1. Target Shaft Simulation with G4Beamline M. Apollonio, IC

2. Motivations: Assess better orientation for secondaries production Assess flaws in capture dependent on target position work in progress... a bit of work to generate the secondaries and select only those potentially reaching Q1 bore

3. 10 mm X Z 25 deg Q1-TGT axis 25 deg lost to Q1 secondaries production 20<theta<30 propagation to plane A acos(Pz/Ptot)>20 && acos(Pz/Ptot)<30 rotation & propagation to plane B A A B C shift & align with Q1-TGT axis LONG SLIM

4. 25 deg FAT SHORT TILTED TGT

5. Tgt_long_slim_rot0: y:x Nprimaries=100M

6. Tgt_long_slim_rot0: x {abs(y)<.5 mm} Nprimaries=100M

7. Tgt_long_slim: y:x rotation 25 deg + shift 4.226

8. At Q1 plane, Q1 bore

9. Tgt_tilt25_rot0: y:x Nprimaries=10M

10. Tgt_tilt25_rot0: x {abs(y)<.5 mm} Nprimaries=10M

11. At Q1 plane, Q1 bore

12. Tgt_short_fat_rot0: y:x

13. Tgt_cyl_rot0: y:x

16. shape primaries(p) Dx(mm) h(mm) Q1-bore x-section(mm^2) scal fact Q1-bore resc Status cyl 100M +/-3 4 1464 24 6 8784 short fat 100M +/-5 4 1714 40 10 17140 long slim 100M +/-.5 4 15977 4 1 15977 tilt+25 (\) 100M +/-2.56 4 3092 20.48 5.12 15831 tilt+10 100M +/-1.36 4 6010 10.885 2.7212 16354 tilt-25(/) 100M +/-2.56 4 3300 20.48 5.12 16896 tilt-10 100M +/-1.36 4 6061 10.885 2.7212 16493 long slim 500M short fat 500M +/-5 4 8184 40 10 16368 cyl 500M tilt+25 500M tilt+10 500M fullcyl 5M +/-3 4 194 24 6(x20) 23280 fullcyl 100M

17. lost to Q1 C shift & align with Q1-TGT axis Q1 CAVEAT: take this numbers with a pinch of salt but … 10M beam protons produce: 155K secondaries [20,30]deg of which only ~16K go through the tgt window and reach the Q1 bore Message: what a waste of statistcs !!! Q1 Q1 bore

18. A the idea is assuming a cylindrical simmetry and try to enrich the sample pointing at Q1by rotating the events (x,y,Px,Py) (xr,yr,Pxr,Pyr)

19. I am at this stage: I can create the enriched sample BUT I noticed some strange shapes of y vs x distribution. I am scared something not right in the re-enrichment of the sample I am checking it Once solved I can - shoot these particles into the beamline - rotate the target (see examples next page) - shift the target (and study misalignment) shape primaries(p) Dx(mm) h(mm) Q1-bore x-section(mm^2) scal fact Q1- bore resc Status cyl 100M +/-3 4 1464 24 6 8784 F short fat 100M +/-5 4 1714 40 10 17140 F long slim 100M +/-.5 4 15977 4 1 15977 F tilt+25 (\) 100M +/-2.56 4 3092 20.48 5.12 15831 F tilt+10 100M +/-1.36 4 6010 10.885 2.7212 16354 F tilt-25(/) 100M +/-2.56 4 3300 20.48 5.12 16896 F tilt-10 100M +/-1.36 4 6061 10.885 2.7212 16493 F long slim 500M R short fat 500M +/-5 4 8184 40 10 16368 R cyl 500M R tilt+25 500M R tilt+10 500M R fullcyl 5M +/-3 4 194 24 6(x20) 23280 F fullcyl 100M R