Review for the SPSC by Mike Tarbutt and Gerda Neyens based on Letter of Intent submitted to SPSC and INTC January 2018 SPSCI247 Memorandum submitted to INTC June 2018 INTCM018 Slides provided by Alexandre ID: 792058
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Slide1
Proposer: Alex Obertelli, TU Darmstadt
Review for the SPSC by Mike Tarbutt and Gerda Neyens based on
Letter of Intent submitted to SPSC and INTC, January 2018, SPSC-I-247
Memorandum submitted to INTC- June 2018 (INTC-M-018)
Slides provided by Alexandre
Detailed written replies from PUMA to a set of written questions from us
Follow up discussion by Skype on 12
th
October
Feedback from the AD user group to a note prepared by PUMA on potential impacts in the AD hall
Slide2Goal: probe the density tail of the nucleon wave function
neutron skins and halo’s
Detect net charge of pions
info on annihilation on p or n
theoretically investigated for radioactive ions by Wada and Yamazaki
Slide3Goal: probe the density tail of the nucleon wave function
neutron skins and halo’s
Slide4Collect antiprotons at ELENA in a transportable trap
Transport the trap to ISOLDE, connect to a low-energy RIB line
(ERC project ends Dec. 2022)
Slide5Slide6--
AEGIS has trapped 2.10
7 /cm3 [S. Aghion et al., EPJD 72, 76 (2018)]
Slide7Slide83 gauss and 5 mT lines
4 Tesla field
Active and passive shielding
3 gauss at 1.8 meters from centre
Dimensions: 1.8 m (l), 1.3 m (outer diameter)
Supplier: Noel - Bilfinger
Delivery: February 2020
Slide9In addition, a UPS system is
attached to provide power during transportation.
Slide10Slide11for connection to ELENA / ISOLDE vacuum (10
-6
mbar)With thickness = 10-20 nm
energy loss and angular straggling of heavy ions still too high
Note: 300 nm has been used at 1 atm
Challenge:
connexion to ELENA and ISOLDE vacuum
Both options will be tested at TU Darmstadt, conductance barrier seems necessary
Slide12Bore: diameter 30 cm
Slide13Resources
Manpower at TU DarmstadtCurrently: 1 professor, 3 postdocs (100%), 2 PhD students (100%), 2 Master students (100%), 2 Bachelor students (100%)- Open positions: 1 staff (to be filled by summer 2019)
Collaborationabout 20 collaborators from theory and experimentnew collaborators joiningBudgetERC PUMA (2.7 Meuros)
Alexander von Humboldt foundation (funds for lab and personal at TUDa)
Application to BMBF under consideration (deadline April 2019)
Slide14Summer 2020
: Test transport of the trap with protons in
Autumn 2020: earliest day of transport trap to ELENA
By mid 2020:
completion of testing all parts of the system
TIME LINE – PLANNING (most optimistic scenario)
November 2018:
magnet order to Noel-Bilfinger
February 2019: installation of test solenoid in laboratory at TU Darmstadt
From January 2019:
• build the trap
• start trap tests (protons) inside test magnet
End of 2021
: First collection of antiprotons
2022 (end of the ERC project):
first physics with stable ions (at ELENA)
Slide15Summary of vacuum challenges
Slide16issue: location of PUMA at ELENA
PUMA needs to have slow p-bar
s (ELENA) and a further decelerator
(to slow down from few 100
keV
to few
keV before injection into PUMA) - THIS IS AVAILABLE at GBAR
They will
build
an own decelerator
–
means
more floor space needed
.
Can a candidate location be investigated before PUMA is accepted as a CERN experiment ?
Minimum floor space and required height:
5 m x 2 m - 2.7 m
+ space for a decelerator (if not at GBAR)
Slide17Slide18Slide19Need p-bar/nuclei energy below few keV to enter the PDT
need a decelerator (e.g. GBAR) or RFQ cooler/buncher (ISOLDE)
Slide2050 keV entrance energy
Will be tested at TU Darmstadt