1973. During the installation of the SL75/20 linear accelerator in the NKI. From left to right: Rein Helmink (engineer NKI); Stan Taylor (Philips-MEL), Charles Ashman (project leader Philips-MEL), Henk van der Gugten (engineer NKI).
The Netherlands Cancer Institute (NKI) orders Philips' new model of linear electron accelerator (linac) of the type SL75/20, which is still under development. This will be the first linac having a choice between two powerful photon energies of 8 and 16 MV (megavolt), in addition to eight electron beams with energies of 4, 6, 8, 10, 12, 14, 17 and 20 MeV (mega-electron-volt).
The Philips-MEL division (from Crawley, Great Britain) installs one of the two prototypes of the SL75/20 in the NKI. The head of the development group of Philips-MEL, Charles Ashman, supervises the installation in Amsterdam.
On completion of the SL75/20 accelerator, Philips is permitted to make a film commercial in the treatment room of the NKI-AVL. In order to create an authentic atmosphere the cast consists of co-workers of the hospital. A summary of this film can be seen in another item on the timeline, in 1975: Summary of the film commercial of Philips about the SL75/20.
The cooperation between Charles Ashman and the physics-technical group of the NKI results in a long lasting working relationship. Philips-MEL provides knowledge and parts that allow the NKI to perform fundamental adaptations and revisions of Philips accelerators.
Modulator and control cabinet of the SL75/super accelerator after the modernization.
In 1976, the SL75/super accelerator is modernised by the NKI group. The stability and the reliability of the radiation beams and the dose measuring system are improved. In addition to the 8 MV photon beam, electron beams of 6, 8, 10, and 12 MeV become available.
Left: the original control panel of the SL75/super. Right: the control panel as modernized by the NKI group. The construction, the functionality and the controls have been made identical to the newly installed SL75/20 accelerator.