh) dye solutions of Fluorescein 27: 2 charges. They are in the Safety Cabinet (Sicherheitsschrank) in the ESR Laser lab

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 

For PID with rionid we used: 
- LISE file from last year (attached.
- .npz file from 410 RSA (attached).

Apparentlty did not work yesterday evening (no signal), but looks fine now (see attachment)

Pulses on photodiodes in entry 20 

1. seem wide, so we also looked at qswitch signal; also seemes wide.
2. Have a tail

1.:

We investigated this and came to the conclusion, that the CFD is the issue:
- On an oscilloscope, when looking at both HF signal (CFD input) and CFD output, there is a 2ns jitter.
- The same jitter is visible when looking at the CFD output when triggering on a freq. generator signal with same frequency and amplitude as HF signal (1.54263 MHz; 1V peak to peak).
- There is not significant jitter when comparing the CFD output and the qswitch signal

We tried differents CFD (also a leading edge CFD / different thresholds), but this did not significantly improve what we saw on the oscilloscope.
Applying a 10MHz filter to the HF signal only made the jitter worse.
There might be an option to get a logic (NIM) signal from ESR instead of the sin-signal
Alternatively, one could think about using a PLL.
Note: the 2ns might also be limited by the trigger of the oscilloscope. We saw that if the trigger of the oscilloscope is not on the steepest part of the HF signal, the jitter "gets worse".

2.:

We saw on the qswtich signal, that there are instances, when  the q-switch signal is too early; 
Ww will try to find out which NIM module between the CFD and the final qswitch signal causes this
Preliminary: It's coincidance crate

UV power was not stable but dropping from ~18 mW to 13 mW after opening COBRA shutters.
New calibration of frequency conversion unit:

Wavelength/nm       Position/Steps
554,0001            383029
553,0000            386604
552,0001            390229
551,0000            393954
550,0001            397679
549,0001            401404
548,0001            405104
547,0001            408829

now stable at ~19-20 mJ depending on wavelength

Table of dataset: Attachement 1
Plot of dataset: Attachement 2

We recognized that the output power of the pump laser was instable when externally triggered with 200kHz (stand-bye frequency of ESR). Therefore, we changed the coarse timing offset of the pockels cell trigger compared to the flash lamp pulse from 215µs to 219.9µs. 
Thereby, the output power increased from ~600mJ to 620mJ, and the PTP stability improved from 15% to 10%. The RMS stability improved from 2% to 1.2 %. With these settings we had UV pulse energies of 20mJ.

• ECEDS1VU: Verriegelt mit ECEDS1HA. Der Antrieb kann nur fahren
  wenn der Antrieb ECEDS1HA in Position -4,0 steht.
  
  
• ECEDS1HA: Verriegelt mit ECEDS1VU. Der Antrieb kann nur fahren
  wenn der Antrieb ECEDS1VU in Stellung EI steht.
  
  
• ECEDS2VU: Verriegelt mit ECEDS2HA. Der Antrieb kann nur fahren
  wenn der Antrieb ECEDS2HA in Position 0,0 steht.
  
  
• ECEDS2HA: Verriegelt mit ECEDS2VU. Der Antrieb kann nur fahren
  wenn der Antrieb ECEDS2VU in Stellung EI steht.
  

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