The SPIRAL1 charge breeder is now under operation. Radioactive beam has already been delivered[1] to physicists for performing experiments. Although charge breeding efficiencies demonstrated high performances for stable ion beams, efficiencies regarding radioactive ion beams were found to be lower than expected in the first experiment. The beam optics, prior to the injection of the 1+ ions into the SPIRAL1 charge breeder, is of prime importance[2] for reaching such high efficiencies. Moreover, the intensities of the radioactive ion beams are so low that it is very difficult to tune the charge breeder. The tuning of the charge breeder for radioactive ion beams requires a particular procedure often referred to as “blind tuning”. A stable beam with a similar Brho (within a few percent) is required to find the set of optic parameters before tuning the radioactive ion beam. Hence, it has been decided to focus our efforts on this procedure in order to get control of the 1+ beam optics leading to high charge breeding efficiencies whatever the 1+ mass, energy and Target Ion Source System (TISS) used. Knowing that each TISS provides ion beams with a specific energy spread ΔE, and given that the energy acceptance window of the charge breeder is rather narrow, this parameter must also play an important role in determining the overall charge breeding efficiency. This contribution will show the strategy undertaken to overcome the difficulties encountered in the charge breeding tuning with 1+ radioactive ion beams from the different ion sources, and the results already obtained. A series of experiments have been done to record beam parameters as well as beam profiles in two modes: “shooting through” and 1+/N+. Simulations have been developed to replicate the measurements: for this purpose a combination of SIMION and TraceWin software was used. The final goal is to define a set of beam optics reliable enough for operation covering a large range of 1+ mass, energy and emittance; applying the resulting set of parameters must eventually allow to approach the expected optimal charge breeder performances while producing a radioactive ion beam.

SPIRAL1 电荷增殖器现在正在运行。放射性束已经 [1] 交付给物理学家进行实验。尽管电荷增殖效率证明了稳定离子束的高性能，但发现放射性离子束的效率低于第一个实验中的预期。在将 1+ 离子注入 SPIRAL1 电荷增殖器之前，光束光学器件对于达到如此高的效率至关重要 [2]。此外，放射性离子束的强度很低，很难调整电荷增殖器。对放射性离子束的电荷增殖器进行调谐需要一个通常称为“盲调谐”的特殊程序。在调谐放射性离子束之前，需要一个具有类似 Brho（在几个百分点内）的稳定光束来找到一组光学参数。因此，我们决定将我们的精力集中在这个程序上，以便控制 1+ 光束光学器件，从而实现高电荷繁殖效率，无论使用什么 1+ 质量、能量和目标离子源系统 (TISS)。知道每个 TISS 提供具有特定能量扩散 ΔE 的离子束，并且考虑到电荷增殖器的能量接受窗口相当窄，这个参数也必须在确定整体电荷增殖效率方面发挥重要作用。这一贡献将展示为克服使用来自不同离子源的 1+ 放射性离子束进行电荷增殖调谐时遇到的困难而采取的策略，以及已经获得的结果。已经进行了一系列实验，以两种模式记录光束参数和光束轮廓：“穿透”和 1+/N+。已经开发了模拟来复制测量：为此使用了 SIMION 和 TraceWin 软件的组合。最终目标是定义一套足够可靠的光束光学器件，以覆盖 1+ 质量、能量和发射率的大范围操作；应用得到的一组参数最终必须允许在产生放射性离子束的同时接近预期的最佳电荷增殖器性能。最终目标是定义一套足够可靠的光束光学器件，以覆盖 1+ 质量、能量和发射率的大范围操作；应用得到的一组参数最终必须允许在产生放射性离子束的同时接近预期的最佳电荷增殖器性能。最终目标是定义一套足够可靠的光束光学器件，以覆盖 1+ 质量、能量和发射率的大范围操作；应用得到的一组参数最终必须允许在产生放射性离子束的同时接近预期的最佳电荷增殖器性能。