Electromagnetic radiation detection system comprising: - an enclosure provided with a wall with a bottom, a top and at least one side wall connecting the bottom and the top, the enclosure being closed and tightly sealed, - a detection circuit configured to detect an electromagnetic radiation and to supply an electrical signal representative of the detected electromagnetic radiation, - a cooler fixed to the enclosure and configured to cool the detection circuit , the cooler being of Joule-Thomson or Stirling type, - a cold table supporting the detection circuit , - a cold shield fixed to the cold table , - a support configured to fit the cold table fixedly with respect to the enclosure , the support defining a first mechanical connection between the cold table and the wall of the enclosure , the support being fixed to the enclosure independently from the cooler , - a thermal connector having a first end fixed to the cooler and a second end fixed to the cold table or to the cold shield so that the cooler cools the detection circuit , wherein the detection circuit , the cold table , the cold shield and support are arranged in the enclosure , electromagnetic radiation detection system characterised in that : - the thermal connector is a deformable thermal connector that defines a flexible mechanical connection between the cooler and the cold table or to the cold shield , - the support is a thermally insulating support that thermally insulates the cold table with respect to the wall of the enclosure . - an enclosure provided with a wall with a bottom, a top and at least one side wall connecting the bottom and the top, the enclosure being closed and tightly sealed, - a detection circuit configured to detect an electromagnetic radiation and to supply an electrical signal representative of the detected electromagnetic radiation, - a cooler fixed to the enclosure and configured to cool the detection circuit , the cooler being of Joule-Thomson or Stirling type, - a cold table supporting the detection circuit , - a cold shield fixed to the cold table , - a support configured to fit the cold table fixedly with respect to the enclosure , the support defining a first mechanical connection between the cold table and the wall of the enclosure , the support being fixed to the enclosure independently from the cooler , - a thermal connector having a first end fixed to the cooler and a second end fixed to the cold table or to the cold shield so that the cooler cools the detection circuit , wherein the detection circuit , the cold table , the cold shield and support are arranged in the enclosure , electromagnetic radiation detection system characterised in that : - the thermal connector is a deformable thermal connector that defines a flexible mechanical connection between the cooler and the cold table or to the cold shield , - the support is a thermally insulating support that thermally insulates the cold table with respect to the wall of the enclosure . - the thermal connector is a deformable thermal connector that defines a flexible mechanical connection between the cooler and the cold table or to the cold shield , - the support is a thermally insulating support that thermally insulates the cold table with respect to the wall of the enclosure . <EOS>