PMT Delivery

1
PMT Delivery

• We have received 1850 PMTs
• We have tested fully 1550 and are now in our
  database
• We have only rejected 15 of 1550
• 115 PMTs were sent to the HF test beam
• All data is on database, it will be available on
  internet-web when the security problems are
  resolved.

2
Quartz Fibers Delivery

• We have initially purchased 995 Km of QP fiber
• We have put in a change order for an additional
  120 Km of fiber
• We have therefore ordered 1,115 Km of fiber in
  total
• 1st delivery 18,865 m on 1/30/022nd delivery
  67,423 m on 2/27/023rd delivery 94,991 m on
  3/27-28/024th delivery 80,849 m on 4/24/025th
  delivery 101,328 m on 5/30/026th delivery 94,630
  m on 6/25/027th delivery 59,013 m on 7/15/028th
  delivery 109,822 m on 8/27/029th delivery 72,561
  m on 9/30/0210th delivery 40,848 m on 10/31/02
• Total 742,875 m (about 65 of total delivery)
• Delivery means ? they are delivered to Bld
  186/CERN

3
HF status

• Project
• Construction status
• Test beam
• Schedule

4
Strongback and backplane production

• Contract signed with Turkish firm in December
  2001.
• First 9 strongbacks and 6 backplanes delivered
  geometry verified by mounting the first 9 wedges
  on a jig simulatingthe geometry of final
  shield.
• Expect complete delivery
• December 2002

5
Read Out / Optics
2 boxes built plan to use them in Test beam
PM Base Sockets (Iowa)
Light Guides (Iowa)
Mu-Metal (Iowa)
6
Fiber stuffing
New Task for Iowa Ianos Schmidt (CMS Fiber
Insertion Coordinator)
Source tubes insertion
Fiber bundles preparation
7
Source Tube Assembly
8
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, USA 2 Bogazici
University, Istanbul, Turkey
Abstract We 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.
9
Tasks of the Test System

• For one tube in every batch
• Double-pulse linearity,
• Gain vs HV for each batch
• Single photoelectron spectrum
• X-Y scan (spatial uniformity)
• Lifetime
•  
• For each tube
• Pulse width
• Pulse rise time
• Transit time
• Transit time spread
• Anode dark current
• Relative gain coupled with cathode sensitivity,
• Pulse linearity
• Quality control decision on each tube.

10
Iowa PMT Timing Test Setup
11
Light source through Fiber for Light guide test
12
Light source through Fiber for Light guide test
13
UNIVERSITY of IOWA PMT TEST STATION
14
XY Uniformity
XY Uniformity, Dark Current, Relative Gain
8 channel pico-ammeter
Pinhole Mask
32 channel Voltage ADC
Motor Controller
15
Single Photoelectron Setup(fourth generation)
16
LabVIEW software
17
PMT Timing Data (1550 PMTs)
18
PMT Timing Data (1550 PMTs)
19
PMT Data (1550 PMTs)
20
CA0058 Double Pulse Linearity
21
Single Photoelectron Spectrum at 1100V
22
PMT Web Database
Sort by column (Ascending or Descending)
Alternating colors to aid readability
Pagination reference for large data sets
More extensive search/sort options are being
developed
23
PMT Base Comparison
Cockroft-Walton Base
Hamamatsus Resistive Base
Parallel-Dynode Bases
24
Iowa LED Pulser Characteristics

• Pulser located at LED
• Pulser operates from 5.5 Volts and ground
• Output pulse of 5.5 Volts
• Circuit utilizes all bipolar devices
• Rise and fall times less than 6 nanoseconds
• Electrical pulse duration from 10 nanoseconds to
  1 microsecond
• Circuit may be easily modified to drive multiple
  LEDs to achieve greater optical signal
• Signal amplitude is adjusted by varying LED
  cathode potential

25
Comparison of VME Based Pulser and Unit Located
at LED
Comparison of VME Based Pulser and Unit Located
at LED  
VME Based System             System has greater
voltage range due to FET output device o     
Output is adjustable from under five
volts to more than 15 volts         Minimum
pulse width is less than 10 nanoseconds and is
limited by the response of the LED         Rise
and fall times are less than 3 nanoseconds       
  Four pulsers or more are mounted on a single
card         Requires coaxial cable for
LED o      Some concern about signal reflection
this has not been observed in prototype units
Pulser at LED             Pulser is designed
with bipolar technology no FETs o     
Able to withstand higher levels of
radiation         Minimum pulse width is less
than 10 nanoseconds         Rise and fall times
are less than 5 nanoseconds         Voltage
output limited to a maximum of 15 volts        
Requires a minimum of 5 VDC May be increased to
15 VDC         No worry of reflections on a
coaxial line
                         
26
Pulser in Calibration Unit
27
Pulser Cards
28
Test of CMS_HF Light Guide System at Iowa PMT
Test Station

• A. Ayan, U. Akgun, E. Gulmez, A.
  Mestvirishvili, M. Miller, J. Olson, Y. Onel,
  I. Schmidt
• University of Iowa, Iowa City, Iowa, USA
• Bogazici University, Istanbul, Turkey

29
Light Guide Test Setup
30
Light Guide Milling
31
Light Guide Tests

• Purpose
• Test the effect of the light guides on the
  uniformity of the PMT Signal by measuring the X-Y
  uniformity and attenuationOptical properties
  mixing
• Comparison of the tapered light guides vs.
  non-tapered ones.
• Comparison of the different types of reflective
  materials (HEM, Mylar)
• Used the same light guides and reflective
  materials (HEM, Mylar) as in the test beam

32
HF Wedge Test Beam 2002 Iowa Analysis

• Ahmet Sedat Ayan
• University of Iowa
• Dept. of Physics Astronomy

33
Test beam setup
Iron shield
Two HF wedges Four data taking conditions-Perpen
dicular to beam-Inclined by 6o
horizontally-Inclined by 4o vertically-Modules
turned by 90 degrees to scan along the side
Muon tagger
Delay Wire Chambers Resolution 200 mm
Trigger counters
34
Test beam

• Two wedges assembly (H2 beam)

35
Electromagnetic energy resolution by positrons
after light-guide intervention

• The installed light guide reflector elongated by
  15mm.
• The the constant term of electromagnetic
  resolution improves to 188. !!!

36
Scan by 50GeV electrons

• T15, EM fibers.
• Beam particle hit position cut by 0.25x0.25mm
  squares.

37
6 degrees tilt

• EM fiber locations not visible with 6 degrees
  tilt.
• run00097.root

38
Electromagnetic energy resolution by electrons

• Response of EM fibers _at_ T15
• If only electrons used,
• a2.77
• b0.11

39
Response linearity to electrons

• Response linearity of T15, EM fibers is within
  2.3
• Problem with 100GeV electron run. (as mentioned
  before).

40
Hadronic energy resolution by pions

• T15, EM fibers.
• Gaussian fit to signal
• Used sigma (?) and mean ?(E) of fit.
• ?/E20

41
HF READOUT BOX OPTICS DESIGN
42
Source calibration
New Task for Iowa Ianos Schmidt (Source System
Coordinator) Source calibration successfully
implemented in parallel to test beam exposure
both wedges in H2 have been systematically
sourced. A 3 mCurie Co60 source is pushed into
source tubes ( at least one per tower) and
current drawn by PMTs is measured by Iowa
electrometer (Mike Miller). The results are
compared to the longitudinal scan done with the
100 Gev electron beam.
Under fiber bundles
Inside Backplane
Current ( arb units)
Under PMT
Inside absorber
Source pos.
43
Induced luminescence studies
At Cern HF quartz fibres have been irradiated
in 24 GeV/c proton beam (PS) September
2002 0.5 GeV/c electron beam (LIL) August 2001
Iowa-Turkish GroupsK. Cankoçak, I. Dumanoglu,
A. Esendemir, J.P. Merlo, I. Schmidt
k of Cerenkov ligth is emitted in the backward
direction ( k
20 _at_ NIM A 399 (1997) 202-226, with electrons
parallel to the fibres ) Forward
F(l) e(l) IC(l) IL (1k) Backward
B(l) e(l) IC(l) k IL(1k)
proton hadronic shower at 10 cm depth 10 deg from
beam
44
Luminescence
Before Irradiation
after 4.6x1014 protons
FWD light
BWD light
Evidence for luminescence increase with radiation
(already seen last year with irradiation in 500
MeV electron beam) Working on interpretation and
estimation of induced background light during LHC
operation
45
HCAL - ? Coverage
(A.Nikitenko)
HF needed for tag jets, missing ET and jet vetoes
(SUSY)
46
Quarknet 2002

• Iowa hosted a summer institute for high school
  teachers in July
• 28 high school teacher participation
• (3 week session)
• CMS summer research
• Peter Bruecken Bettendorf High teacher
• Ben Bettendorf High student
• Aaron Sartor Bettendorf High student
• Beth Takamoto Bettendorf High student

47
Quarknet 2002 CMS Summer Research
48
Schedule
Conclusion HF is well on schedule and stays
clear of CMS critical path