4 th workshop on nbi, 7-11 november 2003valeri falaleev(cern) & yuri sviridov (ihep, protvino)...
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![Page 1: 4 th workshop on NBI, 7-11 November 2003Valeri Falaleev(CERN) & Yuri Sviridov (IHEP, Protvino) Use of multi wires chambers in air for profile measurements](https://reader036.vdocuments.us/reader036/viewer/2022062517/56649f145503460f94c284f5/html5/thumbnails/1.jpg)
4th workshop on NBI, 7-11 November 2003 Valeri Falaleev(CERN) & Yuri Sviridov (IHEP, Protvino)
Use of multi wires chambers in air for profile measurements of intensive beams
at IHEP (Protvino)
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4th workshop on NBI, 7-11 November 2003 Valeri Falaleev(CERN) & Yuri Sviridov (IHEP, Protvino) 2
Years Proton beam
Neutrino beams
Detector(s) Results
1974 -1982
Up to 2x1012, 30 bunches, 5s spill duration
, anti-
focused beam;beam-dump
ITEP Spark Neutrino Detector
1. -pairs in -interactions;2. search for short-lived particles using nuclear emulsion; 3. tot(N), quasi-elastic scattering,
including limits on -oscillation
parameters, e-scattering, etc.
4. prompt neutrinos (charm production in pFe-interactions)
1985-2003
Up to 1.4x1013 (booster), 29 bunches, 5s spill duration
, anti-
focused beam;beam-dump; short decay path
SKAT Bubble Chamber (up to 1990); JINR-IHEP Neutrino Calorimeter
1. (anti-)-inclusive scattering, structure functions, e-
universality, exclusive channels2. prompt neutrinos3. e-oscillations with Neutrino Calorimeter
Neutrino beams at IHEP
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4th workshop on NBI, 7-11 November 2003 Valeri Falaleev(CERN) & Yuri Sviridov (IHEP, Protvino) 3
Construction
116 wires
1
2
15
16
VbiasVbias
116 wires
1
2
15
16
Y p
rofile
Beam
3 mm
Vbias
a b c d
1 16
X profile
12
0m
m
15
6m
m
element a and d element b
Mechanical construction of chamber (type A)
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4th workshop on NBI, 7-11 November 2003 Valeri Falaleev(CERN) & Yuri Sviridov (IHEP, Protvino) 4
Construction - 2
Chamber A Chamber B
Signal electrode
Construction 14 central + 2x12 wires connected in parallel, 38mm working area
16 strips, 140mm working area
Material beryllium-bronze alloy aluminum
Size wire of 200 40 x 8mm
Distancebetween wires/strips
0.8mm 1mm
Bias plane 116 wires, 1mm step, beryllium-bronze alloy
116 wires, 1mm step, beryllium-bronze alloy
Distance between signal and bias plane 3mm 3mm
Main parameters of chamber A and B
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4th workshop on NBI, 7-11 November 2003 Valeri Falaleev(CERN) & Yuri Sviridov (IHEP, Protvino) 5
Electronics
ADC +
memory
chamber20m
Schematic drawing
Timing diagram
100s
beam
digitalization
5s 5-10s 5sTime
Signal
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4th workshop on NBI, 7-11 November 2003 Valeri Falaleev(CERN) & Yuri Sviridov (IHEP, Protvino) 6
Measurements (vacuum)
Originally the chambers were used inside of beam pipe under a pressure of ~10-2 torr
Beam profile for focused (chamber A) and wide beam (chamber B)
Channel number
Channel number
16 mm 140 mm
Beam profilesChamber A Chamber B
Number of -electronsNumber of -electrons per proton (measured with Vbias=0):chamber A – 0.03, chamber B – 0.01
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4th workshop on NBI, 7-11 November 2003 Valeri Falaleev(CERN) & Yuri Sviridov (IHEP, Protvino) 7
Measurements (vacuum) - 2
Chamber signal,relative units
1.0•1013
Beam intensity,protons/cm2
Chamber A
Linearity
spill duration varied from 20 ns to 5s
chamber signal is a sum of 14 central wires signals
intensity measured by BCT
Vbias= 0
the same dependency was observed for chamber B too
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4th workshop on NBI, 7-11 November 2003 Valeri Falaleev(CERN) & Yuri Sviridov (IHEP, Protvino) 8
Measurements (vacuum) - 3
Dependence of signal on pressure and bias voltage
chamber signal is a sum of all wires signals
Bias voltage, V
Chamber signal,relative units P ~ 1 Torr
P ~ 2x10-1 Torr
P ~ 5x10-2 Torr
P ~ 5x10-3 Torr
for Vbias=0 the signal is equal for all pressures
after first 1-2 years of use all chambers were operated with Vbias=0
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4th workshop on NBI, 7-11 November 2003 Valeri Falaleev(CERN) & Yuri Sviridov (IHEP, Protvino) 9
The chambers in air
Focused neutrino beam
target
beam~5m ~5-7m
chamber
1985 - 1994
beam-pipe
Short decay path beam
target absorberchamber
beam-pipe
~10m
~ 1996beam
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4th workshop on NBI, 7-11 November 2003 Valeri Falaleev(CERN) & Yuri Sviridov (IHEP, Protvino) 10
Measurements (air)
Linearity
Proton intensity in 1012 protons per spill (5s)
Proton intensity in 1012 protons per spill (5s)
Chamber signal,relative units
Chamber signal,relative units
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4th workshop on NBI, 7-11 November 2003 Valeri Falaleev(CERN) & Yuri Sviridov (IHEP, Protvino) 11
Summary
The multi wires chambers were usefully used during many years in vacuum and air for profile measurements of intensive proton beams.