In 1933, on the advice of Hertz, he became a member of the Nationalsozialistischer Kraftfahrer Korps (NSKK, National Socialist Motorist Corps).
At Kiel, Walcher developed a mass spectrograph for both isotope separation and determination of the degree of enrichment of uranium samples.
From 1940, he worked on the German nuclear energy project, also known as the Uranverein (Uranium Club), under which he worked on two mass spectrometers to determine the composition of isotope mixtures and for neutron-spin analysis [1] In 1942, Walcher’s Habilitationsschrift was rejected on the basis of “political unreliability.” However, Hans Kopfermann, a principal in the Uranverein, had become the Director of the Second Experimental Physics Institute at the Georg-August University of Göttingen in 1942 and he successfully intervened on Walcher’s behalf so that the Habilitation from the University of Kiel was conferred.
[4][5] Walcher was a co-initiator of the Gesellschaft für Schwerionenforschung (GSI, Society for Heavy Ion Research) in Darmstadt and the Deutsches Elektronen-Synchrotron (DESY, German Electron Synchrotron) in Hamburg.
The reports were confiscated under the Allied Operation Alsos and sent to the United States Atomic Energy Commission for evaluation.