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