cms hl-lhc em calorimeter upgrade
DESCRIPTION
CMS HL-LHC EM Calorimeter Upgrade. M. Hansen, CERN for the CMS ECAL upgrade project(s). Content. Legacy system design and Status Requirements Barrel Calorimeter electronics upgrade End Cap calorimeter upgrade Conclusion. Legacy ECAL Barrel FE electronics system - Design and Status. - PowerPoint PPT PresentationTRANSCRIPT
CMS HL-LHCEM Calorimeter Upgrade
M. Hansen, CERNfor the CMS ECAL upgrade project(s)
M. Hansen, CERN. [email protected]
Content
Legacy system design and Status Requirements Barrel Calorimeter electronics upgrade End Cap calorimeter upgrade Conclusion
CMS HL-LHC EM Calorimeter Upgrade @ ACES2014
M. Hansen, CERN. [email protected]
Legacy ECAL Barrel FE electronics system- Design and Status
Modularity 25 channels = 1 trigger tower
Features Trigger Primitive generation Pipeline, event buffer in FE
Status 25/2592 with issues 13/2592 irrecoverable
CMS HL-LHC EM Calorimeter Upgrade @ ACES2014
STRIPASIC
HSSer.STRIPASIC
STRIPASIC
STRIPASIC
STRIPASIC
HSSer
TCPASIC
DAQASIC
FENIX
FENIX
FENIX
FENIX
FENIX
FENIX
FENIX
GOL
GOL
800Mbps
800Mbps
Trigger etc.ADC
QuadADC (5x)
PreAmp
3 gain MGPA (5x)PD1
APD1; G=50
PD2APD2; G=50
PWO crystal4p.e. / MeV to APD pair
VFE card (5x)
FE card
Low voltage regulator board – 10 linear rad tol regulators
Dynamic range 40MeV – 1.5TeV, 40ns RC-CR
ASICS in 0.25um tech
LegacyECAL Barrel trigger tower
CMS HL-LHC EM Calorimeter Upgrade @ ACES2014 M. Hansen, CERN. [email protected]
GOH (GOL hybrid)
CCU (Slow control)Front end chip
QPLL (clock cleaning)
Low voltage regulatorsVFE
FE
Mother board
LegacyECAL Supermodule integration &
Slow control 72 legacy towers in SuperModule
36 SM in total Slow and fast control in 8 rings
Single tower of fibre failure recovery; very few issues to date
CMS HL-LHC EM Calorimeter Upgrade @ ACES2014 M. Hansen, CERN. [email protected]
Noise vs ageing Electronic noise vs ageing and
eta APD dark current predicted to
increase with integrated luminosity – confirmed ->
Large Extrapolation suggest noise increase by a factor 10 after 3000fb-1 Roughly corresponds to 400
MeV/channel TBC by measurements
The feasibility to operate the ECAL barrel colder and thereby decrease the APD dark current noise is under study
CMS HL-LHC EM Calorimeter Upgrade @ ACES2014 M. Hansen, CERN. [email protected]
CMS ECAL Barrel Anomalous events:Spikes
APD
Crystal
HCAL
(2)
Hadrons interacting with the APD’s causing anomalous high E deposits
Hadrons come from primary interaction and backsplash
CMS HL-LHC EM Calorimeter Upgrade @ ACES2014 M. Hansen, CERN. [email protected]
LegacyReal Time Spike rejection Algorithm
An EM shower deposit E in more than one crystal A spike typically occurs only in one APD
CMS HL-LHC EM Calorimeter Upgrade @ ACES2014 M. Hansen, CERN. [email protected]
eta strip number: 1 2 3 4 5
OR result: 1 (shower-like)
OR result: 0 (spike-like)
EM shower Spikecrystal above threshold
crystal below threshold
eta strip number: 1 2 3 4 5
0 1 0 0 01 1 1 0 00 1 0 0 00 0 0 0 00 0 0 0 0
0 1 0 0 0
channels above threshold
strip LUT result:
0 0 0 0 00 1 0 0 00 0 0 0 00 0 0 0 00 0 0 0 0
0 0 0 0 0
channels above threshold
strip LUT result:
strip LUT configuration: 00000,00001,00010,00100,01000,10000 → output=0 all other combinations → output=1
TCP ASIC → OR of 5 strip LUT results
ϕ ϕ
CMS HL-LHC EM Calorimeter Upgrade @ ACES2014 M. Hansen, CERN. [email protected]
Spike rates L1 Spike rejection in 2012
O(95%) Rate sustainable up to LS3
with somewhat raised channel threshold
Legacy Spike Rejection Algorithm is sensitive to PU (see plot ->)
Exploring improvements having access to full granularity of data in the trigger path Single crystal readout
Exploring pulse-shape variables to provide an additional efficiency/rejection safety margin Analogue Signal ProcessingCMS HL-LHC EM Calorimeter Upgrade @ ACES2014 M. Hansen, CERN. [email protected]
M. Hansen, CERN. [email protected]
ECAL barrel Phase 2 UpgradeRequirements
Requirements Trigger rate up to 1 MHz
Legacy max ~150 kHz Trigger latency up to 25 us
Legacy max ~5 us Full installation during LHC Long Shutdown 3 Maintained or improved reliability and availability Improve the EB spike mitigation
High on the wish list Decrease the Low Voltage Current delivered to the Front End
system in order to decrease the physical volume required for services
Solid failure mitigation scheme E.g. avoid dependence between neighbours
CMS HL-LHC EM Calorimeter Upgrade @ ACES2014
M. Hansen, CERN. [email protected]
Phase 2 ECAL Barrel FE electronics system- Design idea
Modularity 1 channel for readout and trigger As legacy for services (bias, LV)
Features Trigger-less Streaming
Requires 10 Gbps GBT 4 fibers/readout unit
CMS HL-LHC EM Calorimeter Upgrade @ ACES2014
HSSer
HSSer
HSSer
GBT
GBT
GBT
ADC?PreAmp?PD1
APD
PD2APDPbW crystal
VFE card
FE card
PreAmp/ADC?
QIE?
9.6Gbps
4.8/9.6Gbps
9,6Gbps
4.8Gbps
Controls
Data stream + control handshake
Data stream
Data stream
LV regulator board, e.g 3 rad tol DCDC
M. Hansen, CERN. [email protected]
Phase 2 ECAL Barrel FE electronics system- Design idea
Modularity 1 channel for readout and trigger As legacy for services (bias, LV)
Features Trigger-less Streaming
Requires 5 Gbps GBT 6 fibers/readout unit
CMS HL-LHC EM Calorimeter Upgrade @ ACES2014
HSSer
HSSer
HSSer
HSSer
HSSer
GBT
GBT
GBT
GBT
GBT
4.8Gbps
ADC?PreAmp?PD1
APD
PD2APDPbW crystal
VFE card
FE card
PreAmp/ADC?
QIE?
4.8Gbps
4.8Gbps
4.8Gbps
4.8Gbps
4.8Gbps
Controls
Data stream + control handshake
Data stream
Data stream
Data stream
Data stream
LV regulator board, e.g 5 rad tol DCDC
M. Hansen, CERN. [email protected]
Current EB R&D plan for TPVFE
Develop a VFE chip set and Carrier Develop the optimal scheme for spike detection
At the source, i.e. in the very front end amplifier and ADC In the back end exploiting fine granularity of channel level data
Define the best compromise between noise and power consumption
Considering the increased APD noise due to radiation damage Considering the possibility to operate the ECAL barrel below room temperature
Optimise sensitivity to out-of-time Pile-Up Optimise sampling rate and pulse shaping time for HL-LHC conditions
CMS HL-LHC EM Calorimeter Upgrade @ ACES2014
M. Hansen, CERN. [email protected]
Current EB R&D plan for TP Develop the upgraded front end power system demonstrator
Develop a carrier for e.g. the DCDC module described last Tuesday afternoon by Federico Faccio
Evaluate with legacy front end system Look out for issues with Noise and Thermal management
Develop a front end card Demonstrator Streaming data to the back end Look out for issues with Thermal management
Study existing CMS back end cards and define requirements for the future ECAL back end system E.g. cards developed for the CMS level 1 trigger phase 1
upgrade
CMS HL-LHC EM Calorimeter Upgrade @ ACES2014
M. Hansen, CERN. [email protected]
CMS EB upgrade Working Groups WG1: Evaluate Scope of Upgrade with regard to Risk and
Schedule W. Funk, M. Hansen, et al.
WG2: Develop motivation and Evaluate options for upgrading the VFE and the LVR M. Dejardin et al.
WG3: Evaluate the desired Functionality and characteristics of replacement FE card A. Singovsky, J.C. Silva, et al.
WG4: Detector Monitoring D. Bailleux, P. Gras, et al.
Group of electronics developers is growing
CMS HL-LHC EM Calorimeter Upgrade @ ACES2014
ENDCAPS SECTION
CMS HL-LHC EM Calorimeter Upgrade @ ACES2014 M. Hansen, CERN. [email protected]
CMS Endcap calorimeter upgrade
ECAL and HCAL Endcaps are suffering radiation damage
Planning re-build or fully replace ECAL and HCAL Endcaps for HL-LHC
Three proposals on the table
CMS HL-LHC EM Calorimeter Upgrade @ ACES2014 M. Hansen, CERN. [email protected]
HCAL
ECAL
ES
M. Hansen, CERN. [email protected]
End-cap calorimeter upgrade Proposal 1Shashlik ECAL
CMS HL-LHC EM Calorimeter Upgrade @ ACES2014
The Shashlik proposal comprises ECAL and a re-built full HCAL endcap
Readout chain very similar to ECAL barrel Hl-LHC upgrade and HCAL legacy / Phase 1 ~ECAL barrel system size: 61k channels
SiPM location alternatives In front of HCAL: InGaP PM and 3m analogue cable Behind HCAL: SiPM and 3m fiber carrying Shashlik light
ADC?PreAmp?
PDSiPM
PreAmp/ADC?
QIE10
Electronics location(s)
Intermediate Layer behind HCAL:- E.g. Igloo3 radtol FPGA- 10Gb optical link drivers- Services -- Power -- Controls
OFF-DETECTOR
M. Hansen, CERN. [email protected]
End-cap calorimeter upgrade Proposal 2Combined Forward Calorimeter
CMS HL-LHC EM Calorimeter Upgrade @ ACES2014
PD
SiPM
QIEx, TDC
OFF-DETECTOR
Scintillating fiber (Slow)
Quartz fiber (fast)
PD
SiPM
QIEx, TDC
ROC, e.g. Domino Ring Sampler; (“Sparsified” 5 GHz sampling)
FPGAe.g. Igloo 3
CFC Comprises full ECAL and full HCAL endcap Essentially three ~ECAL barrel sized readout systems
Scintillating, quartz, timing Fine timing data stored in ROC
Read out after L1A
Electronics located behind HCAL:- E.g. Igloo3 FPGA- 10Gb optical link drivers- Services -- Power -- Controls
L1A
M. Hansen, CERN. [email protected]
End-cap calorimeter upgrade Proposal 3High Granularity Calorimeter
HGC Comprises full ECAL and half HCAL endcap Combined with half re-built legacy HCAL Endcap
“Coarse” trigger primitives sent off detector Full granularity data stored in ROC
Read out after L1A
CMS HL-LHC EM Calorimeter Upgrade @ ACES2014
64 Chan FE ROC
TriggerPrimitives5Gbps e-link
RO/CTRL30k modules in 41 planesAbsorber interleaved
Intermediate Layer:Behind HCAL:- Map on 10Gb optical links- Services -- Power -- Controls (Fast and Slow)
OFF-DETECTOR
M. Hansen, CERN. [email protected]
Conclusion
Described the Legacy CMS ECAL Electronics system design and Status
Described few issues to be addressed with the upgrade of the CMS ECAL electronics system
Listed a set of CMS Requirements, general to CMS phase 1 and Phase 2 upgrades
Listed future R&D for the ECAL Barrel Calorimeter electronics upgrade
Briefly described options for the Endcap calorimeter upgrade
All in all, interesting time ahead of us
CMS HL-LHC EM Calorimeter Upgrade @ ACES2014