1. Beam switching yard interfaces
E. Bouquerel, F. Osswald on behalf of the IPHC group,
CNRS, Strasbourg
EUROν Super-Beam Meeting, June 06, 2012

2. SB baseline layout - Interfacing
AIM:
Identify, gather and specify all nominal beam parameters at the interfaces linked to the switching yard (SY)
WHY?
To improve the SY design
To ensure a global coherence between the subsystems leading to the release of the pions
HOW? Mainly meeting with the CERN community
side view
kinetic energy
rest energy
Beam rigidity:
16.16 T.m (4 GeV)
17.85 T.m (4.5 GeV)
Interface point #1
Interface point #2
Detailed view on SPL- accumulator/SY/target interfaces
oblique view
(1) SPL-accumulator/SY
(2) SY/Target station
(3) Building/SY
Main
interfaces
SY system layout
E. Bouquerel – IPHC, June 06, Slide 2

3. (1) SPL-accumulator/SY interface
Meeting with CERN (R. Garoby et al.) on the 27th March 2012:
Strong interested from the SPL people shown to the EUROnu SB project (see R. Garoby’s talk at the European Strategy for Neutrino Oscillation Physics – II, CERN May 2012)
Creation of an interface note to ease the sharing of information from both side
>LINK<
Chromatic tolerance
Trapezoidal shape, 1 % fat-top duration and variation, overshoot, oscillations, rise and fall times
Truncated parabolic queues
RMS value relative to specific distribution
Instead of 5μs as thought
Baseline parameters at the SPL-accumulator/switching yard interface
Important parameters
E. Bouquerel – IPHC, June 06, Slide 3

4. (1) SPL-accumulator/SY interface
Waiting also for some inputs concerning:
General scenarii SPL, accumulator having an impact on beam characteristics and/or on switching yard
Time delay : asynchronous beam pulse/switching yard
Position (up-stream 1st kicker), aperture (radial profile, dimensions), β function matching (if necessary), (axial profile, length) of a possible beam collimator
Alignment tuning, alignment remote control, remote tuning if required
Technology of beam instrumentation: position, measurement range, remote displacement, intrusive
Equipment for beam alignment / tuning (what, where, how), alignment remote control, remote tuning if required
Any particular safety issues such as dose rate limitation, radiation decay delay, external cooling, beam dumps, waste management
E. Bouquerel – IPHC, June 06, Slide 4

5. (2) SY/Target station interface
Without beam losses
1.33 MW in case of 1 target/horn failure
16.6Hz in case of 1 target/horn failure
Truncated parabolic queues?
With/without hallo
For 1 λ
Baseline parameters at the SY/target station interface
Failure of 1 target, rep. rate becomes 16.6 Hz for each target (same intensity):
Power of the incoming beam becomes 1.33 MW instead of 1MW (still tolerable for targets)
Tolerance on the field errors of the optical elements: 1%.
Abnormal
conditions
The failure of a second target aborts the experiment:
2 working targets not sufficient for the physics
2MW not tolerable for each target (=radiation safety issues)
Any dysfunction or failing magnet aborts the experiment
Risk of having the beam hitting magnets or not centred/focussed onto the target (= safety issues)
Addition of beam dumps and instrumentations after the pair of kickers and after each dipole to manage safety
Failure modes
E. Bouquerel – IPHC, June 06, Slide 5

6. (3) Building / Switching yard interface
Functional drawing of the switching yard (not at scale)
Distance between:
Kicker1 / target station: 30.2m
Kicker1 / dipole 1,3: 17m
- Kicker2 / dipole 2,4: 14.7m
- Dipoles 1,2,3,4 / target station: 12.2m
Distance from the exit of the accumulator to the entrance of the kicker1: 1m (not a fixed value yet as strongly depending on the diagnosis devices needed to control the quality and the position of the beam)
Radius of the whole system: 3m.
Total volume of 960m3
+ The total surface needed for the PSU: 180m2 of surface; 4m of height
E. Bouquerel – IPHC, June 06, Slide 6