If you have comments or suggestions, email me at helbich@mail.desy.de
Columbia:See the Hardware tasks, software tasks and analysis tasks.Miroslav Helbich (MH) Stathes Paganis (SP) Bill Schmidke (BS) Allen Caldwell (AC) Frank Sciulli (FS) Yujin Ning (YN) (2002) Yuanbo Zhang (YZ) (2002)
Summer students:
Keewee Tan, Yuanbo Zhang, Monica Skoge, Ann Smith (2001)
Karina Loureiro (2000)DESY:
Jan Hauschildt (JH) Uwe Schneekloth (US)
| TASK | DESCRIPTION | TIME | PEOPLE | STATUS |
| Integrate the system with new electronics. | The new electronics for the final version has to be integrated to the system and all the system has to be tested and understood. | Fall 01 | SP+MH+YN | STARTED.
Light test is working. FEE is working. |
| Power up and test thedetectors in situ | Put High voltage on all channels and make sure everything is working. | Before Lumi | All | Both detectors tested. Some cables cannot hold HV and were replaced.
Few channels don't respond.
COMPLETED! |
| Installation of collimators | Both moving and beam collimator has to be put into the tunnel and positioned wrt photon beam. Special adjustable platform has to be built. | May 2001 | JH+MH+BS | COMPLETED! |
| Exit window installation | Measure exit window thickness, position survey mark and install window in the tunnel | March 2001 | US | Window thickness measured ( results
).
COMPLETED! |
| Magnet Installation | Installation of magnet into the hall | 16.March 2001 | US+all | COMPLETED! |
| Detector support structure | design, construction, shielding, manufacturing and installation | Until
2.May 2001 |
SP, MH, JH | Designing Ready!
Construction COMPLETED! Support structure on place! |
| Spectrometer Detector installation | Put detectors in the tunnel, limited by crane operation scheduling | 26.March 2001 | all | Detectors are in place!
COMPLETED |
| Position surveying | Alignment of window, collimator, magnet and LSD's need to be known to 0.3 mm | August 2001 | MH, US | Designing Specifications. Surveying will be done by DESY survey group.
Window surveyed. Magnet surveyed.
COMPLETED! |
| Electronics infrastructure | Cables, connectors, general tunnel operations | - | Jim Crittenden | COMPLETED! |
| Beam Collimator | Design, construction, installation | 2.May 2001(?) | MH, JH | Design ready. Construction COMPLETED! |
| Calibration (moving) collimator | Design, construction, installation | Before position survey? | BS, MH | COMPLETED! |
| Table for moving collimator | Table, electronics, slow control | 2.May 2001 | BS | Aluminum platform ready in the tunnel.
Table from 35m tagger is used. Table installed and connected to slow control. COMPLETED! |
| High Voltage | Installation and testing. | 8.May 2001 | SP + MH+student | HV cables put under the floor. Broken cables identified. 10 spare cables
put under the floor.
Should we change all the cables? All cables changed. HV boxes and Communication boxes repaired an NIKHEF. System is now working. COMPLETED! |
| New LED system interface | ? | ? | SP | Light distribution system tested for both LSDs and proven to work.
Automatization and testing in situ not started yet. COMPLETED |
| Examine and test the possibility of by-passing the FEE | Pulses from LSD's are narrow even after propagating in the cable and integrated charge is linear in energy down to 45ns gate as measured in the test beam | ? | ? | Progress |
| Radiation monitors | Location, readout, installation, calibration, monitoring | Until
July -August 2001 |
MH + W.Wierba+student | Design of prototype ready. Construction of two prototype modules
in progress.
Temporarily the PRLs were placed in the spectrometer area. |
| Cooling of collimator and magnet | Design and installation | 2.May 2001 | HERA | COMPLETED |
| Electrical connection of magnet | - | 2.May 2001 | HERA | COMPLETED |
| Operation of magnet | Discuss with HERA people | ? | ? | COMPLETED
(see faq) |
| BBL3 | Specify the system of alarms and interlocks required by spectrometer | May 2001 | MH + all | COMPLETED |
| Helium Bag | Manufacturing and installation od bag and gas system | 2.May 2001 | SP, DESY(?) | Gas system installed.
Helium bag installed. Bag geometry is not satisfying. Gas system has problems. |
| TASK | DESCRIPTION | TIME | PEOPLE | STATUS |
| Data taking | Take the first data | Spring 2002 | MH,SP | Started |
| Light tests | Write a small program to monitor the LED initiated response of the spectrometer. | Spring 2002 | YN,MH | In progress |
| Charge tests | Write a small program to analyze the response of the charge test and pass the calibration information to calibration in FPGAs. | Spring 2002 | YN | In progress |
| DAQ | Test the new DAQ and implement the luminosity calculation code. | Spring 2002 | MH,SP | Started |
| GEANT | Make geant to work for production. | Summer 2001 | SP, YZ | In Progress.
Some data form Geant already generated. Modifications done by YZ? |
| LumiFast | Fast simulation for the spectrometer. | Fall 2001 | MH | COMPLETED! |
| Slow control and Software | - | Summer 2001 | all + Wojtek and Tomas | COMPLETED! |
| Algorithms to calculate Luminosity | Specification of needed data, development and implementation of algorithms | Summer 2001 | all | Started |
| Online Histogramming | Root, QT, QT +Root
Developement + testing |
Summer 2001 | SP + MH | Simple test version in Root is working.
QT based display from Tomek and Wojtek working. |
| Test the whole Analysis software chain with mock data | Use data form Geant and Test Beam for testing and debugging the software | Summer 2001 | SP + MH | Not started yet |
| Define the trigger board types and counters for spectrometer | _ | ASAP | SP+all | COMPLETED! |
| TASK | DESCRIPTION | PEOPLE | STATUS |
| Acceptance calculation | Calculate spectrometer acceptance using GEANT | students | LumiFast simulation finished |
| Exit window studies | Study conversion probability in the exit window. Study effects of secondary interactions inside the window. | Keewee + MH | COMPLETED! |
| Algorithms to calculate Luminosity | Specification of needed data, development and implementation of algorithms | all | In Progress |
| Systematic error studies | Stability of the luminosity measurement against various factors has to be examined in order to be able to assign error on the measurement. | MH+all | In progress |
| In situ alignment of the system | Luminosity calculation is sensitive to relative alignment of the exit window, collimators, magnet and the detectors to the photon beam. Few in situ methods has been proposed and are in investigation phase. | MH+Yuanbo | Started |
| Energy calibration | Energy calibration will be done by use of the moving collimator with 2mm slit in it. Measurement of end-point spectrum of bremstrahlung photons will cross-check the calibration. | MH+all | Started |
| Pile-up correction function | Correction for pileup has to be applied in order to get corrected rates. The correction function will be studied by GEANT. | MH | Fast simulation studies ready. |
| Smearing function | In order to unfold measured profiles we need smearing function S(x,y,E,xg,yg,Eg)
as a probability to reconstruct x,y,E given xg,yg,Eg of the photon hitting
the exit window.
This study requires to wotk with GEANT. |
? | Not started yet |
| Magnetic field | Magnetic field has been measure at few points. The goal is to interpolate measurements between the points and with the help of Maxwell equations calculate other two components of the field. Errors due to interpolations seem to be non-negligible and have to be studied. In addition proton beam-pipe shielding has been moved since measurements. The corresponding change will be calculated using program OPERA. | Monica + MH+YN | COMPLETED! |
If you have comments or suggestions, email me at helbich@mail.desy.de