---

AIRIS Design Parameters

---

The three main components of AIRIS include a momentum achromat, an RF sweeper, and a buncher/rebuncher resonator. The design considered a number of variables, including large transmission and acceptance of secondary beams produced in-flight, suppression of the unreacted primary beam, and allowance for stable beam tunes through the device when it is not in use.

Information on each sub-section is below.

Momentum Achromat

A block diagram of the magnetic chicane, which resides between two sets of quadrupole doublets, is shown below along with a table of detailed paramters.

Parameter	Value	Units
Total Length	6.6	m
Angular Acceptance	75	mrad
Momentum Dispersion at Mid-Plane	1.2	mm/%
Dipole Bend Angle	22.5	degrees
Dipole Radius	1	m
Dipole Full Gap	8	cm
Dipole Max Field	1.75	T
Quadrupole Full Aperture	15	cm
Quadrupole Length	20	cm
Quadrupole Max Field	1	T

Buncher/Debuncher Resonator

Bunching or Debunching of the secondary beam can be performed by a superconducting cavity. The parameters of the cavity used for the design and transmission calculations are below.

Parameter	Value	Units
Aperture	3.8	cm
Frequency	72.75	MHz
Maximum Voltage	3	MV
Cavity Beta	0.075

RF Sweeper

The RF sweeper provides contaminant beam reduction through velocity differences (time-of-flight separation). The parameters below have been used in the design and transmission calculations are below. They are based on the current ATLAS operating sweeper.

Parameter	Value	Units
Electrode Length	1	m
Frequency	6.0625	MHz
Maximum Voltage	70	kV