在HIRFL-CSRm上进行高能量密度物理和等离子体物理的研究需要一个能提供高电压的高频腔来对束团进行纵向压缩,而磁合金加载腔获得较高的加速场梯度可以满足这一要求,且腔体不需要调谐,从而简化了高频控制系统。为了选择磁导率和阻抗较大、Q值（品质因数）小于1的磁合金材料来加载压缩高频腔,对型号为V和A的两种磁合金材料进行了测试。测试结果表明：型号为V的材料具有较大的磁导率、阻抗和小于1的Q值,将被用来加载腔体以获得足够高的加速电场梯度。
A high-voltage RF cavity is required to compress the beam bunch in the longitudinal for high energy density physics and plasma physics research at HIRFL-CSRm.A magnetic alloy（MA）-loaded cavity which has high acceleration gradient and without tuning loop（can simplify the RF control system）,can meet the requirement.In order to select a proper MA material with higher permeability and shunt impe-dance,Q1 value to load the RF compression cavity,two different MA materials V and A have been tes-ted.The results indicate that the material V will be better for the construction of the RF cavity than material A because of its higher permeability and shunt impedance,Q1 value.
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