Longitudinal phase space and temperature measurements were conducted on a $2--3ext{ }ext{ }ensuremath{mu}mathrm{s}$ long, singly charged ${mathrm{K}}^{+}$ ion bunch with an ion energy of $ensuremath{sim}0.3ext{ }ext{ }mathrm{MeV}$ and current of 30 mA. The principal objective of these experiments was to measure the longitudinal beam dynamics and study the limits of axial compression. The differences between the measured beam energy, longitudinal beam dynamics, and the amplitude and time history of the Marx voltage waveform were all quantified. Longitudinal phase space measurements indicate a slight chromaticity ($1%$) in the beam from head to tail. Record low longitudinal temperatures of ${T}_{z}=2--4ifmmodeimeselseexttimesi{}{10}^{ensuremath{-}2}ext{ }ext{ }mathrm{eV}$ were measured for a beam bunch of this intensity with negligible effects from neutralizing the beam space charge with a background plasma. A qualitative comparison of experimental and calculated results are presented, which include time resolved longitudinal distributions, and phase space of the beam at 430 cm.
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机译：纵向相空间和温度测量是在$ 2--3 text {} text {} ensuremath { mu} mathrm {s} $长，单独充电的$ { mathrm {K}} ^ {+}上进行的离子束，离子能量为$ ensuremath { sim} 0.3 text {} text {} mathrm {MeV} $，电流为30 mA。这些实验的主要目的是测量纵向梁的动力学并研究轴向压缩的极限。量化了测得的束能量，纵向束动力学以及马克思电压波形的幅度和时间历程之间的差异。纵向相空间测量结果表明，从头到尾的光束中存在轻微的色度（$ <1％$）。记录低纵向温度$ {T} _ {z} = 2--4 ifmmode times else texttimes fi {} {10} ^ { ensuremath {-} 2} text {} text {}测量了该强度的一束光束的 mathrm {eV} $，而其与背景等离子体中和光束空间电荷所产生的影响可忽略不计。给出了实验结果和计算结果的定性比较，其中包括时间分辨的纵向分布以及430 cm处光束的相空间。
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