mice beam loss vs particle rate
DESCRIPTION
MICE Beam Loss vs Particle Rate. Adam Dobbs, ISIS Meeting, 18 th December 2009. Outline. Current Beamline Analysis Procedure Latest High Beam Loss (~5V) results Future Plans. Current MICE beamline. D = Dipole bending magnet Q = Quadrupole magnet - PowerPoint PPT PresentationTRANSCRIPT
MICE Beam Loss vs Particle Rate
Adam Dobbs, ISIS Meeting, 18th December 2009
2
Outline Current Beamline Analysis Procedure Latest High Beam Loss (~5V) results Future Plans
18/12/2009A Dobbs
3
Current MICE beamline
18/12/2009A Dobbs
Target
Q1-3
D1 D2 Q4-6 Q7-9
DS
CKOV A, BGVA1
BM1 TOF0
BM2
TOF1
D = Dipole bending magnet Q = Quadrupole magnetDS = Decay solenoid DSA = Decay Solenoid Are a GVA1 = Scintillator counter CKOV = Cherenkov detector BM = Beam Profile Monitor TOF = Time of Flight
ISIS
DSA MICE Hall
4
Beam Loss vs Particle Rate Flow Diagram
18/12/2009A Dobbs
Target DAQ data DATE DAQ data
Data Reduction 1 – fitted peak beam loss analysis, etc
Particle rate data extraction with ScalersAnalysis
Reduced Beam Loss data
Particle Rate data
Combine data by matching time stamps
Combined data (ROOT files)
Data reduction 2: extract means and sigmas for variables on a run-by-run basis
Final plots of beam loss vs particle rate
5
Results
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 50
500,000
1,000,000
1,500,000
2,000,000
2,500,000
3,000,000
3,500,000
GVA1 vs Sector 7 Fit Beam Loss
Magnitude of Sector 7 Fit Beam Loss (V)
Aver
age
GVA
1 du
ring
spi
ll ga
te (
coun
ts /
sec)
18/12/2009A Dobbs
One point = the mean values of the beam loss and particle rate for a run
6 18/12/2009A Dobbs
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 50
200,000
400,000
600,000
800,000
1,000,000
1,200,000
1,400,000
1,600,000
1,800,000
BPM1 vs Sector 7 Fit Beam Loss
Magnitude of Sector 7 Fit Beam Loss (V)
Aver
age
BPM
1 du
ring
spill
gat
e (c
ount
s / se
c)
7 18/12/2009A Dobbs
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 50
200,000
400,000
600,000
800,000
1,000,000
1,200,000
BPM2 vs Sector 7 Fit Beam Loss
Magnitude of Sector 7 Fit Beam Loss (V)
Aver
age
BPM
2 du
ring
spill
gat
e (c
ount
s / se
c)
8
Future Plans
18/12/2009A Dobbs
Another high beam loss study planned for December machine physics period Reproducibility Better statistics (400 – 500 pulses per setting)
Use ToF data Another rate counter PID
Compare with G4BeamLine simulations
9
Preliminary ToF Data for Run 1231
18/12/2009A Dobbs
Produced using G4MICE/TofMonitor
e µ π
10
Analysis Procedure Step I.I – Beam Loss
18/12/2009A Dobbs
Initially for each target dip a whole spectrum of data is present for each variable (black sample spectra shown above). Canonical single values for each variable are calculated from the spectra using BLA Part 2 to given one value for each variable per target dip (fits doing this shown in red). These are written to an ascii file.
Target DAQ data
Reduced Beam Loss data
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Analysis Procedure Step I.II- Particle Rate Held in DATE data stream i.e. in
binary Contains GVA1, BM1, BM2, various
TOF0 and TOF1 data Extracted using a modified version of
G4MICE ScalersAnalysis application Output is an ascii file containing the
number of hits for each detector per spill (i.e. per target dip)
TOF data harder to interpret
18/12/2009A Dobbs
DATE DAQ data
Particle Rate data
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Analysis Procedure Step II- Combine the data Once the beam loss and particle rate data has been
converted to ascii files containing values for each target dip, the data from the two streams must be combined
Data are synchronised using timestamps associated with each target dip data set (the clocks of the two DAQs are synched)
-> Leads to combined data set holding both beam loss and particle rate data per target dip
18/12/2009A Dobbs
Reduced Beam Loss data Particle Rate data
Combined data (ROOT files)
13
Analysis Procedure Step III- extract mean values per run and plot A combined data file is produced for
each run This file is processed using ROOT to
calculate the mean and sigma of each value for a run (a second data reduction) e.g. the mean of GVA1, the mean summed beam loss in sector 7
The values are finally plotted for a series of runs, each having a different nominal beam loss value, but with all other parameters (e.g. Optics) held constant
18/12/2009A Dobbs
Combined data (ROOT
files)
Final plots of beam loss vs particle rate
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Histogramme of GVA1 rate per target dip, for run 1231
18/12/2009A Dobbs
One of the better fits!