Beamline-to-MICE Matching Ulisse Bravar University of Oxford 2 August 2004 MICE performance with ideal Gaussian beam JUNE04 beam from ISIS beamline (Kevin.

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Presentation transcript:

Beamline-to-MICE Matching Ulisse Bravar University of Oxford 2 August 2004 MICE performance with ideal Gaussian beam JUNE04 beam from ISIS beamline (Kevin Tilley) Software, beam momentum and coil currents manipulation Results, cooling of the actual ISIS beam

Cooling a Gaussian beam Beam in the middle of the upstream spectrometer:   = 6  mm rad = 200 MeV/c   = 33 cm Gaussian distributions:  x = 3.3 cm  px = 20 MeV/c Coils from Mice Note 49: about 15% cooling LH spectrometers z (m)   (  m rad)

ISIS beam Simulations of the MICE channel performed with ICOOL Beamline designed by Kevin Tilley with TURTLE Latest beam design: JUNE04 Pb diffuser is 8 mm thick Turtle-Icool interface planes: a)Middle of upstream spectrometer b)After Pb diffuser, prior to solenoid c)After Q9, prior to Pb and solenoid Work in progress: a)Interface Turtle-Icool midway between Q6-Q7 b)Simulate the entire beamline with Icool

Beamline layout MICE beamline (NOT TO SCALE !!!) Q7Q8Q9 Quadrupole triplet Drift Pb diffuser 0.8 cm Solenoid & Spectrometer LH Focus coil TURTLE – ICOOL INTERFACES

Beam design concept (1) MICE wants…… x/y x’/y’ 2. Particular input emittance 1. Matched beam …. at matching point (4T Spec Solenoid)

Beam design concept (2) Scheme to provide simultaneously:- This is the driving Design Concept in this design work: To use ‘Beamsize’ & ‘Scatterer thickness’ to provide both beam matching, & required emittance generation. 1. Focus Beam with x/y x’/y’ MICE ACCEPTANCE 2. & Matched after passing thru’ required scatterer [Above figure illustrates case match region immediately follows scatterer]

JUNE04 beam Beam is not cylindrically symmetric at Q9, far from Gaussian… Designed to achieve   = 33 cm and  = 0 in spectrometer solenoid Central momentum of ‘useful’ beam p = 236 MeV/c Design emittance  y ONLY = 6  mm rad This means: ( / mc)  y  y’ sqrt(1-r 2 ) = 6 mm rad

Beam at Q9 (1) p tot (GeV/c)p y (GeV/c)p x (GeV/c) x (m)y (m)

Beam at Q9 (2) Beam is everything but Gaussian Top: x – p z correlation Bottom: a) is not 0 b)p x is asymmetric x (m) p x (GeV/c) p z (GeV/c)

x – p z correlation Correlation after Q9 Disappears after Pb scatterer and inside spectrometer 265 MeV/c x (m) p z (GeV/c)

Cooling (1) Ideal Gaussian beam JUNE04 beam Designed assuming that the optics of the cooling channel were optimised for a central momentum of: = 200 MeV/c Interface Turtle – Icool: centre of upstream solenoid Transmission = 80% COOLING = ??? z (m)   (  m rad)

A few steps MICE channel designed for p central = 200 MeV/c Beam at Q9 designed to provide = 236 MeV/c, due to A 2 – p correlation Steps: Scale ALL coil currents in the MICE channel by 236/207 Include Pb diffuser in Icool Propagate Turtle beam from Q9 into centre of spectrometer Inside upstream spectrometer, select ONLY events with p tot within 5% of 236 MeV/c p tot CUT p tot (GeV/c)

B-field in Icool Fringe field from Q9 not included in Icool simulation B z from solenoid ‘almost’ zero at Q9 Pb scatterer inside fringe field from solenoid B z in solenoid >> 4 T Q9 Pb z (m) B z (T)

Icool vs. Turtle p tot in the centre of the upstream spectrometer: a) Icool b) Turtle Note: Turtle uses thin lens approximation for solenoid fringe field p tot (GeV/c)

Longitudinal momentum JUNE04 beam, all events JUNE04 beam with p tot cut z (m) (GeV/c)

Cooling (2) JUNE04 beam, all events JUNE04 beam with p tot cut z (m)   (  m rad)

Cooling (3) Ideal Gaussian beam  = 15.8% Transmission = 98.6% JUNE04 beam  = 11.1% Transmission = 72.8% 7,075   after Q9 5,412 total   in upstream spectrometer Of these, 1,543   pass the cut on p tot 1,124   left in downstream spectrometer z (m)   (  m rad)

Beta functions Gaussian beam, starting in upstream solenoid JUNE04 beam, all events JUNE04 beam with p tot cut z (m)   (m)

Conclusions MICE coils and JUNE04 beam need some more work We have an actual beam + cooling channel design that works !!! Beamline: a)Reduce central momentum to = 207 MeV/c b)Have central momentum in the centre of the p tot distribution, not in the tail c)More interface planes Turtle-Icool Keep an eye on event rate: 1,124  + / 7,075  + = 15.9% !!!