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MICE Beamline Commissioning Linda R. Coney NFMCC Meeting 16 January 2010
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Linda R. Coney – 16 Jan 2010 Outline Overview of MICE beam line 2009 Run Goals Target u Operation u Stability Detector Commissioning , e, p, and beams Beam optics optimization and measurements u Upstream Quadrupoles u Decay Solenoid u Muon beam emittance measurements Conclusions 2
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Linda R. Coney – 16 Jan 2010 MICE Beam Line TOF2 attached to front of KL and installed end of November 3
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Linda R. Coney – 16 Jan 2010 Goals for Running in 2009 Begin MICE Step I Commission new target Commission detectors u GVA1, CKOVa, CKOVb, TOF0, TOF1, FNAL Beam Profile Monitors, KL High intensity running for study of ISIS activation Commission Decay Solenoid Calibrate TOF system Calibrate CKOV and KL Perform Beam Studies: u Beam loss vs. Particle Rate u Optimize Upstream Beamline (Q1, Q2, Q3) u Decay Solenoid optimization Optimize DAQ for increased particle rate Measure muon beam emittance 4
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Linda R. Coney – 16 Jan 2010 Outline Overview of MICE beam line 2009 Run Goals Target u Operation u Stability Detector Commissioning , e, p, and beams Beam optics optimization and measurements u Upstream Quadrupoles u Decay Solenoid u Muon beam emittance measurements Conclusions 5
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Linda R. Coney – 16 Jan 2010 Target Operations 50,000 pulses of redesigned target in test stand in R78 New target installed in ISIS August 2009 u Run at base rate (50 Hz/32) and with ISIS at 50 Hz (Normal User Run) u Inspected after 12k, 22k, 42k, 63k – PASSED Target is working beautifully – NO problems Target stability checked every 5000 pulses u Process to monitor target behavior agreed upon with ISIS Target timing wrt ISIS MS signal monitored Coordinating Beam Loss measured by MICE with that measured by ISIS Target Operation: 112,000 pulses to date u Machine Physics – 8 days of MICE running u September User Run – 10 days u Nov/Dec User Run – 12 days 6 MICE target path ISIS cycles MS marker ISIS losses
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Linda R. Coney – 16 Jan 2010 Target Monitoring Target stability checked every 5000 pulses u Study Beam Center Distance (BCD) to monitor target stability Clear difference between BCD distribution for functioning target and failing target u Failing target has much broader spread u T2 distribution 3-4 times as broad u Interpreted as target “sticking” Target BCD very stable 7
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Linda R. Coney – 16 Jan 2010 Target Data Taking Target Operation Studies: u Search for ideal timing with respect to ISIS cycle s Also a function of target depth u ISIS Beam loss vs particle rate study s Increase target depth, producing ISIS beam loss of 0.1, 0.2, 0.3, 0.4, 0.5, 1, 2, 3 and 4 V s In 2008, maximum ISIS beam loss 50 mV Found edge of beam at injection need to avoid next pulse on out-swing u Studies of different accelerations: modified drive voltages on capacitor bank ISIS machine study: beam bump at MICE target 8 Normal BLMs around ISIS with MICE target inactive (Sector 7) Target operating at 2V beamloss
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Linda R. Coney – 16 Jan 2010 Target Operations Beamloss (in Sector 7) for the 13 hour run at 1V Two distinct peaks (although only fitted a single Gaussian) Double structure due to ISIS beam wandering in cyclic pattern Not due to variation in target depth! Survey of target area after long 1V run Slight activation (max. 500 Sieverts/hour) in couple of spots near target No impact on measurements around the rest of ISIS ISIS suggests repeat at 5V beamloss 9 Activation Study Beam Loss Variation
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Linda R. Coney – 16 Jan 2010 ISIS Beam Bump Study BEAM BUMP TEST (last 2ms of cycle): D. Adams & M. Popovic 1ms-long kick generated to change nominal orbit New orbit kept stable for another 1ms All brought back to the nominal trajectory The test was performed as follows: 0- use nominal trajectory setting (ISIS) 1- set target BCD for 50 mV losses 2- align target dip minimum with the extraction edge 3- record dip depth and delay 4- extract target 5- introduce the bumped orbit 6- insert target until produce 50mV loss again 7- record dip depth and delay Results depth of ~5mm reproduced the 50mV loss (predicted value was 7mm) ISIS beam closer to target reduces depth needed to generate a defined beamloss faster insertion, better control of next pulse clipping u Bumped orbit well controlled locally u Rest of orbit very stable 10
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Linda R. Coney – 16 Jan 2010 Beam Loss vs Particle Rate Study Beamline set for 300 MeV/c - beam Losses calculated using fit to curve of BLM7SUM peak Error bars (tiny) just from rms/sqrt(#counts) Counts in GVA1 11 A. Dobbs
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Linda R. Coney – 16 Jan 2010 Beam Loss vs Particle Rate Study II Beamline set for 300 MeV/c - beam Losses calculated using fit to curve of BLM7SUM loss peak Error bars (tiny) just from rms/sqrt(#counts) Counts in FNAL BPM1 12 A. Dobbs
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Linda R. Coney – 16 Jan 2010 Next: Beam Loss vs Particle Rate Repeat analysis using integrated beam loss rather than fit to peak method u ISIS determines MICE losses using integration over full cycle Rate vs beam loss plots as function of particle type u Uses TOF for PID and rate counter u Cannot use BPMs for this as beam content may change between them u Can use current data for this study Repeat study with positive particles Repeat study with muon beamline Take more data points at higher beam loss 13
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Linda R. Coney – 16 Jan 2010 Outline Overview of MICE beam line 2009 Run Goals Target u Operation u Stability Detector Commissioning , e, p, and beams Beam optics optimization and measurements u Upstream Quadrupoles u Decay Solenoid u Muon beam emittance measurements Conclusions 14
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Linda R. Coney – 16 Jan 2010 MICE Beamline and Detectors 15
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Linda R. Coney – 16 Jan 2010 Time of Flight Counters TOF0, TOF1 installed for September & Nov/Dec User Runs TOF2 installed in late November Horizontal and vertical bars Have proven to be invaluable in beamline commissioning Tof-0 0.48 m 10 x 4cm scintillator bars x = 1.15 cm t = 50 ps Tof-1 0.48 m 7 x 6cm scintillator bars x = 1.73 cm t = 50 ps 16
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Linda R. Coney – 16 Jan 2010 Data Taking Program: Positive Particles Detector Calibration: u 300 MeV/c pions - 4000 target pulses (translates to about 330,000 particles used for calibrating the TOF system) u 250 MeV/c pions - 350 target pulses (also for TOF) u 200 MeV/c pions - 450 pulses (also for TOF) u 300 MeV/c positrons - 1500 target pulses (CKOV and KL calorimeter) u 150 MeV/c positrons - 1200 target pulses (CKOV and KL calorimeter) Beam Studies: u 330 MeV/c pions to study Decay Solenoid effects on beam optics - 2000 pulses Muon Beams: u 444 MeV/c pi+ to mu+ beam - 500 pulses 17
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Linda R. Coney – 16 Jan 2010 333 MeV/c pion beam Sept 10 with 500mV losses 18
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Linda R. Coney – 16 Jan 2010 333 MeV/c proton beam Sept 06 19
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Linda R. Coney – 16 Jan 2010 444 MeV/c pi+ to mu+ beam Motivation to switch beam polarity 20
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Linda R. Coney – 16 Jan 2010 444 MeV/c pi- to mu- beam After switched to negative beam 21
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Linda R. Coney – 16 Jan 2010 Data Taking Program: Negative Particles In October – switched beamline polarity Detector Calibration : 300 MeV/c - 2800 target pulses (TOF system) u 300 MeV/c electrons - 5750 target pulses (TOF, CKOV and KL calorimeter) u 150 MeV/c electrons - 1200 target pulses (TOF, CKOV and KL calorimeter) Beamline Studies : 300 MeV/c for particle rate vs beam loss study – 400 pulses 300 MeV/c for spill gate vs particle rate study – 500 pulses 330 MeV/c for particle rate vs beam loss study – 2400 pulses s 50mV, 100mV, 200mV, 300mV, 400 mV, 500 mV losses Optimization of Upstream Beamline - 330 MeV/c Q1,Q2,Q3 scans – 1100 pulses Muon Beams – Emittance Measurements 444 MeV/c to 250 MeV/c beam - 1500 337 MeV/c to 250 MeV/c beam – 1550 444, 420, 400, 360, 337 MeV/c to 250 MeV/c beam – 500 pulses 22
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Linda R. Coney – 16 Jan 2010 Data Taking Program with TOF2 End of November – TOF1 moved, TOF2 installed Detector Calibration with TOF1 trigger: 300 MeV/c : 6500 target pulses (calibrating TOF system & target delay study) 250 MeV/c : -500 target pulses (TOF system) u 300 MeV/c electrons - 3000 target pulses (TOF,CKOV and KL) Muon Beams - Emittance measurement data 444 MeV/c to 250 MeV/c beam - 9100 pulses 337 MeV/c to 250 MeV/c beam – 1000 pulses 444 MeV/c to 200 MeV/c beam – 1000 pulses 444 MeV/c to 300 MeV/c beam – 1000 pulses 400 MeV/c to 225 MeV/c beam – 2000 pulses 337 MeV/c to 200 MeV/c beam – 2600 pulses 23
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Linda R. Coney – 16 Jan 2010 TOF Calibration Many TOF bars to calibrate Need lots of data! Last year’s data……..This year… TOF system with TOF2 in progress 2009 300 MeV/c increased statistics 2009 330 MeV/c 2008 (Peaks overlap) e 24
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Linda R. Coney – 16 Jan 2010 TOF Calibration: Time Resolution Different calibration done for September and Nov/Dec Runs Discrimination threshold changed and improved time resolution September: TOF0 – 52 ps, TOF1 – 68 ps Nov/Dec: TOF0 – 51 ps, TOF1 – 58 ps TOF1 completely calibrated, TOF0 all but slab0 and slab9 in both planes 25
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Linda R. Coney – 16 Jan 2010 Cherenkovs Two aerogel Cherenkov counters Installed downstream of Q6 and TOF0 Used to separate e/ / 220-350 MeV/c e/ / calibration data taken Sample electron data shown 26
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Linda R. Coney – 16 Jan 2010 e/ Identifier KL lead/scintillating fiber calorimeter module u Installed on temporary support with TOF1 in September u Moved downstream and mounted with TOF2 in November u Calibration in progress u Electron data taken u FADCs all working u DAQ restructured & ok Electron Muon Ranger (EMR) u Triangular prismatic scintillator bars u Being constructed at UGeneva u Installation later this year 27
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Linda R. Coney – 16 Jan 2010 Outline Overview of MICE beam line 2009 Run Goals Target u Operation u Stability Detector Commissioning , e, p, and beams Beam optics optimization and measurements u Upstream Quadrupoles u Decay Solenoid u Muon beam emittance measurements Conclusions 28
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Linda R. Coney – 16 Jan 2010 Upstream Beamline 29
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Linda R. Coney – 16 Jan 2010 Optimization of Upstream Beamline: Q1,Q2,Q3 scan Q1-2-3 varied from nominal value Charged particles counted downstream of Decay Solenoid Compared to MC u Charged -, -, e- Use MC to predict effect for single current changes verify in the next run 14 nominal config. data MC 30
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Linda R. Coney – 16 Jan 2010 f1-only (MC) DATA Q1 scan Good agreement between data and MC for variation of only Q1 Optimization of Upstream Beamline: Q1,Q2,Q3 scan 0.6 0.8 1.0 1.2 1.4 1.6 1.8 1.4 1.2 1.0 0.8 0.6 0.4 0.2 31
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Linda R. Coney – 16 Jan 2010 f2-only (MC) DATA Q2 scan Agreement between data and MC not as good as that for Q1 Optimization of Upstream Beamline: Q1,Q2,Q3 scan 32 0.6 0.8 1.0 1.2 1.4 1.6 1.8 1.4 1.2 1.0 0.8 0.6 0.4 0.2 32
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Linda R. Coney – 16 Jan 2010 Optimization of Upstream Beamline: Q1,Q2,Q3 scan Q3 scan Data not agree with MC Q3 could be more sensitive to small misalignment f3-only (MC) DATA 33 0.6 0.8 1.0 1.2 1.4 1.6 1.8 1.4 1.2 1.0 0.8 0.6 0.4 0.2 33
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Linda R. Coney – 16 Jan 2010 Decay Solenoid Optimization 330 MeV/c pion beam DS nominal setting 550 A (3.1T) Vary +/- 10% and study profile in TOF0 Check data vs MC (our understanding of BL) Run 1121 DS lower 0.30T Run 1123 Nominal DS Run 1125 DS up 0.30T TOF0 TOF1 34 Study still in progress
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Linda R. Coney – 16 Jan 2010 Muon Beam Studies at MICE! The MICE experiment takes 17000 target pulses of muon beam data! ~170,000 at TOF1 Muon beam studies begin! Worldwide celebrations ensue! Locals in Britain express strong support for the experiment Blimey!Muons! 35 Extra!
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Linda R. Coney – 16 Jan 2010 Muon Beam Data Preliminary muon rate survey 337 MeV/c - to 250 MeV/c - beam Varied target depth to study muon rate as function of beam loss VERY preliminary! Muon Beams - Emittance measurement data 444 MeV/c to 250 MeV/c beam - 10,600 pulses 337 MeV/c to 250 MeV/c beam – 2500 pulses 444 MeV/c to 200 MeV/c beam – 1000 pulses 444 MeV/c to 300 MeV/c beam – 1000 pulses 400 MeV/c to 225 MeV/c beam – 2000 pulses 337 MeV/c to 200 MeV/c beam – 2600 pulses 36
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Linda R. Coney – 16 Jan 2010 Muon Beam Emittance Measurements Purpose: generate the elements of the “emittance-momentum matrix” u Study performance at every portion of a full cooling channel Can we use the TOFs to demonstrate the matrix elements? Q1Q2Q3Q4Q5Q6Q7Q8Q9 DK sol D2D1 TOF1TOF0 Target Diffuser Cooling channel and spectrometers 3610 140 200 240Initial 4D N (mm) Absorber P z (MeV/c) Data MICE note 176 Apollonio, Cobb M. Rayner 37
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Q4 Q1 Dipole1 DK solenoid Q2Q3 Dipole2 Q5Q6Q7Q8Q9 dnstream BL tuning: match to diffuser P =208 MeV/c P =444 MeV/c P =214 MeV/c fix D1 fix D2 P =255 MeV/c Marco Apollonio - Imperial College 38
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Linda R. Coney – 16 Jan 2010 Measuring ( ,P) from DATA - Rationale - check if an optics produces the foreseen ( ) at diffuser - measure (and P) of the muon beam - measure beam spread (sig x ) and divergence (sig x ’ = sig(p x /p z )) - How? - use TOF0 / 1 as (x,y) stations - define muon sample - track mu’s in the Q7-8-9 triplet - infer x’, y’ (x,x’) (y,y’) - scatter plots give phase spaces Mark Rayner’s tools 39
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Linda R. Coney – 16 Jan 2010 Muon Beam Measurement Use PID on December’s scaled decay beam line data Define muon sample “Central” beamline optics 444 MeV/c 250 MeV/c at D2 6-200 Runs 1380-1397 and 1391-1393 Intermediate momentum beam line with scaled quad currents Runs 1407-1408 444 MeV/c 225 MeV/c at D2 6-140 (rescaled currents) Runs 1409-1411 337 MeV/c 200 MeV/c at D2 M. Rayner 40
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Linda R. Coney – 16 Jan 2010 Reconstruction procedure Iterative calculation of increasingly good s= z+ and P Begin with P from P/E= z/t s 1 Calculate a linear transfer map at P from TOF0 to TOF1 (top hat quadrupoles) s 2 Deduce x 0 ’ and y 0 ’ from x 1 and y 1 s 3 Integrate ds while tracking the initial trace space vector through the beam line s 4 Make a better estimate of P from P/E=s/t s 5 Make a small Bethe-Bloch correction for the energy loss in air between the TOFs M. Rayner41 Marco’s=6mm pabsorber=200 MeV/c centre of the -p matrix beam
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Linda R. Coney – 16 Jan 2010 Muon Beam Measurement : x and y trace space Truth Recon’d det. sim. Data M. Rayner 42
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Linda R. Coney – 16 Jan 2010 Goals for Running in 2009 Revisited Begin MICE Step I Commission new target Commission detectors u GVA1, CKOVa, CKOVb, TOF0, TOF1, FNAL Beam Profile Monitors, KL High intensity running for study of ISIS activation Commission Decay Solenoid Perform Studies: u Decay Solenoid optimization - in progress u Beam loss vs. Particle Rate - in progress u Optimize Upstream Beamline (Q1, Q2, Q3) Calibrate TOF system Calibrate CKOV and KL ongoing Optimize DAQ for increased particle rate ongoing Measure muon beam emittance – started – ongoing 43
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Linda R. Coney – 16 Jan 2010 Conclusions Beamline is working! – negative or positive particles u New target operating smoothly - Systematic monitoring of performance u Decay Solenoid routinely operated – factor 5 increase muon rate Major increase in loss limits 50 mV (2008) 1V (2009) DAQ increase in efficiency: <50 particles/spill (2008) ≤ 200 part/spill (2009) u Beam loss vs particle rate shows linear dependence Detectors are working! u TOF0, TOF1 calibrated – TOF2 next u Need more data for TOF2, KL u EMR installation – Summer2010 Muon beam optics physics is happening! u Upstream beamline is tuned u Initial measurement of muon beam emittance u Muon Rate Study – in progress More ( ,P) matrix data in February/March 44
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Linda R. Coney – 16 Jan 2010
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Target Operations Beamloss (in Sector 7) for the 13 hour run at 1V Two distinct peaks (although only fitted a single Gaussian) Double structure due to ISIS beam wandering in cyclic pattern Not due to variation in target depth! Survey of target area after long 1V run Slight activation (max. 500 Sieverts/hour) in couple of spots near target ISIS suggests repeat at 5V beamloss 9 Activation Study Beam Loss Variation
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Linda R. Coney – 16 Jan 2010 Target Operations II Target I stability from 16 Sept 2009 u Characteristic double peak due to inherent 0.15 mm position resolution and the pulse by pulse capture position deltaD for 5 th =.13 and for 16 th =.12 Running at same depth – consistent behavior 6
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Linda R. Coney – 16 Jan 2010 Decay Solenoid Operation of Decay Solenoid is now routine Provides gain of ~5 in particle flux Without DSWith DS 34
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Linda R. Coney – 16 Jan 2010 Decay Solenoid Operation of Decay Solenoid is now routine Provides gain of ~5 in particle flux Without DSWith DS 35
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Linda R. Coney – 16 Jan 2010 Beam Stop Open! Remote operation of Beam Stop
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Linda R. Coney – 16 Jan 2010 TOF Calibration Time of Flight spectra for several beam optics and species 26
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