E949 CsI endcaps Steve Kettell , BNL January 27 th , 2006 PIENU Collaboration Meeting
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1 PIENU Collaboration Meeting 1/26/06 E949 CsI endcaps Steve Kettell , BNL January 27 th , 2006 PIENU Collaboration Meeting
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E949 CsI endcaps Steve Kettell , BNL January 27 th , 2006 PIENU Collaboration Meeting. Undoped CsI. r = 4.5 g/cm 3 c 0 = 1.86 cm R M = 3.8 cm Fast: ~45ns @ 310nm; Slow: ~600ns @ 450nm F/T ~80% with ~200 p.e./MeV for 5” Quanticon PMT - PowerPoint PPT Presentation
Transcript of E949 CsI endcaps Steve Kettell , BNL January 27 th , 2006 PIENU Collaboration Meeting
1 PIENU Collaboration Meeting 1/26/06
E949 CsI endcaps
Steve Kettell , BNL January 27th, 2006
PIENU Collaboration Meeting
PIENU Collaboration Meeting 1/26/06 Steve Kettell, BNL2
Undoped CsI
= 4.5 g/cm3
0 = 1.86 cm
RM = 3.8 cm
Fast: ~45ns @ 310nm; Slow: ~600ns @ 450nm F/T ~80% with ~200 p.e./MeV for 5” Quanticon
PMT With U330 filter and 3” High Field PMT get
F/T~86% and ~50p.e./MeV on bench
PIENU Collaboration Meeting 1/26/06 Steve Kettell, BNL3
E949 Detector Overview
CsI Endcaps
E949
PIENU
PIENU Collaboration Meeting 1/26/06 Steve Kettell, BNL4
End View
PIENU Collaboration Meeting 1/26/06 Steve Kettell, BNL5
More detail
Upstream ECOD Ring4: 43.4ID Ring3: 25.5
Downstream EC
OD Ring4: 41.5
ID Ring3: 23.6
2x23.6=47.1cm isreasonably well matched to TINA’s46cm diameter
PIENU Collaboration Meeting 1/26/06 Steve Kettell, BNL6
Assembly View
PIENU Collaboration Meeting 1/26/06 Steve Kettell, BNL7
Xtal
Ring 1 Ring 2-4A: 7.8-8.0 9.9-11.2B: 6.1 8.6C: 25.0 25.0All dimensions in cm
PIENU Collaboration Meeting 1/26/06 Steve Kettell, BNL8
PMT and Mount
Hamamatsu High-Field PMTsR5065mod (R4721mod) are fast, UV-glass, good QE~17%, but poor spe resolution
PIENU Collaboration Meeting 1/26/06 Steve Kettell, BNL9
Possible Schedule
Optimistic: both endcaps removed by 3/31/06 Less optimistic: remove upstream mid-March
and downstream by end of April
Allow 2 weeks to uncouple EC’s from iron? Do we remove xtals from EC? 2 weeks (PMT&xtals)?
60 tech-days? Packing and shipping…
Sam Aronson endorsed and forwarded the following to DOE:“…Some components (endcap vetos) will be lent to TRIUMF before they are sent to Japan. These will be used in a +e+ experiment. The need for these components is for 2-3 years, starting in April 2006, after which they will be shipped to Japan.”
PIENU Collaboration Meeting 1/26/06 Steve Kettell, BNL10
Backup
PIENU Collaboration Meeting 1/26/06 Steve Kettell, BNL11
PIENU Collaboration Meeting 1/26/06 Steve Kettell, BNL12
PIENU Collaboration Meeting 1/26/06 Steve Kettell, BNL13
Fig :Radiation Length vs polar angle
(polar angle)
E787
BVL
)cos(
Rad
iatio
n le
ngth
E949
45 degree hole
Photon Veto
rejection π0
• Rejection of K background as a function of acceptance for E787 and E949.• 2 better rejection at nominal acceptance (80%)
γNew detectors in blue.
E949
E787
