HCAL RBX PRR Overview

Transcription

1 HCAL RBX PRR Overview Jim Freeman RBX PRR March 1-2, 2001 HCAL RBX PRR: Mar 1-2,

2 HB Optics Overview RBX HCAL RBX PRR: Mar 1-2,

3 Central HCAL RBX s HO HB 15 RBX 16 RBX HE HCAL RBX PRR: Mar 1-2,

4 Optics-Megatiles Components are the machined scintillator plates, cover plates, fiber assembly (WLS spliced to clear fiber, optical connector) pigtails HCAL RBX PRR: Mar 1-2,

5 Optics-Megatiles Cross section view of a megatile HCAL RBX PRR: Mar 1-2,

6 Installing Megatile HCAL RBX PRR: Mar 1-2,

7 HB- HCAL RBX PRR: Mar 1-2,

8 HPD Hybrid PhotoDiode photon transducer for HB, HE, HO. Fiberoptic front window, conventional photocathode, pixelated diode (19 or 73 channels/device). From DEP, Holland. Need ~ 600 total. HCAL RBX PRR: Mar 1-2,

9 HPD HCAL will use the DEP hybrid photodiodes for the photodetector. There will be two types of tubes one with 73 and one with x 5.5mm 73 x 2.75mm HCAL RBX PRR: Mar 1-2,

10 HPD Photocathode Fiber-Optic Window e Ceramic feedthrough PIN Diode array p.e spectrum 4000 Gain kv 4 HCAL RBX PRR: Mar 1-2,

11 HB RBX Detail View [965.00] [313.00] LOW VOLTAGE AND PIPING AREA 19-CHANNEL RM-4 19-CHANNEL RM-3 CCM MODULE CALIBRATION MODULE 73-CHANNEL RM 19-CHANNEL RM-2 19-CHANNEL RM-1 HIGH VOLTAGE MODULE COOLING WATER IN & OUT TOP VIEW CHUNC [106.00] FRONT VIEW HB RBX COMPOSITE ASSEMBLY DRAWING R. FOLTZ, FERMI LAB J. MARCHANT, UNIV. OF NOTRE DAME AS OF 23 FEBRUARY 2001 HCAL RBX PRR: Mar 1-2,

12 RBX Readout Module The readout module (RM) integrates the HPD, front end electronics, and digital optical drivers. Electronics Cards Digital optical connector HPD unit QIEs CCAs Optical Drivers HCAL RBX PRR: Mar 1-2,

13 RBX Readout Module The readout module (RM) integrates the HPD, front end electronics, and digital optical drivers. Optical Sorter Electronics Cards Digital optical connector HPD unit QIEs CCAs Electronics cards HV Interface Card Optical HPD Mount Drivers HCAL RBX PRR: Mar 1-2,

14 HCAL QIE-based Front End SPLITTER INTEGRATOR Exponent(1:0) CapID(1:0) Global Reset Bunch Crossing Zero 40 MHz Clock ENCODER FADC Mantissa(4:0) CMS QIE Clock Reset Clock Pedestal(3:0) Test Pulse Test Pulse Clock Reset Pedestal(3:0) Channel Control ASIC Data(15:0) Control 800 Mbit/s Serializer VCSEL Exponent(1:0) CapID(1:0) Mantissa(4:0) Serial Control Bus CMS QIE CMS QIE Solution T. Shaw 5/18/00 HCAL RBX PRR: Mar 1-2,

15 Access to FE Electronics 53 degree end of HB wedge. Blue = HCAL services Green = ECAL Red = Tracker End of HB wedges obscured by cables and services from HB, EB, tracker. Servicing electronics nontrivial. HCAL RBX PRR: Mar 1-2,

16 HCAL Electronics Overview HCAL RBX PRR: Mar 1-2,

17 Calibration Source Co60, 2mC Moving Wire radioactive source calibration Carries calibration from test beam to CMS detector by taking ratio of source/(test beam), then re-measuring source at CMS. Generates about 5nA current into the electronics Laser Calibration System Exercise electronics over full dynamic range, get slopes/crossovers for QIE ranges. Set up timing of detector. Hits every channel with pulse of known timing. LED Calibration System Useful in factory, for heartbeat signal HCAL RBX PRR: Mar 1-2,

18 Light Yield and Noise Light Yield Some Numbers 10 pe / GeV MIP Signal in HO ~10 pe MIP Signal in Layer 0 ~ 5 pe HPD Gain 2000X MIP in HO is 20K e- Desire well-separated signal from pedestal noise level of ~4000 e- Radioactive Source Calibration (~5nA) uses 40Mhz path 5 na ~0.4 pe/25 ns. Radioactive source appears as pedestal shift/broadening. Measure by massive oversampling. (10 6 samples). Nr samples increases with pedestal width. HCAL RBX PRR: Mar 1-2,

19 Influence on Ped width on Calibration measurement.05 DNL Interpolated.5 Src Noise M Samples.05 DNL Interpolated.5 Src Noise M Samples Frequency E More Frequency E More Error Error HCAL RBX PRR: Mar 1-2,

20 Noise vs Input Capacitance Spice model of QIE. 50 ohm cable ~ 1pf/cm Noise = (30 * Cd) Input Noise (electrons) y = x Series1 Linear (Series1) Detector Capacitance (pf) HCAL RBX PRR: Mar 1-2,

21 HB Schedule Major HB Activity Install Scintillators in HB- (186) Install RBX HB- QIE Calibration System Study (FNAL) Move HB- to SX5 Assemble HB- (SX5) HB+ arrives 186 Install Scintillators in HB+ (186) Test Beam H2 Move HB+ to SX5 Assemble HB+ (SX5) Install RMs into RBX (SX5) Burn-in period (SX5) HB Trial Insertion into Vactank HB Complete in UX HCAL RBX PRR: Mar 1-2,

22 Design Criteria for RBX Interfaces to other subsystems Accessibility/Serviceability Environment for Electronics (volume, cooling, power, clock, noise) Safety Manufacturability Cost HCAL RBX PRR: Mar 1-2,

23 Some of the tasks waiting until after PRR Analog optical cable factory Optical cable shrouds Finalize backplane, power, clock distribution Connectors for card/backplane Card layout HV/LV cable procurement HV/LV Connectors Digital optical connectors HCAL RBX PRR: Mar 1-2,

24 RBX Situation Have a very complete design Staff organized to immediately start factory Many HCAL design issues contingent on finalizing RBX Electronics (geometry, card layout, backplane, grounding, cooling, noise, ) Optical cables (length) HV/LV cables (acquisition) Need to finalize so design group can move on to next jobs (HE, HO) Delays = $$ HCAL RBX PRR: Mar 1-2,