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A “BTeV” Hybrid Pixel Telescope for MTest. David Christian May 4, 2007. Outline. Review of hybrid pixel detectors, status of “BTeV” R&D. Conceptual design of pixel telescope. MTest assets. First crack at task list; items for further discussion. A Hybrid - a 2-D array of Pixels. A Pixel.

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Presentation Transcript
outline
Outline
  • Review of hybrid pixel detectors, status of “BTeV” R&D.
  • Conceptual design of pixel telescope.
  • MTest assets.
  • First crack at task list; items for further discussion.
slide3

A Hybrid - a 2-D array of Pixels

A Pixel

200 µm

“8-chip” Hybrid

400 µm

250 µm

50 µm

Sensor

What is a Hybrid Pixel Detector?

slide4

SiO2 passivation

Contact metallization

P-spray isolation

N+

N+

N+

N+

+

+

+

+

+

+

+

+

+

+

+

+

Electrons

-

-

-

-

-

-

-

-

-

-

-

-

+

N-type bulk

+

V

Holes

P

P

P

P

P

P

P

P

P

P

P

P

P

P

P

P

The Sensor

slide5

Vdda

Thresholds (Vth1-Vth7)

Token Out

Iff

ADC

Thermometer

Flash

Latch

to Binary

Vfb2

Encoder

Vfb

Resets

Row

Address

Bus

Ibp1

Ibb

Ibp2

Command Interpreter

Controller

-

+

Sensor

00 -

idle

01 -

reset

Kill

10 -

output

listen

Inject

11 -

Test

Vref

Threshold (Vth0)

4 pairs of

RFastOR

Throttle

Read Clock

HFastOR

Command Lines

Read Reset

Token In

Token Reset

Preamp

2nd stage

+disc

Kill/

inject

ADC

encoder

Digital interface

ADC

The readout IC

slide6

Debugging

Outputs

Pixel array

+ End-of-Column

Logic + e = “Core”

128x22

Pixel array

End-of-Column

Logic

Registers

and DAC’s

Data Output

Interface

Command

Interface

LVDS Drivers

and I/O pads

Internal bond

pads for Chip ID

FPIX2 developed for BTeV

Chiphit available for use in trigger

slide7

Hybrid Pixel R&D After BTeV

  • As of two years ago:
    • FNAL-designed readout chip had two minor fatal flaws.
    • No system demonstration had yet been done.
  • An “extended closeout” R&D program was approved
    • 1 more chip submission.
    • R&D refocused on ILC.
    • Two system tests approved:
      • Telescope for the forward direction of PHENIX (at RHIC)
      • Test beam telescope
slide8

Sensor & FPIX2.1 wafers

FPIX2.1 fabricated on wafer with “TripT” for D0; fatal flaws fixed; 11 wafers purchased by LANL for PHENIX, 11 by FNAL to support R&D - 2 required for MTest telescope.

Sensor wafers produced for PHENIX by CiS (LANL has agreed to donate the x4 sensors for use in MTest)

slide9

Sensors & ROCs probed – yield is high

Typical FPIX2.1 wafer map

Typical sensor IV curve

slide10

Hybridization – solder bump bonding done by VTT (Finland)

VTT bump-deposition process flow

X-ray made at FCC

slide11

15 Pre-production PHENIX (x8) hybrids delivered 12 April 2007

First 10 x4 hybrids being assembled at VTT this week.

slide12

New test beam telescope

Half-plane = three 1x4 modules

read out by 1 FPGA (collaboration with Columbia U.)

Station = two half-planes

offset by active area of sensor

2 stations upstream of DUT & 2-4 downstream (precision x & precision y)

slide14

PCB

Sensor

Readout chips

Interposer

Glue

HDI

TPG

Concept for pixel plane

mt6 a1 assets
MT6-A1 Assets
  • Climate controlled hut.
  • Aluminum table on rails allows entire setup to be removed from beam.
  • Dark box with feed throughs for signals, power, & cooling fluid.
  • Remotely controlled motors determine (x,y) position of both ends of box.
  • Local chiller provides closed loop cooling system
  • CAEN power system can provide LV & sensor bias (“HV”).
  • Plenty of quiet power is available.
slide19

Remotely Controlled x-y Positioners

Moveable Pixel Box

Feed Through Boards

Chiller

mt6 a1 task list
MT6-A1 task list
  • Status of CAEN & motor control system?
  • Modify box mechanicals
    • Support 6x4 stations
    • Stations positioned to minimize MS error at DUT
    • Flexible DUT station (CMS upgrade didn’t really work out)
pixel telescope task list
Pixel telescope task list
  • x4 HDI
  • x4 plane/station design (mechanical and electrical)
  • DAQ
  • Integration of telescope data with:
    • DUT in pixel box
    • data from other MTest detectors (if necessary)
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