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From November we organized visits with explanation concerning Andromede installed in the Super ACO lobby. We began these visits with the staff of the Accelerator Division in November 26th (the birth day of the scientist in charge of Andromede). All staffs of IPNO services and divisions were invited and we were pleased to have a strong participation and we hope that the comments expressed fervently have been well received.


The accelerator was delivered to Orsay in June, after being commissioned successfully in March 2015 at NEC (National Electrostatics Corporation) to Middleton (Wisconsin, USA). It was installed temporarily in the SuperACO hall pending completion of IGLEX Centre commissioned in December 2016. The acceptance tests in July showed that the first accelerator tube was damaged during transport. He was replaced in August and all the equipment was assembled and tested in September 2015, incorporating the magnet high energy deviation and High energy beam lines.


The first phase of the Andromede project (ANR-10-EQPX-23) enters its final step. The commissioning of the Van de Graaff type accelerator built by NEC (National Electrostatics Corporation, Middleton, Wisconsin USA) took place from March 15 through March 28, 2015. Figures 1 & 2 show the accelerator opened and closed. A maximum voltage of 4160 MV was reached with a long stabilization at 4100 MV (Figure 3). The terminal voltage of 4 MV was left unattended without any problem during 15 hours with a SF6 pressure of 6.5 bars. The accelerator is equipped with two interchangeable ion sources : the ECR source Microgan™ provided by Pantechnik (Bayeux, France) and the ionic column NAPIS (NAno-Particle Ion Source) which produces gold nanoparticle beams provided by OrsayPhysics (Fuveau, France), partner of the Andromede project. Figure 4 shows the accelerator terminal with all electronic boxes corresponding to the power supplies, for the injection beam line in the accelerator and the ion sources. The NAPISource is in operational position. The accelerator beam extraction tests were carried out with the ECR Microgan™ source. We obtained 20 µA intensities of SF5+, CO+, and H2+ beams. The tests showed that small modifications were needed to make in order to change the ion source configuration more easily. Once these modifications are implemented, the accelerator will be shipped and arrive in Orsay sometime in May. It will be installed temporarily in the SuperACO building, during the completion of the IGLEX one scheduled for mid-2016.

Figure 1. Terminal and high voltage structure which are under sulphur hexafluoride pressure

Figure 2. 4MV NEC accelerator

Figure 3. 4.100 MV applied on the terminal of the Andromede accelerator.

Figure 4. 4MV NEC terminal Accelerator with the ECR and NAPIS electronic boxes.



Institut de Physique Nucléaire Orsay - 15 rue Georges CLEMENCEAU - 91406 ORSAY (FRANCE)
UMR 8608 - CNRS/IN2P3

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