1.) check h=2,4,6,7,8,10 .... bunching frequencies with different amplitudes (signalgenerator), Ecooler ON, Laser OFF --> record schottky and "normal" DAQ

2.) Ecooler ON, Bunching ON, Laser ON (wavelength fixed and/or scanned)

2.1) Do we see the laser in the Schottky? (The laser has to be on the right side of the bunches and act as a barrier to damp the oscillation of the ions inside the buckets.) 
If not change laser wavelength until we see the laser in the schottky 

2.2) Do we see fluorescence in the XUV Detector signal? Weak fluorescence signal --> check laser-bunch timing by varying the lead delay until we see the highest fluorescence signal. 
If we see no fluorescence signal change laser wavelength until we see fluorescence from the xuv anode signal.

3.) Do we see that some sidebands vanish in the schottky? Does the lifetime of the ion beam increase?
3.1.) If not "play" with Laserparameters, scans, delays, etc...

we had to go into the ESR because the amplifiers hooked up. both amplifiers were resetted!

we also checked why we didnt see the laser at the exit window.
Laser Shutter @ the exit is closed......................... E02VVLF2t needs to be opened!

attached should be the name of the entrance laser shutter. just in case somebody will close it ;)

1.) so far: 
h = 2, 4, 6, 7, 8, 10, 12, 14, 16, 18, 20, 30
Amplitudes: (10, 50, 100, 150, 200, 250) mV

now we will try to use the laser-toy ;-)


> 1.) check h=2,4,6,7,8,10 .... bunching frequencies with different amplitudes (signalgenerator), Ecooler ON, Laser OFF --> record schottky and "normal" DAQ
> 
> 2.) Ecooler ON, Bunching ON, Laser ON (wavelength fixed and/or scanned)
> 
> 2.1) Do we see the laser in the Schottky? (The laser has to be on the right side of the bunches and act as a barrier to damp the oscillation of the ions inside the buckets.) 
> If not change laser wavelength until we see the laser in the schottky 
> 
> 2.2) Do we see fluorescence in the XUV Detector signal? Weak fluorescence signal --> check laser-bunch timing by varying the lead delay until we see the highest fluorescence signal. 
> If we see no fluorescence signal change laser wavelength until we see fluorescence from the xuv anode signal.
> 
> 3.) Do we see that some sidebands vanish in the schottky? Does the lifetime of the ion beam increase?
> 3.1.) If not "play" with Laserparameters, scans, delays, etc...

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

The ions were changed to a different speed today at 2 PM. The new revolution frequency is now 1.291278 MHz.

The lasersystem now operates at a reparte of 9.038946 MHz. This is 7 times f_rev (see previous post).

In the future, the laser-bunch-timing can be adjusted.

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.

Minor changes in electron cooler voltage (~+13V, now 66903V measured by DMM) leads to that we had to shift the laser wavelength to:

1028,965nm 

to see an increase of the countrate of the XUV ANODE Signal.

electron cooler ON
electron cooler current (SET 120mA, HKR "measured" 102mA)
bunched beam, h=20

We see a strange behavior of the anode signal when we bunch the ion beam and electron cooler is on.

peak structure... ---> we play now with the bunching amplitude 

200mV
150mV
100mV ---> Peaks higher?

see attached file

laser is 4-6mm below the ion beam.
It could be that the interaction between both beams came only from the interaction between the laser halo with the ion beam ?!

we increased the height of the laser beam

TEM Settings
OffsM Ay -0,07
OffsM By -0,35

1VO scratches 6
2VO scratches 3-4

25,82556 MHz
h = 20

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!

Right now, we have to adjust the ion beam a bit to overlap better with the laser beam.
We keep the laser wavelength at resonance with the ions and try to optimize the fluorescence signal on the XUV detector while moving the ion beam.

There are cooling problems of some accelerator devices
short break, hopefully :)
Laser is switched of for some rest

frev = 1,2912735 MHz

We use different scan types (manual scan) or constant laser wavelengths to check the effects of laser cooling in the Schottky diagrams (fluorescence can not be seen in the detector), for different bunching amplitudes and frequencies:
- Scan from 1028.950 -> 1028.940, stepsize 0.001 every 10 sec
- Scan from 1028.950 -> 1028.930, stepsize 0.001 every 5 sec
- Scan from 1028.950 -> 1028.940 -> 1029.950, stepsize 0.001 every 5 sec
- Scan from 1028.950 -> 1028.940, stepsize 0.0005 "as fast as possible" 
- constant wavelengths around 1028.940
- Scan to wavelengths < 1028.940 (heating) -> Jump to 1028.945 and fast scan back to 1028.940 (-> cooling)

The cooling effects of the laser can be observed well in the Schottky spectra :)