m. apollonio

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Beam-Line Analysis …

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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

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The MICE Beam-Line

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(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)

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OnLine Phase Space Reconstruction

Beam Line Online Tuning

Tried also an OL optimisation(very slow)

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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

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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

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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

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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

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Beam Characterization [R.R.Fletcher]

- Neutral Particles responsible for an apparent Trigger inefficiency

BL+ with D2=0

BL+ with D2 ON

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Beam Characterization [A.Dobbs]

- Adam had a chance at 10 V … and he did not miss it!- soon in a MICE-note

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Quadrupole Scan(s) [S. Blot]

Q789 (- / +) and Q456 (+)

I(triplet) = 050% to 175% of the nominal valueSee effect on beam profilesand phase space

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Q789 (-)G4BeamLine

DATA

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MC (G4Beamline)

DATA M0 10-240

Phase Space study for some Matrix Points

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MC (G4Beamline)

DATA M1 10-240

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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

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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)

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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

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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

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The end

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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-

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Layout

- Goals for STEP I- MICE Beam Line

- detectors- DAQ- Beam Characterization

- data taking campaign- Tracker for the next phase- Software

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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