Beamtime Estimate

Table 3 summarizes the assumptions in our beamtime estimate. The principle idea assumes a $12~\mu$s cycle with a DC surface muon beam with an intensity of 1.5 x 10⁷/s. Then, 15 muons arrive at the stopping target during the $1~\mu$s accumulation period. On average 12 are left at the start of the measuring period. The geometrical acceptance of the detector system will be 75% or higher and the overall uptime of the experiment (livetime, tape changing, etc.) is estimated to be 80%. This brings the number of hours to record 10¹² muon decays to 475. At PSI, this translates to a request for 3.8 weeks of production time.

Table 3: Beamtime Estimate

Quantity	Typical value
$\mu^{+}$ flux	1.5 x 107/s
$\mu^{+}/T_{acc}$	15
$\mu^{+}/T_{mp}$	12
Detector Acceptance	75%
Experimental Uptime	80%
Measured Events per Hour	2.1 x 109
Total Number of Events	1012
Total Number of Hours	475
PSI Weeks 125 h/week	4