Electromagnet before 2019-09-10
===============================

This page lists the parameters of the first version of the FFT electromagnet
that was installed in the FFT end-station from the start of SCS operation up
to the 10th of September 2019 when an improved version was put in place instead.

.. _electromagnet_field:
.. figure:: electromagnet-field.png

  Magnetic field as function of current in the electromagnet.
  From `elog 270`_.

  ======= ======= =====
  Voltage Current Field
  V       A       mT
  ======= ======= =====
  0       0       4
  1       1.3     50
  2       2.6     98
  3       4       150
  4       5.3     200
  5       6.5     250
  6       7.7     283
  7       9       315
  8       10      335
  9       11.1    355
  10      12.2    362
  ======= ======= =====

.. _electromagnet_temperature:
.. figure:: electromagnet-temperature.png

  Temperature of the electromagnet for different settings.
  From `elog 270`_.

The magnetic field generated by the electromagnet is shown in
:numref:`electromagnet_field`.

=====================  ===================  =================
gap between pole (mm)  maximum current (A)  maximum field (T)
=====================  ===================  =================
7.7                    12                   0.37
=====================  ===================  =================

The temperature reached near the coil winding edge on the pole is shown in
:numref:`electromagnet_temperature`. Combination of 5°C cooling and high water
flow-rate should keep the coil temperature <50°C when operating at 12 A in
vacuum.

The geometry of the pole shoe is defined in `CAD file`_.

.. _elog 270: https://in.xfel.eu/elog/SCS+Beamline/270
.. _CAD file: https://docs.xfel.eu/share/page/site/xfelwp86/document-details?nodeRef=workspace://SpacesStore/10c07bd4-0dce-419f-b3c6-db51d614a2a1