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16.1 About ILCTA

Fermilab is currently building an ILC test accelerator, called NML. The facility will be capable of testing superconducting accelerating modules with an ILC-like beam. It is anticipated, as the need for ILC-related tests diminishes, that the facility will start providing beam to support Advanced accelerator R&D projects and experiments. An overview of the ILC test accelerator is shown in Figure 16.1. The accelerator complex incorporates an L-band radiofrequency (rf) gun operating at 1.3 Ghz. The bunches are emitted from a CsTe photocathode with a nominal charge of 3.2 nC. The photocathode drive-laser enables the generation of a series of bunches repeated at 3 MHz within a macropulse of nominal duration of 1 ms. The beam energy upon exit from the rf-gun is about 4 MeV. The energy is then boosted to 40-50 MeV by two TESLA-type cavities located downstream of the rf- gun. Eventually a 3rd harmonic cavity will be installed, its main purpose being the linearization of the longitudinal phase. The nominal beam parameters out of the injector are shown in Table 16.1.

Figure 16.1 was taken from the presentation of S. Nagaitsev[34]

**Figure 16.1:** NML facility

Emmanuel Branlard
http://emmanuel.branlard.free.fr/