RBX PRR - March 1-2, 2001 1

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HCAL RBX PRRHCAL RBX PRRHCAL RBX PRRHCAL RBX PRR

Readout Box (RBX)

PRR

Dan Green

HCAL Project Manager

RBX PRR - March 1-2, 2001 2

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OutlineOutlineOutlineOutline

• Schedule and Milestones

• R&D experience

• RBX components• shell

• backplanes

• ODU

• HPD

• Calib - laser, LED, sources

• Services - HV, LV, cooling,

• Controls

RBX PRR - March 1-2, 2001 3

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HCAL OrganizationHCAL OrganizationHCAL OrganizationHCAL Organization

RBX PRR - March 1-2, 2001 4

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HCAL - ML, HBHCAL - ML, HBHCAL - ML, HBHCAL - ML, HB

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HCAL Critical Path and RBXHCAL Critical Path and RBXHCAL Critical Path and RBXHCAL Critical Path and RBX

RBX PRR - March 1-2, 2001 6

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Central HCALCentral HCALCentral HCALCentral HCAL

HE

HB 15

16RBX

RBX

RBX PRR - March 1-2, 2001 7

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HB RBX Detail ViewHB RBX Detail ViewHB RBX Detail ViewHB RBX Detail View

The issue for the RBX is the access to the HPD. There are integration issues with the tracker patch panel. A mockup was made and changes appear possible which will ease the problem. Schedule is such that the RBX is near to the critical path.

RBX PRR - March 1-2, 2001 8

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HE RBX Conceptual DesignHE RBX Conceptual DesignHE RBX Conceptual DesignHE RBX Conceptual Design

HE can go ahead with the RBX, it appears, as the overlap of services and cables with other subsystems is not as severe as it is with HB.

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ODU - Optics for Layer-->TowerODU - Optics for Layer-->TowerODU - Optics for Layer-->TowerODU - Optics for Layer-->Tower

RBX PRR - March 1-2, 2001 10

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HPDHPDHPDHPD

19 x 5.5mm 73 x 2.75mm

The HPD have had many problems which have been solved - sequentially. At present we specify an Al electrode and an anti-reflection coating. This “works” but the problem of low yields at the vendor must be solved.

RBX PRR - March 1-2, 2001 11

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H1 and H2 LayersH1 and H2 LayersH1 and H2 LayersH1 and H2 Layers

RBX PRR - March 1-2, 2001 12

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Pulse Formation - BiasPulse Formation - BiasPulse Formation - BiasPulse Formation - Bias

300 micron R9814032

-3

-2

-1

0

1

2

3

4

5

6

7

20 30 40 50 60 70 80 90 100

time[ns]

pu

lse

he

igh

t[m

V]

Vb=180

Vb=150

Vb=100

200 micron S9849328

-3

-2

-1

0

1

2

3

4

5

6

7

0 10 20 30 40 50 60 70 80

time[ns]p

uls

e h

eig

ht[

mV

]

Vb=200

Vb=150

Vb=120

Vb=100

Vb=75

Vb=50

We have developed at fast diode which - with guard rings - can be run at very high bias.

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Near Term HPD R&DNear Term HPD R&DNear Term HPD R&DNear Term HPD R&D

RBX PRR - March 1-2, 2001 14

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HCAL QIE-based Front EndHCAL QIE-based Front EndHCAL QIE-based Front EndHCAL QIE-based Front End

ChannelControl

ASIC

Exponent(1:0)

CapID(1:0)

Mantissa(4:0)

800 Mbit/sSerializer

VCSEL

CMS QIE

Exponent(1:0)

CapID(1:0)

Mantissa(4:0)

Clock

Reset

Pedestal(3:0)

Test Pulse

Test Pulse

Clock

Reset

Pedestal(3:0)

Data(15:0)

Clock

Control

Serial Control Bus

Global Reset

Bunch Crossing Zero

40 MHz ClockSPLITTER

INTEGRATOR

ENCODER

FADC

CMS QIE

CMS QIE Solution

T. Shaw5/18/00

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QIE ScheduleQIE ScheduleQIE ScheduleQIE Schedule

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Decoder Box, Test Beam R&DDecoder Box, Test Beam R&DDecoder Box, Test Beam R&DDecoder Box, Test Beam R&D

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Access to FE ElectronicsAccess to FE ElectronicsAccess to FE ElectronicsAccess to FE Electronics

End of HB wedges obscured by cables and services from HB, EB, tracker. Servicing electronics nontrivial.

53 degree end of HB wedge.

Blue = HCAL services

Green = ECAL

Red = Tracker

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GoalsGoalsGoalsGoals

• We have a ~ final design which has been on hold for 6 months.

• The schedule for RBX is near to the critical path.

• The design has been sent to CMS for evaluation and optimization.

• We need approval of the RBX - optical cables, ODU, shell, etc. The HPD and QIE are not yet ready for prime time.