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Tests and simulations of GEM foils for use in an active target gaseous detector

Snäll, Jacob LU (2016) PHYM01 20152
Department of Physics
Nuclear physics
Abstract
The HIE-ISOLDE post accelerator at CERN has recently come online, en-
abling the use of radioactive ion beams with energies of up to 10 MeV/u. An
active target gaseous detector is under development for use in some of the
experiments. The first investigation of the electron amplification stage with
gas electron multipliers has been performed. To this end, a small prototype
GEM detector was built and tested. The results from these tests are com-
pared with simulations done with the package Garfield++. The gain was
measured for three different gas mixtures of Ar/CO 2 in the ratios 70/30,
76/24, and 82/18. The gain for these cases were ca 1500, 4500, and 15000.
The simulations of the gain for the same gas mixtures gave the result... (More)
The HIE-ISOLDE post accelerator at CERN has recently come online, en-
abling the use of radioactive ion beams with energies of up to 10 MeV/u. An
active target gaseous detector is under development for use in some of the
experiments. The first investigation of the electron amplification stage with
gas electron multipliers has been performed. To this end, a small prototype
GEM detector was built and tested. The results from these tests are com-
pared with simulations done with the package Garfield++. The gain was
measured for three different gas mixtures of Ar/CO 2 in the ratios 70/30,
76/24, and 82/18. The gain for these cases were ca 1500, 4500, and 15000.
The simulations of the gain for the same gas mixtures gave the result 1100,
3000, and 9500. The measurements and the simulations show good agree-
ment, but worse with less quencher in the gas mixture. A charge up test
of the detector was performed resulting in a charge up time of roughly five
hours and a relative gain increase of 1.6. The spread of the electron cloud at
the readout plane was simulated and was in the order of ∼1 mm. Practical
handling routines for changing of GEM foils in the detector in a clean room
were also developed. (Less)
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author
Snäll, Jacob LU
supervisor
organization
course
PHYM01 20152
year
type
H2 - Master's Degree (Two Years)
subject
keywords
GEM, ISOLDE, gas electron multiplier, Garfield++
language
English
id
8834887
date added to LUP
2016-03-18 16:02:08
date last changed
2016-03-18 16:02:08
@misc{8834887,
  abstract     = {The HIE-ISOLDE post accelerator at CERN has recently come online, en-
abling the use of radioactive ion beams with energies of up to 10 MeV/u. An
active target gaseous detector is under development for use in some of the
experiments. The first investigation of the electron amplification stage with
gas electron multipliers has been performed. To this end, a small prototype
GEM detector was built and tested. The results from these tests are com-
pared with simulations done with the package Garfield++. The gain was
measured for three different gas mixtures of Ar/CO 2 in the ratios 70/30,
76/24, and 82/18. The gain for these cases were ca 1500, 4500, and 15000.
The simulations of the gain for the same gas mixtures gave the result 1100,
3000, and 9500. The measurements and the simulations show good agree-
ment, but worse with less quencher in the gas mixture. A charge up test
of the detector was performed resulting in a charge up time of roughly five
hours and a relative gain increase of 1.6. The spread of the electron cloud at
the readout plane was simulated and was in the order of ∼1 mm. Practical
handling routines for changing of GEM foils in the detector in a clean room
were also developed.},
  author       = {Snäll, Jacob},
  keyword      = {GEM,ISOLDE,gas electron multiplier,Garfield++},
  language     = {eng},
  note         = {Student Paper},
  title        = {Tests and simulations of GEM foils for use in an active target gaseous detector},
  year         = {2016},
}