Shift summary, posted by Jan-Etienne Pudell on 06 May 2023, 02:19
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- We get stable x-ray delivery with 130µJ.
- We could move the detector succesfully in and out of the LFoV configuration! |
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Shift summary, posted by Jan-Etienne Pudell on 07 May 2023, 02:23
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We had stable x-ray delivery with 120µJ and up to 300 pulses.
Successful user data acquisition of water and water+THF samples at various supercooled states |
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Shift summary, posted by Jan-Etienne Pudell on 08 May 2023, 02:38
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Stable beam delivery with 23keV and 140µJ at 2.2, 1.1 and 0.55MHz
User data acquisition during the day interrupted by storage and detector DAQ problems: |
Issue, posted by Jan Gruenert on 16 Jan 2023, 19:50 
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Problem: Beam operation in SASE2 is prohibited by SEPS / MPS
Origin of problem: HED-CRL3
(this was already an issue during the past weekend) |
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Issue, posted by Jan Gruenert on 17 Jan 2023, 10:25
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SASE3 peration issue - SOLVED
Controls issue, the machine cannot make beam in SASE3.
From
BKR / DOOCS the problem description is: Big Brother is blocking SASE3 beam due to an EPS power limit of 0 Watt.
Looking into the SASE3 karabo topic, many devices are not instantiated, ATT #1.
The state of the PREABS preabsorber is not known |
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Analyze and quantify the mispositioning of the new 4mm-aperture behind the undulator, posted by Jan Gruenert on 21 Jan 2023, 16:38
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Goal: Analyze and quantify the mispositioning of the new 4mm-aperture behind the undulator
Positions in tunnel:
ABSP4.2422.SA2 = ABSP4.CELL37.SA2 L_z position 2422.558m
Last closed undulator for this test is cell16 at 2294m (at end of |
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Issue, posted by Jan Gruenert on 22 Jan 2023, 18:40
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SASE1 blocked to 1 bunch/train by EPS interlock (sic, not 2 but 1) --- PARTIALLY RESOLVED
Several issues:
1) MODEM device is broken, in state UNKNOWN, see ATT#1 and ATT#2. Fixed with deinstatiating and then using BECKHOFF_ASSISTANT to re-instantiate. |
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Status, posted by Jan Gruenert on 23 Jan 2023, 10:43
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Status of machine SASE tuning (just before switching off for monday maintenance):
11.5 GeV operation
SASE1
SASE2
SASE3
Photon
energy
7 keV
7 keV
700 eV
Max. obtained average pulse energy
3.25 mJ
1.35 |
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SPB_XTD9_IMGPII45 lost steps - REPAIRED, posted by Jan Gruenert on 10 Apr 2023, 02:16
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REPAIRED / FIXED
Problem: The imager SPB_XTD9_IMGPII45 insertion motor lost steps and kept the machine to maximum 2 bunches per train.
Mitigation by DOC/EEE/PRC on 8 April 2023: made sure that screen seems actually out of beam and took imager out of interlock |
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Issue, posted by Jan Gruenert on 10 Apr 2023, 02:25
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REPAIRED / FIXED
Problem: The imager SPB_XTD9_IMGPII45 insertion motor lost steps and kept the machine to maximum 2 bunches per train.
Mitigation by DOC/EEE/PRC on 8 April 2023: made sure that screen seems actually out of beam and took imager out of interlock |
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Shift end, posted by Jan Gruenert on 13 Apr 2023, 15:57
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End of Diamond Sensor Study
We leave the SASE2 beamline in the following safe state:
Pre-Abs inserted
Solid ATT with T=0.001
All CRLs OUT
All imagers OUT
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Status, posted by Jan Gruenert on 03 May 2023, 13:01
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The machine tuning over the night had not yet accomplished fully satisfactory beam conditions mainly at the high photon energies for SA1 and SA2,
therefore tuning continued during WED morning.
Beam was handed over to SCS (SASE3) at 9h with about 2.4mJ at 2.5 keV. |
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SA1 status, posted by Jan Gruenert on 04 May 2023, 00:07
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SASE1 status:
First shift switchover this week at 23h from FXE (19.5 keV) to SPB/SFX (12.4 keV) with issues.
No immediate lasing at 12.4 keV with standard procedures / files, then tuneup using FEL imager (CBor) in multibunch. Wrong pointing (far off |
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SA2 status, posted by Jan Gruenert on 05 May 2023, 16:51
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MID reports an observation that is particular to the operation at the currently high photon energy of 23 keV
MID inserted the XTD6-MID-preabsorber and assumed that it completely stops the beam.
They acquired AGIPD detector images as dark frames but were surprised to still find some weak background signal (not dark). |
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Attention, posted by Jan Gruenert on 08 May 2023, 09:04
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Info from XRO (Maurizio Vannoni) to PRC concerning tunnel access request #152936 (Inspection and repair of SQS ESLIT)
- The ZZ-access will be done by Marc Planas, Massimiliano Di Felice, and Idoia Freijo.
- They will start their access between 9h00 and 9h30 and end their access by 12h30. |
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Issue, posted by Jan Gruenert on 08 Jun 2023, 10:37
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SASE2 vacuum incident
7h10 : MID informs PRC about a vacuum incident in the SASE2 tunnel which tripped the beam. Instructed to contact
directly VAC-OCD
8h26 : VAC-OCD informs that investigation is ongoing, but beam can be delivered. This kind of trip usually occured rarely |
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Issue, posted by Jan Gruenert on 08 Jun 2023, 17:05
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SA2_XTD1_ATT solid attenuator vacuum issue
Info from VAC (Raul Villanueva) 12h30:
It seems to be a leak in the arm nr. 6 (2.4mm CVD Diamond). This has escalated to trip several times the vacuum sector interlock.
On top of that, we also discover an issue with the configuration of a ion pump controller that have required the intervention of DOC / EEE. |
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Issue, posted by Jan Gruenert on 09 Jun 2023, 12:37
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Repair of SA2_XTD1_ATT
Status 12h30:
The current MID users took beam until 9am, only then the machine could start preparing for the tunnel access e.g. by decoupling the South branch, |
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Issue, posted by Jan Gruenert on 10 Jun 2023, 18:46
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18h05 : RC informs:
Machine is down, because Cryo-OK was lost.
Apparently it is a turbine but not the cold compressors. |
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Status, posted by Jan Gruenert on 10 Jun 2023, 21:52
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The Cryo team solved the problems, beam is back.
Downtime from 17h59 until 21h03. |