KEK beam test in May KEK beam test in May 2005 2005 Makoto Yoshida Makoto Yoshida Osaka Univ. Osaka Univ. MICE meeting @ Frascati MICE meeting @ Frascati June 27 June 27 th th , 2005 , 2005
Jan 17, 2016
KEK beam test in May KEK beam test in May 20052005
Makoto YoshidaMakoto YoshidaOsaka Univ.Osaka Univ.
MICE meeting @ FrascatiMICE meeting @ FrascatiJune 27June 27thth, 2005, 2005
ContentsContents
KEK beam test (KEK-PS T571)KEK beam test (KEK-PS T571) EquipmentsEquipments SetupSetup
TOF hodoscopesTOF hodoscopes Timing resolutionTiming resolution Operation in magnetic fieldOperation in magnetic field
Aerogel Cherenkov Counter (ACC)Aerogel Cherenkov Counter (ACC) Response for pions, muons and electronsResponse for pions, muons and electrons
Beam surveyBeam survey Focusing magnetsFocusing magnets Lead diffuserLead diffuser Intensity of low momentum muonsIntensity of low momentum muons
KEK-PS T571KEK-PS T571 May 26May 26thth – June 2 – June 2ndnd at KEK-PS at KEK-PS 2 beam line2 beam line Super-conducting solenoidSuper-conducting solenoid
1T magnetic field1T magnetic field 40cm x 40cm TOF hodoscopes40cm x 40cm TOF hodoscopes
// separation by TOF separation by TOF Momentum measurement for low momentum particlesMomentum measurement for low momentum particles
Aerogel Cherenkov counterAerogel Cherenkov counter Refractive index : 1.05Refractive index : 1.05 Discriminate Discriminate ///e by light yield in combination with T/e by light yield in combination with T
OFOF
Q3Q4
D4
SetupSetup
TOF hodoscope
Defining Counters
AerogelT12cm-thickscintillator
Defining counter efficiencyDefining counter efficiency
Good efficiency > 99%
40cm x 40cm
24cm x 24cm
Test for TOF performanceTest for TOF performance
Calibrate TOF counters in 40cm x 40cm Calibrate TOF counters in 40cm x 40cm large arealarge area Diffuser (5cm-t lead block) Diffuser (5cm-t lead block) Negative 3GeV/c (Negative 3GeV/c ()) Solenoid ON/OFFSolenoid ON/OFF
T1 5cm lead block
TOF hodoscope
~30cm
~900cm
Finger counter
Timing resolutionTiming resolutionw/ and w/o magnetic fieldw/ and w/o magnetic field
Solenoid ON
= 77psTOFcounter=65ps
Solenoid OFF
= 80psTOFcounter=68ps
The system can measure time of flight with 80ps resolutioneven in the fringe magnetic field
3GeV/c -
PMT gain variation in magnetic PMT gain variation in magnetic fieldfield
PMT number #1 - #10 for vertical#11 - #20 for horizontal
Rela
tive g
ain
(S
ole
noid
ON
/OFF)
0.91
0.99
0.95
PMTs can work in fringe field with the current setup
ACC performanceACC performance0.425GeV/c Negative
e
Focusing studyFocusing study
x= 11.5y= 10.8
x=11.9y=11.3
x=11.6y=11.0
Q=68Q4=52
Q=117Q4=161
Q=83Q4=73
Modification on focusing magnet current for 0.3GeV/c beam does not affect on beam profile so much
Q3Q4D4
Diffuser studyDiffuser studyMag. ONMag. ON Mag. OFFMag. OFF
Pb: 0Pb: 0 x : 6.6 cmx : 6.6 cmy : 6.4 cmy : 6.4 cm
9.59.5
7.17.1
Pb: 5mmPb: 5mm 10.310.3
9.49.416.316.3
13.813.8
Pb: 10mmPb: 10mm 10.910.9
10.310.318.618.6
14.914.9
Pb: 15mmPb: 15mm 11.611.6
10.710.719.019.0
15.815.8
Pb: 20mmPb: 20mm 11.611.6
10.910.921.821.8
15.815.8
Beam divergence w/o solenoid increase to ~20cm/200cm=100mrad @15mmPb
-0.3GeV/c
Muon yield in low momentum Muon yield in low momentum beambeam
-0.3GeV/c
-0.4GeV/c
5475 16min=6Hz
9000 10min=15Hz
e
TOF measurement by VME TOF measurement by VME TDCTDC
S=180ps
S=150ps
+1GeV/cTOF at center
w/o timewalkcorrection
• CAEN V1290• 25ps resolution• 16 LEMO inputs• multi-hit/multi-event buffer (32k x 32 bit)
VME ADC .vs. TDCVME ADC .vs. TDC
TOF2BTOF2A
Something mis-configuration on the ADC module for TOF counters
• CAEN V792• 12bit resolution• 32 inputs with 2 flat connectors• multi-event buffer (32 events)
Analysis to doAnalysis to do
Extract time resolution on TOFExtract time resolution on TOF Target: 60psTarget: 60ps
70ps resolution of TOF measurement system70ps resolution of TOF measurement system Calibrate light yield in ACCCalibrate light yield in ACC Proper diffuser thickness for autumn beam testProper diffuser thickness for autumn beam test Study on track in magnetic fieldStudy on track in magnetic field
Effect on TOF measurementEffect on TOF measurement Tuning beam parametersTuning beam parameters
FocusingFocusing Muon yieldMuon yield Beam intensityBeam intensity
SummarySummary
Beam test with SC solenoid was performed at KEK-PS Beam test with SC solenoid was performed at KEK-PS 2 beam line during May 262 beam line during May 26thth – June 2 – June 2ndnd
TOF performance was checked in magnetic fieldTOF performance was checked in magnetic field Intrinsic resolution of the counter better then 70psIntrinsic resolution of the counter better then 70ps Resolution of the TOF system ~ 80psResolution of the TOF system ~ 80ps Need more careful offline workNeed more careful offline work
New ACC (refractive index = 1.05) was testedNew ACC (refractive index = 1.05) was tested good performance to discriminate good performance to discriminate ///e at 0.425GeV/c/e at 0.425GeV/c
Beam parameter was surveyed to be optimize for Autumn Beam parameter was surveyed to be optimize for Autumn beam testbeam test
The effect of lead diffuser was measured, will be comparThe effect of lead diffuser was measured, will be compared with simulations. ed with simulations.
VME ADC/TDC modules were tested to take beam dataVME ADC/TDC modules were tested to take beam data
VME ADCVME ADC
TOF2A
TOF2B
mis-configured?
T1R
T1L
Module#1 Module#2