THE BRIEF HISTORY OF LuMo CONSTRUCTION FROM MIT

TO HU

OZGUR ATESHAMPTON UNIVERSITY

OLYMPUS COLLABORATION MEETING 26-27 APRIL 2011

Luminosity Monitors: Telescopes

Forward telescopes

12o

2 tGEM telescopes, 1.2msr, 12o,R=187/237/287cm, dR=50cm, 3 tracking planes

TOF

LEPTON

PROTON

LEPTON

PROTON

1. Handling The Olympus GEMs at MIT-BATES between June 6th-August 8th 2010

Received the total 51 GEMs come with 5 Batches

Optically Inspected 100% of the GEMs @ MIT

CCD Scanned 30% of the GEMs @ MIT

HV-Tested 100% of the GEMs @ MIT

Glued into the Frames 4 GEMs @ BATES

A DEFECTIVE GEM LAYER FROM CCD SCANNER

Bar Graphs of Inner(left) and Outer(right) Diameters of LUMI Foils

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2. Manufacturing The GEMs at HU-GEM LAB

Stretching and Gluing of GEM+MYLAR+HV Foils

Leakage Current Test using GEM2D Box

Readout Boards – Shortcuts and How To Fix Them...

Up to 5 shorts per board possible Checked all boards with Ohmmeter for shorts Found between 0 and 7 (8?) per board, typically ~3 Verified under microscope and fixed them Currently 8 boards without any shorts

Readout Boards – Shortcuts and How To Fix Them...

blown with current from a 9V battery

Readout Boards – Shortcuts and How To Fix Them...

Readout Boards – Shortcuts and How To Fix Them...

scratched with knife

FIRST SIGNALS FROM GEMS (JUERGEN’s TALK)

SOLDERING PINS INTO THE GEM FRAMES

Gluing Process of The Chambers

PACKING THE CHAMBERS

The Status of The GEM Manufacturing

• Glued 9 GEM Chambers(6+3 Spares):-- 27 GEM Foils--18 Pressure(Mylar) Foils--9 High Voltage Foils--9 Readout Boards with NO Shorts--7 chambers checked with picoammeter.We shipped from HU and we received last week at

here DESY!

LUMI Gas System Test Beam in May

• Many configurations were simulated.• Varied intrinsic res. and distance between

tracking planes.• 100 µm intrinsic res. and 50 cm gap between

Gem1/2 and Gem2/3 show the optimum performance.

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MC Simulation of the GEMsDesign Parameters: Resolutions

Left Sec. RESOLUTIONS

Proton DeltaZ

Electron DeltaZ

Proton Del.Theta

Electron Del.Theta

Proton DeltaPhi

Electron DeltaPhi

Proton DeltaP

Electron DeltaP

100mic./50cmLUMI + MWPC

1.60 mm 1.18 cm 0.52 Deg. 0.09 Deg. 0.52 Deg. 0.22 Deg. 20 MeV 59 MeV

LUMI MS STUDIES --MC runs now on bird@DESY, HUPPCF@HU,

blaster@KPHMZ--We have ROOT files on disk with XY beam offsets--We will analyze those runs soon (NAS is ready now)

***Beam offsets were -1, -0.75, -0.5, -0.25, 0., +0.25, +0.5, +0.75, +1 mm.

Next Steps with the New MC Code:

• Study of systematic effects (beam offset, slope, width; etc.) (ONGOING)

• Simulations of acceptance and count rates

• Simulation of backgrounds

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