Meg commissioning engineering run 2007
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MEG Commissioning & Engineering Run 2007. Beam Time Goals & Constraints. Engineering Run Goals: all parts of the Detector Operational Read-out/Data-taking Chain tested all Triggers implemented + Rate Check full set of Calibration & Test Data contribute to “Long-term” Goal of

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MEG Commissioning & Engineering Run 2007

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Meg commissioning engineering run 2007

MEG Commissioning&Engineering Run 2007

MEG Review February 2008


Beam time goals constraints

Beam Time Goals & Constraints

  • Engineering Run Goals:

  • all parts of the Detector Operational

  • Read-out/Data-taking Chain tested

  • all Triggers implemented + Rate Check

  • full set of Calibration & Test Data

  • contribute to “Long-term” Goal of

  • understanding our Detector

  • Constraints:

  • Experiment Change-over -

  • Kottmann et al. beam time

  • - in total 2 weeks extra beam time given to them!!!

  • - 3-4 weeks for -beamline installation + BTS cool- down after Kottmann et al.

  • Calorimeter Cryostat delivery + seal problem

  • LXe HV feed through problem

optimal either Beginning

or End of a Period

 Only 3 Months available for Beam !!!

Calo. Delay

Feed through problem

but many task could

Progress in parallel

MEG Review February 2008


Commissioning engineering run

COMMISSIONING

Parasitic Run

Beam optimization

in parallel with

Debug, Tune &

Calibrate

Full Run

Full Trigger

Implementation

DAQ/Readout chain tested

Calibration & Test Data + CEX

LED, , C-W

Cosmics & Michel e+

Commissioning & Engineering Run

With 3 months to achieve proposed goals needed “rigid” organization & planning

but flexibility to implement changes

  • Run Coordindation group formed:

  • 6 beam coordinators + 1 offline coordinator

  • Split time into 2 overlapping parts:

2 x 12 Hrs

Only detector

Experts nights

  • to allow for flexibility + continuity:

  • Coordinators each 2 weeks

  • Daily Run Meetings (on-site)

  • Weekly Video Meeting (Calloboration) - strategy

  • Web-based schedule + shift list + on-call list

3 x 8 Hrs

Shift leader

+ 1 crew

MEG Review February 2008


Organization in practice

Organization In Practice

  • Information Access

  • “How to” information database for shift

  • crews on MEGWiki – grew with time

Example

  • Continuity + Schooling

  • staggered + overlapping shifts

  • basic 3 days/person shift-block

  • detector experts start as shift

  • leaders

MEG Review February 2008


Experimental conditions beam line

O2sensor

Experimental Conditions – Beam Line

  • (1) Improved COBRA He-environment: monitoring with O2-sensors ~ (97±1)%

  • - but air doping was needed for DCs

  • (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)!!!

slant angle =(12.5±0.5)°

vertical misalignment  =(22.8  5.0) mr

shift of Laser cross SHIFT =(5.51.0) mm

  • (3) New degrader needed (air doping + range-curve)

  • 300 m Mylar (old 480m CH2)

  • Now can transmit 1108 +/s to COBRA centre with Degrader (2mA Ip)

  • For Run used:

  • Ultra-low Intensity ~ 5106 -stops/s

  • Nominal Intensity ~ 3107 -stops/s

MEG Review February 2008


Detectors etc

Detectors etc.

TCs

DCs

  • TCs:

  • late arrival APD power

  • supplies + DAQ problems

Full complement

of detectors

  • DCs:

  • external HV problem in

  • pure He air-doping needed

  • Calo:

  • initial problems with HV

  • feedthroughs – noise +

  • splitter input-stage damaged

  • Liquid purification success

  • 70l/hr ~ 250 hrs for  > 3m

  • C-W:

  • proved v. successful

  • Li (17.6, 14.6 MeV)

  • + B (4.4, 11.7, 16.1 MeV)

  • targets – Energy + Timing

  • NaI:

  • automated mover

  • temp. contolled APDs

  • E/E ~5-6% ()

Calo.

C-W

NaI

MEG Review February 2008


Trigger daq

lcmeg05

lcmeg04

lcmeg03

lcmeg02

lcmeg01

Trigger + DAQ

Online

Cluster

Megonxx

Trigger

+ Splitters

  • Staged trigger implementation:

  • Single detectors + Michel trigger

  • Coincidence detectors e.g. DC+CR

  • TC+LXe rad.-decay, 11B C-W (narrow t=20 ns)

  • TC+DC

  • Direction matching  e (planned TC fibres)

  • too slow  XEC PMT-index + TC-bar(index,z)

  • where z from bar charge-ratio

  • 24 Trigger types introduced (max. 32)

  • Multiple triggers with prescaling  Read-out

  • Trig. Monitoring (cyclic-buffers) Works nicely

DRS v2

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

  • Limits:

  • DAQ/DRS readout limited by VME (83MB/s)

  • ~ 30 events/s full waveforms (threading)

  • Online (backend) 1.2TB storage

  • Offline (lcmeg) 64 CPUs + 50TB disk

  • “Lazylogger” autocopy Online Offline

  • factor 2 compression

Offline

Cluster

lcmeg

MEG Review February 2008


Meg monitoring tools

MEG Monitoring Tools

SCS2000

controller

  • 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

Midas History

MSCB Area Network

  • ONLINE:

  • Data Quality using Argus MEGanalyzer with Event Display

    digital oscilloscope for all channels

    LXe, TCs, DCs, NaI, Trig., DRS included

  • Midas Voice Alarm system

MEGanalyzer

MEG Review February 2008


Cex calorimeter 0 calibration

Eg

170o

175o

q

54.9MeV

82.9MeV

1.3MeV for q>170o

0.3MeV for q>175o

H~ 8.5 mm

fully contained

V~ 7.5 mm

Eg

CEX – Calorimeter 0-Calibration

After Data-taking with  e trigger

still time for planned “reduced” CEX Run:

LH2-target setup/testing

in // with muon data-taking

outside zone

NaI

~ 5 days Data-taking

450 Runs ~ 2.2 M events

  • Setup

  • -Beam > 1.4 MHz of 70.5 MeV/c -

  • LH2-Target + Control & Stabilization System

  • LHe supply (dewars)

  • 9-Crystal NaI array + Pb/Scintillator as Tag

  • LXe Calorimeter

LH2-target

MEG Review February 2008


Summary

Summary

  • Due to the “Great Effort” by All – we were able

  • to meet our goals for the Engineering Run

  • having tested ALL Detector Parts

  • implemented all Trigger Chains & checked Rates

  • full set of Calibration & “Physics” Data taken

In Total

9974 Runs taken amounting to

~ 29.5 TB of Data

Analysis is in progress !!!

RunData

Data transferred TB

Chronology

MEG Review February 2008


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