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m. apollonio

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Beam-Line Analysis …

m. apollonio

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1

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, reliable
- And it looks like data are in good shape

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2

The MICE Beam-Line

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TOF (0,1,2)

TOF0 and 1 play a crucial role in this

analysis

(x0,y0)

(x1,y1)

M: transfer matrix

- Infer x0’ and x1’
- from x0,x1
- Reconstruct:
- P
- phase space
- Twiss Parameters
- emittance

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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 detectors
- Luminosity Monitor
- TOF0, 1, 2 / CKOVa, b
- 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

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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

Ref. Current

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Beam Characterization [M. Rayner]

- - Cumulative spectrum of Dt
- Comparison Feb./Aug. TOF
- Calibrations
- - Change in shape due to TOF0
- Partially “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. gauβ fit

To e- peak

E.C. Same pattern, shift of 0.5 ns due to wrong calib file used (debugging now)

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Beam Characterization [R.R.Fletcher]

- Neutral Particles responsible for an apparent Trigger inefficiency

BL+ with D2 ON

BL+ with D2=0

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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 value

See effect on beam profiles

and phase space

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Q789 (-)

G4BeamLine

DATA

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Phase Space study for some Matrix Points

MC (G4Beamline)

DATA

M0 10-240

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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=[210,220]

P=[220,230]

P=[220,230]

P=[230,240]

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 which

need 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 data
- My 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-SPACE
- reconstruction

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The end

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STEP I

- Commissioning and calibrating the beam line detectors
- Luminosity Monitor
- TOF0, 1, 2 / CKOVa, b
- 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

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