Lajos Bojtar New requirements for BASE BASE is aiming directly for magnetic moment measurement of a single pbar with a 1E9 precision ATRAP measured already with 1E6 precision ID: 224433
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Slide1
BASE status and integration
Lajos
BojtarSlide2
New requirements for BASE
BASE is
aiming
directly for
magnetic
moment measurement
of a single pbar with a
1E-9
precision
. (ATRAP measured already with 1E-6 precision)
Since this experiment is very sensitive to RF noise and magnetic fluctuations,
t
hey
can make good use of the zone without beam for EMC studies
.
Therefore
the priority
for BASE is the
availability of the experimental
zone
as soon as possible.
BASE will provide manpower for the integration work.Slide3
New line layout
Picture from Wolfgang B.Slide4
B
ASE zone with the optimized transfer lineSlide5
Choice of magnets
Same type of
bendings
as for ASACUSA, ATRAP and ALPHA. Their design and coils are available and the optical properties are well known from studies in 2011, 2012
Many air cooled quadrupoles are available in stock, they need to be refurbished.
Corrector dipoles are available in stock as reserves for the booster. Replenishment of the reserve until ELENA is ready?Slide6
The layout was optimized since the TDR
The optimized version is shorter by 87 cm -> more space for the experiment
Only 3 quads are needed with bigger maximum dispersion (~28m). Still fits safely into the aperture limitation.Slide7
Drawings
There is no design of the vacuum chambers yet.
The preliminary “drawing“ I did is made for predicting space requirements for the elements.
A proper design and drawing has to me made.
The preliminary “drawing “ was made mainly by copying existing drawing blocks.
T
he final design will not be very far from the preliminary one.Slide8
Reuse existing design of parts
Same vacuum chamber for all
b
endings
. The existing design
can be used.
Tried to foresee supports and
bellows, but this must be done
p
roperly.Slide9
Optics
At the focal point beta is 1 m and the dispersion is zero.Slide10
Optics
- The main contributor to the horizontal beam size is the dispersion.
- dp/p is about 1.3E-3 with bunch rotation.
This gives about
+-3.3
cm maximum beam size.
- At the quadrupoles please use vacuum chambers with diameter close to the maximum allowed by the quadrupoles (13 cm).Slide11
Beam sizes with 5 [pi mm mrad] emittance and dp/p =1.3E-3Slide12
Optics
To provide space for the DE5.BHZ10, the quadrupole DE0.QN40 has to me moved upstream by 77 cm. This magnet is common for several experiment.
It has been verified that the beam can be provided to the existing experiments with suitable optical parameters after the movement of the DE0.QN40.Slide13
Radiation
The BASE zone has been verified from the radio protection point of view by simulations.
The radiation level due to the BASE zone will be below the allowed limit in the ASACUSA barrack, which is nearby.
Maybe an additional radiation monitor is needed.Slide14
Manpower
Item
Man
days
Can be done during LS1?
ATRAP
cleaning room
removal
(BASE provides manpower)
86
YES
Bending magnets
yokes
45
YES
GEM profile monitors
40
YES
Power supplies
30
Probably YES
Vacuum
20
YES
Shielding blocks installation
20
YES
He recovery install
20
YES
Refurbish quadrupoles
10
YES
Magnet installation
10
YES
Electricity
4
YES
Access control
4
YES
IT network
2
YES
Control
3
Busy, but
Magnet support
??
??
Cabeling
??
Probably YESSlide15
Draft planningSlide16
Conclusions
The experimental area without beam line will be available by end of September 2013. This is the first priority for BASE.
It seems possible to install the beam line by end of LS1
(2014 May).