Late Shift Summary, posted by Benjamin, Yi-Ping, Ru-Pan, Andreas on 31 Mar 2023, 05:10
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Achievements
Optimized BOZ for Co and Fe
Estabilished Stable liquid jet flow with 30 mM Fe(bpy)3
Problems
Jet froze several times
Chamber warmed up earlier in the day. This led to a "dusting" of CNCbl on many surfaces |
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Late Shift Summary, posted by Benjamin van Kuiken on 02 Apr 2023, 04:46
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Achievement
Measured tXAS at the Fe L-edge of Fe(bpy)3 using both delay and energy scans.
Issues
The cold traps ran empty on the chamber resulting in a pressure spike that interlocked the DSSC
The rough vacuum of the chem |
KW44 - Leak in Solid Attenuator, posted by Janni Eidam on 07 Nov 2023, 15:57 
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There was a leak in the Solid Attenuator that increased on Saturday morning when SPB moved the arm number 4 (see last entry ID 236).
We were lucky that a balance developed between the leak and the pumping of the ion pumps, so by setting the setpoints of the three most affected
ionpumps to 5x10-5 mbar we could survive the weekend and save the beamtime. |
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Jet alignment test- obeserver, posted by Jaydeep Patel on 29 Oct 2022, 11:03
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Nozzle type
Nozzle Aperture(µm)
Sample |
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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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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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Issue, posted by Chan Kim on 02 Feb 2023, 06:37
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SPB_IRU_DPA/MOTOR issue
X stage looks okay, but Y, AX, and AY values have been changed by 2-3mm. (see attachment 1 and 2)
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Issue, posted by Harald Sinn on 05 Feb 2023, 15:18
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15:15 SCS called and reported an issue with one of the motors of the SCS exit slit. DOC already looked at the problem and could not make the motor
move. XRO (Maurizio) is now informed and looks at the problem
17:10 ZZ access to XTD by Maurzio and Mikako |
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Issue, posted by Frederik Wolff-Fabris on 13 Feb 2023, 19:02
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SA3 SCS exit slit: the upper blade was detached from the motor and fall into closed position. Maurizio V. and F. Wolff-Fabris tried to move it out
of the beam by placing spacers to hold the blade up.
Bottom blade was moved down with the motors. Currently both motors are disconnected. |
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Issue, posted by Romain Letrun on 28 Feb 2023, 07:17
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| In the public status display, it looks like FXE is taking the beam even though their shutter is closed. |
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Issue, posted by Harald Sinn on 14 Mar 2023, 10:56
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The longitudinal feedback on SA1/3 was swicthed off by mistake over night. When it will be switched on, the beam may wiggle a bit an SA1+SA3 for
short.
We agreed with SCS and FXE that this will be done today at 11:30 |
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Issue, posted by Harald Sinn on 14 Mar 2023, 14:40
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In order to optimise the performance of SASE2 self seeding, a stronger compression setting is required.
The RC proposed to increase the time window between SASE2 and SASE1/3 to avoid performance degradation and cross talk effects on SASE1/3.
I discussed with SCS and FXE instruments and there seems to be nothing against moving the time trigger by 30 micro seconds later, as proposed |
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Issue, posted by Harald Sinn on 14 Mar 2023, 20:26
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SCS could only use two pulses, because the SXP imager was still in the beam and SXP shutter open.
I removed the SXP imager, so SCS can now get the full beam. The SXP shutter is still open and SXP instrument contacted via email to find out,
if the shutter is intentionally open. |
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Issue, posted by Romain Letrun on 23 Mar 2023, 11:38
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When using 1.13 MHz X-ray repetition rate, SASE1 HIREX is capturing two pulses in a single frame giving the impression that there are more peaks within
the spectrum than there are in reality.
This was verified by recording data with one and two pulses per train, which are shown in attachment. |
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Issue, posted by Angel Rodriguez Fernandez on 28 Mar 2023, 15:26
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The door from MID side entrance was smashed and we lost the radiation permit.
The acciedent happened between 11 (when the door was lest use by MID members) and 14:19 (when the picture was taken).
It is possible that we will have the permit in the next hours to countinue. |
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Issue, posted by Frederik Wolff-Fabris on 04 Apr 2023, 08:37
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TUE 08:30AM:
The SA3 Cell 17 & 18 Phase shifters do not move and encoders are damaged. A ZZ is needed to exchange the encoders. Instruments are informed
and access will take place Tuesday morning. Machine has separated the north branch. |
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Issue, posted by Yifeng Jiang on 07 Apr 2023, 23:57
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After receiving beam from SPB, we noticed that there is a werid shape of beam in the FEL imager which was not observed yesterday.
Maybe someone left X-ray component in the beam. |
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Issue, posted by Andreas Galler on 08 Apr 2023, 10:29
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Changed EPS Interlock condition for SPB_XTD9_IMGPI/SWITCH/SCREEN_OUT
SPB/SFX called DOC this morning for being limitied to two pulses by the EPS (Instrument should have called PRC instead)
After tracing the issue to the SPB_XTD9_IMGPI/SWITCH/SCREEN_OUT switch SPB/SFX decided to take this imager out of the interlock, confirming |
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Issue, posted by Yifeng Jiang on 08 Apr 2023, 23:44
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| We notice that 0.5 mm Silicon ATT in SASE1 causes holo beam profile in FEL imager. Maybe this silicon att has been damaged. |