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MOLLER Spectrometer Update Juliette M. Mammei. Future Priorities (from last meeting) Physicist input to engineering (highest priority) o Magnetic force.

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Presentation on theme: "MOLLER Spectrometer Update Juliette M. Mammei. Future Priorities (from last meeting) Physicist input to engineering (highest priority) o Magnetic force."— Presentation transcript:

1 MOLLER Spectrometer Update Juliette M. Mammei

2 Future Priorities (from last meeting) Physicist input to engineering (highest priority) o Magnetic force studies o Sensitivity studies o Design of the water-cooling and electrical services o Radiation doses (brought up by companies) Optimization of the optics o He bag/central beam pipe o Multiple magnets o No negative bend o Iron in coils Engineering work (MIT/Bates) o Design of support structure o Vacuum vessel design MOLLER Collaboration Meeting May 8,9 2014 2 Lower priority

3 Forces with asymmetric coils – http://ace.phys.virginia.edu/MollerSpectrometer/297 (Jason) http://ace.phys.virginia.edu/MollerSpectrometer/297 – http://ace.phys.virginia.edu/MollerSpectrometer/298(Juliette) http://ace.phys.virginia.edu/MollerSpectrometer/298 – http://ace.phys.virginia.edu/MollerSpectrometer/299(Juliette) http://ace.phys.virginia.edu/MollerSpectrometer/299 – http://ace.phys.virginia.edu/MollerSpectrometer/300(Juliette) http://ace.phys.virginia.edu/MollerSpectrometer/300 Radiation dose on coils – http://ace.phys.virginia.edu/MollerSpectrometer/305(Tyler) http://ace.phys.virginia.edu/MollerSpectrometer/305 – http://ace.phys.virginia.edu/MollerSpectrometer/306(Seamus) http://ace.phys.virginia.edu/MollerSpectrometer/306 Coil sensitivities – http://ace.phys.virginia.edu/MollerSpectrometer/287 (Sakib, Juliette preliminary) http://ace.phys.virginia.edu/MollerSpectrometer/287 – http://ace.phys.virginia.edu/MollerSpectrometer/308(Tyler) http://ace.phys.virginia.edu/MollerSpectrometer/308 – See slides Support Structure – See slides Vacuum vessel – See slides MOLLER Collaboration Meeting May 8,9 2014 3 Bids

4 Forces MOLLER Collaboration Meeting May 8,9 2014 4 New Old Coil off Forces on coil to beam left with adjacent coil off

5 Forces MOLLER Collaboration Meeting May 8,9 2014 5 Old New Coil off

6 MOLLER Collaboration Meeting May 8,9 2014 6 Sensitivity Studies Need to consider the effects of asymmetric coils, misalignments etc. on acceptance This could affect our manufacturing tolerances and support structure Have created field maps for a single coil misplaced by five steps in: – -1° < pitch < 1° – -4° < roll < 4° – -1° < yaw < 1° – -2 < r < 2 cm – -10 < z < 10 cm – -5° < φ < 5° Axes in frame of single coil

7 MOLLER Collaboration Meeting May 8,9 2014 7 We’ll measure a certain rate R and asymmetry A in each septant. We assume the allowable uncertainty on A to be 0.1 ppb Sensitivity Studies

8 MOLLER Collaboration Meeting May 8,9 2014 8

9 Asymmetry vs. position offset

10 Asymmetry vs. rotation offset

11 Preliminary Results MOLLER Collaboration Meeting May 8,9 2014 11 Mean Asymmetry a (ppb)b Z31.75-0.01 ppb/cm R31.750.34 ppb/cm T31.74-0.01 ppb/degree Roll31.720.04 ppb/degree Yaw31.750.06 ppb/degree Pitch31.77-0.13 ppb/degree -9.24cm 2.94mm -17.86° 2.28° 1.59° -0.75° (>10 cm over magnet length) What about physical constraints?

12 MOLLER Collaboration Meeting May 8,9 2014 12

13 Closest approach MOLLER Collaboration Meeting May 8,9 2014 13

14 Summary MOLLER Collaboration Meeting May 8,9 2014 14 These results have some simulations with same random seed (statistical uncertainty is not as good as it seems) – Need to re-run those simulations and redo the results – All plots vs. offset treated as linear, though some clearly are not Very preliminary results show order ~3 mm sensitivities (not sub-mm) Need to look at the effect of tracking algorithm with incorrect maps What is the most important parameter – what is it that will determine the sensitivity – A background correction done incorrectly? – The mean asymmetry, as I’ve assumed here? – The mean θ lab, which will go into the extraction of sin 2 θ W ?

15 Neutron shielding MOLLER Collaboration Meeting May 8,9 2014 15

16 Radiation dose MOLLER Collaboration Meeting May 8,9 2014 16

17 Support Structure MOLLER Collaboration Meeting May 8,9 2014 17

18 Frame Design MOLLER Collaboration Meeting May 8,9 2014 18

19 Vacuum Chamber design MOLLER Collaboration Meeting May 8,9 2014 19

20 Cut away views MOLLER Collaboration Meeting May 8,9 2014 20

21 Stress and deformation analysis MOLLER Collaboration Meeting May 8,9 2014 21

22 Bids? MOLLER Collaboration Meeting May 8,9 2014 22

23 Extra Slides MOLLER Collaboration Meeting May 8,9 2014 23

24 (Rate weighted 1x1cm 2 bins) Tracks in GEANT4 for nominal field MOLLER Collaboration Meeting May 8,9 2014 24 Mollers eps

25 MOLLER Collaboration Meeting May 8,9 2014 25

26 MOLLER Collaboration Meeting May 8,9 2014 26

27 MOLLER Collaboration Meeting May 8,9 2014 27

28 z coll =590cm z targ,up =-75cm z targ,center =0cm z targ,down =75cm θ low =5.5mrad θ high =17mrad R inner =3.658cm R outer =11.306cm From center:From downstream: θ low,cen =6.200mradsθ low,down =7.102mrads θ high,cen =19.161mradsθ high,down =21.950mrads Finite Target Effects R inner R outer z targ,down z targ,up z targ,center θ low,up θ low,down θ high,up θ high,down Assume 5.5 mrads at upstream end of target, instead of center

29 Looking downstream x y φ=-360°/14 φ=+360°/14 ͢ B r φ In this septant: B y ~ B φ B x ~ B r ByBy BxBx ByBy BxBx 29 MOLLER Collaboration Meeting May 8,9 2014

30 GEANT4 MOLLER Collaboration Meeting May 8,9 2014 30 Moved to GDML geometry description Defined hybrid and upstream toroids Parameterized in same way as the TOSCA models

31 GEANT4 - Collimators MOLLER Collaboration Meeting May 8,9 2014 31

32 GEANT4 – Acceptance definition MOLLER Collaboration Meeting May 8,9 2014 32

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