Lab. Director’s Meeting
IHEP, Protvino, Russia, 15-16 January 2008
D. Reistad, The Svedberg Laboratory, Uppsala University
• Antiproton momentum, 1.5 –15 GeV/c• Electron cooling up to 8.9 GeV/c (4.5 MeV electron energy)• Stochastic cooling above 3.8 GeV/c
High Energy Storage Ring • HESR is presently being designed by a consortium consisting of FZ-Jülich, GSI
and UU.• Uppsala University has taken the responsibility for designing the high energy
electron cooler.
Target 4*1015 H/cm2
Exit bend
Entrance bend
Return bend
Return straight
Interaction straight
Section field strenght length[T] [m]
Acceleation column 0.07 4Transition 0.07- 0.2 3Entrance bend 0.2 6Interaction straight 0.2 24Exit bend 0.2 13Return straight 0.2 25Horizontal return bend 0.2 6Vertical return bend 0.2 6Transition 0.2 - 0.07 3Deceleration column 0.07 4Total 94
HESR Electron Cooler
Magnet modules
Energy (MeV) 0.45 - 4.5
Current (Amp) 1
Solenoid field (T) 0.2/0.07 T
Straightness (rad rms) 10-5
Interaction length 24 m
Bending radius 4 m
Björn Gålnander, SFAIR-meeting, 2007-11-13
Electrostatic Accelerator
Gun
Collector
Pellet chain
HV solenoid
High-voltage column based on Pelletron
Björn Gålnander, SFAIR-meeting, 2007-11-13
H- beam
•Magnetic spectrometer for precise energy control•Absolute energy calibration by means of 7Li(p,n)-reaction: Ethreshold = 1880.3558 0.0812 kV (Standard for AMS)
M€
Pelletron 2.840
High voltage tank 0.750
Other equipment in high voltage tank 1.315
magnet system 4.799
power supplies 0.574
vacuum chambers 0.641
magnetic field measuring equipment, electron beam diagnostics, controls 2.180
total hardware estimate 13.098
50 manyears, travel 3.500
TOTAL 16.598
Cost estimate October 2007
We would like to invite partners, who want to realize this high-energy electron cooler together with us.
All details are subject to negotiations.
Present situation in Sweden:
Sweden has declared that it will contribute 10 M€. (We hope that this amount will be increased at least to 1 % of the full FAIR)
Recent decisions:
Stockholm University (MSL) gets 30 MSEK (3.2 M€) provided that CRYRING becomes LSR
Funding agency (“Vetenskapsrådet”) is aware of cost of high-energy electron cooler . Uppsala University (TSL) gets prolongation of “salary guarantee” for staff until 31 May 2009. Also funds to realize and test prototype electron gun and collector.
Björn Gålnander, SFAIR-meeting, 2007-11-13
Gun and Collector Design
•Anode voltage 26 kV•Beam current 1 A•Cathode diameter 10 mm•Cathode field 0.2 T
•Anode voltage 26 kV•Beam current 1 A•Cathode diameter 10 mm•Cathode field 0.2 T
•Pulsed beam•Fast closing of the gun•Produce pencil beam
•Pulsed beam•Fast closing of the gun•Produce pencil beam
•Collector voltage 3.5 kV•Efficiency < 99.999%•Secondary electrons are suppressed by a bent magnetic field
•Collector voltage 3.5 kV•Efficiency < 99.999%•Secondary electrons are suppressed by a bent magnetic field
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