X-ray delivery

• 9.3 keV, 1-85 pulses, 1 mJ, stable delivery

Optical laser delivery

• 800 nm, 1-300 pulses, stable delivery

Achievements/Observations

• Optimization of ns laser for illumiation and PP laser polarization
• Optimization of X-ray beam alignment and scattering background on AGIPD
• Timing at IRU and PAM
• GOTTHARD II timing scan and data collection
• Pump-probe data collection at IRU

Issues

• No major issues

X-ray delivery

• 9.3 keV, 1-85 pulses, 1 mJ, stable delivery

Optical laser delivery

• 800 nm, 1-226 pulses, stable delivery
• ns laser for illumination

Achievements/Observations

• Successfull arrival time slope tests
• GOTTHARD II data collection
• Pump-probe data collection at IRU with arrival time slope

Issues

• No major issues

Staff: JB, PV, TS, RL, RdW, JK, AR

X-ray delivery

• 1-165 pulses, 1.1 MHz, upto 400  uJ @ 50 pC

Optical laser delivery

• ns laser for imaging

Achievements/Observations

• NKB focus optimization
• Beam alignment until IBS
• Photodiode alignment
• Alignment of fixed target in the beam
• Tests with fixed target motion in vacuum
• Collected few runs with low transmission at 8 keV and 9 keV

X-ray delivery

• 1-165 pulses, 1.1 MHz - 28.2 kHz, upto 400  uJ @ 50 pC

Optical laser delivery

• ns laser for imaging

Achievements/Observations

• Optimized sample setup for data collection
• Calibrated photodiode @ 8keV.
  • ADC signal was saturated with amplified photodiode signal.
  • Removed the amplifier and calibrated photodiode again.
  • ASE signal is visible without the amplifier
• Optimized ASE signal by optimizing the focus and target position in focus
• Checking and optiming the focus everytime chaning the sample disk seems to improve the signal
• Collected data at 8 keV and 9 keV for about 1-2 hours

X-ray delivery

• 1-165 pulses, 1.1 MHz - 28.2 kHz, upto 350  uJ @ 50 pC

Optical laser delivery

• ns laser for imaging

Achievements/Observations

• Collected data for 3 to 4 hours with different samples
• Data collection at lower repetiton rate (113 kHz) with less number of pulses

X-ray delivery

• 1-165 pulses, 1.1 MHz - 56.4 kHz, upto 350  uJ @ 50 pC

Optical laser delivery

• ns laser for imaging

Achievements/Observations

• Collected data for 3 to 4 hours with different samples
• Data collection at lower repetiton rate (113 kHz) with less number of pulses
• Data to characterize the divergence of ASE collected

X-ray delivery

• 1-165 pulses, 1.1 MHz - 56.4 kHz, upto 350  uJ @ 50 pC

Optical laser delivery

• ns laser for imaging

Achievements/Observations

• Collected data for about 6 hours with different samples
• Data collection at lower repetiton rates with less number of pulses
• Data to characterize the divergence of ASE collected
• Photodiode calibrated at 8 keV again

X-ray delivery

• 9.3 keV, ~ 2 mJ, stable delivery except for the intensity slope along the train (fixed later on)

Optical laser delivery

• ns laser for imaging

Achievements/Observations

• Aligned the instrument for MKB focus configuration
• Optimzed MKB focus and detector background
• PCS - Collected data for about 3-4 hours with different sample concentration and crystal sizes.

Issues

• Issue with intensity slope along the pulse train (fixed later in the day)
• Issue with MKB combined motion (DOC informed)

X-ray delivery

• 9.3 keV, up to 181 pulses at 564 kHz, 1.8 - 1.9 mJ

Optical laser delivery

• PP Laser, 800nm, 50 fs, up to 181 pulses @ 564 kHz and 91 pulses at 282 kHz, stable delivery

Achievements/Observations

• Installed and aligned fixed target for pump-probe measurement
• Measured t0 with fixed target at IRU, scan tool to measure t0 was also tested
• Optimized Bimuth fixed target sample for diffraction condition
• Recorded pump-probe data (30 min 1 hour)
• Spatial and temporal overlap of X-ray and PP laser at PAM

Issues

• Issue with homing smaract stages used in fixed target. Solved by exchanging the stages for now but need to be checked later.
• Difficulties in observing pump-probe signal in online data analysis although diffraction signal could be seen and optmized on the fluorescent paper on DN500 and AGIPD detector
  • Data collected for further offline analysis

X-ray delivery

• 9.3 keV, up to 181 pulses at 564 kHz, 8 - 1.3 mJ
• Issue with pulse energy stability along the pulse train in the morning but optimzed later on in the day

Optical laser delivery

• PP Laser, 800nm, 50 fs, up to 181 pulses @ from 10 Hz to564 kHz

Achievements/Observations

• Optimized Bismuth diffraciton condition on AGIPD
• Collected pump-probe data with Bismuth fixed target
• Aligned PAM and measured arrival time with electron bunch arrival time slope enabled
  • Positive slope and V shape slope measured

Issues

• Issues with beam stability and intenisty.
  • Optimized later on in the day
  • But did not recover what we had yesterday in terms of pulse energy

X-ray delivery

• 7 keV, 2.1 mJ, stable delivery

Optical laser delivery

• None

Achievements/Observations

• M1, M2 pre alignment for this weeks beamtime
• Checked the beam trajectory through MKB mirrors after stripe change

Issues

• It seems that with wider funnel for the catcher, the YAG is not reaching the X-ray beam

Note: At 7 keV with 100 pulses, and full beam we were at 2.2 W average power.

X-ray delivery

• 13.6 keV, ~1.7 mJ and up to 352 pulses at 1.1 MHz

Optical laser delivery

• PP laser, 1 to 202 pulses, stable delivery except for the down time of ~1h

Achievements/Observations

• user sample data collected for ~1.5h
• PP laser timing scans done
• new adapter for the screens holder designed, machined and installed

Issues

• sample was growing on the adapter, preventing data collection
• new adapter is too far downstream, partially shadowing sample diffraction on the lower corners of the detector
• PP laser down for ~1h

X-ray delivery

• 1.3-1.7 mJ, 1-30 pulses, stable delivery

Optical laser delivery

• None

Achievements/Observations

• Aligned beam trajectory for 10.7 keV direct beam
• Optimized the microscopy table position and references
• Initial alignment and test of test of spectrometer crystal

X-ray delivery

• 1.3-1.7 mJ, 10.7 keV, 1-100 pulses, stable delivery

Optical laser delivery

• None

Achievements/Observations

• Installation of imaging optics and alignment

Issues

• No major issue today

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. 

On Monday Maik and I then entered the tunnel to fix the leak. The need of breaking the interlock to bring a dewar and a pumpcart was already discussed on Saturday/Sunday with the PRC (Jan Grünert) and BKR. So Maik and I could enter on Monday afternoon at around 13:20. We found out that the bellow of the arm number 4 is the leaky one which we removed then and put a blind flange. So the XTD 2 solid attenuator has two removed arms now (see photo).

After about half an hour of pumping both ion pumps on the Solid Attenuator were already in the good 10-6 mbar range. We also set back the setpoint of the three pumps P10160I, P10170I and P10180I to the default value 5x10-6 mbar and put the bridge for the end switch on the connector (see picture). The whole work including cleanup in the tunnel could be finished around 19:15 and the tunnel search crew could then set the interlock back.

So the acute problem with the leak could be solved for first now, but there was no time for the activation of the NEC pump. This should be kept in mind for the next shutdown, when we hopefully have spare parts and can anyway replace the arms number 4 and 5. 

We packed the removed actuator and diamond plate in foil and they are next to the radiation protection release box now and waiting for release (see photo). Email was sent to radiation protection officer.

Thanks to Maik for help and a nice working time yesterday and to Michaela for helping us to bring all the things to the XHE3 shaft building! Thanks also to Raul for talking to BKR as PRC and arranging the final tunnel access appointment!

- Tunnel + experimental hutch alignment (Mirrors, CRL1 and CRL2)

- Aligned main devices: Optics Peter, x-ray eye, EPIX and Zyla and pin holes.

- Tried some alignment of the NFL (1D) lenses with pin hole and not pre focussed beam. We found a lot of scattering from pinholes which dominates the signal on our x-ray eye. This task has to be redone with CRL2.

- We aligned magnetic beamstop

- We moved sample stage inside the beam (do not move optics peter!)

- We insert CRL 2 and took some data with EPIX and Vycor. We checked the beamprofile with x-ray eye it looks elongated.

Problems:

- Timescan is not working

- lot of scattering from pinholes when using large beam on NFL

After realignement of M1 and M2 we could solve the problem of the elogated beamprofile. Different lens setting were prealignd for the use in combination with the NFL.

We took data for several 1D diamond lenses together with a Vycor sample to extract the beamsize from the specles.

We tested pulse on demand scans with scantool and confirmed that there is only one shot per scan point. This was used to print the footprint in a LIf crystal.

We took caustic scans for 1D diamond lenses using a wire and using specles to extract the beamsize.

Shift summary:

- get the beam with 23keV and 120µJ 

- falignment of mirrors m1 and m2 on the pt stripe at 23keV

- irst time lens alignment with CRL1 and CRL2, get beam size of 5µm at sample position for users

- took data for the calibration of the AGIPD detector quadrants with LaB6 and Al targets

- set-up trigger of in-vacuum camera and ns-laser to match x-ray arrival time

- could not move the AGPID detector

Beamline status:

- Lenses insert, DN500 closed, AGIPD HV off, Feedback running with 5 pulses and increased attenuation (2mm Si in XTD6 ATT and 0.8 Si OPT ATT additional).

X-ray delivery:

- stable at 120µJ, mostly 63 pulses

- 1:30h downtime

- checked some alternativ lens configuration to test for smallest focus

- changed nozzle of liquid jet. The old one was strongly tilted at low flow rates

- overlap between x-ray / liquid jet achieved 

- first scans from pure water at different jet distances

Problems:

- still problems with AGIPD detector movements (Motor is a state that does not exist in Karabo, only a reset on PLC level seems to solve the problem for a short time)

- x-ray beam has hit part of the shielding resulting in some damaged pixels on the AGIPD.