Muon Beam Lines 8/3/06

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Muon Beam Lines 8/3/06

• Want a ? beam of 300MeV/c
• This requires a ? beam of 300 MeV/c
• Possible Sources
• SY
• Proton Beam line components removed.
• Neutrino Beam line components removed.
• Meson
• Meson Test Line
• MIPP Line
• SY 120 Will not transport 8GeV/c protons

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Split between pbar production and SwitchYard
P2,P3 beamlines
Transfer Hall
Switchyard

• SwitchYard 120 Project
• Delivers Main Injector beam to Meson Detector
  Building
• Runs in conjunction with protons delivered to
  pbar source (and eventually NUMI)
• Spills to SY120 can impact pbar production by no
  more than 5

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Scale
6 m

• 2 beam enclosures. Eventually, downstream
  enclosure will be operated independently of
  upstream.
• 6 user stations, with a 7th downstream of the
  beam dump. An experiment can take up more than
  one station.
• 2 climate stabilized huts with air conditioning.
• 2 separate control rooms.
• Outside gas shed inside gas delivery system can
  bring any 2 gases (and exhaust lines) to any of
  the user areas
• Lockable work area for small scale staging or
  repairs.

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Operational Characteristics

• There are several operational modes
• Proton Mode Tune beamline for 120 GeV protons
  that get transmitted through the target. Rates
  at the user area are limited to 1 Mhz. Maximum
  rates so far are 200 KHz.
• Secondary, or Pion Mode Vary the tune of the
  beamline according to the momentum desired.
  Maximum momentum is currently 66 GeV, with rates
  on the order of 10 kHz. Lowest momentum tune is
  on the order of 3-5 GeV. (See graph of
  calculated rates)
• Muons By inserting a beam stop upstream, muons
  of tagged momentum less than 66 GeV can be
  delivered to both areas. By inserting the beam
  stop between the two user areas, muons of
  indeterminate momentum can be delivered to the
  downstream area. The former mode has not been
  tested. The latter mode has delivered 100 Hz of
  muons to the user area.
• Electrons At low momentum (lt 5 GeV), the
  beamline delivers an enhanced electron fraction,
  at very low rates. There are intermediate target
  wheels and sweepers to attempt production of an
  electron beam at higher momentum. This mode has
  not been tested yet.
• Fast extraction delivers from 20-80 buckets of 20
  nsec duration. Each bucket has 500 particles.
  Can insert beamstop to reduce rate to 0.5
  particle/bucket.
• Resonant extraction delivers smooth beam over
  .4 sec spill. Spill can be made shorter down
  to 10 or 20 msec thus making more intense beam.
• Spot sizes can be made as small as 3-5 mm square
  (with 120 GeV protons) and as large as 5 cm
  square.

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Predicted maximum rates in MT6 as a function of
momentum for pions and protons
kHz
GeV
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Status of Fermilab Test Beam

• Several experiments have taken data or are
  currently doing so. Other experiments will be
  installing in the summer.
• 120 Gev, 66 GeV and 33 GeV beams have been
  delivered. Both fast extraction and slow spill
  have been tested.
• A low-rate, broad-band muon beam has been
  established
• Tracking and DAQ near completion
• Either fast spill (0.4-1.6 msec) or slow spill
  (.02-.6 sec)
• Typical operation of 1 spill/minute. Can request
  higher rates.
• 50 K protons/spill at 120 GeV
• 3 K secondary beam/spill at 66 GeV
• Lower momenta will give lower rates
• Muon filters decrease beam by 10-3
• Beam spot sizes of 3 mm square at 120 GeV

Summary of Operational Characteristics
(Beam rates have improved x5 since these
results)
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MIPP- Yields
  Secondary Rates Secondary Rates total
p GeV/c p K pi positives rate
5 1,532.20 327.63 24,007.99 25868
15 16,181.20 4,435.57 71,414.81 92032
25 52,562.76 8,591.27 112,577.65 173732
30 81,580.54 10,434.30 127,705.79 219721
40 166,644.31 12,941.89 139,442.72 319029
50 292,889.28 13,384.52 127,885.23 434159
60 459,856.29 11,917.44 100,943.11 572717
70 652,270.10 9,192.79 68,340.97 729804
80 829,714.68 6,023.75 38,463.27 874202
90 917,282.41 3,163.15 16,675.36 937121
100 809,763.17 1,147.60 4,626.55 815537
110 428,939.55 175.94 447.73 429563
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MIPP- Yields
Secondary Rates Secondary Rates total
p GeV/c p-bar K- pi- negative rate
5 1039.96 231.64 15508.10 16780
15 2216.02 2458.68 52484.63 57159
25 1887.72 3360.74 59668.71 64917
30 1603.29 3401.44 58374.67 63379
40 1016.17 2887.28 51568.62 55472
50 530.56 1964.00 41145.82 43640
60 220.92 1080.32 29050.91 30352
70 69.87 470.93 17620.60 18161
80 15.33 153.13 8754.62 8923
90 1.95 32.49 3247.88 3282
100 0.09 3.27 725.76 729
110 0.00 0.06 48.67 49
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• The size of the beam goes as (120/E)1/2
• For an 8GeV beam the beam size is gt3 times larger
  than the size at 120GeV. (Depends on dp/p)
• Can get an 8GeV beam to the transfer hall but not
  to the Meson Target Train.

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