NKS2 Meeting- Tagging Efficiency of October data -

Kyo Tsukada

Events (1)

• 10/9 9:00 start• 10/9 15:00 preparation for experiment

– Radfile : 5mA40sec1009.sig, center = 54.7, (15:00~ )

• 10/10 18:00 We found that the tagging efficiency was too low.– Run1702 - 1707

– Radfile : 5mA40sec1010.sig, center = 54.8, (18:00~ )

• 10/11 0:35 We moved the start timing of the spill gate from 3rd step to 4th step ( delay of about 0.1 sec ).– Radfile : 5mA40sec1010-2.sig, center = 54.8, ( 0:35~ )

• 10/11 8:00 We confirmed the low efficiency again.– Run1720

– Picture of the output of RateMeter @16:00

– Radfile : 5mA40sec1011.sig, center = 54.7, ( ?18:00~ )

Events (2)

• 10/12 8:00 Tagging efficiency– Radfile : 5mA40sec1012.sig, center = 54.1, ( 6:15~ )

– Run1737

• 10/12 9:00 Beam tuning– Radfile : 5mA40sec1012-2.sig, center = 54.83, ( ?12:30~ )

• 10/12 14:00 Tagging efficiency– Run1740

– Radfile : 5mA40sec1012-3.sig, center = 54.7, ( 18:00~ )

• 10/12 22:00 We checked the tagger hit pattern for BM4 ON/OFF and BM5 ON/OFF.– Run1747 – 1750

– Radfile : 5mA40sec1013.sig, center = 54.6, ( 10/13 4:00~ )

– Radfile : 5mA40sec1013-2.sig, center = 54.7, ( 10/13 9:30~ )

Events (3)

• 10/13 18:00 Tagging efficiency– Run1770

• 10/14 18:00 Tagging efficiency– Run1789 ( ~5kHz )

– Run1791 ( ~1.5kHz )

– Run1793 ( ~15kHz )

– Run1795 ( ~30kHz )

• 10/15 0:00 Tagging efficiency ( radiator did not move )– Run1797 ( 5mA40secPos358.sig )

– Run1799 ( 5mA40secPos310.sig )

– Run1802 ( 5mA40secPos334.sig )

• 10/15 2:00 taking pictures• 10/15 5:00 Tagging Efficiency ( relatively high intensity )

– Run1803 - 1804

Radiator file

• Flat top : 40.5 [sec]• Beam width : 0.9 [mm]• Beam center : 54.7 [mm]• #parameter : 400• Etc.

Tagging Efficiency

• Definition:– ADC Gate : Led Line

– Eff = #Right / #All

TagF1

TagF48

Example of ADC spectra of LG

Run1720

• Intensity ~ 8kHz• Radfile : 5mA40sec1010

-2.sig, center = 54.8• #Event/Spill ~ 60000• Efficiencies for every 1000

0 events.

• Efficiencies became worse as the radiator moved near the beam or as the time passed.

Run1737

• Intensity ~ 3kHz• Radfile : 5mA40sec1012.s

ig, center = 54.1• #Event/Spill ~ 50000• Efficiencies for every 1000

0 events.

Run1740

• Intensity ~ 5kHz• Radfile : 5mA40sec101

2.sig, center = 54.1• #Event/Spill ~ 60000• Efficiencies for every 10

000 events.

• Before this run, the beam tuning was done.

Run1770

• Intensity ~ 7kHz• Radfile : 5mA40sec1013

-2.sig, center = 54.7• #Event/Spill ~ 60000• Efficiencies for every 1000

0 events.

Run1789

• Intensity ~ 5kHz• Radfile : 5mA40sec1013

-2.sig, center = 54.7• #Event/Spill ~ 60000• Efficiencies for every 1000

0 events.

• From this run, we checked the rate dependence.

Run1791

• Intensity ~ 1.5kHz• Radfile : 5mA40sec1013

-2.sig, center = 54.7• #Event/Spill ~ 30000• Efficiencies for every 1000

0 events.

Run1793

• Intensity ~ 15kHz• Radfile : 5mA40sec1013

-2.sig, center = 54.7• #Event/Spill ~ 70000• Efficiencies for every 1000

0 events.

Run1795

• Intensity ~ 30kHz• Radfile : 5mA40sec1013

-2.sig, center = 54.7• #Event/Spill ~ 80000• Efficiencies for every 1000

0 events.

• When radiator moved, the efficiency was more stable as the beam intensity was higher.

Run1797

• Intensity ~ 9.5kHz• Radfile : 5mA40secPos35

8.sig• #Event/Spill ~ 70000• Efficiencies for every 1000

0 events.

• From this run, we checked the radiator position dependence.

Run1800

• Intensity ~ 10kHz• Radfile : 5mA40secPos31

0.sig• #Event/Spill ~ 70000• Efficiencies for every 1000

0 events.

Run1802

• Intensity ~ 5kHz• Radfile : 5mA40secPos33

4.sig• #Event/Spill ~ 60000• Efficiencies for every 1000

0 events.

• When the radiator did not move, the efficiency was stable.

• The efficiency was worse as the radiator was near the beam.

Summary?

• The radiator position dependence of the tagging efficiency may be not so small.

• The dependence depends on the beam intensity ( it is improved as the beam intensity was high).

• The efficiency itself is seemed to be improved as the time passed.