Blochdocs (October 2024)

Note

The B-endstation closed-cycle cryostat is back in operation. A 6-axis manipulator is at the procurement phase, hopefully to be installed mid-to-late 2025

Wifi at the beamline

Connect to maxiv_user, using your DUO username and password.

Windows users: This will most likely not work for you unless you follow the instructions in this document to properly configure the network.

Allowed EPU settings

Mode

EPU Phase

Allowed gap range (mm)

Allowed hv range (eV)

Horizontal

0

No restrictions

>10

Vertical

42

>15

>14

Circular +

0 .. 42

>18*

>15

Circular -

0 .. -42

>18*

>15

*Conservative estimate. To be verified.

Maximum countrate (A-endstation)

Excessive countrates will damage the MCP in the detector assembly, and at BLOCH it is very easy to generate unsafe countrates. Respect the following rules:

  1. Maximum 1 million counts per second if everything is in a narrow stripe (for example transmission mode or graphene’s Dirac cone)

  2. Maximum 10 million counts per second if intensity is evenly distributed across the detector

  3. Core levels should be measured in an angular lens mode, except where lens table limits make this impossible.

Warning

There is no background process in SES to monitor countrates, so you must verify that the countrate is safe while in voltage calibration mode. If you will perform an angle scan or photon energy scan, check the intensity over the whole scan range, not just your starting position. If you will measure in swept mode, ensure that the intensity slightly below your starting point is also safe.

Maximum countrate (B-endstation)

The same considerations apply at the B-endstation, but Prodigy will automatically shut down the detector if you exceed the maximum countrate on the MCP (2 million counts per second)