INFN wiki

July 10th 2012

Run	time	run conditions	comments
760	12:30	pedestals	ch 0,1,2 with PMTs
761	12:40	LED	HV on
762	13:00	LED	HV on, change timing
763	18:35	electrons but not to chamber	HV 900V
764	19:15	electrons but not to chamber	HV 500V
765	19:45	electrons but not to chamber	HV 500V, ch0 light tight, flanges darkened
766	19:57	electrons but not to chamber	HV 500V, ch0 light tight
767	19:57	electrons but not to chamber	HV 500V, ch0 light tight, dt=150
768	19:57	electrons but not to chamber	HV 500V, ch0 light tight, dt=250
769	20:21	electrons but not to chamber	HV 500V, ch0 light tight, dt=50, magnet on
771-781	22:31	problems after powercut	trigger timing changed
782	0:21	electrons in chamber	HV 500V, all light tight, dt=50, B=0
783	0:21	electrons in chamber	HV 500V, all light tight, dt=50, B=0.45

July 11th 2012

HW changes:

1) the second stage of the dual timer has been replaced by a Stanford for reliable and reproducible setting.
2) all five channels have been equipped with PMT+Electronics
3) the chamber of the spectrometer has been connected with the interaction region (i.e. the glass window removed)
4) a lead collimator has been inserted between the gas jet and the spectrometer

Plan of the day:

A) scan in integration time to find the best timing [with small magnet in]
B) scan in HV to equalize gains [with small magnet in]
C) spectrum with B=0 and B>0 (with small magnet out, having subtracted the common background)

Run	time	run conditions	comments
789	15:47	No Beam HV on ch 0-4 500 V	pedestals
790	16:22	No Beam HV on ch 0-4 900 V	pedestals
793	16:22	electrons	HV=500V. EM Noise is Back!
794-797	17-18	Trigger Test	the trigger doesn't works
798	19:38	T (signal splitting) removed from trigger	the trigger works
799	19:44	HV = 0V, laser+plasma	Electronic noise
800	20:00	HV=0, laser+plasma, reinforce grounding
801	20:04	try HV=500 but impossible to take data
804	22:50	HV=700 PMT 0, HV=0 PMT 1-4	saturation on PMT 0
805	22:52	HV=600 PMT 0 1 2, HV=0 PMT 3 4	now verify that noise on PMT0 increases with num of connected cards
806	23:26	HV=600 PMT 0 1 2, HV=0 PMT 3 4	only card 1 is connected, with the attenuator
807	23:36	HV=600 PMT 0 1 2, HV=0 PMT 3 4	B=0.45T
808	23:47	HV=600 PMT 0 1 2, HV=0 PMT 3 4	B=0.45T, card 1 2 3 are connected with attenuators
809-814	23:59	HV=600 PMT 0 1 2, HV=0 PMT 3 4	B=0, scan in time reveals that t=0 is the best –>anticipate trigger
816-821	24:10	HV=600 PMT 0 1 2, HV=0 PMT 3 4	B=0, scan in time: best timing dt = 100 ns
822	24:27	HV=550 V PMT 0, HV=600 PMT 1 2, HV=0 PMT 3 4	B=0
823	24:30	HV=550 V PMT 0, HV=600 PMT 1 2, HV=0 PMT 3 4	B=0
824	24:37	HV=500 V PMT 0, HV=600 PMT 1 2, HV=0 PMT 3 4	B=0
825	24:37	HV=OFF	B=0
826	24:41	HV=900 PMT 0 1 2	B=0
827	24:45	HV=900 PMT 0 1 2, dt=0	B=0

July 12th 2012

Investigated noise problem. Disappears by using screened cable for DY12

Run	time	run conditions	comments
829	13:29	hv 800 ch 0,1,2	B=0
830	13:32	hv 900 ch 0,1,2	B=0
831	13:35	hv 800 ch 0,1,2	B=0 magnete flame in
832	14:10	hv 500 ch 0,1,2	B=0 magnete flame in remove attenuators
833	14:15	hv 600 ch 0,1,2	B=0 magnete flame in remove attenuators
834-852	15:33	hv 600 ch 0-4	trigger problems
853-858	16:40	hv 600 ch 0-4	time scan
859-870	16:45	hv 500 ch 0-4	time scan
871-872	17:30	HV scan to equalize	establish that HV={580,550,500,480,480}. Found that last two cables are swapped
873	B>0	turn on magnet. Hv default.	Elettroni deviati!!!
874	B>0	magnet ON. HV default	costanti di calibrazione Offline C=(1.2,1,1.5,1.1,1.4)
875	B>0	HV def	Collimatore: 2 blocchetti 5 cm Pb dopo la finestra con 2 mm separazione: 40 mrad * 100 cm –> dx=4 cm
876	B=0	HV def	Collimatore; B ramping down?
877	B=0	HV def	Collimatore
878	B=0	HV def	Collimatore
879	B=0	HV def	Collimatore chiuso; scambiati canali 3 e 4 che erano invertiti; C=(1.2,1,1.5,1.4,1.1)
882	B=0	HV def	Collimatore chiuso
883	B=0	HV def	Collimatore chiuso; Flame Magnet IN; Use for Ped File
884	B=0	HV def	Collimatore aperto 2mm; Flame Magnet OUT; usb problem at the end
885	B=0	HV def	Collimatore aperto 2mm; Flame Magnet OUT
886	B=0	HV def	Collimatore aperto 1cm; Flame Magnet OUT
887	B=0.5 T	HV def	Collimatore aperto 1cm; Flame Magnet OUT

July 13th 2012

Debug of spectrometer trigger. Problems with upper part of logic unit, replaced with lower part. Dual timer removed, veto implemented with Stanford D signal set to 500 mus. Delay and width of trigger button revised, set to 500 mus. Missing alignment with photocatode.

July 18th 2012

Pedestal studies

896	12:21	HV off	Only maroc 0 board+cable; no laser
897	12:26	HV off	Only maroc 0 board+cable; no laser	RMS 12 cts
899	12:26	HV off	Only maroc 0 board no cable; no laser; improved trigger cable	RMS 1.5 cts

Giulietto Felici works on electronics to improve grounding and box.

July 25th 2012

test electronics with new shielding

900	10:37	pedestals	5cards but no cables; RMS 1-2 ADC
901	10:40	pedestals	5cards cable #0 in; HV off; RMS ~6 for first 43 channels, 10-18 for the others
902	10:44	pedestals	5cards cable #0 in; HV=900V; RMS ~6 for first 43 channels, 10-18 for the others
903	10:52	LED run	5cards cable #0 in; HV=900V
904	14:26	pedestals	5cards all cables in; HV=0V
905	14:29	pedestals	5cards all cables in; HV=default
905	14:29	pedestals	5cards all cables in; HV=default – high stat