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ID Date Author Category Subject Text   85   Tue May 31 07:29:11 2022 Ken Detectors XUV-Detektor Rate was very low: ~ 100Hz Adjusted Walk level and Threshold, new rate: 5kHz      84   Mon May 17 21:43:56 2021 Danyal General The test beamtime was a success. Dear all, The test beamtime is now over.       83   Mon May 17 08:05:42 2021 Team General End of beamtime ~ 8 a.m.      82   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):      81   Sun May 16 21:23:02 2021 Team General ESR OPEN -> preparation for Polarisation Tests        80   Sun May 16 11:29:22 2021 Benedikt General Automated laser scans working The automated laser scans are working now. We can now scan with the following functions: triangle, sawtooth, cosinus/sinus, arctan,      79   Sun May 16 07:18:56 2021 Night Shift Sebastian/Max/Noah General Preparation for automated laser scans We shut the laser system down to prepare automated laser scans      78   Sun May 16 07:03:07 2021 Team General Laser cooling with 166ps We saw some indications of laser cooling @ 166ps pulse length      77   Sun May 16 06:13:46 2021 Team General Switch to 166ps        76   Sun May 16 05:24:00 2021 Team General Laser cooling with 285ps we also see laser cooling with 285ps pulse length      75   Sun May 16 05:09:27 2021 Team General Switch to 285ps pulse length -> 285ps minimum 62mW inside ESR (depending on laser      74   Sun May 16 05:09:04 2021 Team General Laser cooling with 482ps we see laser cooling with 482ps pulse length      73   Sun May 16 02:28:21 2021 Team General #Beam ON! Laser specs: pulse length -> 482ps      72   Sun May 16 02:22:19 2021 Sebastian General "Der Laser ist ok"        Draft   Sun May 16 02:20:58 2021 Sebastian General "Der Laser ist (wieder) ok"        70   Sun May 16 02:18:53 2021 Sebastian General UV Drop 1:25 a.m. huge drop in UV laser power -> small crystal bump with both y screws of bbo oven      69   Sat May 15 12:11:54 2021 Benedikt General Laser-bunch-timing Optimizing the laser bunch timing. h = 7 (9.0389145 MHz) Reprate is already set to same frequency.      68   Sat May 15 11:26:44 2021 Benedikt General TEM parameters We changed the horizontal position of the laser beam a bit, so that we maximized the fluorescence signal on the XUV detector (coasting      67   Sat May 15 11:06:31 2021 Benedikt General New Zoom link for the moment https://tu-darmstadt.zoom.us/j/4948400422?pwd=SEJaUzBuYXM0TTd6UWxoZTFlWEZxUT09 Meeting ID: 494 840 0422      66   Sat May 15 09:57:24 2021 Dayshift Runs Currently on schedule Enhance fluorescence rate and perform  laser bunch timing       65   Sat May 15 09:50:31 2021 Team Runs Laser cooling of.... H=2 H=7 H=10      64   Sat May 15 09:23:52 2021 Sebastian Accelerator Ekühler Tab "Kühler Elektronenstrahl" An Gerät schicken      63   Sat May 15 09:22:41 2021 Sebastian Accelerator Ekühler Settings für Ekühler an und aus in SC4 und 5      62   Sat May 15 06:51:16 2021 Night Shift Sebastian/Max/Noah General Different Laserscantypes We use different scan types (manual scan) or constant laser wavelengths to check the effects of laser cooling in the Schottky      61   Sat May 15 03:39:16 2021 Team General actual revolution frequency frev = 1,2912735 MHz      60   Fri May 14 22:20:37 2021 Team Accelerator ESR Closed - BEAM #ON!        59   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      58   Fri May 14 21:43:40 2021 Sebastian General "problems accelerator" There are cooling problems of some accelerator devices short break, hopefully :)      57   Fri May 14 16:37:01 2021 Benedikt General Status update 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      56   Fri May 14 11:01:33 2021 Benedikt Calibration Laser Beam adjusted The laser beam was adjusted in his position to overlap better with the ions.      55   Fri May 14 09:40:04 2021 Nightshift Runs Ecooling vs laser wavelength shift, coasting beam, laser stronger than Ecooling Last three pictures where taken after  first laser ion beam overlap adjustments      54   Fri May 14 09:38:43 2021 Nightshift Runs Coasting beam, ecooler on, scanning laser        53   Fri May 14 09:38:04 2021 Nightshift Runs Coasting beam, scanning laser, ecooler on        Draft   Fri May 14 09:35:20 2021 Nightshift Runs Coasting beam, scanning laser, ecooler on        51   Fri May 14 09:00:55 2021 Sebastian General UNILAC Problems ~30 min downtime --> LASER ADJUSTEMENTS!      50   Fri May 14 08:55:53 2021 Sebastian General ToDO 14.5 ...so far 1.) ion lasser overlap and scraper test 2.) change bunching frequency to middle of      Draft   Fri May 14 07:33:42 2021 Team #Night General ecooler central frequency shifted relative to bunch central frequency        48   Fri May 14 07:20:18 2021 Team #Night General actual bunching frequency 25,82556 MHz h = 20      47   Fri May 14 06:35:55 2021 Team #Night General Adjustment of Laser we increased the height of the laser beam TEM Settings      46   Fri May 14 06:34:45 2021 Team #Night Analysis DSG821 IP 140.181.104.108      45   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      44   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.      43   Fri May 14 01:28:04 2021 Sebastian General "new" laser wavelength Minor changes in electron cooler voltage (~+13V, now 66903V measured by DMM) leads to that we had to shift the laser wavelength to:      42   Thu May 13 23:42:37 2021 Ken Ueberholz General What was done In this shift a number of successful Schottky measurements were done: With fixed laser wavelength, while varying      41   Thu May 13 21:00:48 2021 Benedikt General New reprate of the UV laser The lasersystem now operates at a reparte of 9.038946 MHz. This is 7 times f_rev (see previous post).      40   Thu May 13 20:18:10 2021 Benedikt General New f_rev The ions were changed to a different speed today at 2 PM. The new revolution frequency is now 1.291278 MHz.      39   Thu May 13 18:34:54 2021 Ken Ueberholz General What happened scince shift change at 4pm Ion frequency shifts with laser, both manually and scanned, without bunches: successful Bunching with 7 and 20 bunches: successful      38   Thu May 13 03:35:25 2021 Lars General Status: Current schedule ... so far 1.) so far:  h = 2, 4, 6, 7, 8, 10, 12, 14, 16, 18, 20, 30      37   Thu May 13 02:45:29 2021 Sebastian Analysis ESR pressure    8x    36   Thu May 13 02:42:58 2021 Sebastian General Lasershutter ESR Entrance?! attached should be the name of the entrance laser shutter. just in case somebody will close it ;)      35   Thu May 13 01:55:15 2021 Sebastian General ESR amplifier reset / laser check we had to go into the ESR because the amplifiers hooked up. both amplifiers were resetted!      34   Thu May 13 01:21:30 2021 Sebastian General Current schedule ... so far 1.) check h=2,4,6,7,8,10 .... bunching frequencies with different amplitudes (signalgenerator), Ecooler ON, Laser OFF --> record schottky      33   Thu May 13 01:13:06 2021 Sebastian General Bunching frequencies relating to Danyals ID 25 post are the current bunching frequencies:      32   Thu May 13 01:05:45 2021 Danyal DAQ more stability by bunching 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.       31   Thu May 13 01:01:27 2021 Danyal DAQ bunched ion beam        30   Thu May 13 00:58:53 2021 Danyal DAQ unbunched ion beam        29   Wed May 12 23:45:23 2021 Ken Ueberholz General Laser does not reach the exit window High rates on the detector at 50mm positions, laser does not seem to reach the exit window.      28   Wed May 12 23:36:18 2021 Ken Ueberholz DAQ VI change carbon main vi - kopie is now in operation here, in keysight.vi the input settings for      27   Wed May 12 22:57:41 2021 Sebastian General Laser Reprate laser reprate is seven times the revoolution frequency: 9.038283 MHz pulse length: 735ps      26   Wed May 12 22:48:25 2021 Sebastian General DSG Control SCPI Commands Open Ultra Sigma Press LAN Press Search, after a while the whole rigol      25   Wed May 12 22:35:33 2021 Danyal General frev and fb Schottky frequency (189th harmonic) = 244.033662 MHz      24   Wed May 12 22:28:55 2021 Ken Ueberholz General Bunching succesfull Bunching with 2 and 10 bunches succesfull      23   Wed May 12 19:48:24 2021 Sebastian General DSG821 Network To implement the bunch Signal Generator (DSG821 inside ESR) you have to:      22   Wed May 12 18:59:15 2021 Ken Ueberholz General Power is back Power is back and most things are running again      21   Wed May 12 15:36:04 2021 Danyal Accelerator general power failure in ESR! (everything is off) The power in the ESR is off.  (also on the gas-target area on top of ESR) Electrical engineers are trying to find and      20   Wed May 12 13:11:58 2021 Danyal Accelerator short break between 13:30 and 15:30 There will be a short break (2 hours) this afternoon. Between 13:30 and 15:30.  The so-calles "super lense" in the UNILAC      19   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.      18   Wed May 12 10:14:18 2021 Lars Accelerator E-Cooler M.Steck et al. discussed about the E-Cooler and found a possible issue. They asked for enterance to the ESR. Since nobody else was      17   Wed May 12 09:59:08 2021 Benedikt General Rigol DSG821 signal generator settings        16   Wed May 12 09:09:15 2021 Sebastian DAQ Fluorescence fluorescence with detector in parking position fixed laser wavelength electron cooling ON,       Draft   Wed May 12 09:05:48 2021 Keysight Settings DAQ          14   Wed May 12 09:04:48 2021 Sebastian DAQ Keysight AUtoCal        13   Wed May 12 08:42:49 2021 Sebastian Analysis Laser scans / coastig beam / no ecooler Attached you'll see a first laser scan of ~100GHz in the UV.      12   Wed May 12 08:41:36 2021 Sebastian Analysis Laser stability During night shift the laser was very stable! Only minor fluctuations occured in the UV      11   Wed May 12 08:32:04 2021 Sebastian Analysis fluorescence & energetic overlap During the night shift we saw several rises of the fluorescence (see another entry) and also energetic overlap in coasting beam modus.      10   Wed May 12 08:10:17 2021 Lars General instabilities in ion frequency looks like the E-Cooler is responsible for this. If one turns off the electron current, the beam stays stable.       8   Wed May 12 02:34:29 2021 Danyal General instabilities in ion frequency The ion beam moves around, pretty arbitrary. See picture.  ESR crew believes that it is not due to fluctuations      Draft   Wed May 12 02:16:25 2021 Danyal, Lars Accelerator Ion beam position Laser Position with scrapers verified.  1HA: impossible to scratch laser beam, still there at -1.0 mm      6   Tue May 11 20:14:43 2021 Danyal General bad ESR vacuum I just heard that the ESR vacuum is quite bad.  There was a small vacuum problem a while      5   Tue May 11 18:29:35 2021 Danyal General first ions in the ESR        4   Tue May 11 16:33:31 2021 Ken Ueberholz Detectors Detector control manual Attached to this elog entry is a short manual for the xuv-detector control. If anything is missing or not understandable I can change      3   Tue May 11 16:07:59 2021 Sebastian DAQ DAQ Manual Attached you'll find a short manual for operating the whole DAQ system      2   Tue May 11 15:49:30 2021 Danyal General setting up ESR The operators are still busy extracting the beam from the SIS18 towards the ESR and injecting it into the ESR.       1   Mon May 10 07:58:13 2021 Danyal General Telephone numbers and Zoom link Telephone numbers: ESR laser lab: +49 (0)6159 71 - 2882

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