4.11. from 08:00 until 5.11. 08:00 - Jan Gruenert by email (work mobile defect)

5.11. from 08:00 until 6.11. 08:00 - Naresh Kujala 9-6840 

Plan of WP74 OCD contacts for May.
Assignments are subject to change.

Initially availability is 10h-18h on the given days.
This might be adapted as well for later weeks.

02.09. from 08:00 until 03.09. 08:00 - Wolfgang Freund 9-5630  

03.09. from 08:00 until 04.09. 08:00 - Florian Dietrich 9-6968

30.09. from 08:00 until 01.10. 08:00 - Andreas Koch 9-6443

01.10. from 08:00 until 02.10. 08:00 - Joakim Laksman 9-5630  

WP74   OCD  for the  weekend 6.5.-7.5.2017:

Saturday: Jan, jan.gruenert@xfel.eu, 9-5777

Sunday: Theo, theophilos.maltezopoulos@xfel.eu, 9-6792

WP74   OCD  for the coming weekend 29.4.-1.5.2017:

Saturday: Theo, theophilos.maltezopoulos@xfel.eu, 9-6792

Sunday: Jan, jan.gruenert@xfel.eu, 9-5777

Monday: Theo, theophilos.maltezopoulos@xfel.eu, 9-6792

Note: Theo has Torbens work phone this weekend since Theo has not yet his own mobile work phone

Dear all,

The update of the Vacuum loop will take place in the next few minutes, later on, you would have access again to it.

Thank you.

During the usual recovery procedure after the planned and announced cycling of the SASE1 VAC loop yesterday, we observed a serious mistake by somebody:

The gatevalve(s) of the DP section in XTD9 were opened before the related turbo pumps were (fully) operating.
This caused a pressure increase on the UHV-side to briefly 1E-2mbar (!) and for about 30min to 1E-3mbar before this was cured.
Essentially the prevacuum side gases entered the UHV-side through the DP-turbos, that's not good at all.
Especially it would be tragic, if we had the XGM high voltages on during such a mistake (which was luckily not the case)
Below is the pressure record of the XGM UHV vacuum gauge.

This must not happen again ! Therefore please observe the following points:
1) after PLC reboots, these valves shall only be opened by the experts who know the correct sequence
2) the pressures and TP operation must be verified before opening these valves.
3) WP74 (e.g. Jan or Theo) and VAC (e.g. Raul) must be informed about a planned recycling of the VAC loop (this is an established scheme and always worked very well, also yesterday)

Explanations to graph:
13h30 the preparation of the cycling started with closing the XGM vatterfly valves by WP74
14h00 apparently the gate valves of the entire gas section closed at the PLC reboot which increases slightly the pressure at the XGM
around 14h18 the pressure shoots up although nothing changed at the XGM, and it is found that DP gatevalves are open without full operation of the associated turbos
around 14h50 (after some cross-checking and phone calls) the concerned gate valves were closed and the vatterfly valves at the XGM were opened to bring the XGM (and the entire gas section) down to about 1E-7mbar

Not really official, but in emergency case you can call 96993 for vacuum group. Next week Martin is back and I think we will have official on call service.

Have a nice weekend with hopefully no problems :-)

Tomorrow, 14th of March, Vacuum and Motion loop will be down at least during morning due to technical reasons .

I will notify you when the works are finished.

Dear all,

Finally today the Vacuum and Motion will still running the hole day and I would have to stop them tomorrow morning. Before doing this operation, I will post an entry in the ELOG.

Today Denis has to make some changes in the Vacuum and Motion hardware loop, therefore they would be down some time.

At least, we would try to keep the Vacuum loop up again for 3pm, therefore Valerii and Raul could use it with Karaboo.

Vacumm and Motion are running again after the hardware changes.

Dear all,

The Vacuum PLC is up and running and Karaboo guys have already started to work with it.

Thank you and regards

Dear all,

One power supply needs to be changed in SASE1 XTD9 rack 1.12 tomorrow and it's related to the Vacuum loop. Denis Finze will do this change tomorrow morning, but we have to make sure before that we have all the equipments after this rack 1.12 in safe state (most concerning part, XGM in XTD9). Please, could you make sure that everything it's ok tomorrow at 10am? However I will send an email now to the involved people.

Thank you and best regards,

Dear all,

Tomorrow at first hour, some hardware modules would added in Rack 1.1 and 1.9 in XTD2 in the Vacuum loop. Therefore the communication would be interrupted till the firmware is downloaded to the PLC, around 10h-10.30h should be running again to add the XGM XTD2 into the loop. Although, I will post a new entry to let you know.

Thank you,

Dear all,

The XGM XTD2 is already into the Vacuum loop and the loop is running. We would continue with the interlock tests today in the afternoon, but would not affect to other parts of the Vacuum loop.

Also was requested to change the Karaboo names of the devices in XGM XTD2, therefore a firmware updated would be necessary and would be performed today in the afternoon after VAC-MPS communication tests.

Thank you!

Dear all,

I will update the Vacuum loop in order to add the XGM XTD9 into it. It will be running in few minutes again.

Thank you.