MOLLER Spectrometer Update Juliette M. Mammei. Future Priorities (from last meeting) Physicist input...
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Transcript of MOLLER Spectrometer Update Juliette M. Mammei. Future Priorities (from last meeting) Physicist input...
![Page 1: MOLLER Spectrometer Update Juliette M. Mammei. Future Priorities (from last meeting) Physicist input to engineering (highest priority) o Magnetic force.](https://reader035.fdocuments.us/reader035/viewer/2022062804/56649f0d5503460f94c210a2/html5/thumbnails/1.jpg)
MOLLER Spectrometer Update
Juliette M. Mammei
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MOLLER Collaboration Meeting May 8,9 2014
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Future Priorities (from last meeting)
• Physicist input to engineering (highest priority)o Magnetic force studieso Sensitivity studieso Design of the water-cooling and electrical serviceso Radiation doses (brought up by companies)
• Optimization of the opticso He bag/central beam pipeo Multiple magnetso No negative bendo Iron in coils
• Engineering work (MIT/Bates)o Design of support structureo Vacuum vessel design
Lower priority
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MOLLER Collaboration Meeting May 8,9 2014
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• Forces with asymmetric coils
– http://ace.phys.virginia.edu/MollerSpectrometer/297 (Jason)– http://ace.phys.virginia.edu/MollerSpectrometer/298 (Juliette)– http://ace.phys.virginia.edu/MollerSpectrometer/299 (Juliette)– http://ace.phys.virginia.edu/MollerSpectrometer/300 (Juliette)
• Radiation dose on coils
– http://ace.phys.virginia.edu/MollerSpectrometer/305 (Tyler)– http://ace.phys.virginia.edu/MollerSpectrometer/306 (Seamus)
• Coil sensitivities
– http://ace.phys.virginia.edu/MollerSpectrometer/287 (Sakib, Juliette preliminary)– http://ace.phys.virginia.edu/MollerSpectrometer/308 (Tyler)– See slides
• Support Structure– See slides
• Vacuum vessel– See slides
Bids
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MOLLER Collaboration Meeting May 8,9 2014
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Forces
NewOld
Coil offForces on coil to beam left with adjacent coil off
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MOLLER Collaboration Meeting May 8,9 2014
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Forces
Old
New
Coil
off
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MOLLER Collaboration Meeting May 8,9 2014
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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
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MOLLER Collaboration Meeting May 8,9 2014
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Slopes give, for example,
Then , the uncertainty in z allowed
What are the relevant ,, ,
Our ability to determine in that septant may also be important.
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
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MOLLER Collaboration Meeting May 8,9 2014
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Asymmetry vs. position offset
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Asymmetry vs. rotation offset
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MOLLER Collaboration Meeting May 8,9 2014
Preliminary Results
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Fit to plots is given by
in range where approximately linear
Mean Asymmetrya (ppb) b
Z 31.75 -0.01 ppb/cmR 31.75 0.34 ppb/cmT 31.74 -0.01 ppb/degree
Roll 31.72 0.04 ppb/degreeYaw 31.75 0.06 ppb/degreePitch 31.77 -0.13 ppb/degree
= -9.24cm = 2.94mm = -17.86° = 2.28° = 1.59° = -0.75°
where
Then, for example,
(>10 cm over magnet length)
What about physical constraints?
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Closest approach
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MOLLER Collaboration Meeting May 8,9 2014
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Summary• 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 θlab, which will go into the extraction of sin2θW?
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Neutron shielding
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MOLLER Collaboration Meeting May 8,9 2014
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Radiation dose
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MOLLER Collaboration Meeting May 8,9 2014
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Support Structure
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MOLLER Collaboration Meeting May 8,9 2014
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Frame Design
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MOLLER Collaboration Meeting May 8,9 2014
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Vacuum Chamber design
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MOLLER Collaboration Meeting May 8,9 2014
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Cut away views
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MOLLER Collaboration Meeting May 8,9 2014
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Stress and deformation analysis
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MOLLER Collaboration Meeting May 8,9 2014
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Bids?
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MOLLER Collaboration Meeting May 8,9 2014
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Extra Slides
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MOLLER Collaboration Meeting May 8,9 2014
24(Rate weighted 1x1cm2 bins)
Tracks in GEANT4 for nominal field
Mollers
eps
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MOLLER Collaboration Meeting May 8,9 2014
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Slopes give, for example,
Then , the uncertainty in z allowed
What are the relevant ,, ,
We’ll measure a certain R and A in each septant. What matters is our ability to determine in that septant.
𝑄2=4𝐸𝐸 ′ 𝑠𝑖𝑛2𝜃𝑙𝑎𝑏
2
𝛿𝑄2=(𝜕𝑄2
𝜕𝐸 )2
(𝛿𝐸 )2+( 𝜕𝑄2
𝜕𝐸 ′ )2
(𝛿 𝐸 ′ )2+( 𝜕𝑄2
𝜕𝜃 𝑙𝑎𝑏)2
(𝛿𝜃𝑙𝑎𝑏 )2
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MOLLER Collaboration Meeting May 8,9 2014
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Assuming
𝛿𝑄2=(𝜕𝑄2
𝜕𝐸 )2
(𝛿𝐸 )2+( 𝜕𝑄2
𝜕𝐸 ′ )2
(𝛿 𝐸 ′ )2+( 𝜕𝑄2
𝜕𝜃 𝑙𝑎𝑏)2
(𝛿𝜃𝑙𝑎𝑏 )2
The uncertainty on is:
~ 0.001 GeV ~ 0.001 GeV
~ 1.33 GeV2/rad
𝛿𝑄2
1.33𝐺𝑒𝑉 2/𝑟𝑎𝑑=𝛿𝜃𝑙𝑎𝑏=
(0.005 ) ( .0058GeV 2 )1.33𝐺𝑒𝑉 2/𝑟𝑎𝑑
=2×10−5𝑟𝑎𝑑
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zcoll = 590cm
ztarg,up = -75cmztarg,center = 0cmztarg,down = 75cm
θlow = 5.5mradθhigh = 17mrad
Rinner = 3.658cmRouter = 11.306cm
From center: From downstream:
θlow,cen = 6.200mrads θlow,down = 7.102mradsθhigh,cen = 19.161mrads θhigh,down = 21.950mrads
Finite Target Effects
Rinner
Router
ztarg,downztarg,up ztarg,center
θlow,up
θlow,down
θhigh,up
θhigh,down
Assume 5.5 mrads at upstream end of target, instead of center
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MOLLER Collaboration Meeting May 8,9 2014
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Looking downstream
x
y
φ=-360°/14
φ=+36
0°/1
4
S
B
r
φIn this septant:
By ~ Bφ
Bx ~ Br
By
Bx ByBx
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MOLLER Collaboration Meeting May 8,9 2014
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GEANT4• Moved to GDML geometry description• Defined hybrid and upstream toroids• Parameterized in same way as the TOSCA models
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MOLLER Collaboration Meeting May 8,9 2014
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GEANT4 - Collimators
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MOLLER Collaboration Meeting May 8,9 2014
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GEANT4 – Acceptance definition