# Presentation: 546935

## HCAL Constants

**Shuichi Kunori**
**U of Maryland**
**21-July-2003**
**LHC and CMS**
**HCAL plan**
**Four Databases**

**Caution - All information in these slides are very preliminary and some may be wrong. **

## The LHC

**R = 4.5 Km**
**E = 7+7 TeV (pp)**
**crossing rate**
**   ****=40MHz**
**     ****(25nsec)**
**design luminosity**
**   ****= 10****34****cm****-2****s****-1**
**~20 pp interactions**
**   ****per crossing**
**   ****at design luminosity**** **

**h ******** 4 ******** with 20 min. bias evt.**

## The CMS detector

**All silicon tracker**
**     ****micro strips   (10M ch)**
**     ****pixel                (40M ch)**
**     ****(5.4m long, 2.4m ********:  |********| <2.4)**
**Hermetic calorimeter**
**     ****ECAL: PbWO4 crystal**
**     ****HCAL: brass+scinti.**
**          ****( |********| <3.0)**
**in 4 Tesla solenoid**
**     ****(12.5m long, 6m ******** in)**
**Robust muon system**
**     ****DT+RPC (barrel)**
**     ****CSC+RPC (endcap)**
**       ****(in iron yoke:   |********| <2.4)**
**     **
**Fast cerenkov calor.**
**     ****quartz fibber **
**          ****( 3<|********|<5)**

**Toal weight            12500 t**
**Overall diameter    15 m**
**Overall length        21.6 m**

## Installation of the first muon chamber

**Installation of the first muon chamber**

**Surface buildings and main shaft**

**HCAL barrel**

**HCAL/Muon endcap**

**Muon barrel yoke**

## Transfer YB0 (2000t) in 2005

**Transfer YB0 (2000t) in 2005**

## HCAL plan

**2003 June-September**
**Calibration runs in the H2 testbeam at CERN**
- All HCAL subdetectors: HB, HE, HF, HO + Crystals
**2004 Summer-**
**Low energy testbeam at H2**
- EC+HC response to low energy beam
- hadron showers at low energy
**Slice test with EMU, TRIG and DAQ at CMS.**
- Full system test - hardware & software & operation
**2005**
**Transfer HCAL to the under-ground experimental hall.**
**2006**
**Test beam (?)**
**Integration and commissioning**
**2007 **
**Data taking**

## Conditions Database

**All information needed for event reconstruction (HLT/Offiline)**
**HB, HE, HO : scintillator/brass sampling calorimeter**
**         ****scint. - ****HPD – QIE (ADC) – HTR (Trig Primitive/pipeline) – L1/DAQ**
**HF : quartz fiber/iron calorimeter**
**         ****fibers -**** ****PMT – QIE (ADC) – HTR (Trig Primitive/pipeline) – L1/DAQ**
**Readout channels ~ 10k**
**Stable detector – no need to update constants frequently, hopefully.**
**HF gain will decrease due to radiation damage (slow time constant).**
**Constants – from ADC counts to GeV**** **
**     ****1) ****Channel response (scint-HPD-QIE)          1              * 10k (ch)**
**      ****2) QIE calibration  (ADC-to-Charge(fC) )    128 (bin)    * 10k (ch)**
**      ****3) Charge-to-GeV   (HB,HE,HO,HF)               1              * 4**
**      ****4) Pedestal                                                      4 (capid) * 10k (ch)**
**      ****+) Channel# – (eta,phi,depth) map**

## Configuration DB

**All information required to bring the detector in any running mode.**
**Run modes:**
**     ****1) beam,  2) pedestal  3) source calib  4) laser calib  5) LED calib**
**Constants (on detector)**
**     ****HPD/PMT       - HV                         1/(HPD or PMT)**
**     ****CCM               - clock phase          1/(ch)**
**     ****CalibModule  - mode+**
**Constants (in counting room)**
**     ****HTR            - pedestal                           1/(ch)**
**                        ****- LUT(ADC-to-GEV)     1LUT/(ch)**
**                        ****- threshold                          1/(ch)**
**     ****TTC            - timing**

## Integration Database

**All information to physically set up the detector and is used for asset tracking**
**Detector components: (on detector)**
**    ****1) Absorber**
**    ****2a) Megatile**
**    ****2b) Quartz fiber bundle (HF)**
**    ****3) Optical cable**
**    ****4) RBX(readout box) **
**    ****4.1) RM{ODU, HPD(PMT), QIE}**
**    ****4.2) CCM**
**    ****4.3) Calibration Module **
**    ****5) Cable**
**    ****+) shielding, support (HF)**
**Detector components: (in counting room)**
**    ****1) Crate**
**    ****1.1) HTR**
**    ****1.2) TTC**
**Channel map ****    (eta,phi,depth)********megatile********optical cable********RM{ODU,HPD,QIE}********HTR(ch)}**

## Construction/Hardware DB

**C-DB: all information about the sub detector construction up to the start **
**          ****of integration.**
**H-DB: all information required for cross checking calibration constants and **
**          ****for detector simulation.**
**Detector components: (on detector)**
**    ****1) Absorber                                    ****- dimension, source tube location (HF)**
**    ****2a) Megatile/fibers                         ****- dimension, fiber length, att.length, source scan**
**    ****2b) Quartz fiber bundle (HF)         ****- type**
**    ****3) Optical cable                              ****- length**
**    ****4) RBX(readout box)                      ****-**
**    ****4.1) RM{ODU, HPD(PMT), QIE}     ****- HPD(PMT) gain, QIE(ADC********fC, timing), map**
**    ****4.2) CCM                                         ****-**
**    ****4.3) Calibration Module                 ****-**
**    ****5) data cable                                   ****-**
**    ****+) shielding, support (HF)**
**Detector components: (in counting room)**
**    ****1) Crate**
**    ****1.1) HTR**
**    ****1.2) TTC**
**Calibration Data**

## Additional slides

## Data Flow

**>>> **_**front end**_** <<<**
**Scint. Lights**
**->Tile->Fiber1&2->OptCable**
**->HPD->Amp->ADC->**
**Charge (for 5-10xings)**
**->(L1Path)**
**->(DAQPath)**
**>>> **_**L1Path**_** <<<**
**->****HTR ****(ch)**
**E****T****(L1Primitive: 8bits:non-linear)**
**->****L1 LUT ****(ch)**
**E****T****(4x4 HcTower: 8bits:linear)**
**->L1Calo**
**E****T****(L1jets),Et(L1tau),Et(L1MET)**
**->L1CaloGlobal(****Threshold ****(obj)****)**
**->L1Global**
**L1Trigger**

**>>> after **_**DAQPath**_** <<<**
**->ReadoutAnalyzer ****(ch)**
**E****T****(channel)**
**->TowerCreator**
**E****T****(Ec+Hc Tower)**
**->Jet/MET/tauReco**
**E****T****(jetR),Et(tauR),Et(METR)**
**->EtCaloCorrection ****(obj)**
**      ****(corr. for linearlity)**
**E****T****(JetC),Et(tauC),Et(METC)**
**->EtPhysCorrection ****(obj)**
**      ****(corr. for out-of-cone)**
**E****T****(Parton)**

**Calibration/correction**
**(ch)**** - channel by channel**
**(obj)**** - phys. Obj, (jet, tau, MET)**

## Tools

**A) Megatile scanner:**
**- Co****60**** gamma source**
**- each tile: light yield**
**- during construction**
**all tiles**
**B) Moving radio active source:**
**- Co****60**** gamma source**
**- full chain: gain**
**- during CMS-open (manual)**
**all tiles**
**- during off beam time (remote)**
**tiles in layer 0 & 9**
**C) UV Laser:**
**- full chain: timing, gain-change**
**- during off beam time**
**tiles in layer 0 & 9**
**all RBX**
**D) Blue LED:**
**- timing, gain change**
**- during the off beam time**
**all RBX**

**E) Test beam**
**- normalization between**
**GeV vs. ADC vs. A,B,C,D**
**- ratios: elec/pion, muon/pion**
**- before assembly**** **
**a few wedges**
**F) Physics events**
**- mip signal, link to HO**
**muon**
**- calo energy scale (e/pi)**
**charged hadron**
**- physics energy scale**
**Min-bias**
**photon+jet balancing**
**Z+jet balancing**
**jet-jet balancing**
**di-jet mass**
**W->jj in top decay **
**>> non-linear response**
**>> pile-up effect**

## Scenario (HB/HE)

**1) Before megatile insertion**
**- megatile scanner:          ****all tiles**
**- moving wire source:      ****all tiles**
** ****.**
**2.1) After megatile insertion**
**- moving wire source:****      ****all tiles / 2 layer**
**- UV laser:                         ****2 layers/wedge**
**.      **
**2.2) After megatile insertion**
**- test beam****:                       ****a few wedges****.**
**.**
**3) Before closing the CMS**
**- moving wire source:      ****all tiles**
**- UV laser & blue LED:     ****all RBX**
**(do 3, about once/year)**
**.    **
**4) Beam off times   **
**- moving wire source:      ****2layer/wedge**
**- UV laser:                         ****2 laer/wedge**
**- UV laser & blue LED:     ****all RBX**
**.  **
**5) Beam on (in situ)**
**- jets / tau / MET               ****ECAL+HCAL**

**Absolute calib.**
**Accuracy of 2%**
**for single particle**

**Monitor for change**
**with time**
**Accuracy < 1%**

**(same to HF)**

**once/month**

**a few times/day (?)**