f.murtas1 lumi gem bremsstrahlung dafne bhabha dafne upgrade

F.MurtasF.Murtas 11LUMI GEMLUMI GEM

Bremsstrahlung Bremsstrahlung MonitorMonitor@ Dafne@ Dafne

Bhabha MonitorBhabha Monitor@ Dafne Upgrade@ Dafne Upgrade


Gas Electron MultiplierGas Electron Multiplier

70 µm 140 µm

A Gas Electron Multiplier (F.Sauli, NIM A386 531 1997) is made by 50 m thick kapton foil, copper clad on each side and perforated by an high surface-density of bi-conical channels;

50 µm

31x31 cm2


A Triple GEM luminometerA Triple GEM luminometer

A triple GEM 10x10 cm2 has been built with a 64 pixel 3 x3 mm2

10 cm

10 cm2.4 cm

2.4 cm

64 pads

The read out has been realized using 8 chip ASDQ (8 channel each)

Actually non more than 64 channel readout is possible;


3GEM lumi setup3GEM lumi setup

The 3GEM chamber has been put at 0 degrees, between the two Dafne Beampipes

The chamber was misaligned due to dimension of FEE mother board (the mother board touches the positron beam pipe)


Number of photon vs Number of photon vs luminosityluminosity

Photon beam spot Number of photon vs time (~ MHz/cm2)

24 m

m

24 mm

Finuda luminosity vs timeOnline Display


Analysis: GEMlumi vs Finuda Analysis: GEMlumi vs Finuda LumiLumi

Data taking of 2007 05 081030 cm-2 s-1

Nhit *10000

Nhit *10000

1030 cm-2 s-1 Finuda Luminosity

GEM Monitor Time(day of May)

Time


Analysis: G3lumi vs Finuda Analysis: G3lumi vs Finuda LumiLumi


Nhit *10000

Nhit *10000

1030 cm-2 s-1




Nhit *10000

Nhit *10000

1030 cm-2 s-1


lumi = 5.8 x 1030


Comparisons between the two luminosity

Finuda lumi =0

time (days of May) lumi (1030)

lumi (1030 cm-2 s-1) GEMlumi Finuda Lumi


Analysis : photon beam profileAnalysis : photon beam profileData taking of 2007-05-09

x position(mm)y position

(mm)

x position(mm)y position

(mm)


Analysis : photon beam Analysis : photon beam positionposition

The monitor has been active for all the last period of Dafne RUNSThis is the photon beam postion during month of May

x position(mm)

y position(mm)

time (days of May)


Bhabha Monitor @ DAFNE UPGBhabha Monitor @ DAFNE UPG

3GEM Luminometersfor Bhabha events

Two tracker luminometers in front of calorimeters realized with GEM technology will be mounted on November 07 in the new interaction region of DANE Upgrade

Siddharta ExpSiddharta Exp

Lumi Calorimeter

e e ++ e e --

e e -- e e ++

Bhabha luminometer


New Gem foil layout New Gem foil layout

A new design of 370x340 mm2 GEM foils have been design to stretch and glue at the same time all three frames (thickness of 3, 2 and 1 mm).


Pads readout and assemblingPads readout and assembling

The pads PCB has been realized with 4 semi rings and 8 phi sectors for a total of 32 channel per detector. The global tracker luminometer foreseen 4 detectors.

The framed GEMs will be assembled using two ALCOAplanes with 6 holes for referencepins insertion

gas inlet

reference holes


Front End ElectronicsFront End Electronics

Each detector is readout with 2 FEE based on Carioca GEM chip directly assembled on the back side of PCB. The Carioca GEM is a modification of Cariocachip developed for the Wire Chambers ofMuon LHCB system readout.

The new electronic card (3x6 cm2) mount2 chips (one per side) for a total of 16 channels (roughly 1 ch/cm2).It foreseen one connector for the analog incoming signal and two connectors for 16 LVDS output signals (one on the upper side and the other one on the lower side)to allow the use for other type of readout.

f.murtas1 lumi gem bremsstrahlung dafne bhabha dafne upgrade

Documents