The Scintillator-ECAL 2 nd Prototype S. Uozumi (Kobe) Jun

The Scintillator-ECAL Beam Test Establish the Scintillator-strip ECAL technology – Test linearity of the ScECAL with high energy beam. – Evaluate all the necessary performances using various beams ( ,K,e,  ….) with wider energy range Combined test with the Analog HCAL Test  0 -> 2  reconstruction (simulation study just started by Y. Sudo) Measure hadron shower to test simulation model The 2 nd prototype will be 4 times larger than the DESY BT module. ( 18 x 18 cm, 30 layers) Fully adopt the extruded scintillators. 72 strip x 30 layers = 2160 channels in total.

The Scintillator-ECAL 2 nd Prototype System ScECAL Base- boards CMB Flat cables clear fibers LEDs Light shielding Stage Electronics shelf power Signal to CRCs power CANbus control

AHCAL Beam Detector will be located in front of AHCAL on beamline. Put readout electronics box here? We would like to put a steel plate on ECAL stage.

What is the maximum size of the stage we can put in ECAL space? If we can install a stage large enough to put ScECAL, LED system and readout box, we can make the cable length shorter and can reduce complexity of cabling a lot. Current baseline idea is to put readout box ~1m far from the detector. Stage (~100x60cm) ScECAL (~30x30cm) LED-fiber light distributor (20 x 40 cm) Readout Box (~60x30cm) Beam

ScECAL Layer Tungsten plate Extruded strips 1 x 4.5 x 0.3 cm MPPC WLS fiber

ScECAL Layer (cont’d) 18-line FPC cables ( 9 MPPCs soldered) Acrylic light distributors (for MPPC gain monitoring) FPC connectors Connector board Clear fibers (for MPPC Gain monitoring) 36-line FPC cable To Base- board 18 x 4 = 72 channels / layer 18 cm

Baseboards and shelf 20 (up to 25 including spare) baseboards are used to read out 2160 channels. An connector board will be attached to change connector arrangement from ch to 36x3ch. The baseboards will accommodate in an electronics shelf. 2 CMBs will also accommodate in the shelf. Size of readout shelf is ~60 x 30 cm, height 70~80 cm.

Detector and readout box are Connected by flat cables.

LED Gain Monitoring System LED Acrylic plate (27.0cm long) Distribute LED light to all the strips to monitor gain of each MPPC. CMB board by Prague AHCAL will be used as LED driver. Acrylic bar will be used for light distributor. Currently light yield is not enough at far side of the bar, some more effort and modification of design ongoing. LED Clear fiber

LED Gain Monitoring System Actual BT frame Pulses from CMB One optical fiber and acrylic bar for 9 strips 240 fibers in total 20 fibers are attached for one LED. 12 LEDs in total. (+ spare)

LED Calibration Runs Purpose of the LED run – MPPC gain monitoring and electronics inter-calibration. Gain monitoring run – Can we get trigger for LED run? – CANbus operation Not yet successful despite of great effort by Daniel and help from Ivo. Necessary control will be LED pulse height, width and timing. CAN control will be done by PC which will be brought from Japan? – Pulse-height scan necessary to get appropriate pulse height for gain monitoring. Electronics gain Inter-calibration – Will be done by LED system. – For a backup solution, muon data can be used for it.

Power, cable, etc Baseboard – Power supply and cables supply will be kindly provided by AHCAL group. – Cabling between baseboards and CRC – depends on position of the electronics box. CMB – We will install 2 CMBs for gain monitoring. – Plan to bring a power supply from Japan. – LVDS signal necessary for VCALIB & TCALIB system. Plan to prepare in Japan. – Or better to synchronize whole procedure with AHCAL system?

DAQ, online-monitor, analysis, slow control DAQ system … we Have to rely on AHCAL system. Need help from experts to have the system for ScECAL. Online monitor … better to have consistent system with SiW-ECAL / AHCAL. Also need expert’s help… Almost same system which George kindly provided at DESY BT will be enough. Data Analysis – For LCIO conversion, database entities, we expect the same this with DESY BT. – For quick data quality check during the beam test, we will use a simple root ntuple. For this purpose analysis machine and disk will be brought from Japan. – For offline analysis after the beam test, we will move whole analysis to CALICE reconstruction software and prepare analysis modules. Slow Control – We need to adjust HVs for each MPPCs. – Data files will be prepared after finishing MPPC mass-measurement.

Trigger / Veto counter Is the trigger counter in current setup usable also for our DAQ? How many, size, thickness, position? Is there any work necessary before our beam time? Veto counter put in front of the detector might be useful to reject multi-particle events. Is it possible to bring from Japan and install ?

Tentative Run Plan Periodical calibration with muon at highest intensity beam momentum. Energy scan with e- (e+),  -(  +) beam – 6, 10, 12, 15, 20, 30, 40, 60 GeV, try even higher energy if possible. – Necessary number of events will be determined according to beam purity and spot size. – Main detector region will be “uniform region”, but also interesting to scan in “non-uniform region”. – Angle scan ? Maybe not easy …  0 run – Put material on upstream, generate pi0 with reaction of  + + n -> p +  0 – Try to reconstruct  0 invariant mass with various energy by finding 2 . – Need simulation study (underway). Periodical LED run for gain monitoring / inter-calibration.

Requirements for stage movements Movement to horizontal and vertical direction – Entire ScECAL surface have to be scanned for MIP calibration and position scan with e-/  - beams. – 20cm movement (+-10cm from center) required. Rotation – Not in our first run plan, since beam time is limited. – Also re-alignment may take some time. – But interesting option to try +10deg rotation if time permits.

Assemble & Test in Japan (Shinshu) Beam FNAL FebMarAprMayJunJulAug Beam Test Simulation study Detector frame and tungsten assembly, Readout cable Extruded scintillator production & test MPPC mass measurement Shipping Build/implement gain monitoring system Prepare analysis Sep Schedule toward the FNAL BT

Current estimate of the BT schedule Equipments will arrive to FNAL around Aug-18. First team will arrive to FNAL at Aug-17 (or even earlier to collect info). Registration and training on Aug-18~19. Start working at beamline as soon as finishing the training. – Detector construction and install, alighment, cabling – Install readout electronics – Install and test gain monitoring system – DAQ / Trigger / Tracking system – Online monitoring Commissioning with beam will start on Sep-1 st, will run for 3-7 days. Then move to physics run. Finish DAQ on Sep-26 th, withdraw during weekend (27, 28 th ). Response curve measurement considered after the beam time finishes. Ship equipments back to Japan on 29 th, leave FNAL on 30 th.

Participants Satoru (Kobe postdoc, full-period) Kotera (Shinshu postdoc, full-period) Daniel (Kobe postdoc, ~1week) Tohru (Shinshu professor, some part during setup) Kiyotomo (Kobe professor, some part during setup) Adil (KNU PhD student, full) DongHee (KNU professor, some part during setup) Daejung (KNU postdoc, sometime in Sep) Nishiyama (Shinshu student, full) Sakuma (Shinshu student, full) Sudo (Tsukuba student, full) Ikuno (Tsukuba student, full) Takahashi (Tsukuba student, until Sep-6) Ikeda (Kobe student, full)

Some more things Schedule of radiation training Possibility of 4 th beam period early in next year. Availability of experts during Aug / Sep.

Backups

CALICE FNAL BT schedule Setup started since April 2008 Beam period 1 : May 7~27 – overlap with CERN data – exploration of the 1-10 GeV/c region – calibration samples Beam period 2 : July 7~29 – main low energy collection period – filling in the gaps (+ calibration) – Satoru will visit FNAL and join in this period to contribute and collect information. Beam Period 3 : most likely Sep 1 st – 26 th – setup will start at mid. Aug.) – Replace SiW ECAL to Scintillator-ECAL. Beam Period 4 : as an option. Early in next year ?

Jobs ongoing toward FNAL BT Collect information (Takeshita, Kawagoe, Uozumi) – Available space, beam types and momentum, beam time, beamline devices, temperature control, budget Beam test simulation (K. Ueyama, D. Jeans, Y. Sudo) Design detector Tungsten & scintillator assembly (Shinshu) Support structure (Shinshu) Electronics shelf, Flat cable, MPPC soldering (Kotera, Uozumi) Extruded scintillator production (KNU) - Test in KNU – Need mass-measurement of the scintillator strips in Japan. Measure hole position and size, look at non-uniformity with beta-ray source (Kobe) MPPC mass measurement (Shinshu) Gain monitoring system (Ikeda with Daniel, Uozumi) – Efforts still ongoing to establish the system.

MPPC Saturation effect At the DESY BT (1-6 GeV), we saw just small effect of the MPPC saturation. At the FNAL beam test (up to ~30 GeV), effect will be much larger. Precise collection will be one of the most important issue this time. After saturation correction Before DESY BT results MPPC response curve With 3 different strips

Study of MPPC Saturation effect Study to understand the MPPC response is underway in Tsukuba Univ. by T. Ikuno and Y. Takahashi. – Piece-by-piece variation of the response curve. – Effect of cross-talk and after-pulse to the response curve. – Monte Carlo simulation of MPPC response. Measured response curves of 20 samples (T. Ikuno) Piece-by-piece variation seems to be small (<2%) MPPC response simulation (Y. Sudo) Red … Simulation Black … measurement

Readout cable Since longer cable (~1.5m) is necessary, there is a problems on cost. Now preparing alternative idea. Idea 1: Idea 2:

Simulation Shower leak is checked with G4 simulation. Need to implement the ScECAL to Mokka simulation. – Mokka is simulation framework commonly used in CALICE. – This work is necessary to have common simulation framework with other prototypes (AHCAL, SiW-ECAL,…) – Mokka work ongoing by Y. Sudo in good shape. Shower leakage with electron beam With G4 simulation (K. Ueyama) Energy resolution with Mokka simulation (Y. Sudo)