# Presentation: 245379

## Status

**Status**

- M. Della Negra
- LHC Symposium
- FNAL, 1 May 2003
**Civil Engineering and Magnet**
**Updates on sub-detectors status**
**Initial Detector and Early Physics**

## The CMS Detector

**MUON BARREL**

**CALORIMETERS**

** **

**ECAL**

-  Scintillating
- PbWO4 crystals

-  Cathode Strip Chambers (        )

**CSC**

- Resistive Plate Chambers (         )

**RPC**

- Drift Tube

- Chambers (     )

** ****DT**

- Resistive Plate

- Chambers (        )

**RPC**

** **

**IRON YOKE**

**TRACKER**

**MUON**
**ENDCAPS**

**HCAL**

- Plastic scintillator/brass
- sandwich

## Experimental Caverns

**Experiment: UXC55 ready July 04**

**Service : **USC55 ready Jan 04

## Services on the Magnet Yoke

- Waiting for the cavern to be ready, CMS (compact design!) can be fully assembled and tested in the large surface hall SX5.
- Wheels and disks of the Yoke can be instrumented with Muon detectors in SX5.
- Metallic structures for racks are ready. Piping work for gas and cooling has started on the yoke.

## Transfer CMS Underground mid-05

- Transfer YB0 (2000t)

- Transfer YE2 (800t each)

- Rent 2000t Gantry for ~ 4 months

- The design of CMS has been made modular to allow the transfer of big commissioned pieces underground. After the Magnet test on the surface mid-05 , CMS can be transferred in the cavern in about 4 months.

## 4 Tesla Coil Design: 4 Layer Winding

- Magnetic length			12.5 m
- Free bore diameter		6 m
- Central magnetic induction		4 T
- Nominal current			20 kA
- Stored energy			2.7 GJ
- Magnetic Radial Pressure		64 Atmospheres!

**4 Tesla Coil Design: 4 Layer Winding**

## Status of Conductor

-  All 21 superconducting cables have been produced (November 2002)

-  All 21 inserts have been
-      produced (January 2003)

-  17 (out of 21) Electron Beam (EB) welded conductors have been produced so far.

- “insert”

**Status of Conductor**

**We need 21 lengths (2.65 km each) of reinforced conductor.**
**4 lengths/coil_module x 5 coil_modules + 1 spare = 21 lengths**

- 4 lengths left to be
- reinforced. Finish by
- June 03.

**EB welding**

## Coil Winding (Ansaldo, Genova)

- Coil is made of 5 coil modules: CB-2, CB-1, CB0, CB+1, CB+2
- CB-2 completed, CB-1 ready for winding, last coil (CB+2) at CERN beg 04.
- 4 mo delay in mandrel production (critical path), aim to recover 2 mo

**Winding last layer of CB-2 **

**Magnet test on the surface ends mid-05 **
- (2 mo delay wrt V33 planning, use master contingency in underground phase)

**Mandrel Production Critical **

**CB-1**

**CB0**

## Test Coil Swiveling

- The 5 coil modules will be stacked vertically on a Swiveling Platform. The coil will then be inserted horizontally

## Inner Tracker

**5.4 m**

**Outer**** Barrel –TOB-**

**Inner Barrel –TIB-**

**End cap –TEC-**

**Pixel**

-  2,4 m

**Inner Disks –TID-**

**210 m****2**** of silicon sensors**
**6,136   Thin  detectors (1 sensor)**
**9,096   Thick detectors (2 sensors)**
**9,648,128 electronics channels**

**Notes:**
Changes Start of module production shows a delay of ~ 5 months w.r.t. v33.
Plans and milestones for 2003
Ramp-up mass-production of modules. Recover some of the delays incurred so far by exploiting high throughput of automated assembly gantries.
Submit 0.25 m version of pixel ROC chip.
Concerns Logistics of module production. 

## Module Production: Components

** **

**Automated module assembly**

**15,000 modules**

**25,000,000 Bonds**

**Schedule**: module production shows 5-6 month delay w.r.t. v33. Aim to recover as much of the delay as possible using over-capacity. If no further delays occur, 5 mo delay could be covered by 3 month tracker float + 2 months of master contingency.

**Sensors**: Production batches received from Hamamatsu (excellent quality) and ST (improvement needed)

- Problems solved: packaging of ASICs, bondability of pitch adaptors.

**Hybrids**: latest batch good, 4700 ordered, awaiting bulk order (delivery in Oct 03)

**Notes:**
The LHCC were pleased to see that production and delivery of both Hamamatsu and ST sensors with acceptable quality may soon be possible. This follows the excellent yield from Hamamatsu which is now standard, and the progress in establishing adequate QA/QC to ensure similar quality from ST. We agree that there is every likelihood that by summer 03 it will be possible to assess if the production rate of 1000 sensors per month is achieved. 

Progress on ASICS, pitch adapters, CF frames, and kapton insulators is clear, and there is every reason to be optimistic and to believe that acceptable delivery of these components with acceptable quality will soon be a matter of course. We noted that the problems with kapton-ceramic bonding on the hybrids had not been understood. Nevertheless a new delivery did not exhibit the same symptom, and therefore production of the remaining 80 for the first batch had now been authorised. 

## Tracker Module Production

**v33**

## System Tests

**TOB**

**TEC**

**TIB**

**Clean signals observed**
**in tests of all 3 subsystems**

## Pixel Detector

-  Module 00: DMILL chips with dummy sensor
-  Works well at 40 MHz
-  Successful operation of 2x8 chips

- 100

- 150

- Increase number transistors per
- pixel from 127  (old DMILL ROC)  to 251  (new DSM ROC)

- Translation of ROC chip           into 0.25 m CMOS
-  Submission end April 03
-  Superior performance

## ECAL

**Notes:**
Changes Redesign of the mechanical structure of ES
Plans and milestones for 2003
Improve the cutting process for large crystal boules
Place order for endcap crystals 
Choose the final electronics chain
Test of several hundred channels with final electronics by October 2003

Concerns Cutting process for large crystal boules 
Electronics Chain: schedule is aggressive
Assurance of funding – critical to place order for endcap crystals in 2003 

## Crystals and Photodetectors

- 85k out of 130k APDs delivered

- 4100 production VPTs delivered

- 16k barrel crystals (out of 62k ) delivered.
- Growth of large ingots is now very successful and reproducible
- Technical problems for cutting large ingots. Reduced delivery in 3 quarters
- Must order endcap crystals by end-03

- 85mm

- 4 crystals from 1 boule

## Crystal Delivery

**Crystals Delivered (cumulative)**

**Today**

**Critical Path**

**Delivery assuming quarters with reduced rate (Q1,Q2- 2003)**

**Quarters**

- 3000 in Q1-03
- 3000 in Q2-03
- 5100 in Q3-03
- 6600 in Q4-03

## Supermodule Assembly

**V33: Finish 12 bare supermodules by end-03**

**SM0**

**SM1**

**SM1**

## ECAL Electronics

**In 2002 two major concerns: **
- 1) Very Front End (VFE) analogue electronics: FPPA too noisy
- 2) Cost overrun: hope for cheap digital links (one per crystal) never materialised
**Decision:**
- 1) Organise full review of FPPA design with outside experts and resubmit. Develop back up solution in 0.25 m (DSM).
- 2)Alter electronics architecture: generate L1 trigger primitive (25 xtals) on-detector rather than off-detector- reduce links and off detector electronics by factor ~ 10.

- One new radhard 0.25m chip to be developed: FENIX  (trigger sums, digital pipeline). Build on experience with APV.
- 3) Use tracker technology for Optical links and Control system
- 4) Reorganise ECAL electronics team

## Very Front End (VFE) Electronics

**VFE Card**

**FPPAs**

**ADI ADCs**

**MGPA**

**ADC**

- Alternative: New 0.25m (DSM) ASICS, preamplifier (MPGA) & ADC submitted Feb 03, expect packaged chips in May.
-  DSM front-end expected to be substantially cheaper, consume less power and have slightly better performance
** ****DECISION in mid-2003 after comparative tests of alternative systems**
** **Prototype of VFE cards ready to test both versions

- New version of FPPA received Dec 02. Faults corrected but noise 30% higher than spec, yield 35% (instead of 50%). Very Front End analogue electronics still a concern.

**ADC and MGPA DSM Chips**

## Status of Fenix and FE Board

**FENIX** : New chip for trigger sums and digital pipeline.
- FENIX Asic Submitted Feb 03.
- Packaged chips back in May 03
**New FE Board:** (compatible for both FENIX and FPGA) ready for Tests

**FE Board**

## ECAL Planning

**Goal: Apr 07 - ECAL comple****te and commissioned**
- System test of both solutions mid-2003, followed by decision.
- ESR in Sep 03.
- EB electronics mounted in 2004/2005 – calibrate at least 9 SMs in 2004
- EE and SE mounted in 2006/2007, calibrate 1 Dee in 2006

**Electronics Schedule**

**ESR Sep 03**

**EB+ EB- EE- EE+**

## Hadronic Calorimeter: HCAL

- Had Barrel: HB
- Had Endcaps: HE
- Had Forward: HF

- HB

- HE

- HF

## HCAL : HB and HE

**Back-flange**
**18 Brackets**
**3 Layers of absorber**

**HE-1 re-installed on YE-1 in Jan/Feb 2003. **
**Only 3mm droop.**
**Mount HE+1 by end of 2003, **

**HB complete, **
**install onboard electronics by Q2-04**

## HCAL: HF Fibre Insertion

- If present rate maintained fibre insertion will be finished in November 2003
- (instead of April 04)

**scheduled**

**produced**

## Drift Tubes in Barrel

## Muons: DT Production

-  By end-Mar: 67/250 chambers made (46 at CERN)
-  All 3 sites (Aachen, Ciemat, Legnaro) assembling chambers at necessary rate
-  Torino: start assembly in autumn 03.
-  Finish outfitting of chambers in ISR. Delays in minicrates production  initial DT+RPC installation without minicrates starting in autumn 03.

**Notes:**
Finish outfitting of chambers in ISR
Delays in minicrates – initial installation w/o mc starting in auumn 03.

## Installation of first MB1 chamber 

- 4 tech. + supervisor , half a day/ch

**Installation of first MB1 chamber **

## Cathode Strip Chambers in Endcaps

## Muons: CSC Assembly

**Dubna ME1/1**
**50 out of 72 assembled **

**45 US_CSCs at CERN**

**US: production of 148 chambers finished. **

## Muons: Chambers at CERN

**CSC  Test **
**stands**

**DT  Test **
**stand**

**Alignment **
**Bench**

## Installing CSCs

- The support posts have been installed on YE+2, ready for CSCs to be mounted as soon as gas distribution pipes have been laid down. * *
- Start installation in Jun 03

## Muons: RPCs

**Endcap: **
**Funding shortfall forces staging**
- Install an initial working system **(oiled RPCs)** comprising RE1,2,3 ( < 1.6).
- -buy only components for this reduced system where practicable.-balance the books.

**Barrel**** **:
- 650 gaps completed, chamber manufacture proceeding well at Bari & GT.  20 RB ch. at CERN-ISR

**Operational RPCs**

## CMS Data Acquisition

**CMS Data Acquisition**

**DAQ TDR  submitted end-02**
**Modular design of Event Builder**** **

**8 x (12.5 kHz DAQ units)**

**The single-farm design, that provides maximum flexibility in the physics selection, works.**

## Initial Low Luminosity Detector

**LHC start up scenario?**
- First Beam in April 2007. Beam commissioning for 4 mo.
- Goal: attain > 5.1032@25ns bunch spacing.
- Shutdown 2-3 months?
- Physics Run starts mid-07: Run until 5-10 fb-1 @ 1-2 1033
**Initial CMS detector: Complete CMS (as described in TDRs) except:**
- 1. ME4 staged
- 2. 3rd forward pixel disks missing
- 3. Start with 50% DAQ (limit L1 rate  at 50kHz instead of 100 kHz)
- 4. Reduced End-Cap RPC system: RE1,2,3 (|| < 1.6).
**Staging scenario consistent with Financial Plan approved by RRB**
- The Financial Plan is based on **50 MCHF of additional funds** promised by Funding Agencies on top of their global MoU commitment of 450 MCHF.
**The cost of the initial CMS detector is ~ 500 MCHF**

## Physics at Startup

- 3 months (80 fills)
- @ L0=1033 cm-2s-1

- 10fb-1 per expt.

- 115 GeV

**Example SM Higgs Discovery Reach (5********): ATLAS +CMS**

**ATLAS +CMS**

- At L0=1033 cm-2s-1
- 1 month ~ 0.7 fb-1
- At L0= 3.1033 cm-2s-1
- 1 month ~ 2 fb-1

- Assumptions: 14hr run
- and 10hr to refill
- i.e. 1 fill/day
- tL ~ 20 hr, Efficiency of 2/3

## Physics

**Squarks and Gluino mass reach**

**SUSY will be found quickly !**

## Conclusions

**2003 is a critical year for CMS**
**Magnet:** Coil: proceeding well but on critical path: estimate delay can be reduced to ~2 months. Can compensate the delay using master contingency
**Tracker **: Tight schedule, delayed start requires full exploitation of production capacity to recover. Aim to keep any net delay within the shadow of coil delay.
**ECAL **: Tight schedule. Revised electronics still on track for ESR in Sep03. Assuming anticipated rate of crystal delivery, schedule to have complete ECAL installed in April 07 is realistic
**HCAL, Endcap Muons **: construction on schedule.
**Barrel Muons**: Delays should be recovered by Apr-04.
**To watch**
- Tracker: Ramping up of of Si modules assembly
- ECAL: Crystals production, Electronics, Endcap crystals order
- Muons: Minicrates for DTs, Installation of DTs and RPCs
**v33 CMS Schedule**: Foresees CMS closed ready for 1’st beam in April 07.** **
**A low luminosity detector can be ready for physics in 2007. Exciting physics is likely to start ‘tumbling out’ soon after startup.**