 Wed May 12 10:15:47 2021, Volker Hannen, DAQ, Unplugged TDC inputs for MCP front and back
|
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. |
|
Fri May 14 04:50:46 2021, Team #Night, General, Scraper Tests Ion / Laser Beam
|
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 ?! |
|
Fri May 14 06:34:45 2021, Team #Night, Analysis, DSG821 IP
|
140.181.104.108 |
|
Fri May 14 06:35:55 2021, Team #Night, General, Adjustment of Laser
|
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 |
|
Fri May 14 07:20:18 2021, Team #Night, General, actual bunching frequency
|
25,82556 MHz
h = 20 |
|
Fri May 14 07:33:42 2021, Team #Night, General, ecooler central frequency shifted relative to bunch central frequency
|
|
Fri May 14 01:34:44 2021, Team, General, strange XUV Anode signal 
|
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 |
|
Fri May 14 22:04:25 2021, Team, Accelerator, ESR OPEN ; NO BEAM -> Reset cooling device
|
we had to open the ESR to reset a cooling device |
|
Fri May 14 22:20:37 2021, Team, Accelerator, ESR Closed - BEAM #ON!
|
|
|
Sat May 15 03:39:16 2021, Team, General, actual revolution frequency
|
frev = 1,2912735 MHz |
|
Sat May 15 09:50:31 2021, Team, Runs, Laser cooling of....
|
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. :) |
|
Sun May 16 02:28:21 2021, Team, General, #Beam ON!
|
Laser specs:
pulse length -> 482ps
~75mW UV Power inside ESR (depending on laser wavelength) |
|
Sun May 16 05:09:04 2021, Team, General, Laser cooling with 482ps
|
we see laser cooling with 482ps pulse length |
|
Sun May 16 05:09:27 2021, Team, General, Switch to 285ps
|
pulse length -> 285ps
minimum 62mW inside ESR (depending on laser wavelength) |
|
Sun May 16 05:24:00 2021, Team, General, Laser cooling with 285ps
|
we also see laser cooling with 285ps pulse length |
|
Sun May 16 06:13:46 2021, Team, General, Switch to 166ps
|
|
|
Sun May 16 07:03:07 2021, Team, General, Laser cooling with 166ps
|
We saw some indications of laser cooling @ 166ps pulse length |
|
Sun May 16 21:23:02 2021, Team, General, ESR OPEN -> preparation for Polarisation Tests
|
|
|
Sun May 16 22:11:49 2021, Team, General, Laser Polarisation values
|
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 |
|
Mon May 17 08:05:42 2021, Team, General, End of beamtime
|
~ 8 a.m. |