1:25 a.m. huge drop in UV laser power -> small crystal bump with both y screws of bbo oven
Settings für Ekühler an und aus in SC4 und 5
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.
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 ?!
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