Slit-based emittance measurement system for high-brightness injector at Hefei Light Source
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摘要: 为了测量受空间电荷效应支配的发射度，合肥光源高亮度注入器采用了狭缝法进行测量，研究了基于狭缝法发射度测量系统的构成，并以实例比较了单狭缝和多狭缝在发射度测量系统中的应用。两种测量方法的结果表明：单狭缝法测量的结果更接近于模拟计算值，可有效避免子束团之间的重叠，适用范围更广。实验结果表明：在240 pC电荷量情况下，合肥光源高亮度注入器仍然具有较小的归一化发射度，为（1.840.085） mmmrad。Abstract: In order to measure the beam emittance which is space charge dominated, a slit-based emittance measurement system is applied in Hefei Light Source(HLS). Two types of slit masks are chosen: multi-slit one and single-slit one. Measurement results show that, single-slit based emittance measurement yields closer results to the simulation value. Moreover, single-slit based emittance measurement can avoid the overlapping between adjacent beamlets, which makes its application range wider than multi-slit technique. The experiment result shows that with the beam charge of 240 pC, normalized emittance of (1.840.085) mmmrad can be achieved at HLS.
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Key words:
- high brightness injector /
- emittance /
- phase space /
- beamlet /
- slit
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