Peter-Raymond Kettle MEG Review February 2008 1 MEG Commissioning & Engineering Run 2007

Peter-Raymond KettlePeter-Raymond Kettle MEG Review February 2008MEG Review February 2008 11

MEG MEG CommissioningCommissioning

&&Engineering Engineering Run 2007Run 2007

MEG MEG CommissioningCommissioning

&&Engineering Engineering Run 2007Run 2007


Beam Time Goals & ConstraintsBeam Time Goals & ConstraintsBeam Time Goals & ConstraintsBeam Time Goals & ConstraintsEngineering Run Goals:Engineering Run Goals:

all parts of the Detector Operationalall parts of the Detector Operational

Read-out/Data-taking Chain testedRead-out/Data-taking Chain tested

all Triggers implemented + Rate Checkall Triggers implemented + Rate Check

full set of Calibration & Test Data full set of Calibration & Test Data

contribute to “Long-term” Goal ofcontribute to “Long-term” Goal of understanding our Detectorunderstanding our Detector

Constraints:Constraints: Experiment Change-over -Experiment Change-over - Kottmann et al. beam timeKottmann et al. beam time

- in total 2 weeks extra beam time given to them!!!- in total 2 weeks extra beam time given to them!!! - 3-4 weeks for - 3-4 weeks for -beamline installation + BTS cool- -beamline installation + BTS cool- down after Kottmann et al. down after Kottmann et al.

Calorimeter Cryostat delivery + seal problemCalorimeter Cryostat delivery + seal problem LXe HV feed through problemLXe HV feed through problem

optimal either Beginning or End of a Periodoptimal either Beginning or End of a Period

Calo. DelayCalo. DelayFeed through problemFeed through problemCalo. DelayCalo. DelayFeed through problemFeed through problem

but many task couldbut many task couldProgress in parallelProgress in parallel

Only 3 Months available for Beam !!! Only 3 Months available for Beam !!!


Commissioning & Engineering Run Commissioning & Engineering Run Commissioning & Engineering Run Commissioning & Engineering Run With 3 months to achieve proposed goals needed “rigid” organization & planning but flexibility to implement changesWith 3 months to achieve proposed goals needed “rigid” organization & planning but flexibility to implement changes

Run Coordindation group formed:Run Coordindation group formed: 6 beam coordinators + 1 offline coordinator6 beam coordinators + 1 offline coordinator Split time into 2 overlapping parts:Split time into 2 overlapping parts:

COMMISSIONINGCOMMISSIONINGCOMMISSIONINGCOMMISSIONING

Full RunFull RunFull Trigger Full Trigger

ImplementationImplementationDAQ/Readout chain testedDAQ/Readout chain tested

Calibration & Test Data + CEXCalibration & Test Data + CEX

Full RunFull RunFull Trigger Full Trigger

ImplementationImplementationDAQ/Readout chain testedDAQ/Readout chain tested

Calibration & Test Data + CEXCalibration & Test Data + CEX

Parasitic RunParasitic RunBeam optimizationBeam optimization

in parallel within parallel withDebug, Tune &Debug, Tune &

CalibrateCalibrate

Parasitic RunParasitic RunBeam optimizationBeam optimization

in parallel within parallel withDebug, Tune &Debug, Tune &

CalibrateCalibrate

LED, LED, , C-W, C-WCosmics & Michel eCosmics & Michel e++

LED, LED, , C-W, C-WCosmics & Michel eCosmics & Michel e++

2 x 12 HrsOnly detectorExperts nights

2 x 12 HrsOnly detectorExperts nights

3 x 8 HrsShift leader+ 1 crew

3 x 8 HrsShift leader+ 1 crew

to allow for flexibility + continuity:to allow for flexibility + continuity: • Coordinators each 2 weeksCoordinators each 2 weeks• Daily Run Meetings (on-site)Daily Run Meetings (on-site)• Weekly Video Meeting (Calloboration) - strategyWeekly Video Meeting (Calloboration) - strategy• Web-based schedule + shift list + on-call listWeb-based schedule + shift list + on-call list


Organization In PracticeOrganization In PracticeOrganization In PracticeOrganization In Practice

Continuity + SchoolingContinuity + Schooling • staggered + overlapping shiftsstaggered + overlapping shifts

• basic 3 days/person shift-blockbasic 3 days/person shift-block

• detector experts start as shift detector experts start as shift leadersleaders

Exam

ple

Exam

ple

Information AccessInformation Access • “ “How to” information database for shift How to” information database for shift

crews on MEGWiki – grew with timecrews on MEGWiki – grew with time


Experimental Conditions – Beam LineExperimental Conditions – Beam LineExperimental Conditions – Beam LineExperimental Conditions – Beam Line (1) Improved COBRA He-environment: monitoring with O2-sensors ~ (97±1)%

- but air doping was needed for DCs

(1) Improved COBRA He-environment: monitoring with O2-sensors ~ (97±1)% - but air doping was needed for DCs

O2sensorO2sensor

(2) Target found to be slightly misaligned!

target made for = 21° but due to DC support could only be 13° inclined expect only ~ 75% of s to hit target for 2007

(2) Target found to be slightly misaligned!

target made for = 21° but due to DC support could only be 13° inclined expect only ~ 75% of s to hit target for 2007

!!! Laser check (estimate)!!!!!! Laser check (estimate)!!! slant angle slant angle =(12.5=(12.5±0.5)°±0.5)°vertical misalignment vertical misalignment =(22.8 =(22.8 5.0) mr 5.0) mrshift of Laser cross shift of Laser cross SHIFTSHIFT =(5.5 =(5.51.0) mm1.0) mm

!!! Laser check (estimate)!!!!!! Laser check (estimate)!!! slant angle slant angle =(12.5=(12.5±0.5)°±0.5)°vertical misalignment vertical misalignment =(22.8 =(22.8 5.0) mr 5.0) mrshift of Laser cross shift of Laser cross SHIFTSHIFT =(5.5 =(5.51.0) mm1.0) mm

(3) New degrader needed (air doping + range-curve) 300 m Mylar (old 480m CH2) Now can transmit 1108 +/s to COBRA centre with Degrader (2mA Ip)

For Run used: Ultra-low Intensity ~ 5106 -stops/s Nominal Intensity ~ 3107 -stops/s

(3) New degrader needed (air doping + range-curve) 300 m Mylar (old 480m CH2) Now can transmit 1108 +/s to COBRA centre with Degrader (2mA Ip)

For Run used: Ultra-low Intensity ~ 5106 -stops/s Nominal Intensity ~ 3107 -stops/s


Detectors etc. Detectors etc. Detectors etc. Detectors etc. TCsTCs DCsDCs

Calo.Calo. NaINaI

Full complement of detectorsFull complement of detectors

Calo:Calo:• initial problems with HV initial problems with HV feedthroughs – noise +feedthroughs – noise + splitter input-stage damagedsplitter input-stage damaged• Liquid purification successLiquid purification success 70l/hr ~ 250 hrs for 70l/hr ~ 250 hrs for > 3m > 3m

Calo:Calo:• initial problems with HV initial problems with HV feedthroughs – noise +feedthroughs – noise + splitter input-stage damagedsplitter input-stage damaged• Liquid purification successLiquid purification success 70l/hr ~ 250 hrs for 70l/hr ~ 250 hrs for > 3m > 3m

DCs:DCs:• external HV problem in external HV problem in pure He air-doping needed pure He air-doping needed

DCs:DCs:• external HV problem in external HV problem in pure He air-doping needed pure He air-doping needed

TCs:TCs:• late arrival APD power late arrival APD power supplies + DAQ problemssupplies + DAQ problems

TCs:TCs:• late arrival APD power late arrival APD power supplies + DAQ problemssupplies + DAQ problems

C-W:C-W:• proved v. successfulproved v. successfulLi (17.6, 14.6 MeV)Li (17.6, 14.6 MeV)+ B (4.4, 11.7, 16.1 MeV)+ B (4.4, 11.7, 16.1 MeV)targets – Energy + Timingtargets – Energy + Timing

C-W:C-W:• proved v. successfulproved v. successfulLi (17.6, 14.6 MeV)Li (17.6, 14.6 MeV)+ B (4.4, 11.7, 16.1 MeV)+ B (4.4, 11.7, 16.1 MeV)targets – Energy + Timingtargets – Energy + Timing

NaI:NaI:• automated moverautomated mover• temp. contolled APDstemp. contolled APDs• E/E ~5-6% (E/E ~5-6% ())

NaI:NaI:• automated moverautomated mover• temp. contolled APDstemp. contolled APDs• E/E ~5-6% (E/E ~5-6% ())

C-WC-W


Trigger + DAQTrigger + DAQTrigger + DAQTrigger + DAQ Trigger+ Splitters Trigger+ Splitters

Online ClusterMegonxx

Online ClusterMegonxx Staged trigger implementation:Staged trigger implementation:

Single detectors + Michel triggerSingle detectors + Michel trigger Coincidence detectors Coincidence detectors e.g. DC+CRe.g. DC+CR

TC+LXe rad.TC+LXe rad.-decay, -decay, 1111B C-W (narrow B C-W (narrow t=20 ns)t=20 ns) TC+DCTC+DC

Direction matching Direction matching ee (planned TC fibres)(planned TC fibres) too slow too slow XEC PMT-index + TC-bar(index,z) XEC PMT-index + TC-bar(index,z) where z from bar charge-ratiowhere z from bar charge-ratio

24 Trigger types introduced (max. 32)24 Trigger types introduced (max. 32)Multiple triggers with prescaling Multiple triggers with prescaling Read-out Read-out

Trig. Monitoring (cyclic-buffers) Works nicelyTrig. Monitoring (cyclic-buffers) Works nicely

Staged trigger implementation:Staged trigger implementation:

Single detectors + Michel triggerSingle detectors + Michel trigger Coincidence detectors Coincidence detectors e.g. DC+CRe.g. DC+CR

TC+LXe rad.TC+LXe rad.-decay, -decay, 1111B C-W (narrow B C-W (narrow t=20 ns)t=20 ns) TC+DCTC+DC

Direction matching Direction matching ee (planned TC fibres)(planned TC fibres) too slow too slow XEC PMT-index + TC-bar(index,z) XEC PMT-index + TC-bar(index,z) where z from bar charge-ratiowhere z from bar charge-ratio

24 Trigger types introduced (max. 32)24 Trigger types introduced (max. 32)Multiple triggers with prescaling Multiple triggers with prescaling Read-out Read-out

Trig. Monitoring (cyclic-buffers) Works nicelyTrig. Monitoring (cyclic-buffers) Works nicelylcmeg05lcmeg05lcmeg05lcmeg05

lcmeg04lcmeg04lcmeg04lcmeg04




OfflineClusterlcmeg

OfflineClusterlcmeg

Limits:Limits:• DAQ/DRS readout limited by VME (83MB/s)DAQ/DRS readout limited by VME (83MB/s) ~ 30 events/s full waveforms (threading)~ 30 events/s full waveforms (threading)• Online (backend) 1.2TB storageOnline (backend) 1.2TB storage• Offline (lcmeg) 64 CPUs + 50TB disk Offline (lcmeg) 64 CPUs + 50TB disk • “ “Lazylogger” autocopy Online Lazylogger” autocopy Online Offline Offline factor 2 compressionfactor 2 compression

DRS3 – tested improved DRS3 – tested improved (clock signals, temp eff. Etc.)(clock signals, temp eff. Etc.)

DRS v2DRS v2


MEG Monitoring ToolsMEG Monitoring ToolsMEG Monitoring ToolsMEG Monitoring Tools

MSCB Area NetworkMSCB Area Network

SCS2000controllerSCS2000controller

In order to ensure smooth experimental running

!!! monitoring essential !!!SLOW-CONTROL: MSCB-submaster+ SCS2000 + dedicated LabView control software Midas history virtually all equipment monitored & logged

In order to ensure smooth experimental running

!!! monitoring essential !!!SLOW-CONTROL: MSCB-submaster+ SCS2000 + dedicated LabView control software Midas history virtually all equipment monitored & loggedONLINE:ONLINE:

Data Quality using Argus MEGanalyzer with Event DisplayData Quality using Argus MEGanalyzer with Event Display digital oscilloscope for all channelsdigital oscilloscope for all channels LXe, TCs, DCs, NaI, Trig., DRS included LXe, TCs, DCs, NaI, Trig., DRS included Midas Voice Alarm systemMidas Voice Alarm system

MEGanalyzerMEGanalyzer

Midas HistoryMidas History


CEX – Calorimeter CEX – Calorimeter 00-Calibration-CalibrationCEX – Calorimeter CEX – Calorimeter 00-Calibration-Calibration

54.9MeV 82.9MeV

1.3MeV for >170o

0.3MeV for >175o

170o

175o

After Data-taking with After Data-taking with e e trigger trigger still time for planned “reduced” CEX Run:still time for planned “reduced” CEX Run:

LH2-targetLH2-target

SetupSetup

• -Beam > 1.4 MHz of 70.5 MeV/c -Beam > 1.4 MHz of 70.5 MeV/c --

• LHLH22-Target + Control & Stabilization System-Target + Control & Stabilization System• LHe supply (dewars)LHe supply (dewars)• 9-Crystal NaI array + Pb/Scintillator as Tag9-Crystal NaI array + Pb/Scintillator as Tag• LXe CalorimeterLXe Calorimeter

NaINaI

LHLH22-target setup/testing-target setup/testing

in // with muon data-takingin // with muon data-takingoutside zoneoutside zone

~ 5 days Data-taking~ 5 days Data-taking450 Runs ~ 2.2 M events450 Runs ~ 2.2 M events

HH~ 8.5 mm~ 8.5 mm

VV~ 7.5 mm~ 7.5 mm

fully containedfully contained


SummarySummarySummarySummaryDue to the “Great Effort” by All – we were able Due to the “Great Effort” by All – we were able to meet our goals for the Engineering Runto meet our goals for the Engineering Run

• having tested ALL Detector Parts having tested ALL Detector Parts • implemented all Trigger Chains & checked Ratesimplemented all Trigger Chains & checked Rates• full set of Calibration & “Physics” Data takenfull set of Calibration & “Physics” Data taken

RunDataRunData

In TotalIn Total

9974 Runs taken amounting to9974 Runs taken amounting to ~ 29.5 TB of Data~ 29.5 TB of Data

Analysis is in progress !!!Analysis is in progress !!!

In TotalIn Total

9974 Runs taken amounting to9974 Runs taken amounting to ~ 29.5 TB of Data~ 29.5 TB of Data

Analysis is in progress !!!Analysis is in progress !!!

ChronologyChronology

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Documents

Peter-Raymond Kettle MEG Review February 2008 1 MEG Commissioning & Engineering Run 2007