IPBPM test results at the LINAC end

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Presentation transcript:

IPBPM test results at the LINAC end KNU Siwon Jang

Contents New Low-Q IP-BPM design RF test of Low-Q IP-BPM Beam test of Low-Q IP-BPM Summary

New Low-Q IP-BPM design 11cm Low-Q IP-BPM drawings of HFSS Designed frequency X-port: 5.712 GHz Y-port: 6.426 GHz Full size : 11cmx11cm (to install IP-Chamber) Light weight: 1 kg (Single) 2 kg (Double) 100mm 100mm Sensor cavity Wave guide Antenna

Results of HFSS simulation 11cm AL ver. Port f0 (GHz) β Q0 Qext QL τ (ns) X-port 5.7127 5.684 4959.29 872.42 741.91 18.72 Y-port 6.4280 4670.43 821.61 698.70 17.23 Output signal for Y-port (11cm AL ver.) 2nm offset Parameter Value Unit q (charge) ~ 1.6 nC Beam energy 1.3 GeV Bunch length 8 mm

New Low-Q IP-BPM Made by Aluminum (1kg for 1cavity)

RF measurement data Port f0 (GHz) β Q0 Qext QL τ (ns) V_out [mV/um] Designed X-port 5.7127 5.684 4959.29 872.42 741.91 18.72 3.870 Y-port 6.4280 4670.43 821.61 698.70 17.23 3.724 Double_1 5.6968 0.656 362.34 552.14 218.77 6.112 4.870 6.4099 0.668 845.66 1266.7 507.11 12.59 3.005 Double_2 5.6975 0.817 483.38 591.45 265.99 7.430 4.705 6.4097 0.641 834.70 1302.5 508.70 12.63 2.964 Single_1 5.6991 0.855 502.05 587.04 270.61 7.557 4.722 Single_2 6.4089 0.986 1238.0 1255.9 623.43 15.48 3.019 Measured Q0 value shows too low for both x-port & y-port. Measured X-port data shows too strange, but output voltage shows little bit good. If possible I want to make one more set of Al IP-BPMs except volt type.

Low-Q IP-BPM Beam Test Double block IP-BPM performance Old high-Q Chamber Double block IP-BPM performance was tested at end of linac with old high-Q chamber. Beam

Test scheme @ end of Linac Distance between each elements In that test, we used just one BPM (BPM2). There is no more cables to connect BPM1. Beam test performed during 4hours. (Not enough to test other BPMs) 313cm 154cm 68cm BPM2 BPM1 ML2P Strip-line BPM ML3P IP-Chamber For linac test ZH1P Steering magnet ZV1P ZH2P ZV2P beam

Results of IP-BPM y-port sensitivity IP-BPM sensitivity (For y-port) = 0.87631[mV/um] (one-port measurements) = 2.27855[mV/um] (one-port measurements & Consider the 8.3dB cable loss) *if we used two y-port of BPM, we would have the results 4.5571[mV/um]. Designed sensitivity = 3.724[mV/um] for two-port Test conditions 4 steering magnet (2 ver. + 2 hor.) => ZH1P, ZH2P, ZV1P, ZV2P 2 strip-line bpm =>ML2P, ML3P ICT monitor: 0.87 *10^10 (at LNE)

Results of IP-BPM x-port sensitivity IP-BPM sensitivity (For x-port) = 0.34146[mV/um] (one-port measurements) = 0.88786[mV/um] (one-port measurements & Consider the 8.3dB cable loss) *if we used two y-port of BPM, we would have the results 1.77572[mV/um]. Designed sensitivity = 3.865[mV/um] for two-port Test conditions 4 steering magnet (2 ver. + 2 hor.) => ZH1P, ZH2P, ZV1P, ZV2P 2 strip-line bpm =>ML2P, ML3P ICT monitor: 0.87 *10^10 (at LNE)

Summary We tested new IP-BPM performance inside vacuum chamber at the end of Linac. The RF test results shows bad, but expected output voltage shows not bad. The beam test results shows quite good, Y-port results shows good performance. However, X-port results shows low performance less than expected value. When we discuss at France, the reason of low Q0 value seems caused by irregular surface of cavity. Therefore, the IP-BPM is polishing to check Q0 value again.