Implications of Wrap-Around for TGax Scenarios
Intense muon beams for Higgs studies
The
ESSµSB project
is based on the production, accumulation
and cooling for a future facility
of intense muon beams
to study
the Higgs related scalar sector.
A practical
Higgs
factory as a next facility consists of
a high-intensity H
-
source feeding p-compressor rings;
a p
–
decay channel at a optimal muon momentum
compression to about 220 MeV/c;
a robust
±
ionization–cooling system, compressing the
bunches in 6D;
a fast recirculating LINAC acceleration system to bring
muons to the required energy where collisions are recorded;.
a L ≈ 10
32
cm
-2
s
-1
collider ring at the Higgs mass and a
L ≈ 10
34
cm
-2
s
-1
collider in the sub-TeV range.
The large ESS proton intensity is directly related to the
relatively short muon lifetime
ESS March 2, 2020
Slide# : 1
ESS production at 2.0 GeV
A GEANT4 simulation has been used for charged pion and kaon
in a mercury target at the kinetic energy of 2.0 GeV.
The 3.3 x 10
14
p/pulse generate 3.85 x 10
13
π+/pulse and 2.64 x
10
13
π-/pulse in the forward direction with respect to the beam
and a transverse momentum at production < 250 MeV/c. The
peak of the momentum distributions is at about 120 MeV/c.
.
Uppsala_Feb_2016
Slide# : 2
The π are decaying with
a
mean lifetime of ct = 7.8 m,
corresponding to path of
8.94 m at the most probable
momentum of 160 MeV/c
The µ have ct = 659.1 m, and
the longer decay length of
1370 m at 220 MeV/c
The proton rings
The rate of the ESS- LINAC may be doubled to 28 Hz.
Two proton rings of 35 m radius, the
“Accumulator”
collects the
LINAC pulse and the
“Compressor”
steers the bunch to 1.5 ns.
The beam transfer from the LINAC to the Accumulator is
performed by a multi-turn injection of negative [p+2e-] ions,
stripped at the entrance of the Accumulator ring, either with a
thin absorbing carbon foil or of an appropriate LASER beam.
VeniceF, March 2019
Slide# : 3
The pion spectrum produced by
a given “proton power” (the
number of protons inversely
proportional to its energy) is
nearly independent of proton
kinetic energy between 8 and
20 GeV and a only a factor two
lower for 2 GeV
.
Yield (π/p/sr/GeV/GeV)
P. Sala: prediction
ESS March 2, 2020
Slide# : 4
Rings have 35 m radius, wth 4 pulses
of 120 ns each separated by 50 ns
.
Accumilator and compressor rings for H-
In order to make use of a 5
MWatt/pulse from the ESS and
the requirement of 1.5 ns long
proton pulses, 2 coupled rings
(Accumulator and Compressor)
may subdivide the beam pulse
into four pulses and operate the
secondary beam at 4 x 14 = 56
Hz and a 17.8 ms bunch rate.
Investigating the use of Wrap-Around in TGax scenarios 3 and 4, highlighting simulation studies showing differences in system performance and the need to reconsider simulation parameters. Reviewing hexagonal BSS layouts and proposing solutions for refining deployment simulations.
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Presentation Transcript
Intense muon beams for Higgs studies The ESS SB project is based on the production, accumulation and cooling for a future facility of intense muon beams to study the Higgs related scalar sector. A practical + Higgs factory as a next facility consists of a high-intensity H-source feeding p-compressor rings; a p decay channel at a optimal muon momentum compression to about 220 MeV/c; a robust ionization cooling system, compressing the bunches in 6D; a fast recirculating LINAC acceleration system to bring muons to the required energy where collisions are recorded;. a L 1032cm-2s-1 + + collider ring at the Higgs mass and a L 1034cm-2s-1 + + collider in the sub-TeV range. The large ESS proton intensity is directly related to the relatively short muon lifetime ESS March 2, 2020 Slide# : 1
ESS production at 2.0 GeV A GEANT4 simulation has been used for charged pion and kaon in a mercury target at the kinetic energy of 2.0 GeV. The 3.3 x 1014 p/pulse generate 3.85 x 1013 +/pulse and 2.64 x 1013 -/pulse in the forward direction with respect to the beam and a transverse momentum at production < 250 MeV/c. The peak of the momentum distributions is at about 120 MeV/c. . The are decaying with a mean lifetime of ct = 7.8 m, corresponding to path of 8.94 m at the most probable momentum of 160 MeV/c The have ct = 659.1 m, and the longer decay length of 1370 m at 220 MeV/c Uppsala_Feb_2016 Slide# : 2
The proton rings The rate of the ESS- LINAC may be doubled to 28 Hz. Two proton rings of 35 m radius, the Accumulator collects the LINAC pulse and the Compressor steers the bunch to 1.5 ns. The beam transfer from the LINAC to the Accumulator is performed by a multi-turn injection of negative [p+2e-] ions, stripped at the entrance of the Accumulator ring, either with a thin absorbing carbon foil or of an appropriate LASER beam. The pion spectrum produced by a given proton power (the number of protons inversely proportional to its energy) is nearly independent of proton kinetic energy between 8 and 20 GeV and a only a factor two lower for 2 GeV. P. Sala: prediction Yield ( /p/sr/GeV/GeV) Pion momentum 300 MeV/c VeniceF, March 2019 Slide# : 3
Accumilator and compressor rings for H- In order to make use of a 5 MWatt/pulse from the ESS and the requirement of 1.5 ns long proton pulses, 2 coupled rings (Accumulator and Compressor) may subdivide the beam pulse into four pulses and operate the secondary beam at 4 x 14 = 56 Hz and a 17.8 ms bunch rate. Rings have 35 m radius, wth 4 pulses of 120 ns each separated by 50 ns. ESS March 2, 2020 Slide# : 4
