Tracking Summary A. Bross MICE Collaboration Meeting RAL October 2004 Outline SciFi Prototype results KEK Test Beam Beam line and Beam line instrumentation VLPC system DAQ and electronics Simulation Full.
Download ReportTranscript Tracking Summary A. Bross MICE Collaboration Meeting RAL October 2004 Outline SciFi Prototype results KEK Test Beam Beam line and Beam line instrumentation VLPC system DAQ and electronics Simulation Full.
Tracking Summary A. Bross MICE Collaboration Meeting RAL October 2004 Outline SciFi Prototype results KEK Test Beam Beam line and Beam line instrumentation VLPC system DAQ and electronics Simulation Full Simulation in MICE (Step VI) Mechanical Design Assembly and Quality Assurance MICE DAQ System TPG R&D Status Scintillating Fiber Tracker Tracking in MICE M. Ellis, C. Rogers A great deal of progress has been made since Osaka in the understanding of the SciFi tracking Performance As you heard yesterday The nine questions have been answered The baseline tracker performs well in MICE Cost and Schedule are acceptable sPz, Simulation using equilibrium e [You see I did not use the words cost, schedule, MICE, and acceptable in the same sentence.] No outstanding technical issues But the devil is in the details Some Details Fiber Tracker - Step 1 M. Yoshida Prototype performance (Light yield) 3HF concentration in station B •X view 5000ppm •W view 3500ppm •V view 2500ppm 3HF concentration (ppm) Most probable light yield (p.e.) 2500 10.49 ± 0.15 3500 10.32 ± 0.12 5000 8.89 ± 0.06 Prototype performance (II) Efficiency Measured e > 99% 3HF Concentration (ppm) Measured Efficiency (%) Expected Efficiency (%) 2500 99.73 ± 0.16 (stat.) 99.72 (10PE) 3500 99.29 ± 0.25 (stat.) 99.72 (10PE) 5000 98.09 ± 0.39 (stat.) 98.62 - 99.38 (8-9PE) Position resolution 442 ± 4 (stat) ± 27 (syst) mm Expected : 424 – 465 mm Dead channel Definition; fewer hits above 4 p.e. 2 channels / 1008 = 0.2% D0 fiber tracker case : 0.25% だんかい 2 – KEK Test K. Yoshimura [Not to be confused with Step II @RAL] Beam S-JACEE Magnet B = 1T One Week lifetime per fill Test Tracker Geometry This is the layout that is proposed for the testbeam. The spacing is – 10cm, 15cm and 20cm. 3 Stations from Prototype + 1 new station VLPC System Cryo-Cooler based Design complete Fabrication well advanced November delivery Cryo-cooler delivered Sumitomo 451D @Fermilab Two cassettes on loan from D0 Ship to KEK in February Lid Assembly Drawing Thermal Calculations Stage 1 (~ 60 K) Stage 2 (~ 7 K) Cassette 7.7 watts 0.82 watts Envelope 15.0 watts 0.45 watts Miscellaneous 2 watts 0.10 watts Total per slot 25 watts 1.4 watts Total for cryocooler 50 watts 2.8 watts Operating Point 65 % capacity at 1st stage 55% capacity at 2nd stage KEK Test - Objectives Perfomance check to finalize design Light yield, Efficiency, Noise Pattern Recognition Momentum measurement Calibration (alignment) Mesurement Emittance prove to determine by 0.1% accuracy KEK Test: だんかい 2 – Phase I Basic performance check Confirmation of cosmic-ray run with new VLPC cryostat light yield – comparison of fiber concentration – VLPC vs PMT – Minimum ionizing - Defocus beam position resolution (Alignment error) – Minimum ionizing - Defocus beam – Inclined beam (detector be tilted) multiple scattering - material thickness – momentum/angle dependence – various momentum High intensity beam だんかい 2 – Phase II Precision Measurement w/ magnetic field Track finding/Pattern recognition relatively low p beam (0.3 ~ 0.6 GeV/c) Inclined beam Generate Pt using degrader/diffuser Momentum resolution Evaluated with 4 identical station External Momentum measurement – TOF hodoscope? (+PID?) • Lpath = 12 m, σt (TOF) = 50ps • dp/p = 1%? • Better if PID is available Position calibration during DAQ w/B field Good quality Low p beam? Possible TOF Detector 2.5” Finemesh PMT could be borrowed from BESS Group? 20 PMT’s for TOF, 16 PMT’s for Aerogel 5x5 hodoscope だんかい 2.PII２ K. Yonehara G4Beamline: Beam simulation G4Mice: Tracker and Detector KEK DAQ: System Overview Linux PC AFE II (L) PCI-VME 1553 SASeq #1 U VME BUS 6 SASeq #2 CAMAC-VME AFE II Control VLPC backplane Slow Control VLPC Cassette #1 AFE II (R) 8x64 ch AFE II (L) 8x64 ch LVDS-VME #２ 1024 ch 8x64 ch VLPC Cryostat Serialized ADC DATA LVDS-VME #３ LVDS-VME #４ 4x8bit = 32 bit / board 1024 ch VLPC Cassette #2 AFE II (R) LVDS-VME #1 8x64 ch CAMAC crate AFE II Status First board under test!! First AFE II Prototype Basic electrical tests Everything looks good so far except for a few components that were installed improperly Functional tests begun Downloads –OK On-board processor –OK Coming Alive! First Problem discovered Will require “green” wire fix 3 boards have been loaded 18 additional boards in the queue Waiting for first results before giving the stuffing house the go-ahead to stuff the remaining boards This Leads To Step II.5 Mechanical Design: Version 2.5 This is the version that is being considered if there is initially only one solenoid. It will consist of two trackers as shown, back to back with an absorber in between set inside one solenoid. G. Barber Alignment/Stability To develop a stable system we plan to carry out a series of assembly tests. To allow us to determine the position of each station we will be fitting 3 ruby spheres to each station, these can then be measured on our CMM. This will allow us to not only check the stability of the structure but will also allow us to know the positional repeatability we can expect from the locating system. Minimum Pitch These two views show adjacent stations with a pitch of 100mm. It is difficult to assess the bend radius required on the fibres from this model therefore we will need to make a model using the carbon fibre stations and simulating an appropriate thickness where the fibre planes pass over the radius of the station. What the model shows is that it will be very tight SciFi Mechanical - Summary We are now ready to build the 4th station and this will allow one more round of ‘fine tuning’. The design of the final layout be it 2.5 or final needs to start now and this will involve not only the tracker but all of its neighbours. It will be necessary to run a series of tests on the final structure to assess its stability Busy times ahead SciFi QA P. Hobson Overall system concept Precision illumination to excite only the bundle of 7 fibres OR System to illuminate two bundles of 7 either side of the desired “dark” bundle Fits better with the symmetry of the problem May be easier to arrange Step through all the groups of 7 to aid in assembly of fibres into ferrules. Can use the same system afterwards to check that there are no significant breaks in the fibres. Use a video camera to aid in the original alignment of the illuminator with respect to a datum on the plane. Simulations – convergent beam Virtual source True 3D simulation (non-sequential). Includes ray splitting, polarisation, scatter and absorption effects. Horizontal lines through fibres on this view are “detector” planes to measure the energy passing through the mid-planes of the fibres. Cuboid volume represents the interplane glue. Glows in the dark Many fibres illuminated at once. Red background is from the laboratory “safe” light Using a simple mask one fibre can be strongly excited (plus a few others very weakly, here seen in blue) Thoughts on MICE DAQ E. Gschwendtner Assumptions & Requirements Maximum beam rate will be 1 particle per bunch, which means ~ 3000muons /1ms particle-by-particle readout: not enough time! → All digitisers: buffered during spill Only ¼ of the incoming particles will fall into the acceptance Upstream spectrometer measures out-of-acceptance and out-of-RF phase particles, in addition to RF phase and in-acceptance One calibration (RF off) cycle will be taken per normal (RF on) cycle Standalone mode for set-up, test and calibration Data volumes… VME crates Data Volume Data Volume/crate SciFi TPG TOF e/µ-ID 2 1front+1rear 1 rear <2MB/s 12MB/s <0.5MB/s negligible <0.5MB/s -<0.25MB/s - Storing a few to 10 TB for 1 week data taking… DAQ DAQ must record ~3MByte/s → Runs very reliable with standard items E. Radicioni TPG Progress The TPG is certainly a potential backup solution and is probably near to become an upgrade solution. It remains an important R&D activity of MICE and it must be brought to full completion.* * A Referee’s (GG) report TPG Fundamentals The TPG is a cylindrical TPC equipped with GEM amplification and a special high-resolution pad-plane TPCs with GEMs are actively studied by several groups around the world in view of the linear collider experiments. The novelty of the TPG consists in the pad-plane, where projective readout promises high granularity with a reduced number of channels Dedicated design choices for MICE were the dimensions (100cm length, 30cm diameter) to fit into the tracker magnet The gas (He) chosen because of its low conversion probability The hexaboard ~710000 hexagonal pads size: 300 mm pitch: 500 mm grouped into strips along 3 coordinates at 120 degrees (u, v, w) running at different depths 300 mm 500 mm The dream team at work Hexaboard QC U,V vs. W correlations TPG out-of-line events are due to lack of gain calibration Correlation is important: it can be exploited as an additional tool for getting rid of fake combinations COMPASS In addition to the use of the 3rd projection Compass is able to reject (almost all) fakes by this technique TPG Tracks 2 MeV/c electron in B=0.07T Transverse diffusion spreads the charge Intrinsic resolution U+V vs. W resolution s~40µm 55Fe X-ray conversion position can be determined by 2 projections, then cross-checked with the 3rd one. The intrinsic resolution is VERY promising This has been obtained with a 3cm drift cell. Actual resolution over longer drift depends on gas properties. Gas choice Shorter field-cage? He/CO2 1m Ne/CO2 18cm E 500 V 300 V Max HV 50 KV 5.4 KV Drift time 60 ms 6 ms Drift velocity 1.68 cm/mm 3 cm/mm Sampling freq 2MHz 10MHz Number of samples 118 60 Trans/long diffusion 1000/1600 mm 80/200 mm Specific ionization 10 e-/cm 20 e-/cm Usable long. Slices 118 20 (shaper limited) N. Radiation lenghts 6.6 E-4 5 E-4 X-ray abs. Coeff. 2.5 E-5 cm-1 1.2 E-4 cm-1 X-ray abs. probability 1 0.4 Electronics HARP ALICE TPG Conclusions The TPG detector is operational in the HARP testbed Placed an order for 2000 channels of the new electronics First results indicate performances at the expected level or better Several design parameters can be reviewed Better gas choice better resolution Shorter detector less material, straightforward construction, compact, could stay in shorter solenoid. Faster drift time less X-ray background Better resolution More results from beam tests in the near future Tracking Sessions Conclusion, Outlook The SciFi Tracker has been shown to be a cabable of providing all stated requirements for MICE Modulo answering the questions mentioned earlier Much expertise with the SciFi tracker has already been developed with the prototype test at Fermilab The KEK beam test will bring us a long way towards developing all the requirements for Step II+ at RAL Final Detector specifications Fiber/Mechanics/Cryo Tracker assembly and QA Electronics/DAQ Tracking Algorithims Work has starting on understanding the full DAQ for MICE R&D on the TPG option has made excellent progress in the last year