Strip line beam position monitor for HLS LINAC

1 Introduction Beam position monitors at HLS LINAC and transfer line will deliver the information about the transverse positions and phases of beam passing by. Typical requirement for position resolution is within 1mm within 1/3 of half aperture rb (rb of HLS LINAC is 25mm). The HLS LINAC BPMs will also serve as beam phase detectors, which require a tough broad-band frequency response and impedance match for the BPMs. Additionally, space available for the BPMs at the HLS LINAC…

Strip line beam position monitor for HLS LINAC

The parameters of beam transverse positions at HLS 200 MeV LINAC are very important to injection efficiency. We have designed a new non-interceptive strip line beam position monitor (BPM) as a substitution for the original interceptive fluorescent target. This paper gives out the theoretical analysis and bench test result of the strip line BPM. The BPM has a characteristic impedance of (50±5)Ω, a reflection coefficient of less than -4 dB, a bandwidth of 400 MHz, a coupling coefficient of less than -15 dB, and a sensitivity of 1.16 dB/mm. Additionally, the strip line BPM has a good linearity.