• Concentration Resonator: 0.16 g/l
  
• Concentration Amplifier: 0,02 g/l
  

• Total measurement window: 600 001 ms (10 min + 1ms)
  
• COOL: 16800 us
  
• MEAS0 / MEAS1 : 16800us
  
• Ramp phase delay: 3000 us
  
• Voltage MEAS0 (MAX of F=4 Peak) : 3348V
  
• Voltage MEAS1 (MAX of F=4 Peak) : 3243V
  
• Voltage COOL: -900V
  

[1] 5500 us
[2] 2000 us
[3] 2200 us
[4] 2400 us
[5] 200 us (not connected)
[6] 200 us (not connected)
[7] 200 us (not connected)

The pump laser is broken!

To be more specific the YAG crystal looks cracked (see att.) and we don't have a spare one.
First thing tomorrow morning we will call InnoLas and ask if they can repair it before the weekend.
If not, Rodolfo will install the old Quanta Ray laser for the remaining beamtime.

Switched to bunching: Ring HF Bucket_fill(RF_manipulation)(SC7,BP2) changed from [3.0, 0.0] -> [3.0, 3.0]
Injections 5 | Breeding 30

DR scan and HV Calibration against Schottky frequency (NTCAP).
Since DR measurements are presently running with DC beam we can easily do a calibration of cooler voltage against Schottky frequency at the end of the DR scan.

When the DR scan is finished, the beam is dragged to the 900V too high cooler voltage.

In manipulation machine we change the cooler voltage in steps of 100 V and measure it. The according Schottky data of the single line are in the NTCAP directory: IQ_2025-05-15_23-46-52 (IQ_2025-05-16_00-26-37)
DR run file run0060.lmd 

We do 20 injections, and 75 times 10s cooling/breeding

In the end we measured the revolution frequency as a function of the correction in the electron cooler HV GECEBG1E (Delta Uacc) Paramodi folder ESR Manipulation


all values at I_el = 300mA
[TABLE border="1"] 
Voltage correction | PTB 3.2 / V | PTB 3.3 / V | Ohmlabs / V| Revolution frequency / MHz |-
 880 | 205826 | 205827 | 205820 | 1,940625 |-
 980 | 205926 | 205927 | 205919 |  |-
 880 | 205826 | 205827 | 205820 | 1,940625 |-
 780 | 205727 | 205927 | 205919 |  |-
 680 | 205626 | 205927 | 205919 |  |-
 580 | 205527 | 205927 | 205919 |  |-
 480 | 205427 | 205927 | 205919 |  |-
 380 | 205326 | 205927 | 205919 |  |-
 280 | 205226 | 205927 | 205919 |  |-
 180 | 205126 | 205927 | 205919 |  |-
 080 | 205026 | 205927 | 205919 |  |-
 -20 | 204926 | 205927 | 205919 |  |-
-120 | 204826 | 205927 | 205919 |

[/TABLE]

[TABLE border="1"] 
Voltage correction | PTB 3.2 / V | I_el / mA |-
-20 | 204910 | 200 |-
-20 | 204893 | 100 |-
-20 | 204909 | 200 |-
-20 | 204926 | 300 |-
-20 | 204942 | 400 |-
-20 | 204959 | 500 |-
-20 | 204926 | 300 

[/TABLE]

Move back to standard settings
Voltage correction = 880V | PTB 3.2 = 205826V | I_el = 300mA

1:27 NTCAP stop close file

1kHz read out trigger NTCAP

DC Trafo --> B1 SRC1
U Cooler --> B1 SRC3
I Cooler --> B1 SRC4
P Gun    --> B1 SRC5

After some minor adjustments for the laser done by Rodolfo, the laser is back 
at ESR and visible by the PD-SO.
We checked the timing between the cooling signal of the e-cooler and the 
signal produced of the PD-SO, which is suppose to be at the end of the 
cooling ramp - seems to work as expected. Picture is attached.

Note added (Carsten): The "cool" signal is generated by the microcontroller. It 
is only in sync if the laser signal is put on the input line to the microcontroller. 
Otherwise both have independent clocks.

The scan range according to Wilfried should be

593.15 nm - 592.55 nm

with the resonance at 592.85 nm

We adjusted the delay of the laser according to the signal of the PD and the PMTs.