CMS Forward Muon Discussion Jay Hauser 07 Oct 2009 1/11

CSC Phase I Upgrade Electronics CSC Phase I Upgrade Electronics

• ME4/2 upgrade: 72 new large chambers• for high-luminosity triggering in 1.1-1.8

• Flash ADC board for cathode digitization• ME1/1 to handle high rates • ME1/1 to restore trigger and improve reconstruction for 2.1-2.4

• Upgrade ME1/1 associated TMB and DMB boards• ALCT mezz. upgrade NOT currently part of this plan

CMS Forward Muon Discussion Jay Hauser 07 Oct 2009 2/11

ME4/2 and ME1/1 upgradesME4/2 and ME1/1 upgradesME4/2 and ME1/1 upgradesME4/2 and ME1/1 upgrades

R-Z cross-section

“Empty” YE3 disk ready for ME4/2

CMS Forward Muon Discussion Jay Hauser 07 Oct 2009 3/11

ME4/2 upgrade motivationME4/2 upgrade motivationME4/2 upgrade motivationME4/2 upgrade motivation

• Triggering with & without the ME4/2 upgrade:• The high-luminosity Level 1 trigger threshold is reduced

from 48 18 GeV/c

Target Rate 5 kHz

Ingo Bloch, Norbert Neumeister, Rick Wilkinson

Simulation result (May ’09)(Vadim Khotilovich, Alexei Safonov)

• Efficiency gaps for good quality TF tracks disappear with addition of ME4/2

• ME4/2 will be included by default in 31X

• Back-porting to 22X took a considerable amount of effort– Thanks to the experts:

Rick Wilkinson, Tim Cox, Oana Boeriu and Slava Valuev!

CMS Forward Muon Discussion Jay Hauser 07 Oct 2009 5/11

“Digital CFEB” cathode board“Digital CFEB” cathode board

• CSC principle: digitize cathode charges to ~1%, interpolate for fine position

• Current CFEB: the ADC is multiplexed 16:1• Requires analog charge storage ASIC (SCA)

• Serial digitization after L1A

• Digital CFEB uses Flash ADCs:• Continuous and deadtimeless digitization

SCA

ADC+-ref

16 FPGA12 bits

.

.

.

.

.

.

mux

21 bitsChan-link

21:3

To DMB over Skewclear

280 Mbps6 layers

ADC

+-

ref

16 FPGA

8 pairs

.

.

.

.

.

.

6 layers

SerialOpt. Trnscvr

To DMB over Fiber~1Gbps

MGT ADC

+-

8

8

ref

8 pairs

16 pairsPipeline/FIFOs

Serial LVDS

CMS Forward Muon Discussion Jay Hauser 07 Oct 2009 6/11

ME1/1 Restoration of 2.1-2.4ME1/1 Restoration of 2.1-2.4• High- section of ME1/1

• Cathode strips are currently ganged 3:1

• Plan:• Install DCFEB boards on ME1/1• Move existing CFEBs from ME1/1 to ME4/2• Takes ~2.5 months per endcap• 72 new TMB and DMB boards needed to

accommodate additional inputs, optolinks

66 77

Channel 16

…

ElectronicsChannel 1

… …

Strips: 1 16 17 32 33 48

…

CMS Forward Muon Discussion Jay Hauser 07 Oct 2009 7/11

Overall schedule (if 2011 start)Overall schedule (if 2011 start)

CMS Forward Muon Discussion Jay Hauser 07 Oct 2009 8/11

Cost almost $9M (needs refinement)Cost almost $9M (needs refinement)

item sub-itemtotal cost

(K$)M&S labor

CSC chamber panels979 979

CSC chamber other parts Panels1227 1227

CSC fabrication 2798 2798

Electronics design 310 310

Electronics DCFEB boards 952 952

Electronics other boards cathode front-end board 1185 1185

FAST site assembly and testing FAST site assembly & testing 250 250

cables 625 625

HV system HV system 403 403

Misc. parts 36 36

Installation 50 50

shipping shipping 163 163  

Total   8977 5569 3408

CMS Forward Muon Discussion Jay Hauser 07 Oct 2009 9/11

Discussion items for today - IDiscussion items for today - I• DCFEB

• Buckeye-FADC voltage levels – is there a solution? • DCFEB optical links - what are they? What protocol

do they need on the other end (new DMBs and TMBs)? Are they synchronous (for trigger)?

• Any other news on DCFEB? • Plan is to produce the prototype in 2010 some time -

when? • Radiation test ideas?• How crazy to accelerate to 2011 installation (LHC-off

year)?

• ME1/1 DMBs: • What are the plans for prototyping?• Manpower?

CMS Forward Muon Discussion Jay Hauser 07 Oct 2009 10/11

Discussion items for today - IIDiscussion items for today - II

• ME1/1 TMBs: • How to design and build them most effectively?

• New ME1/1 TMBs: what great new FPGA features are out there that we could make use of?

• ALCT mezzanine upgrade:• left out of the Phase 1 plans so far, but…

• NB Easy replacement when ME1/1 CFEBs replaced.

• Could a cheap FPGA upgrade be found?

• Plug for asynchronous trigger at this point?

CMS Forward Muon Discussion Jay Hauser 07 Oct 2009 11/11

Discussion items for today - IIIDiscussion items for today - III

• Preparation for Phase 2: • What will replacement for TTC system mean for

peripheral crates? • We need to make sure new DMBs and TMBs for

ME1/1 are going to be fully compatible.

• Peripheral crate changes?• Do we need to change the meaning of backplane

signals to deal with "independant" inner and outer sections of ME1/1?

• Do we want TMB to send more than 2 LCTs?• What needs to be done so that MPC sends all muons

(no data funnel)?

• What else should we be discussing?

CMS Forward Muon Discussion Jay Hauser 07 Oct 2009 12/11

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