Cryo-target wall contamination

The normalized yield is equal to Ngood/Q/density. Here I neglected the density of the 3He gas.

Kinematic 5.2

Target	window thickness		Total charge	# of good evts
	upstream	downstream
He3	0.0274 cm	0.0328 cm	6.92E+8	253254
Dummy	0.1581 cm	0.1585 cm	2.16E+8	3588

Result: An estimate of 2186 events wall events remains within the cut ==> Contamination is less than 1%.

Kinematic 6.5

Target	window thickness		Total charge	# of good evts
	upstream	downstream
He3	0.0274 cm	0.0328 cm	1.045E+9	110050
Dummy	0.1581 cm	0.1585 cm	1.316E+7	294

Result: An estimate of 4439 events wall events remains within the cut ==> Contamination is 4%.

• With the full statistic collected till run 4039 (the last plot has the dummy histo multiply by 30) and the following cuts were applied to 3He and dummy runs:

 -  sprintf(cutnom,"L.tr.n==1 && DBB.edtpr[0]==0 && (DBB.evtypebits>>3)&1");
 -  sprintf(cutdum_y,"abs(L.tr.tg_y-0.0025)<0.030"); or sprintf(cuthe_y,"abs(L.tr.tg_y)<0.030");
 -  sprintf(cutphi,"abs(L.tr.tg_ph)<0.020");
 -  sprintf(cuttheta,"abs(L.tr.tg_th)<0.040");
 -  sprintf(cutcer,"L.cer.asum_c>300 && L.cer.asum_c<8000");
 -  sprintf(cutcalo,"(L.prl1.asum_c+L.prl2.asum_c)>1000");
 -  sprintf(cutdum_all,"%s && %s && %s && %s && %s && %s", cutnom, cutdum_y, cutphi, cuttheta, cutcer, cutcalo); or sprintf(cuthe_all,"%s && %s && %s && %s && %s && %s", cutnom, cuthe_y, cutphi, cuttheta, cutcer, cutcalo);