E. Hazen, Boston University BU Meeting, Apr. 6, 2001 Front-end Readout of the CMS Hadronic Forward...

E. Hazen, Boston UniversityBU Meeting, Apr. 6, 2001

Front-end Readout of the CMS Hadronic Forward Calorimeter (HF)

Conceptual Design (Summary)

by

Eric Hazen and Jim Rohlf

Boston University


Summary• 9U modules (6 readout cards each) are cost-effective,

manageable way to package the HF readout• Total of 8 crates, each with 9 readout modules

(72 modules needed)• Controller module uses the standard TIMING, SERIAL

and TEMP cards (8 needed)• WBS contains only 54 modules but cost per unit is

“reasonable” need to add 26 modules + spares• Schedule is strongly influenced by arrival of first

readout and control cards


Cost Comparison: RBX vs. VMERBX Scheme (WBS hcal_Apprvd_Dec00_rev1)

Boxes 20 $11,278 $225,556Backplanes 20 $1,131 $22,611Pwr supply 6 $3,444 $20,667

$268,833 TOTAL

VME SchemeModules 10 $1,382 $13,820Crate 1 $7,471 $7,471

$21,291 per cratefull crates 8 $21,291 $170,328 TOTAL


Production Cost Comparison: WBS vs. Conceptual Design

2.5.5.6.2modules 54 $1,382 $74,6142.5.5.8 crates 4 $11,798 $47,192

$121,806 TOTAL

Conceptual Designmodules 80 $1,382 $110,560crates 8 $7,471 $59,768

$170,328 TOTAL

* Cost based on quotes for DCC modules

*


For comparison:Production cost of DCC Motherboard

PCB $590hardware $35components $750assembly $400

$1,775 TOTAL

plus about $4600 one-time charges per design iteration


Development Schedule (WBS)ID Task Name

1 VME Modules

2 VME Module Development

3 VME Module Requirements Report

4 VME Module Design Report

5 VME Module Design

6 VME Module Design Engineering

7 VME Module Design Layout

8 VME Module Technical Support

9 VME Module Prototype

10 VME Module Prototype Acquisition

11 VME Prototype Assembly

12 VME Module Test Stand

13 Design Engineering

14 VME Module Test Stand Acquisition

15 VME Module Software Development

16 VME Module Production

17 VME Module Acquisition

18 VME Module Spares

5/9

engineer - boston - FY97



technician - Boston - FY00

VME Module Prototype (HF)/1 each[200%]

VME Module Prototype Assembly (HF)/1 each[2

engineer - boston - FY97[50%]

VME Module Test Stand (HF)/1 each

postdoc-fermilab-TBN

VME Module Production (HF)/10 each[540%]

VME Module Production (HF)/10 each[167%]

VME Module Components (HF)/1 each[5,400%]

Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr2002


Development Schedule (New)ID Task Name Duration

1 VME Modules 445 days

2 VME HF Module Development 153 days

3 VME Module Requirements Report 0 days

4 VME Module Design Report 5 days

5 VME Module Design 50 days

6 VME Module Design Engineering10 days

7 VME Module Design Layout 20 days

8 VME Module Technical Support 20 days

9 VME Module Prototype 60 days

10 VME Module Prototype Acquisition20 days

11 VME Prototype Assembly 20 days

12 VME Module Test Stand 35 days

13 Design Engineering 5 days

14 VME Module Test Stand Acquisition20 days

15 VME Module Software Development30 days

16 VME Module Production 292 days

5/9




technician - Boston - FY00

VME Module Prototype (HF)/1 each[

VME Module Prototype A

engineer - boston - FY97[50%]

VME Module Test Stand (HF)/1 ea

postdoc-fermilab-TBN

May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr2002

Note: Detailed design cannot start until FE card design is complete


Readout Options1) HB readout boxes

• Internal water cooling• Severe cabling problems for HF• Expensive (compare later)

2) HB readout cards in custom crates with FNAL backplane • Must engineer entire crate!

3) HB readout cards in 3U crates• Non-standard card spacing requires a custom

backplane to make any sense• Multiple crates per quadrant


Readout Options, cont.

4) 9U standard VME* crate with readout cards as daughterboards

This option is our preferred choice on the basis of both ease of implementation and cost

* VME Bus not used except possibly for diagnostics


2448 Channels (includes “ECAL” & “TC”) 1224 Channels per end 306 Channels per quadrant (4 crates on each end)

51 Readout cards per crate(6 QIE per card)

HF Channel Count

306

306

306

306

need 51 Readout cards per crate

306 = 9 x 34


One HF Module per PMT Box

(to scale!)

Backup OnlyBackup Only


HF Readout Module

External coax cabling from PMT input to readout card (36 total)

Multisignal microcoaxconnector


HF Crate Layout (8 total)

TTCin

CAN bus

RBX busFiber out


Each Crate has:• One controller• 9 readout modules (324 channel capacity)• “RBX bus” inter-card connection via front

panel cables• 306 input signal cables• Connector panel on or near back of crate

where larger coax is converted to micro-coax

• 18 front panel 9-fiber optical connectors for output


Crate Location


HF Readout Module Block Diagram


HF Readout Module (summary):• 36 input cables

(possibly an Axon multi-microcoax connector)• External coax cabling to each of 6 readout cards• Internal “RBX bus” at center of card, so that digital

operations occupy adjacent real estate• “RBX bus” cable input on front panel• Two 9-fiber optical connectors on the front panel for

output to the HTR• Power and system reset via 3U VME backplane (J1)


HF Controller Motherboard


Controller Motherboard:• Three controller daughter cards,

Timing, Serial and Temperature

• One TTC front-panel fiber connector (input)

• Nine cat-5 front-panel connectors to distribute “RBX bus” to readout modules

(4-pin + 5-pin or 10-pin)

• One 9-pin D-type front-panel CAN bus connector

E. Hazen, Boston University BU Meeting, Apr. 6, 2001 Front-end Readout of the CMS Hadronic Forward...

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