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R&D status of CCD based vertex detector for JLC

R&D status of CCD based vertex detector for JLC. Tsukasa Aso Toyama National College of Maritime Technology G.Iwai, K.Fujiwara, H.Takayama, N.Tamura Niigata University Y.Sugimoto, A.Miyamoto KEK K.Abe Tohoku Gakuin Univ. JLC-VTX Group. Contents. Objective CCD Structures

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R&D status of CCD based vertex detector for JLC

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  1. R&D status of CCD based vertex detector for JLC Tsukasa Aso Toyama National College of Maritime Technology G.Iwai, K.Fujiwara, H.Takayama, N.Tamura Niigata University Y.Sugimoto, A.Miyamoto KEK K.Abe Tohoku Gakuin Univ. JLC-VTXGroup Presented on LCWS2002, Aug.26-31 Jeju Island KOREA

  2. Contents • Objective • CCD Structures • Charge Carrier Multiplier CCD • Fast R/O System • Extension of Detector Simulator • Radiation Damage Tests (Proposal) • Summary Presented on LCWS2002, Aug.26-31 Jeju Island KOREA

  3. Objective • Charge Coupled Device(CCD) • 2-dimensional reconstruction • Small pixel size – Large Chip size • Usually operated at very low temperature, -180C • Our Study • CCD operation at near room temperature • Light Cooling system - Easy operation • Thermal distortion of wafers • Remove materials - minimize the effect of MCS • Issues!! (Achieve sufficient S/N ) • Deterioration due to the Radiation damage • How to minimize the effect of radiation damageand keep clean signals Presented on LCWS2002, Aug.26-31 Jeju Island KOREA

  4. Approach • Study items • Various type of CCD structures • Specification versus S/N, CTI, etc. • Noise proportional to dark charge => MPP Operation suppressed dark charge. • CTI reduces the signal charge => Clock pattern, Notch. • Fast readout systems • Reduction of dark charge with short R/O time • CTI improvements with shorter dwell time • Study of radiation damage • Background estimation on simulations • Experimental tests Presented on LCWS2002, Aug.26-31 Jeju Island KOREA

  5. CCD Structure (MPP Operation] HPK S5466 2-phase 3um-wide notch HPK S5466 2-phase EEV 02-06 3-phase Presented on LCWS2002, Aug.26-31 Jeju Island KOREA

  6. CCD Structure (cont’d] CTI properties S/N > 10 @278K CTI CTI is propotional to N_t/n_s, Where N_t : Defect concentration N_s: Signal concentration 3Phase 2Phase Std Intrinsic Resolution Is better than 3 um. Notch VCTI ( Irradiation) Presented on LCWS2002, Aug.26-31 Jeju Island KOREA

  7. CCD Structure [cont’d] Radiation Hardness Electrons from Sr90 Neutrons from Cf252 Dark current (electrons/pix) Limit > 1.5E+11e/cm2 JLC: 1.5E+11/cm2/yr @2.4cm Vee (V) Vee (V) Limit > 1.5E+10 n/cm2 JLC: 1E+9/cm2/Yr (?)(Back scattering from QC1) Presented on LCWS2002, Aug.26-31 Jeju Island KOREA

  8. CCM CCD (1) • CCM (Charge carrier multiplier) • Multiply generated charge using Impact ionization • Multiplying generated charge directly in the charge domain before conversion into a voltage • High-field region between the two neighboring gates • Gained energy is dissipated through Impact Ionization (II) • Small variance in the II Impact Ionization Integrated charge High-Field Multiplication Presented on LCWS2002, Aug.26-31 Jeju Island KOREA

  9. CCM CCD(2) • Advantage • Since It is difficult to reduce the noise floor of existing charge detection amplifiers particularly at high clocking frequency,It it beneficial to multiply signal charge before its conversion into a voltage. • Since the radiation damage makes signal charge smaller by increasing of CTI, S/N become worse. We expect that CCM may keep signal larger enough after irradiation Amp. Gain both of signal and floor noise are multiplied. CCM before charge detection amp. Only the signal is multiplied. Floor noise Floor noise Presented on LCWS2002, Aug.26-31 Jeju Island KOREA

  10. CCM CCD(3) –IMPACTRON- 690 • IMPACTRON • Texas Instruments • TC253SPD • 658(H)x496(V)A pix. In Image Sensing Area • 7.4um Square Pixels • Charge multiplication gain 1~30(TYP)~100 • Charge conversion gain w/o CCM 10uV/e 496 4 500 CCM (400pix) Presented on LCWS2002, Aug.26-31 Jeju Island KOREA Charge Multiplication!!!

  11. CCM CCD (4) –IMPACTRON- (Preliminary) We have just started to test TC253SPD. Pedestal R/O 250kpix/s T = 4 sec. Very very preliminary -12dB CMG 7V. 0 C The study of IMPACTRON is now going on ……. Please wait for next conference. (Vertex2002)? Presented on LCWS2002, Aug.26-31 Jeju Island KOREA

  12. FastR/OSystem(1) Control/Operation of FADC Memory for data accumulation CCD FADC Digital Board • Our goal of this development Near detectors S to P Driver Feature Portable Fast operation (Goal 40MHz) Easy operation Low cost Timing Card (FPGA] FADC P to S Base-Clock Generator CPCI (6U) Other TCs Programming to FPGA, clock pattern. Presented on LCWS2002, Aug.26-31 Jeju Island KOREA

  13. Fast R/O System(２) • Evaluation board of Flush ADC • CCD Signal processor chip for Digital Camera 9x9mm2 chip size ~ $6/chip • AD9844A(Analog Devices Co.) • 12bit 20MSPS ADC • 20MSPS Correlated Double Sampler • 6bit variable CDS Gain Amp. • Low power consumption(65mW/2.7V) • AD6644ST(Analog Devices Co.) • 14bit 65MSPS ADC • High power consumption Presented on LCWS2002, Aug.26-31 Jeju Island KOREA

  14. Fast R/O System(3) AD9844A[FADC] • Current Status(Evaluation board) XC2V404CS144C(FPGA) AD6644[FADC] LVDS Input Backside Interface to Digital board (12 bit DBUS] CCD SIGNAL VIDEO SIGNAL AD6644 input Presented on LCWS2002, Aug.26-31 Jeju Island KOREA

  15. Fast R/O System(4) Evaluation board CPCI (9U) • IMPACTRON Data Acquisition using AD9844A evaluation board. Timing Generator Tektronix DG2030 5MHz FADC AD9544A FPGA XC2V404C5144C Digital Board TTL to LVDS 40MHz CCD Digital board Signal (5MHz) Base clock Preset Scaler CCD Driver analog board R/O start Presented on LCWS2002, Aug.26-31 Jeju Island KOREA

  16. Digital board Evaluation board for FADC Presented on LCWS2002, Aug.26-31 Jeju Island KOREA

  17. Fast R/O System(5) DATACLK CCD SIGNAL SHP 5MSps SHD CCD SIGNAL 1 H Lines At present, the main contribution of noise is the interference of input operation clocks. This will be recovered to use PLL/DLL scheme in FPGA Presented on LCWS2002, Aug.26-31 Jeju Island KOREA

  18. Extension of Detector simulator(1) • Developing a new detector simulator, Jupiter, based on Geant4. • Extension for background estimation • Background situation depends on the accelerator design • Accelerator design is often modified in design stage • Accelerator design also have to pay attention to the background situation of the detector • Needs feedback each other Detector simulator with precise Accelerator components Presented on LCWS2002, Aug.26-31 Jeju Island KOREA

  19. Extension of detector simulator(2) • Requirements • Magnet materials and fields • Position of magnet • Easy to replace configuration of • accelerator components • magnetic fields • Better to simulate beam transportation and connected to the beam delivery system Presented on LCWS2002, Aug.26-31 Jeju Island KOREA

  20. Extension of detector simulator(3) Talk will be presented on session J. • Detector Model d) • L* = 4.3m • 3T (Solenoid) • Crossing +-3mrad QC2 CDC IP QC1 QC1 VTX SD0 VTX Presented on LCWS2002, Aug.26-31 Jeju Island KOREA

  21. Radiation test proposal(1) • Why is additional test of radiation damage needed? Radiation damage is thought to be proportional to NIEL The radiation damage at JLC estimated to be 10 times bigger than our study using Sr90. Radiation damage by high energy (>10MeV) electrons should be studied. Non-Ionizing Energy Loss Presented on LCWS2002, Aug.26-31 Jeju Island KOREA

  22. Radiation test proposal(2) Tohoku-Univ • Experimental setup • Choice of Settings • Primary Beam Energy 125/60 MeV • Target radiation length 0.1/0.5 X0 • B field High/Low Tesla mode Electron Beam 125 MeV 60 MeV Bending Magnet Pt 0.1X0 0.5X0 Presented on LCWS2002, Aug.26-31 Jeju Island KOREA

  23. Radiation test proposal(3) CCD5 125MeV High Tesla Pt 0.5 X0 60MeV Low Tesla Pt 0.1 X0 CCD4 • Estimation on the simulation CCD3 CCD2 CCD1 CCD0 0 5 10 15 20 25 MeV/c 0 20 40 60 80 MeV/c Momentum range of electron irradiation will cover about 8 MeV/c < p < 80 MeV/c Presented on LCWS2002, Aug.26-31 Jeju Island KOREA

  24. Presented on LCWS2002, Aug.26-31 Jeju Island KOREA

  25. Summary • The current status of our studies for JLC CCD Vertex detector are presented. • The studies are concentrated on the radiation damage which is related to the background situation in JLC. These issues are studied by the both of experiment and simulations. • As well as the investigation of CCD properties, newly developed R/O system is designed and fabricated as a evaluation board. Presented on LCWS2002, Aug.26-31 Jeju Island KOREA

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