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Upgrading plan of the tagger

Upgrading plan of the tagger. Current “new” tagger (SciFi) top view. 1mm-square fiber 6 fibers = 1ch 1mm-step position measurement 1mm ~ 30 MeV s ~ 30/ √12 = 8.7 MeV  s ~ 13 MeV (assuming 10 MeV for E g ) Problem

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Upgrading plan of the tagger

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  1. Upgrading plan of the tagger Current “new” tagger (SciFi) top view • 1mm-square fiber • 6 fibers = 1ch • 1mm-step position measurement • 1mm ~ 30 MeV • s ~ 30/√12 = 8.7 MeV •  s ~ 13 MeV • (assuming 10 MeV for Eg) • Problem • Estimation of the photon energy resolution is still underway. • 13 MeV resolution is not good enough. (for Q+ study) •  Need upgrade… e’ ……… ……… PL SFB SFF

  2. Possible to get better resolution with current tagger ? • Using SFF-SFB combination • Case-1 SFF-CH# = SFB-CH# • Case-2 SFF-CH# = SFB-CH# -1 • overlapping size is different • (# of event: about 10:1) • It may be possible to get better position resolution but it will introduce different s components.  not good for practical analysis.  need upgrade with fine position detector • It may be used for cross-check of the resolution study. SFB SFF

  3. Possible to get better resolution with current tagger ? gp  ppp events for Eg<1.7 GeV from K0 experiment data (no SVTX)

  4. Upgrading plan of the tagger • To get better position resolution: • 0.5mm-SciFiber layer in addition to the current tagger. • Design (detector, Readout) is not finished. • Detector • structure (# of fibers along the beam…, # of plane), mechanical design…etc. • Readout • 110 ch for one plane. MA-PMT readout. • Space for one plane is available in the current radiation shielding box. • Discriminator, Logic, TDC… • ADC? • Current tagger: TDC only  ADC information will make detector tuning and efficiency estimation easier. But the readout cost will be higher…

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