VELO Module PRR preparation meeting 28-feb-2006 Liverpool Massimiliano Ferro-Luzzi 1

Introduction

VELO overview Overall planning A bit of (recent) history A look ahead

VELO Module PRR preparation meeting 28-feb-2006 Liverpool Massimiliano Ferro-Luzzi 2

VELO overview

~1 m

module support

CO2 cooling

detector "hood"

kapton cables

Vacuum vessel repeater electronicsLHC collision point8

« RF box »

Home-made rectangular bellows

VELO exit window

Silicon modules

Wake field suppressor

VELO Module PRR preparation meeting 28-feb-2006 Liverpool Massimiliano Ferro-Luzzi 3

VELO installation and commissioning: strategy

two parallel activities

Install detectors after bake-out (& sector test)

Global LHCb commissioning(starts nov 2006!)

Install vacuum/mechanics at IP8Vacuum continuity for LHC, bake out

Commission vacuum and positioning systems

"POINT8"

now

Assemble/commission detectors and electronics outside IP8

Test beam run, rec. s/w, alignment..."Alignment Challenge & Detector Commissioning"

"ACDC"

now

jan 2007

VELO Module PRR preparation meeting 28-feb-2006 Liverpool Massimiliano Ferro-Luzzi 4

VELO installation and commissioning: schedule excerpt

v6.0

v6.0

install detector halves in vessel: january 2007

ACDC-1 ACDC-2a ACDC-2bVELO detector commissioning "ACDC"

all modules for detector half must be avai-lable 3 months before going to a test beam run

all modules for detector half must be avai-lable 3 months before going to a test beam run

test beam test beam 25ns

Considerable resources from other LHCb groups (such as Online and Infra-structure) is being diverted to ACDC support

Considerable resources from other LHCb groups (such as Online and Infra-structure) is being diverted to ACDC support

VELO Module PRR preparation meeting 28-feb-2006 Liverpool Massimiliano Ferro-Luzzi 5

From EDR to PRR (1)

Module EDR report:

Answers from the VELO group:

in red boxes, text by the referees in blue boxes, text by VELO group

VELO Module PRR preparation meeting 28-feb-2006 Liverpool Massimiliano Ferro-Luzzi 6

From EDR to PRR (2)

...

EDR referees' statements

VELO Module PRR preparation meeting 28-feb-2006 Liverpool Massimiliano Ferro-Luzzi 7

From EDR to PRR (3)

since then, another 3 (to 4 ?) months slipping

VELO group's answer

EDR referees' statement

VELO Module PRR preparation meeting 28-feb-2006 Liverpool Massimiliano Ferro-Luzzi 8

PRR prerequisites

VELO group's answer

EDR referees' statements

VELO Module PRR preparation meeting 28-feb-2006 Liverpool Massimiliano Ferro-Luzzi 9

Most recent history

~dec'05 - jan'06

Because of further slipping of PRR target date, it was decided to

allow parallelizing the development of the module assembly

procedure:

– produce 4 mechanical modules up to specs (geometry)

– produce 3 electrical (two-sided) hybrids up to specs (eletrically)

– start PRR with these achievements and finish the review process with

full electrical module tests within a couple of weeks after the PRR

(follow-up meeting with referees).

This does not free us from making 3-5 full modules and having them

fully qualified (in vacuum, under bias, cooled) before starting

production.

involves some

components

wastage

VELO Module PRR preparation meeting 28-feb-2006 Liverpool Massimiliano Ferro-Luzzi 10

Recent LHCC comprehensive review

Slides at http://indico.cern.ch/conferenceDisplay.py?confId=741

From LHCb Spokesperson's email summary:

“Concerns are expressed for the silicon detectors, i.e. IT, TT and VELO;

being late significantly. Since their module production is not reaching to the

state of real serial production yet, they find it difficult to assess whether the

claimed milestones can indeed be reached. […] They have noted the very

tight schedules for the production of VELO RF-box and Kapton cables […]. ”

VELO Module PRR preparation meeting 28-feb-2006 Liverpool Massimiliano Ferro-Luzzi 11

Review goals of this review

Given that prerequisites for PRR are not met,

Aim at

– reviewing inventory of steps that are yet to be taken for achieving the

PRR prerequisites

– review estimates of time required for each step

– review resources allocated for these steps

– review inventory of components (with QA flags)

– agree on a plan toward PRR finalization and a framework for

continuous monitoring until PRR finalization paralell processing: discover all (yet unraveled) issues!

e.g.: finalize a complete module (even if not up to specs) and operate it in

vacuum system, with cooling and power + bias.

– in particular, agree on a list of measurements/graphs that ought to be

produced for demonstrating that PRR prerequisites are achieved

VELO Module PRR preparation meeting 28-feb-2006 Liverpool Massimiliano Ferro-Luzzi 12

Look ahead

Finalize PRR process by March 31

Achieve full production speed by week 17 (2 modules / week)– week of 24 to 28 of April

May 15: more than 5 modules mounted on Right detector half