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.
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 ?!
140.181.104.108
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
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
we had to open the ESR to reset a cooling device
frev = 1,2912735 MHz
H=2 H=7 H=10 H=20 H=30 We performed several scans: Close to the bucket middle Over the bucket Over the bucket, jumped to the "red side" of the bucket and captured and cooled the beam again. Laser settings: 7 times revolution frequency and 740ps pulses - - > 3.4 +/- 1.2 GHz Still to do: Switch to 240ps pulses - - > 5.8GHz +/-1.3 GHz Maybe: Switch to 117ps pulses - - > 11.0 +/- 0.8 GHz BUT here we have less laser power (max. 50 mW right after BBO crystal, so maybe only 30 mW at the laser-ion overlap) available. Maybe we are lucky and it is enough to cool also the ion beam. :)
Laser specs: pulse length -> 482ps ~75mW UV Power inside ESR (depending on laser wavelength)
we see laser cooling with 482ps pulse length
pulse length -> 285ps minimum 62mW inside ESR (depending on laser wavelength)
we also see laser cooling with 285ps pulse length
We saw some indications of laser cooling @ 166ps pulse length
maximal transmission of PBSC (257/514 pbsc was used in combination with xlp12 detector and visual on a screen): L/4 @ 276° & L/2 @ 348° --> p-polarized light L/4 gleich auf 276° & L/2 auf ~19° --> s-polarized light current position 22:15 p.m. now we have some fun ! :D
~ 8 a.m.