1. HESR for SPARC
25th November FAIR MAC Dieter Prasuhn

2. Outline Basic parameters of HESR HESR for SPARC Summary
25. November 2013
Dieter Prasuhn

3. The FAIR facility
25. November 2013
Dieter Prasuhn

4. Basic Parameters of HESR

5. Design criteria for the HESR
The HESR was originally designed as a synchrotron and storage ring for anti-proton physics with one internal user:
PANDA
So, PANDA defined the basic design criteria.
The Modularized Start Version made a new scheme of injection and accumulation necessary, which reduces the achievable intensity of anti-protons in the HESR.
25. November 2013
Dieter Prasuhn

6. Basic Data of HESR Circumference 574 m 2 arcs of 155 m
Stochastic cooling
Circumference 574 m
2 arcs of 155 m
2 straight sections of 132 m
Momentum (energy) range
1.5 to 15 GeV/c ( GeV)
Injection of (anti-)protons from CR / RESR at 3.8 GeV/c
Maximum dipole field: 1.7 T
Dipole field at injection: 0.4 T
Dipole field ramp: T/s
Acceleration rate 0.2 (GeV/c)/s
long.
Kicker
vert. PU
hor.
Electron cooler
PANDA
p_bar injection
25. November 2013
Dieter Prasuhn

7. Cooling in HESR Electron cooling:
8 MeV electron cooler not forseen in the MSV
2 MeV electron cooler (now in COSY) used at injection
Stochastic cooling:
for b>0.84
Frequency band 2-4 GHz
25. November 2013
Dieter Prasuhn

8. SPARC in the HESR

9. Data for Heavy Ions (238U92+)
Injection: B*r=12 Tm (740 MeV/u) b = 0.83
Maximum magn. rigidity B*r=50 Tm (5 GeV/u)
b =0.98
Minimum magn. rigidity B*r= 5 Tm (170 MeV/u)
b =0.53
Stochastic cooling possible at injection
Below injection only electron cooling is available
25. November 2013
Dieter Prasuhn

10. Requirements of SPARC Different ion species
Location in front of a dipole
Inlet for a laser
Intensities up to 109 stored ions
Targets: H-cluster, H-pellet or superfluid target, fiber targets
Continuation of ESR experiments
25. November 2013
Dieter Prasuhn

11. 25. November 2013
Dieter Prasuhn

12. Possible ways for ions into the HESR (Modularised Start Version)
SIS18
SIS100
p-linac
acceleration in UNILAC and SIS18
Bypass the antiproton target
collection and pre-cooling of ions in the Collector Ring CR
transfer of ions at 12 Tm to HESR
(accumulation and) storage, acceleration and cooling of ions in the HESR
UNILAC
SFrS
HESR
pbar target/ separator CR
25. November 2013
Dieter Prasuhn

13. Implications for the HESR
The tunnel needs an extension at the SPARC installation (accepted by FAIR with Change request CR097, April 2013)
The design of dipoles had to be changed slightly to give space for a laser window (no problem)
One quadrupole downstream of SPARC needs a “laser hole” in the yoke (no problem)
The radiation protection is safe for a loss rate of 109 ions per second.
25. November 2013
Dieter Prasuhn

14. Experimental conditions for ions in the HESR
Requirements:
Ions: 238U92+
Proposed experiments use 108 ions
Simulations were carried out for different modes:
Experiments at injection energy (740 MeV/u)
Experiments at 2 GeV/u
All simulations are carried out by Hans Stockhorst
and Takeshi Katayama
25. November 2013
Dieter Prasuhn

15. Beam Preparation for Experiment at 740 MeV/u
Incoming bunch from CR will be captured with
h = 1 cavity
Adiabatic reduction of cavity voltage:
⇒ momentum spread will be reduced.
Now Barrier Bucket can keep the beam
Inserting the target: mean energy loss compensated by BB
Stochastic cooling
25. November 2013
Dieter Prasuhn

16. Momentum cooling at 740 MeV/u
(simulation by H. Stockhorst and T. Katayama)
25. November 2013
Dieter Prasuhn

17. Experiments at 2 GeV/u Injection from CR into h=1 bucket of HESR
Acceleration to 2 GeV/u (16 s)
Adiabatic debunching of the beam
Capture in the Barrier Bucket
Stochastic cooling and target on
25. November 2013
Dieter Prasuhn

18. Implications for HESR operation
Dipoles of CR, HESR and transfer line have to reverse polarity
The design vacuum of 10-9 mbar seems reasonable also for heavy ions
The “standard optics” works, improvements are under discussion
Electron- and stochastic cooling are necessary for the HI-experiments
Our requirement: The experimental installations have to be easily removed
25. November 2013
Dieter Prasuhn

19. Improvement of vacuum
According to an early recommendation of MAC heating and NEG-coating is foreseen in the dipole sections
25. November 2013
Dieter Prasuhn

20. Dipole sections foreseen for heating
Sektion 9
Sektion 10
Sektion 11
Sektion 21
Sektion 20
Sektion 19
Sektion 18
Sektion 12
Sektion 22
Sektion 8
Abschnitt Dipol
25. November 2013
Dieter Prasuhn

21. Crossection of a dipole
Outer diameter of the vacuum chamber: 93 mm
Yoke distance: mm
Available space for heating and insulation: 3 mm !
25. November 2013
Dieter Prasuhn

22. Heating jackets for the test bench
25. November 2013
Dieter Prasuhn

23. Test bench to measure the heat distribution and temperature profile on the „dipole yokes“
25. November 2013
Dieter Prasuhn

24. Summary: HESR
SPARC is satisfied with the energy range of HESR for their experiments
The HESR acceptance is sufficient for the beam conditions from CR
Beam handling for different experiment energies are simulated
Vacuum is sufficient but will be improved by heating
Radiation protection is less severe for Heavy Ions than for (anti-) protons.
25. November 2013
Dieter Prasuhn

25. Thank you for your attention
25. November 2013
Dieter Prasuhn

26. Status of the HESR-Project

27. Prototype testing in COSY
The barrier bucket cavity is tested in COSY with the WASA pellet target
A beam profile monitor is in permanent use at COSY
New Pickup structures for the stochastic cooling were tested in COSY
(at the NUCLOTRON in Dubna a prototype tank was used for the first stochastic cooling experiment)
25. November 2013
Dieter Prasuhn

28. 2 MeV electron cooler is installed and commissioned at COSY
Built and commissioned
by BINP Novosibirsk
25. November 2013
Dieter Prasuhn

29. 1st cooling with the 2 MeV electron cooler at COSY (October 17th, 2013)
Cooling of 645 MeV/c protons (109 keV electron energy) Protection gas vessel filled with 3 bar Nitrogen Magnetic field: 0.5 T Electron current 250 mA
25. November 2013
Dieter Prasuhn

30. Bunch length reduction
25. November 2013
Dieter Prasuhn

31. Momentum spread
25. November 2013
Dieter Prasuhn

32. Beam profile
25. November 2013
Dieter Prasuhn

33. First major components are ordered
The In-Kind contract between FAIR and Jülich was signed in 2012
Main magnets, i.e. dipoles and quadrupoles are ordered by FAIR.
Quadrupole power supplies have been ordered
RF-components for stoch. cooling and acceleration cavity have been ordered
Injection kicker is ordered
All other components are specified and will be ordered according to our time schedule and spending profile
25. November 2013
Dieter Prasuhn

34. In-Kind contributions to HESR
The In-Kind contract between FAIR and Slovenia for the beam diagnostics is under preparation.
The In-Kind contract with Romania for the sextupoles, closed orbit steerers and the corresponding power supplies is signed.
25. November 2013
Dieter Prasuhn

35. HESR overall time schedule
All detailed specs are ready and part of the In-Kind contract
We still assume the building to be “ready to move in” January 2017
Then installation in the tunnel in 2017,
commissioning without beam 2018,
commissioning with beam in 2018
start experiment 2019
what ever it is,
wherever it comes from
25. November 2013
Dieter Prasuhn

36. Thank you for your attention
25. November 2013
Dieter Prasuhn