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