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Nuruzzaman(http://www.jlab.org/~nur/)
Hampton University Group Meeting1st November 2011
Beamline Optics Using Beam Beamline Optics Using Beam Modulation for the Q-weak Modulation for the Q-weak
ExperimentExperiment
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OverviewOverview
• Basics
• Hardware for beam modulation
• Controls and software
• Data analysis
• Optics stability during RUN-I
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The objective of the Qpweak experiment is to measure the parity violating asymmetry
(~250ppb) in elastic electron-proton(e-p) scattering to determine the proton's weak charge with an uncertainty of 4%.[1]
[1] http://www.jlab.org/qweak/
APV = σ+ - σ-_______σ+ + σ-
The e-p scattering asymmetry depends on the five beam parameters: horizontal position (X), horizontal angle (X΄), vertical position (Y), vertical angle (Y΄) and energy (E).
Ameasured = A0 + ∂A ∂Ti
∆Ti ∑i
Ti = X, X´, Y, Y´ & E∂Ti ∂A
= detector sensitivity
The goal of the Injector group is to keep these helicity-correlated parameters as small as possible.
The goal of our beam modulation group is to measure the detector sensitivities to correct remaining false asymmetry.
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2.5% on APV 4% on Qweak 0.3% on sin2 θW
Uncertainty δAPV/APV δQw/Qw
Statistical (~2.5K hours at 150 μA) 2.1% 3.2%
Systematic: 2.6% Hadronic structure uncertainties --- 1.5% Beam polarimetry 1.0% 1.5% Effective Q2 determination 0.5% 1.0% Backgrounds 0.5% 0.7% Helicity-correlated beam properties 0.5% 0.7%
Total: 2.5% 4.1%
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1st Coil 2nd Coil
Dipole 3C05 Dipole 3C06 Dipole 3C07
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Hall C Beamline
Zoomed In
Target
z
x / y
θ1
θ2θ1
III
Z=0 Z=d1 Z=d2
2 1 1
1 1
(d d ) 1θ = T T
d d
2
2 1 1
d 1θ = T T
d d m m
m m
T = X Y
T = X Y
Where
Ref: http://www-bdnew.fnal.gov/pbar/organizationalchart/lebedev/OptiM/optim.htm
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Beam Parameter
Modulation Amplitude
Current through 1st Coil
I1 (A)
Field Integrals
for 1st CoilBdL1 (G-cm)
Current through 2nd
Coil I2 (A)
Field Integrals
for 2nd CoilBdL2 (G-cm)
Tune Parameters
(BdL2 / BdL1)
X 159 μm 0.088 29.0 -0.300 -99.0 -3.414
X΄ 3.1 μrad 0.052 17.0 -0.300 -99.0 -5.824
Y 84 μm -0.300 -99.0 0.136 45.0 -2.200
Y΄ 2.1 μrad -0.300 -99.0 0.150 49.5 -2.000
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Beam Position Monitor
Modulation Coil Pair
Hall-C
Injector
Accelerator
1st Pair of
Coils
2nd Pair of Coils
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ABC
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35 cm Liquid Hydrogen Target
Polarized Electron Beam
Collimator With Eight Openings = 9 ± 2°
Toroidal Magnet
Eight Fused Silica (quartz)Cerenkov Detectors
5 inch PMT in Low GainIntegrating Mode on Each
End of Quartz Bar
Elastically Scattered Electrons
325 cm
580 cm
LuninosityMonitor
Region 3Drift Chambers
Region 2Drift Chambers
Region 1GEM Detectors
35 cm Liquid Hydrogen Target
Primary Collimator with 8 openings
Drift Chambers
Toroidal Magnet
Drift Chambers
Elastically Scattered Electron
Eight Fused Silica (quartz) Čerenkov Detectors - Integrating Mode
Luminosity Monitors
~3.2 m
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Beamline
CoilsX1
Y1
Y2
X2
SRFE
BSY Service Building
BMOD1
X1Y1X2Y2
LEMCurrent
Transducer
X1Y1
Y2
X2
TRIM-IPower Amp.
BPMs
BMOD2
Hall-C
GUI
CONSOLE
Qpweak
PV Daq.
Qpweak Cage
IOChCnmr
TRIUMF
ADC
JLAB
ADC
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Bench Test and ResultsBench Test and Results
VME Signal
Generator
IOC
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We choose frequency 125 Hz to be in linear region
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X X´Y Y´E
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Phase
Phase
Phase
Phase
FG
X1
[V]
FG
X2
[V]
BP
MX
[m
m]
BP
MY
[m
m]
Target BPM Response to X ModulationTarget BPM Response to X Modulation
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Run 11116: Hall-C BPM X Response to X Modulation
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Run 11116: Hall-C BPM X Response to X Modulation
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Run 11116: Hall-C BPM Y Response to Y Modulation
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Run 11116: Hall-C BPM X Response to E Modulation
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Run 11116: BPM Response to X Modulation
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General InformationGeneral Information
Run conditions:•Production running•Beam current: 150 -180 µA•Modulation with pair of coils•Modulation frequency: 125 Hz•Three modulation tunes (I2/I1) : I, IIA, IIB
This presentation includes:•Time span: 14th February – 13th May 2011•Run range covered: 10,046 – 12,120 •Mps_Tree
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Non-zero X-Y coupling at target become
obvious here
BPM Response to X Modulation During RUN-I
Small drifts in X !
BM
od P
ositi
on A
mpl
itude
[m
m]
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BPM Response to X Modulation During RUN-I
Wien 1 Wien 2 Wien 3 Wien 4 Wien 5
Are these fluctuations due to FG drive signals ?
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X-Y Correlation for X Modulation During RUN-I
Hypothesis:•Sick quadrupole downstream of 3C12•Problem in Xtgt, Ytgt amplitude
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Ytgt is relatively unstable for Y modulation:•Designed that way
BPM Response to Y Modulation During RUN-I
BM
od P
ositi
on A
mpl
itude
[m
m]
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BPM Response for Y Modulation During RUN-I
Wien 1 Wien 2 Wien 3 Wien 4 Wien 5
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X-Y Correlation to Y Modulation During RUN-I
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Ytgt (≥Xtgt) has ~ 1/7th dispersion of 3C12X
BPM Response to E Modulation During RUN-I
BM
od P
ositi
on A
mpl
itude
[m
m]
Residual dispersion
coming from upstreamB
Mod
Pos
ition
Am
plitu
de [
mm
]
Run 11116: Hall-C BPM Y Response to E Modulation
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BPM Response to E Modulation During RUN-I
Wien 1 Wien 2 Wien 3 Wien 4 Wien 5
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X-Y Correlation for E Modulation During RUN-I
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SummarySummary
Coil positioning has been defined by using OPTIM, and hardware has been installed.
We did bench test with modulation hardware before installation.
Hardware and software worked fine during RUN-I period.
Analyzing data from RUN-I …….
X modulation:Xtgt and Ytgt are relatively unstable, has slow drifts and glitches.•Sick quad, problems with Xtgt and Ytgt amplitude ?•Co-related X-Y coupling.BPM 3C12 X and Y responses are relatively stable.
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SummarySummaryY modulation:Ytgt response is significantly unstable.•Designed that way (tune parameters for Y and Y´ are close).Xtgt, BPM 3C12 X and Y responses are relatively stable.•No obvious X-Y coupling.
E modulation:Non zero Xtgt & Ytgt motion.•Residual dispersion coming from upstream of BPM 3C07A !
To DoTo Do•Track down reasons for outliers.
•Discuss with MCC to reliably reduce the residual dispersion at target (It may help Compton background).
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ReferencesReferences
Other Optics Related Changes
02/17/11 Injector transmission problem, beam steering: ELOG 156884904/13/11 Raised Hall-C laser GSET: ELOG 157917404/14/11 Hall-C laser phase adjustment: ELOG 157921804/22/11 Moller quad adjustment: ELOG 158316804/23/11 Optics change: ELOG 158714005/02/11 2L06-1 common fault dropped to idle: ELOG 162507205/02/11 30hz synchronization errors: ELOG 1625050 05/04/11 Hall-C Moller quads cycled: ELOG 162703305/05/11 Hall-C Moller quads are on: ELOG 1627277
Injector Spot Moved
02/14/11: ELOG 1568337 04/20/11: ELOG 158036802/25/11: ELOG 1570886 04/25/11: ELOG 159640803/01/11: ELOG 1572026 04/29/11: ELOG 161331503/24/11: ELOG 1576310 05/03/11: ELOG 162674004/03/11: ELOG 1577478 05/10/11: ELOG 162831704/07/11: ELOG 1578273
QTOR Corrector Magnet
Q-weak QTOR ELOG
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Back up
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BPM3C12
Target BPM
Run 11116: Hall-C BPM X Response to X Modulation
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Hint of correlation
X-Y Correlation to X Modulation During RUN-I
BM
od Y
Ta
rget
Pos
ition
Am
plitu
de
[mm
]
BMod X Target Position Amplitude [mm]39
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X-Y Correlation to Y Modulation During RUN-I
BM
od Y
Ta
rget
Pos
ition
Am
plitu
de
[mm
]
BMod X Target Position Amplitude [mm]40
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X-Y Correlation to E Modulation During RUN-I
BM
od Y
Ta
rget
Pos
ition
Am
plitu
de
[mm
]
BMod X Target Position Amplitude [mm]41
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Run 11116: Hall-C BPM Y Response to Y Modulation
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Run 11116: Hall-C BPM X Response to E Modulation
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Run 11116: Hall-C BPM X Response to X Angle Modulation
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Run 11116: Hall-C BPM Y Response to Y Angle Modulation
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Linked Slide
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Unstable beam vacuum problem
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Large charge asymmetry & BPM
differences
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Unstable beam vacuum problem
Feedback test
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Orbit lock moved
Beam profile scan
Compton lock might be incorrect
Unstable beam
QTOR failure & MCC valve
problem
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X-Y Correlation to Modulation During RUN-I
BM
od Y
Ta
rget
Pos
ition
Am
plitu
de
[mm
]
BMod X Target Position Amplitude [mm]82
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Qweakp 1 4 sin2 W ~ 0.072
Qweakp 1 4 sin2 W ~ 0.072 (at tree level)
QpWeak : extract from Parity-Violating Electron Scattering
measures Qp – proton’s electric charge measures QpWeak
– proton’s weak charge
MEM MNC
(as Q2 0 )
Correction involves hadron form factors. Determine using global analysis of recently completed PVES experiments.
The lower the momentum transfer, Q, the more the proton looks point-like; form factor corrections get less important.
“accidental” suppression of Qwp enhances sensitivity to new physics
83
APV
N N
N N
2MNC
MEM
G
F
4 2
Q2 Q
weakp Fp Q2 ,
Q2 0 0
GF
4 2
Q2 Q
weakp Q4B Q2
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84SM curve by: J. Erler, M. Ramsey-Musolf and P. Langacker
Qweakdecreasing
Qweakincreasing
Running of sin2 θW
Q [GeV]