Paul Drumm, MICE Collaboration Meeting Berkeley, 2002

MICE Beam LineOptics & Performance

Paul Drumm, MICE Collaboration Meeting Berkeley, 2002

Performance Requirements

Momentum Range:Muons: 170 – 390 MeV/c(Pions: < 700 MeV/c backwards decay)dp/p ~ 10%

Purity:Clean R() » R() | R(p)

Rates:Few muons per s

Paul Drumm, MICE Collaboration Meeting Berkeley, 2002

Particle Production

Lahet

Production Energy: 600-700-800

Production Angle: 40-30-20

Paul Drumm, MICE Collaboration Meeting Berkeley, 2002

Useful ProductionTarget area illuminated: 2 × 2 mm2

Beam Area : 150mm Ø

Expect : 5×109 protons/cycle on target [cycle=20ms]

[2.5×1013 protons in machine per cycle]

In 1 ms @1.5 MHz 1,500 rotations of machine

proton flux ~10 × + flux ~few × - flux (depends on momentum)

Paul Drumm, MICE Collaboration Meeting Berkeley, 2002

Relative Magnitude – forward particles

1.E-09

1.E-08

1.E-07

1.E-06

1.E-05

1.E-04

1.E-03

1.E-02

0 100 200 300 400 500 600

p

P (MeV/c)

Rel

ativ

e N

umbe

r

Paul Drumm, MICE Collaboration Meeting Berkeley, 2002

Relative Magnitude – 17-23 deg.

P (MeV/c)

Rel

ativ

e N

umbe

r

1.E-09

1.E-08

1.E-07

1.E-06

1.E-05

1.E-04

1.E-03

0 100 200 300 400 500 600

p

Paul Drumm, MICE Collaboration Meeting Berkeley, 2002

Solenoid Beam Line

5T (max) solenoid, 5m long

Paul Drumm, MICE Collaboration Meeting Berkeley, 2002

Proton/Pion Transport

10% p/p

Paul Drumm, MICE Collaboration Meeting Berkeley, 2002

Quadrupole Beam Line

Paul Drumm, MICE Collaboration Meeting Berkeley, 2002

Proton/Pion Transmission

Paul Drumm, MICE Collaboration Meeting Berkeley, 2002

300 MeV/c +

P+ MeV/c

P+ MeV/c

200 MeV/c +

Note: D2 is fixed to the momentum of the muon. The transmission of and is plotted as a fn of the pion momentum selected by D1.

+

+

D1

D2

Solenoid

Relative + (and + bgd) as a fn of the initial and final momentum selection

Paul Drumm, MICE Collaboration Meeting Berkeley, 2002

Relative PerformanceProton (& +) rejection seems complete (~1 in 104)

Performance of Quadrupole Channel Compared to Solenoid:Quads ~ few % cf the Solenoid Channel.

Should be better at higher momentum.

Current estimate of Performance:~ ½ quoted in July (~75/s30-40/s)~ ± 5% dp/p~ better background rejection

Paul Drumm, MICE Collaboration Meeting Berkeley, 2002

Beam Time Structure

~200 ns ~100 ns

~1.5 MHz for ~ 1 or 2 ms

Repeated every 20 ms

Paul Drumm, MICE Collaboration Meeting Berkeley, 2002

Beam Line Components

Quadrupole magnets (2 or more – have several) & Dipole magnets(2) exist

- believed to be ok - currently in use - will be checked & refurbished if needed

New power supplies will be obtained

New stands for elements needed

Vacuum System replaced

Paul Drumm, MICE Collaboration Meeting Berkeley, 2002

Target

Paul Drumm, MICE Collaboration Meeting Berkeley, 2002

Horizontal plane

Proton beam into sheet

Small v angleCompensating twist

Solenoid || to horizontal

Proposal to allow beam height to be increased to >1.4m

Beam Plane

Paul Drumm, MICE Collaboration Meeting Berkeley, 2002

Proton beam

Beam Plane II

Paul Drumm, MICE Collaboration Meeting Berkeley, 2002

Muon Beam Layout

Paul Drumm, MICE Collaboration Meeting Berkeley, 2002

Vacuum & Machine Protection

Muon BeamVacuumSystem

Window & connectionSynchrotron

Paul Drumm, MICE Collaboration Meeting Berkeley, 2002

Vacuum System

gaugecontroller

TP Controller

plc

Dipole DipoleSC solenoid

fastvalve

Scrollpump

330 l/s

turbopump

window

10-6 torr

Paul Drumm, MICE Collaboration Meeting Berkeley, 2002

window

Beam LineISIS MICE

fast valve

Pressurewave

Protection - detonation

Paul Drumm, MICE Collaboration Meeting Berkeley, 2002

Beam Line Control System

PLC

X - Terminal / PC

PSUPSUPSU ModiconConsole

Local

Vac System

Alarms

MCR

Remote

Paul Drumm, MICE Collaboration Meeting Berkeley, 2002

Integration with ISISISIS runs independently of MICE

MICE Target intercepts small area of beam & is thin– allowed to dip into beam – crew control– protection mechanisms

– beam loss monitors– three cycles over the limit

and ISIS stops

Paul Drumm, MICE Collaboration Meeting Berkeley, 2002

Time Line Issues I

• Clear out the hall

• Long shutdown -Decouple existing beam lineCivil Work - door into synchrotronInstall Shielding and Restablish beam line

• Aim to provide a muon beam for 2004/5

Paul Drumm, MICE Collaboration Meeting Berkeley, 2002

Time Line Issues II

• Second Long ShutdownInstall a solenoid Channel to have higher intensity muons

Choice of PSI Solenoid or a copy of the RIKEN solenoid

Paul Drumm, MICE Collaboration Meeting Berkeley, 2002

RIK

EN

Paul Drumm, MICE Collaboration Meeting Berkeley, 2002

Time LineA possible scenario

Muon beam II

Solenoid

Build up

Muon beam I

Installation

prepare

Shutdown

2003 2004 2005

Install