1.) ion lasser overlap and scraper test

2.) change bunching frequency to middle of ecooled coasting beam

3.) long time measurements see labbook HKR
3.1) try ecooler on/off ; bunch on / off ; laser fixed on / off ; laser scanning on / off ; try different bunching amplitudes (MAX :LEV 0.25V) ; try other h = 10, 7, etc...
3.2) Dont forget to plug in the schottky trigger -> maybe change acquisition and analysis time if needed

4.) XUV detector tests
4.1.) laser - bunch timing by checking xuv anode signal

~30 min downtime

--> LASER ADJUSTEMENTS!

1:25 a.m. huge drop in UV laser power
-> small crystal bump with both y screws of bbo oven

To reduce the load on the VUPROM TDC, we unplugged the TDC inputs for the front and back signals of the MCP of the XUV detector.
The Anode signal is still plugged in and should be sufficient for the analysis.

carbon main vi - kopie is now in operation

here, in keysight.vi the input settings for the new impedence for the multimeter are now hopefully correct --> THIS SHOULD BE CHECKED IF THE RING IS OPEN 

Ion frequency shifts with laser, both manually and scanned, without bunches: successful
Bunching with 7 and 20 bunches: successful
Tried laser scans with bunches: unsuccessful
Manual laser scans with bunches: successful

In this shift a number of successful Schottky measurements were done:
With fixed laser wavelength, while varying the wavelength, with different bunching and more (see logfile 1 for more info: line 53 to at least 107).
The detector software sometimes files to change the current of the power supplies, if this happens a simple restart of the GUI fixes the problem.
Once in this shift the Mesytek in the laser lab turned itself (?) off and the background rate increased. Hopefully this was a single event.

Rate was very low: ~ 100Hz
Adjusted Walk level and Threshold, new rate: 5kHz
Additionally, parameters of the detector were varied for optimization but were returned to default afterwards.

25,82556 MHz
h = 20

frev = 1,2912735 MHz

I just heard that the ESR vacuum is quite bad. 
There was a small vacuum problem a while ago, it was sealed, but apparently the pressure is not as low as usual.

Markus Steck said that the beam lifetime is only 15 - 20 seconds !!! 

This will seriously complicate some of our test experiments :( 

During the night shift we saw several rises of the fluorescence (see another entry) and also energetic overlap in coasting beam modus.
Here the laser wavelength was stabilized @ 1028,967nm and electron cooler was switched off because of some fluctuations which we saw in the schottky.
Left part of the schottky picture shows the c3+ beam, the right part is the o4+ contamination.

Schottky frequency (189th harmonic) = 244.033662 MHz

revolution frequency  frev = 1.2911834 MHz

bunching frequency h=2  --> fb = 2.582367 MHz
bunching frequency h=10  --> fb = 12.911834 MHz

The power in the ESR is off. 
(also on the gas-target area on top of ESR)
Electrical engineers are trying to find and fix the problem. 

The ion beam moves around, pretty arbitrary. See picture. 
ESR crew believes that it is not due to fluctuations in the HV of the E-Cooler. 

looks like the E-Cooler is responsible for this. If one turns off the electron current, the beam stays stable. 
M.Steck is informed.

> The ion beam moves around, pretty arbitrary. See picture. 
> ESR crew believes that it is not due to fluctuations in the HV of the E-Cooler. 

Because the C3+ part of the ion beam is properly bunched, it is no longer so sensitive to the drifts caused by the e-cooler. 
In the O4+ part of the ion beam these drifts can still be seen.