27/6/05 Frascati 1

M. Bonesini INFN Milano

MICE TOF stationsupdates

27/6/05 Frascati 2

Preliminary considerationsBackground: MICE for INFN is on track

approval, this means that we have got funds for TOF0 prototypes, EMCAL prototypes now only for 2006 (~310 KE on a 415 KE request)

In practice: funds are for specific items, they are not an experiment budget: ie I cannot easily move from one item to the other (eg from PMTs to trigger modules)

Funds cover all TOF0 items up to cable: eg no electronics& calibration system, but counters, mechanics, pmts

A serious final planning cannot be done now

27/6/05 Frascati 3

Aim of TOF stations

• TOF0 experiment trigger

•TOF0/TOF1 PID on incoming muons

•TOF1/TOF2 PID on particle traversing the cooling channel

•Requirements:

oSingle detector resolution ~60 ps

oHigh rate capability

oSustain nearby B fringe fields

This has been questioned by INFN referees, so simulation work

is needed on this corner

27/6/05 Frascati 4

Short term planning

The idea is to freeze the design of TOF0 by November (PMTS+ scint counters): some money has to be spent by end 2005, if not it will evaporateTests are under way for PMTs (choice of partition chain) and Scintillator type (cosmics)BUT I need urgently some inputs, if NOT I have to assume OLD numbers maybe wrong

27/6/05 Frascati 5

TOF0 simulation in my hand

With 4 cm width slabs max counter rate seems < 400-500 KHz. R4998 maybe OK with booster

or active divider circuit (studies under way)

27/6/05 Frascati 6

What is needed

If NEW beam (Aug 05) I need 1. X,Y beam profiles at TOF0 as rates/cm2

(Hz/cm2) 2. A table with rates/cm2 x,y with step of 1

cm2

To decide the geometrical size of TOF0

( present dimensions 48 x 4 x 2.5 cm3

for 12 counters/plane)

27/6/05 Frascati 7

B field

current assumption for TOF0, validated recently by a mail by Kevin, B is well below 50 gauss I need the B field components along the PMT axis and orthogonal to the PMT axis

27/6/05 Frascati 8

For TOF1/TOF2 more relaxed schedule

presently we are testing fine-mesh PMTs at LASA what is needed is: B field components along/

perpendicular to PMT axis at TOF1/TOF2

X,Y beam profile (rate/cm2) at TOF1/TOF2