m. apollonio
-
Upload
xavier-caldwell -
Category
Documents
-
view
29 -
download
2
description
Transcript of m. apollonio
m. apollonio
7/7/2010 CM27 - RAL 11
Beam-Line Analysis …
7/7/2010 CM27 - RAL 22
what a summer …
335000 target dips into ISIS … 13000000 particle triggers 1500 runs 16 hours shift rotas MOMs BLOCs experts and to finish with …
… fireworks at 10V !
VERY IMPORTANT: system was really stable, reliableAnd it looks like data are in good shape
7/7/2010 CM27 - RAL 3
The MICE Beam-Line
7/7/2010 CM27 - RAL 4
(x0,y0) (x1,y1)
M: transfer matrix
Infer x0’ and x1’ from x0,x1
Reconstruct:- P- phase space- Twiss Parameters- emittance
TOF0 and 1 play a crucial role in thisanalysis
TOF (0,1,2)
7/7/2010 CM27 - RAL 5
OnLine Phase Space Reconstruction
Beam Line Online Tuning
Tried also an OL optimisation(very slow)
7/7/2010 CM27 - RAL 6
Analysis
- Commissioning and calibrating the beam line detectorsa)Luminosity Monitorb)TOF0, 1, 2 / CKOVa, bc)FermiLab Beam Profile Monitors- Commissioning the BL magnets- determine the (e,P) matrix- compare data to simulation- Beam rate vs Target Depth
Procedure:- data taking campaign at many different optics- mainly scan of quadrupoles/triplets to study the effect on ph-space- scan of DS- monitoring of main scalers / detectors (TOFs)- Use of Reference Runs to monitor optics stability- mu- / mu+ configurations
DS scan [E. Chng, IC]
• DS current reference at 669 Amps(run 2200)• DS current varied from -15% to +20%• TofTree and TofTrace ran on data to extract mean of x,y and the spread of
the beam (σ) at TOF1
Run Number 2191 2192 2193 2195 2196 2197 2198 2200
Current / Amps 736 602 803 769 702 635 568 669
Ref. Current
7/7/2010 CM27 - RAL 7
7/7/2010 CM27 - RAL 8
Beam Characterization [M. Rayner]
- Cumulative spectrum of Dt - Comparison Feb./Aug. TOF Calibrations- Change in shape due to TOF0Partially “blind” & BL dispersion
e-/e+ peak monitoring- position & width should be stable
7/7/2010 CM27 - RAL 9
Few points: - a shift in calibration (10 ps) between Feb. and Aug.- RMS nearly constant: 120 ps ≠ (60 50)⊕- so we are not exploiting the full potential of TOFs resolution
7/7/2010 CM27 - RAL 10
M.R. Feb. calibration
Aug. calibration
E.C. Same pattern, shift of 0.5 ns due to wrong calib file used (debugging now)
E.C. gauβ fitTo e- peak
7/7/2010 CM27 - RAL 11
Beam Characterization [R.R.Fletcher]
- Neutral Particles responsible for an apparent Trigger inefficiency
BL+ with D2=0
BL+ with D2 ON
7/7/2010 CM27 - RAL 12
Beam Characterization [A.Dobbs]
- Adam had a chance at 10 V … and he did not miss it!- soon in a MICE-note
7/7/2010 CM27 - RAL 13
Quadrupole Scan(s) [S. Blot]
Q789 (- / +) and Q456 (+)
I(triplet) = 050% to 175% of the nominal valueSee effect on beam profilesand phase space
7/7/2010 CM27 - RAL 14
Q789 (-)G4BeamLine
DATA
7/7/2010 CM27 - RAL 15
7/7/2010 CM27 - RAL 16
7/7/2010 CM27 - RAL 17
7/7/2010 CM27 - RAL 18
MC (G4Beamline)
DATA M0 10-240
Phase Space study for some Matrix Points
7/7/2010 CM27 - RAL 19
MC (G4Beamline)
DATA M1 10-240
7/7/2010 CM27 - RAL 20
DATA M0 6-240 G4Beamline
P=[200,210] P=[200,210]
P=[210,220]
P=[220,230]
P=[230,240]
P=[210,220]
P=[220,230]
P=[230,240]
???
This result is in disagreement with what found previously … needs some investigation
7/7/2010 CM27 - RAL 21
Many matrix points have been produced whichneed to be analysed
In particular for (6,200) we have: M0 (starting optics) M1 (GA optimisation) M2 (Minuit Optimisation)
7/7/2010 CM27 - RAL 22
A small army is fighting through the dataMy apologies if I forgot some name) I am sure more want to be involved.
Good agreement DATA vs G4BeamLine (apart from the last result shown)
BUT still a lot of work- Many people involved in the analysis of these data (MA, SB, CR, MR, EC, …)-We need- to analyze DATA and produce simulations for … 1500 runs ! (surely less than that but quite a number)-TOF0-1 distance CRUCIAL for P and ph-space reconstruction- At present we could be wrong by 10-20 cm- TOF0,1 exact location?- survey in due course
7/7/2010 CM27 - RAL 23
Homework for the 6 months to come- Complete the analysis of the JUL-AUG campaign- Understand how well we can predict the beamline
M. Littlefield is modeling the entire beamline in G4MICE
Interesting project: should help us understand TOF PH-SPACEreconstruction
7/7/2010 CM27 - RAL 24
The end
7/7/2010 CM27 - RAL 2525
STEP I
- Commissioning and calibrating the beam line detectorsa)Luminosity Monitorb)TOF0, 1, 2 / CKOVa, bc)FermiLab Beam Profile Monitors- Commissioning the BL magnets- determine the (e,P) matrix- compare data to simulation-
7/7/2010 CM27 - RAL 2626
Layout
- Goals for STEP I- MICE Beam Line
- detectors- DAQ- Beam Characterization
- data taking campaign- Tracker for the next phase- Software
7/7/2010 CM27 - RAL 2727
Luminosity Monitor
- Particle Rate close to Target point- PoT as function of Target Depth (independent from BLMs)
- installed in the ISIS vault and commissioned
- coincidence to reduce spurious counts- correlation LM vs BLM