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The H2 VLE Beam Status report The H2 VLE Beam Status report

The H2 VLE Beam Status report - PowerPoint Presentation

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The H2 VLE Beam Status report - PPT Presentation

NCharitonidis and YKaryotakis June 1st 2016 1 taking over the initial work from Ilias Efthymiopoulos H2VLE Beam Layout is final 2 Tilted Dipoles 35 degrees wrt xplane ID: 694149

amp beam energy target beam amp target energy kaons wa105 protons pions bars vle energies t22 background content list

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Slide1

The H2 VLE BeamStatus report

N.Charitonidis and Y.Karyotakis (*)June 1st 2016

1

(*) taking over the initial work from Ilias EfthymiopoulosSlide2

H2-VLE Beam Layout is final 2

Tilted Dipoles (~35 degrees wrt

x-plane)

WA105

Secondary dump

Courtesy:

S.Girod

, V.

Clerc

GEANT4 modelSlide3

H2-VLE beam line is finalized !

3Slide4

Simulation studiesGEANT4 based package (G4BeamLine)

Full simulation of H2 beam line transport + sec. target + VLE extensionWe generate 1M events per energy (5x27 hours on LAPP Tier2 per energy point ! Massive MC production)Physics lists studyBeam transmission studiesBeam Composition studiesTarget Optimization studiesMuon background studies

4Slide5

H2-VLE Beam

Secondary beam +80GeV/c (70% p, 25%p, 5% K on T22 Cu (30cm long and 3cm diameter))

Total beam line length after the target: L=39.644mBeam angles

a

x

= 11deg (horizontal plane)

a

y

=

,

7.7deg (vertical plane) assuming the target position at zero.Kaons and

pions decay soon/later before WA105 depending on their energy.In principle very low anti-proton production25%p, 5% K on T22 Cu (30cm) ta

WA105

WA105

5

T22

z

y

xSlide6

Beam composition at the entrance of WA105

Selecting Negative beam

Selecting positive beam

Electrons dominate at low energies

6

*

*

m

and positive particles are also producedSlide7

7Slide8

Simulated beam composition depends on Physics List !

In principle the list FTFP_BERT is recommended at low energies (<10GeV)

pion content

8Slide9

Proton content @ WA105

Anti-proton production is suppressed (FTFP_BERT) at low energies.9Slide10

Kaon content@ WA105

10Slide11

Muons in the beam pipe< 6%

11Slide12

Absolute Rates

The rate is adjustable by modifying the secondary beam intensity and / or collimating the beam

12

100 Hz trigger rate is easily achievableSlide13

Target optimisation

Target material = Cu

At high energy the content is almost independent from the target length

At low energy e+/e- are absorbed by using high Z targets and

p

’s production is enhanced

13

Target length = 15cmSlide14

Muon Background

Energy versus x

Energy versus y

Energy = +12 GeV

All muons in

LAr

considered

For 10

6

particles on T22, we find

+12GeV/-12GeV 11380/10896

m or ~2.5 KHzLow momentum (2GeV) must be cut from existing walls

14Slide15

Muon Background (2)

If the cryostat is moved higher by delta height, the muon background increases, a factor ~2 after dh = +500mm

15

Lateral shielding can easily be added before the bending magnetsSlide16

Material Budget

@ 1 bar

@ 1 bar

16Slide17

Data

taking durationUsing the less optimistic list FTFP_BERT and 30 cm Cu target

17

With W target significant reduction !Slide18

5402 mm

Z

Y

5402mm-817mm(=8548*cos(45

0

) * tan(7.7

0

) )= 4585 mm

4078 mm

Beam Position today

Bottom membrane

Beam

a

=7.7

o

18Slide19

Beam Instrumentation

Purpose :Provide triggerScintillator tilesBeam profile and momentum measurement event by event200 x 200 mm layers of fibers 0.5 mm combined with scintillator tilesPID2 Cherenkovs

at 15 barsTOF maybe

Space for instrumentation is very tight, close collaboration with the EN/EA and BE/BI people, non CERN equipment difficult to integrate

19Slide20

PID :2

Cherenkovs are enoughEverywhere more than 10 pe

Two meters long

Have to run @ 15bars

20Slide21

Two Threshold Cherenkov counters for complete PIDFreon 12

colorless, odorless, tasteless, nontoxic, and nonflammable21

Momentum Range

[GeV/c]

Particle

ID method

Info

0.4-0.8

Pions

No

Kaons or protons

?

Kaons

Protons

0.8-3.0

Pions

C1

C1 @ 15 bars

Freon

12, C2

empty

Kaons

No Kaons

Protons

No C1

3.0 – 5.0

Pions

C1 & C2

C1 @ 1.8 bars C2

@ 15 bars

Kaons

No C1 & C2

Protons

No C1 & No C2

5.0 - 8

Pions

C1 & C2

C1

@ 1 bar C2 @ 4.0 bars

Kaons

No C1 & C2

Protons

No C1 & No C2

8-12

Pions

C1 & No C2

C1

@ 1 bar C2 @ 1.8 bars

Kaons

No C1

&

C2

Protons

No C1 & No C2Slide22

L=31m

L=18m

TOF for p

/ p separation at low energies

Moderate TOF resolution needed ~1.5 ns

Electron pion separation with TOF at low energies

Need a 100ps resolution to tag e/

p

up to 2GeV/c

22Slide23

SummaryExtensive simulations finished for H2 and well advanced for H4

Physics list studyTarget optimizationBackground (muons)Momentum measurement (To be done)Material budget optimization in progress

Regular meetings with CERN instrumentation group (BE/BI) and joint ptotoDUNEs Beam group.

Need 2

Cherenkovs

at high (15 bars) pressure from CERN. On going discussions. Need decision before end of July

Detailed technical note under preparation due before June 16

th

2016

23