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CMS HF PMT SYSTEM
ByY. ONEL
U. of Iowa, Iowa City, IAHF-RBX PRR
CERNApr 3-4, 2003
CMS-HF PMT Test and Quality Control System
U. Akgun1, A.S. Ayan1, F. Duru1, E. Gulmez2, M. Miller1, J. Olson1 Y. Onel1, I. Schmidt1
with Quarknet Group – P. Bruecken, C. Like, R. Newland
1 University of Iowa, Iowa City, USA2 Bogazici University, Istanbul, Turkey
AbstractWe have measured the specifications proposed by the CMS-HCAL committee on the candidate phototubes from the three major manufacturers; Hamamatsu, EMI and Photonis. In this report, we present the results from those measurements and we outline the future measurements for the test and the quality control as well as the design of the new University of Iowa PMT test station facility.
Tasks of the Test System
For one tube in every batch:Double-pulse linearity,
Gain vs HV for each batchSingle photoelectron spectrumX-Y scan (spatial uniformity)
Lifetime
For each tube:Pulse width
Pulse rise timeTransit time
Transit time spreadAnode dark current
Relative gain coupled with cathode sensitivity, Pulse linearity
Quality control decision on each tube.
UNIVERSITY of IOWA PMT TEST STATION
LabVIEW software
PMT Timing Data (1900 PMT’s)
PMT Timing Data (1900 PMT’s)
PMT Data (1900 PMT’s)
CA0058 Double Pulse Linearity
Double Pulse Linearity Results on 10 PMTs
Note: Statistical error is %0.9
Single Photoelectron Spectrum at 1100V
Single Photoelectron Spectrum at 1500V
XY Uniformity
Definition of Relative Gain and Gain
Relative Gain (Normalized Output):Anode output of a PMT when exposed to the same
light intensity (±2%) as the Reference PMT and normalized with respect to the output of the Reference PMT
For each PMT, Reference PMT is also tested.
Gain:Anode output current / Cathode output current
Relative Gain vs Gain
Relative Gain vs Gain at 1100V
1000
10000
100000
1000000
40 90 140 190
Relative Gain (%)
Gai
n
CONCLUSION: We can sort pmts w.r.t. their Relative Gain values
Gain vs HV for Relative Gain %50-%70
Gain vs HV for Relative Gain %50 - %70
1000
10000
100000
1000000
10000000
700 900 1100 1300 1500 1700
High Voltage
Gai
n
RG_52.4RG_52.7RG_57.8RG_60RG_65RG_65.295RG_68.7RG_68.7RG_70
Gain vs HV for Relative Gain %70-%80
Gain vs HV for Relative Gain %70-%80
1000
10000
100000
1000000
10000000
700 900 1100 1300 1500 1700
HV
Gai
n
RG_70.877RG_71.5RG_74.353RG_75RG_77RG_77.6RG_78RG_79RG_79.331
Gain vs HV for Relative Gain %80-%90
Gain vs HV for Raleative Gain %80-%90
1000
10000
100000
1000000
10000000
700 900 1100 1300 1500 1700
High Voltage (V)
Gai
n
RG_81.7
RG_82.5
RG_83
RG_83
RG_83
RG_83
RG_83.5
RG_83.7
RG_84
RG_84
RG_84.207
RG_85.468
RG_86
RG_87.5
RG_89.815
Relative QE
This calculation is done on only 120 PMTs @ 1100V
iREF
REFi
REF
iGainOutput
GainOutputQEQE
QE Rel
Note: Gain vs HV tests were done for these 120 PMTs beforehand, so the gains of each PMT is known. Output is Relative Gain values (100 for Ref)
(Output = Gain * QE)
Relative Gain vs Relative QE
Relative Gain vs Relative QE
0
1
2
3
4
5
6
7
8
9
10
40 60 80 100 120 140 160 180 200
Relative Gain
Rel
ativ
e Q
E
Lifetime Measurement Setup
Timing characteristics after 1100 C
0472Pulse Width Rise Time Av. Transit Time Transit Time Spread
Before 3.74ns 2.02ns 15.5ns 0.148nsAfter 3.74ns 2.14ns 15.4ns 0.173ns
0252Pulse Width Rise Time Av. Transit Time Transit Time Spread
Before 4.12ns 1.98ns 15.5ns 0.094nsAfter 3.8ns 2.12ns 15.4ns 0.174ns
After more than 1100 C of charge accumulation: - No change in timing properties.- Gain dropped to %70 of initial value. - Experiment is still on.
PMT Web Database
Sort by column(Ascending or Descending)
Pagination reference for large data sets
Alternating colors to aid readability
More extensive search/sort options are being developed
PMT Web Database
HF PMT Papers
CMS Notes
CMS IN 2002/026 CMS IN 2002/032
CMS Notes
CMS IN 2002/030CMS IN 2002/029
Manufacturer spec Iowa Tests
Window Material Borosilicate glass PASS NA
Eff. Pho.cath. dia. 22-28mm, head-on PASS NA
Quantum efficiency >15% 400-500 nm PASS NA
Photocathode lifetime >200 mC PASS NA
Anode current vs position <+/-20% with 3 mm spot scan PASS PASS
Gain 10^4 to 10^5,10^5 at <0.75 x V ka(max)
PASS PASS
Single pe resolution rms/mean if single pe peak 50% or better
PASS PASS
Pulse linearity +/- 2% for 1-3000 photoelectrons (g=4X10^4)
PASS PASS
Anode pulse rise-time <5ns PASS PASS
Transit time <25 ns preferred PASS PASS
Transit time spread <2 ns preferred PASS PASS
Anode pulse width <15 ns FWHM PASS PASS
Gain (1/2)-lifetime >1500 C PASS NA
Gain recov. (2000pe pulse) within 10% of nominal (g=10^4) in 25 ns
PASS PASS
Average current Ik <1 nA (g=10^4) PASS PASS
Average current Ia <10 microA (g=10^4) PASS PASS
Anode dark current <2 nA (g=10^4) PASS PASS
Stability <+/- 3% within any 48 hr. period PASS NA
Envelope opaque and -HV conductive coating PASS NA