JHFn experiment (Requirements for Electronics)

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JHFn experiment (Requirements for Electronics)
KEK Electronics Wroskhop October 4-5, 2001
T. Nakaya (Kyoto Univ.)

1. Introduction to JHFn
2. Requirement to Front n detectors
3. Example-1 K2K Upgrade Electronics
4. Example-2 Super-K upgrade (FADC)
5. General Comments
6. Summary

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JHF Neutrino Working Group

• ICRR/Tokyo-KEK-Kobe-Kyoto-Tohoku-TRIUMF
• Y. Itow, T. Kajita, K. Kaneyuki, M. Shiozawa, Y.
  Totsuka (ICRR/Tokyo)
• Y. Hayato, T. Ishida, T. Ishii, T. Kobayashi, T.
  Maruyama,
• K. Nakamura, Y. Obayashi, Y. Oyama, M. Sakuda, M.
  Yoshida (KEK)
• S. Aoki, T.Hara, A. Suzuki (Kobe)
• A. Ichikawa, T. Nakaya, K. Nishikawa (Kyoto)
• T. Hasegawa, K. Ishihara, A. Suzuki (Tohoku)
• A.Konaka (TRIUMF, CANADA)

15,5
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1. Introduction to JHFn (Phase-I)

• Neutrino Oscillation (nm?ne ,nm, nt or ns)
• P(nm?nm)1 - sin22q sin2(1.27 Dm2 L/E)
• -- suggested by SK atmospheric neutrino

sin22q
P(nm ? nm )
Dm2
En (GeV)
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JHFn (April, 2007 - )
1GeV n beam
Kamioka
JAERI (Tokaimura)
Super-K 50 kton Water Cherenkov
0.77 MW 50 GeV PS
( conventional n beam)

• Precision measurement of n oscillation
• parameters by nm? nm (sin22q23?Dm232).
• Discovery of nm? ne (sin22q13)
• Confirmation of nm? nt with p0 in Neutral
  Current (NC).

?3 generations
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JHF facility and n beam
JAERI_at_Tokai-mura (60km N.E. of KEK)
Construction 20012006 (approved)
1021POT(130day) 1 year
JHF MINOS K2K
E(GeV) 50 120 12
Int.(1012ppp) 330 40 6
Rate(Hz) 0.29 0.53 0.45
Power(MW) 0.77 0.41 0.0052
FD2 at 2km away
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Principle Goal

• Intense Narrow Band Beam (NBB)
• Beam energy is tuned at the oscillation maximum.
• High sensitivity
• Less background
• 1 GeV beam for good n energy reconstruction.

Sensitivity (Phase-I) d(sin22q23)lt 1
sin22q13 lt 0.6 (90 CL) dDm232 lt
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3,000 n events/yr
(Phase-II w/ Hyper-K) CP study (dlt20)
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2. Requirement to Front n detectors

• Functions of Front n detectors (FD)
• Normalize n flux to Super-K.
• Measure n (nm and ne) spectrum at FD and estimate
  the spectrum at Super-K.
• Study n interactions to estimate BG events to
  Quasi-Elastic (QE) interaction.

Oscillation with sin22q1 and Dm23?10-3eV2
No Oscillation
non QE BG
QE
En (MeV)
En (MeV)
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• A Front n detector
• massive (small n cross section K2K 1ev/kton)
• fine segment or good vertex reconstruction
• good timing (fast spill to reject cosmic ray and
  beam BG)

k2k beam
1msec
8.4m
(scinti. signal)
Background
K2K-1kt Water Tank
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JHF n detectors
n beam
FD2
Super-K
280m
FD1
study of n interaction (1,000n
interactions/ton/day)
2km
spectrum comparison
295km
Network based DAQ for beam-line (at several
stations), FD1 and FD2.
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Front n detectors

• Beam Structure
• 8 bunches in 5.23msec spill (every 3.3 sec)
• ? Depth of the memory 10 msec.
• Timing resolution ltlt 10nsec.
• Water Cherenkov detector (at FD2.)
• One Volume of O(1kton) (? high rate)
• same as Super-K
• Fine segmented detector (at either FD1 or FD2)
• detect low energy particles. (a few cm track)
• many channels (104105 channels)
• Muon detector (at either FD1 or FD2)
• large coverage to measure the profile.
• many channels w/ TDC.

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3. Example-1 K2K Upgrade Electronics
Summer, 2003-
Full active and fine segmented scintillator
(2?2?2cm3) w/ WLS fiber readout MA-PMT
(ADC,TDC)
20,480 channels
m
p
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Electronics schematics
64ch MA-PMT ?320 (20,480ch)
32ch?2 shaper, sample, hold, multiplexed and
analogue readout chips w/ self triggering.
32ch?2
VA/TA
Slave/Master Controlers
CPU
ADC (640 inputs)
CPU
Network
32ch serial line
32ch OR
TDC (640 inputs)
CPU
VME
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controller
ADC
VA TA
ch0 ch1 ch2 ch31
?640
32OR
TDC
trigger (inside)

1. Shaper analogue signals (TA 10 nsec,
   VA500nsec)
2. Trigger by OR of all 32ch (generated by TA)
3. Hold the pulse high of 32 signals (VA)
4. Multiplexed, and readout signals clock by clock
   (VA).

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Spectation
channels 20,480
Nominal signal 10 PE
Max signal 250 PE
Minimum signal 1PE
Single hit rate lt100Hz
ADC 12 (?10) bits
Time resolution 23 nsec
PMT gain 5 ?105
TDC 12 (?10) bits
Time Range 10msec
PEPhoto-Electrons
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4. Example of SK upgrade (FADC)

• Super-K(10,000ch) and K2K-1kt (680ch) use ATM
  modules.

2 parallel channels
A-ch ADC/TDC
Analogue signal
switch to reduce a dead time (300nsec dead time)
B-ch ADC/TDC
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FADC

• 500MHz FADC for PMT sum is used at K2K 1kt Water
  Cherenkov detector.
• To identify multiple interactions
  (0.5events/spill), which do not happen at
  Super-K.
• Super-K is also planned to install the newly
  developed 500MHz FADC (1000 channels for 10,000
  PMTs).
• The similar FADC will be used at the new Water
  Cherenkov detector at JHFn.

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5. General Comments

• In JHFn experiment, we need inexpensive and
  compact electronics.
• MA-PMT lt 2,500/ch ?note
• We do not need a PIPE-LINE DAQ, but need a Buffer
  memory (spill is every 23 sec.).
• FADC is one of good candidates, though it is
  still expensive to be used for all channels.
• An Analogue ASIC such as VA/TA is desired to be
  used at the front-end of MA-PMT.
• We may also need an inexpensive TDC system such
  as TMC for Muon chamber.

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6. Summary

• JHFn experiment will start in 2007 at the same
  time when JHF accelerator complete.
• Discovery of nm?ne.
• Precision measurement on the n sector ( level).
  
• CP violation search in n oscillation w/ Hyper-K.
• The new Narrow-Band n beam line, the first front
  detector at JAERI and the second front detector
  at 2km away from the target will be constructed.

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• FADC will be developed for the new Water
  Cherenkov detector.
• Inexpensive multi-channel electronics will be
  developed for the fine grained detector.
• Milestone
• SK 500 MHz FADC (1,000ch) 2002
• K2K upgrade electronics (20,000ch) 2003
• JHFn 2006
• Definitely we need a support from KEK electronics
  group and cooperation.