LBNF/NuMI-Style target, for Horn A, revision 2, & other - - PowerPoint PPT Presentation

Nov 17 2016 NuMI Target upgrade, + others 1

LBNF/NuMI-Style target, for Horn A, revision 2, & other upgrades.

Paul Lebrun ND/Fermilab.

Nov 17 2016 NuMI Target upgrade, + others 2

A confusing sequence of code upgrades.. I

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HornA, revision 2 => Coded up.

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Target: revised:

– Vertically expanded fins 20 mm

24 26 mm → →

– Fin width: 10 or 13.4 mm – Cooling tubes : 4 mm OD (was 3 before) – Recoded volume hierarchy & “rounding” – Helium container It was (wrongly!) still made of Beryllium.

We agreed sometimes ago, to use titanium... ==> an other change.

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Horn B, revision 2: Not yet! So, right now, mismatch if we use all “relastic horns”.

Nov 17 2016 NuMI Target upgrade, + others 3

As usual, encountered bugs..

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Always a bit tedious to code the geometry... Volume by volume... But, getting a bit more proficient at it.. I think.. already too old to tell)

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Then, every ~10,000 events (Importance weight set to 1.), crash in Geant4 geometry navigation class, fatal.. The IC and it’s mother volume is nearly // of the Z axis, the presence of these two volumes seems to trigger confusions among which volumes crossings coordinates should be used, for some rare tracks..

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G4 bug lists seemed to indicate that this is solved in v4.10.2

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Installed it, minor modification in the LBNEG4Visualiztion class, it complies and runs..

Nov 17 2016 NuMI Target upgrade, + others 4

For the Idealistic Horns (v4.10.1 bug not encountered..)

O.K. ! We will move soon to v4.10.2 Yes, there is a Dk2nu library

Nov 17 2016 NuMI Target upgrade, + others 5

Back to NuMI target, 2 meter long in either “idealistic” and “Realistic (Rev 2, Cory C. drawing) Usual verification with geantinos

Nov 17 2016 NuMI Target upgrade, + others 6

Helium container Vessel .. (Was Beryllium! Changed to Titanium) Alignment ring (6+ 1) Cooling Tubes, Titanium (OD = 8 mm, 0.5 mm wall thickness) Graphite Water Note: this plot was made with fin heights of 24 mm. Now, it is 26 mm

Nov 17 2016 NuMI Target upgrade, + others 7

Elevation view. Same color convention Z [mm]

Nov 17 2016 NuMI Target upgrade, + others 8

Plan View, One fin + boundary. The true fins are “rounded”, which requires once again volume diviison and/or subtraction. Ease the shape, implemented these cuts as rectangled parallelepiped. Same carved out volume as in the real fins.

Nov 17 2016 NuMI Target upgrade, + others 9

Fins with “wings” They are cylindrical instead of rectangular parallelepipeds, but carves. Note that they are better cooled (more surface contact with the graphite. For now, not rounded at the ends, but slightly shorter in length than 20 mm.

Nov 17 2016 NuMI Target upgrade, + others 10

Effect of the Beryllium/Titanium Helium Containment vessel.

Idealistic horns

Nov 17 2016 NuMI Target upgrade, + others 11

Effect of the Beryllium/Titanium Helium Containment vessel.

Idealistic horns Realistic horns (Horn A rev2, B/B, 1)

Nov 17 2016 NuMI Target upgrade, + others 12

Realistic Horn A + Tgt, 10 mm vs 13 mm

Nov 17 2016 NuMI Target upgrade, + others 13

Realistic Horn A + Tgt, 10 mm vs 13 mm

This was done with the 24 mm fin width height, Titanium Helium container vessel (50 mm OD). This is comparing the nm fluxes at the Far detector... Complicated behavior, and different for π+ and π-..

Nov 17 2016 NuMI Target upgrade, + others 14

Similar behavior for the Near Detector flux.

Nov 17 2016 NuMI Target upgrade, + others 15

There were also difference when we upgrade the target,

• Oct. 2016.

Far detector.., νµ ν mode This is with “Idealistic” Horns, Optimizer run CP_run26_8079 Old target had 20 mm height fins, 3 mm cooling tubes. Beryllium Helium

• cont. vessel. ..New target, 24 mm height, 4 mm cooling tubes, Titanium

He cont. vessel... 40 cm longer !.

Nov 17 2016 NuMI Target upgrade, + others 16

6 fins with wings vs 3.. Little difference...

Pursue with more fins.. Not really needed if 6 fins is all we need...

Nov 17 2016 NuMI Target upgrade, + others 17

Next Steps...

To be discussed... Need a bit of guidance. Note: very limited man-power at this stage, as I have to go back to the spectrometer. More such studies, to understands quantitatively the potential loss of performance for each engineering-driven decision. (fin heights, # of wings, ajutment of IC profile.. ) Implement Horn B, revision 2 (awaiting from Nx9 CAD package..) Then, go back to the “Idealistic” version, as said above, qunatify, and, then, “haggle a bit”, to converge towards an actual design.

Nov 17 2016 NuMI Target upgrade, + others 18

Case in point. Horn A, revision 2. Received from Laura the IC profile used in the optimization

/LBNE/det/Horn1PolyPt0RinThickZ 354.22198954 2.000 0.00 mm /LBNE/det/Horn1PolyPt1RinThickZ 42.8603255641 2.000 1.00 mm /LBNE/det/Horn1PolyPt2RinThickZ 42.8603255641 2.000 1168.65651218 mm /LBNE/det/Horn1PolyPt3RinThickZ 21.1025327033 2.000 2219.9071543 mm /LBNE/det/Horn1PolyPt4RinThickZ 354.22198954 2.000 2220.9071543 mm /LBNE/det/Horn1PolyOuterRadius 369.22198954 mm

The Horn A IC radius there is 33 mm, not 21 mm .. (Can't be less than 25 + few mm, He Cont. vessel.... ) Need to re-run specific set of “Optimized, idealistic/realsitic designs”

Nov 17 2016 NuMI Target upgrade, + others 19

Finally, “Softwarology work”, such G4 upgrades, how to handle Spectrometer sim new package, or sub-package, etc...