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. 

If the arm 6 is kept closed (2.4 mm CVD  is inserted), the leak rate seems to be small enough to allow operation (average sector pressure in the low 10-7 mbar). Otherwise it will blow consistently the interlock. (I repeat here: DO NOT MOVE THE 2.4 MM CVD!!!) See attachment #1. Most probably the leak would be in the custom-made bellow of that particular actuator. XRO just confirmed that there is no spares available.

Info by MID (12h30):
For today, MID can operate with the 2.4mm diamond inserted without impact to their experiment. However, tomorrow morning there will be a new user and experimental setup, which will require full transmission throughout the weekend, therefore the 2.4mm diamond attenuator must be removed friday. The change in experimental setup means that MID will work in the hutch at 10am for several hours and won't take beam anyhow.

Discussion of PRC+RC+XO+VAC+MID (15h30), with agreement to the following actions:

a) VAC prepares an intervention to XTD1 with broken interlock tomorrow morning startin 9am to remove arm 6 permanently and putting a blind flange instead. This intervention is estimated to start 9am and last for 4 to 5 hours. VAC will inform BKR if the work can be completed quicker.

b) Next week (last operation week in this run) therefore the Solid attenuator arm 6 won't be available. HED confirmed to PRC that it will be acceptable for their experiment since they plan to use full transmission in XTD2 and use their own attenuators in the HED hutch to attenuate the beam. XPD confirms that the XTD2 attenuators are not required for HIREX operation since HIREX contains its own attenuators between the bent crystal and the detector.

c) BKR/RC will organize the required tunnel search for the friday afternoon, and subsequently the HXRSS team will start optimization.

d) X-Ray Optics has already initiated the contact with the ATT device supplier to get replacement parts that will allow to recover full functionality during the upcoming (short) summer maintenance week.