Hiroshima Beam Test 2000

We are making a beam test of our baby chamber to study its 2-track separation capability, using electron-positron pairs produced by bremsstrahlung photons from the internal target of REFER (Relativistic Electron Facility for Education and Researches) in Hiroshima University. This page summarizes the current status of the experiment.

What's New?

Schedule

Run Summary

Picture Gallery

What's New?

Jun 15, 2001: Added some figures to Picture Gallery
Oct 06, 2000: This page was created.

Schedule

Sep 24, 2000: Shipping experimental apparatus to Hiroshima.
Sep 25, 2000: Setup.
Sep 26-28, 2000: Trigger System tuning. CsI calibration.
Sep 29, 2000: Test run with the baby chamber.
Sep 30-Oct 1, 2000: Offline analysis.
Oct 2, 2000: Minor modification of trigger system.
Oct 3-5, 2000: Normal incidence, 2-track runs. Installation of the new hodoscopes.
Oct 6, 2000: Test run with the new hodoscopes.
Oct 10, 2000: Normal incidence, 2-track runs w/ hodoscopes.

Run Summary

Run#	#events	Trigger	Target	Chamber Position	Comments
830	300	T1(s).T2(s).CsI	1mm-thick Pb	6.1cm (0cm)	single track/cell 1 T0
832	300	T1(s).T2(s).CsI	1mm-thick Pb	11.1cm (5cm)	single track/cell 2 T0
833	1000	T1(s).T2(s).CsI	1mm-thick Pb	7.1cm (1cm)	single track run
834	1000	T1(d).T2(s).CsI	1mm-thick Pb	7.1cm (1cm)	double track
835	2000	T1(d).T2(s).CsI	1mm-thick Pb	7.1cm (1cm)	double track
836	2000	T1(d).T2(s).CsI	1mm-thick Pb	7.1cm (1cm)	double track
837	2000	T1(d).T2(s).CsI	0.5mm-thick Pb	7.1cm (1cm)	double track
838	100	Clock			pedestal run
840	1000	T1(d).T2(s).CsI	0.25mm-thick Pb	7.1cm (1cm)	double track
841	2000	T1(d).T2(d)	0.25mm-thick Pb	8.6cm (2.5cm)	2-track for T1/2 but w/o CsI
842	1000	T1(d).T2(d).CsI	0.25mm-thick Pb	8.6cm (2.5cm)	restored CsI, two-track run
843	2000	T1(d).T2(d).CsI	0.25mm-thick Pb	8.6cm (2.5cm)	two-track run
844	1000	T1(d).T2(d).CsI	0.25mm-thick Pb	8.6cm (2.5cm)	two-track run
845	355	T1(d).T2(d).CsI	0.25mm-thick Pb	8.6cm (2.5cm)	two-track run
846	100	Clock			pedestal run
847	100	Clock			pedestal run
848	1000	T1(d).T2(d).CsI	0.25mm-thick Pb	9.6cm (3.5cm)	two-track run
849	2000	T1(d).T2(d).CsI	0.25mm-thick Pb	9.6cm (3.5cm)	two-track run
850	2000	T1(d).T2(d).CsI	0.25mm-thick Pb	7.1cm (1cm)	two-track run
851	2000	T1(d).T2(d).CsI	0.25mm-thick Pb	7.1cm (1cm)	two-track run
852	100	Clock			pedestal run
853	100	Clock			pedestal run
854	100	Clock			pedestal run
855	100	Clock			pedestal run
856	500	T1(d).H1sum.H2or.CsI	0.25mm-thick Pb	7.1cm (1cm)	1st run w/hodoscopes
857	374	T1(d).H1sum.H2or.CsI	0.25mm-thick Pb	8.1cm (2cm)	1st run w/hodoscopes
858	501	T1(d).H1sum.H2or.CsI	0.25mm-thick Pb	8.1cm (2cm)	H1(att +20dB for H1sum for ADC)
859	366	T1(d).H1sum.H2or.CsI	0.25mm-thick Pb	8.1cm (2cm)	H1(H1sum thresh. 150mV)
860	1828	T1(d).H1sum.H2or.CsI	0.25mm-thick Pb	8.1cm (2cm)	H1(H1sum thresh. 150mV & att +20dB)
861	100	Clock			pedestal run
862	100	Clock			pedestal run
863	500	T1(d).T2(s).H1sum.H2or.CsI	0.25mm-thick Pb	8.1cm (2.5cm)	restored T2(T2 thresh. 30mV & att +0dB), H1(H1sum thresh. 150mV & att +20dB)
864	500	T1(d).T2(d).H1sum.H2or.CsI	0.25mm-thick Pb	8.1cm (2.5cm)	T2(T2 thresh. 80mV & att +13dB), H1(H1sum thresh. 30mV & att +20dB)
865	500	T1(d).T2(d).H1sum.H2or.CsI	0.5mm-thick Pb	8.1cm (2.5cm)	moved T2(T2 thresh. 80mV & att +13dB), H1(H1sum thresh. 150mV & att +20dB)
866	266	T1(d).T2(d).H1sum.H2or.CsI	0.5mm-thick Pb	8.1cm (2.5cm)	T2(T2 thresh. 80mV & att +13dB), H1(H1sum thresh. 150mV & att +20dB)
867	100	Clock			pedestal run
868	100	Clock			pedestal run
869	500	T1(d).T2(d).H1sum.H2or.CsI	0.5mm-thick Pb	8.1cm (2.5cm)	CsI(CsI thresh. 30mV & att. 12dB), T2(T2 thresh. 80mV & att +13dB), H1(H1sum thresh. 150mV & att +20dB)
870	1000	T1(d).T2(d).CsI	0.25mm-thick Pb	8.1cm (2.5cm)	two-track run
871	2000	T1(d).T2(d).CsI	0.25mm-thick Pb	8.1cm (2.5cm)	two-track run
872	561	T1(d).T2(d).CsI	0.25mm-thick Pb	8.1cm (2.5cm)	two-track run
873	100	Clock			pedestal run
874	100	Clock			pedestal run
875	1000	T1(d).T2(d).CsI	0.25mm-thick Pb	8.1cm (2.5cm)	theta = 30, two-track run
876	2000	T1(d).T2(d).CsI	0.25mm-thick Pb	8.1cm (2.5cm)	theta = 30, two-track run
877	2000	T1(d).T2(d).CsI	0.25mm-thick Pb	8.1cm (2.5cm)	theta = 30, two-track run
878	1300	T1(d).T2(d).CsI	0.25mm-thick Pb	8.1cm (2.5cm)	theta = 30, two-track run
879	100	Clock			pedestal run

Picture Gallery

Very very preliminary offline analysis results ( that might change drastically in future):

Snap-shots of the Experimental Area
Experimental Setup (side view) Run#834 to Run#852(without Run#841) & Run#870 to Run#879
Block Diagram Run#834 to Run#852(without Run#841) & Run#870 to Run#879
Cell Structure of the Baby Chamber
H.V. of each wire and Electric Field
Side view of the Baby Chamber
End plate of the Baby Chamber

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kurihara@jlcux1.kek.jp Oct 6, 2000