1. Emergency dumping of proton and ion beams in SIS100 F
Emergency dumping of proton and ion beams in SIS F. Hagenbuck 8th FAIR Machine Advisory Committee Meeting GSI, Darmstadt, Nov. 26th, 2012

2. F. Hagenbuck, 8th MAC meeting, Nov. 26th, 2012
Introduction
If an unacceptable failure or situation in SIS100 occurs, the beam must be dumped as fast as possible to avoid potential damage. Triggered by signals that will be derived from appropriate detection systems (e.g. quench detection, tolerance violation, equipment failure, etc.) the kicker system has to be fired.(1)
Emergency dumping was already topic in presentations at former MAC meetings:
Machine Protection, P. Spiller, Feb (1)
Slow Extraction, N. Pyka, Feb. 2010
SIS100 interlock systems and machine protection, J. Fitzek, April 2012
F. Hagenbuck, 8th MAC meeting, Nov. 26th, 2012

3. F. Hagenbuck, 8th MAC meeting, Nov. 26th, 2012
Outline
SIS100 Internal emergency dump
SIS100/300 Machine setting dump (as emergency dump)
Requirements and costs
Summary
F. Hagenbuck, 8th MAC meeting, Nov. 26th, 2012

4. F. Hagenbuck, 8th MAC meeting, Nov. 26th, 2012
SIS100 Internal emergency dump
internal emergency dump located in sector 5 (extraction section)
G004
T110
3 kicker kicker kicker magnetic extraction
magnets magnets magnets septa
↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓
internal emergency dump
F. Hagenbuck, 8th MAC meeting, Nov. 26th, 2012

5. F. Hagenbuck, 8th MAC meeting, Nov. 26th, 2012
SIS100 Internal emergency dump
Fast bipolar kicker magnets can extract the full synchrotron load within one turn
Target: internal beam dump at the end of the extraction straight section
Up to E = 51.5 kJ may be deposited within 3 ms
N. Pyka
F. Hagenbuck, 8th MAC meeting, Nov. 26th, 2012

6. F. Hagenbuck, 8th MAC meeting, Nov. 26th, 2012
SIS100 Internal emergency dump
cell 4
magnetic extr. septa
internal emergency dump
internal emergency dump
primarily for heavy ion operation
compact design – total length 24cm
installed directly in the bottom part of the beam pipe
carbon composite core surrounded by stainless steel
not designed for permanent irradiation
Ø 36mm x 170mm
58mm
35mm
F. Hagenbuck, 8th MAC meeting, Nov. 26th, 2012

7. F. Hagenbuck, 8th MAC meeting, Nov. 26th, 2012
SIS100 Internal emergency dump
For high intensity heavy-ion beams a high energy deposition is expected in the carbon-composite absorber.
This causes a high temperature rise in the absorber (e.g. 238U, N = 5x1011)
exceeds sublimation point at low energies and maximum intensity
I. Strasik
Temperature gradient in the carbon-composite absorber can cause a thermal shock or mechanical stress in the absorber, damaging the absorber already at „low“ temperatures (further analysis required)
Energy deposition 2.7GeV/u 238U beam in the dump ~ 40% (total deposited energy per primary ion 246GeV / total kinetic energy of 2.7GeV/u 238U ion 643GeV)
Further important issues:
activation of the beam dump and its surroundings
possible quench of superconducting quadrupoles located ~1m downstream
F. Hagenbuck, 8th MAC meeting, Nov. 26th, 2012

8. F. Hagenbuck, 8th MAC meeting, Nov. 26th, 2012
SIS100 Internal emergency dump
Ø 36mm x 170mm
58mm
35mm
not suited for protons
Use of SIS100/300 machine setting dump in the HEBT system as SIS100 emergency dump.
F. Hagenbuck, 8th MAC meeting, Nov. 26th, 2012

9. SIS100/300 machine setting dump
concrete
iron
designed for 90 GeV p
(graphite core will be foreseen – acc. to SiST)
Dump
located at an intermediate level @ -9.4m
F. Hagenbuck, 8th MAC meeting, Nov. 26th, 2012

10. F. Hagenbuck, 8th MAC meeting, Nov. 26th, 2012
SIS100/300 machine setting dump
pass through three sections T1X1, T1C1, T1D length of beamline: 140m
Dump
F. Hagenbuck, 8th MAC meeting, Nov. 26th, 2012

11. F. Hagenbuck, 8th MAC meeting, Nov. 26th, 2012
SIS100/300 machine setting dump
SIS100/SIS300
SIS100/SIS300 beam dump
CBM cave
Super-FRS
SIS m
SIS m
Super-FRS and other 0m
CBM -6m
SIS100/SIS beam -9.4m
temporary SIS300 beam line +1.4m
heights relative to SIS18 beam hight
T1X1
T1C1
T1D1
T110
G004
to SFRS
to Dump
to CBM
Dump
T112
to CBM
to SFRS
F. Hagenbuck, 8th MAC meeting, Nov. 26th, 2012

12. F. Hagenbuck, 8th MAC meeting, Nov. 26th, 2012
SIS100/300 machine setting dump
50x20 mm mrad
T1X1
T1C1
T1D1 u l d
Dump
magn. extr. septa
Δp/p = 0.1%
switched off divider dipoles and quadrupoles
p x4 mm 4GeV (16.2Tm)
U x14 mm 200MeV/u (18Tm)
F. Hagenbuck, 8th MAC meeting, Nov. 26th, 2012

13. F. Hagenbuck, 8th MAC meeting, Nov. 26th, 2012
Requirements and costs
Requirements:
Ramping of sections T1X1, T1C1, T1D1 synchronously to SIS100
If the end of the ramp is reached, the divider magnets needed to deflect the beam into the beam lines to the experiments must be switched on „as fast as possible“ (to keep the impact on parallel operation as small as possible).
For this
Check/adapt the magnet parameter tables of the affected magnet types
Check/adapt the Power Converter layout of the affected elements
Investigation of two different scenarios:
Scenario 1: Proton operation – due to the large cooling time of the CR the ramp rate of SIS100 dipoles could be reduced to 3T/s.
Scenario 2: Ion operation with nominal ramp rate of SIS100 dipoles of 4T/s
F. Hagenbuck, 8th MAC meeting, Nov. 26th, 2012

14. F. Hagenbuck, 8th MAC meeting, Nov. 26th, 2012
Requirements and costs
Affected HEBT Magnet Types:
3 Types of Dipoles: dip10_0 (divider, 2), dip13_0 (4), dip13high (1); all Bmax=1.8T
2 Types of Quadrupoles: quad11 (10), quad12 (divider, 4); all Gmax=15T/m
Required ramp rates for HEBT magnets are given by scaling with SIS100 values (Dipoles: Bmax= 1.9T, max. ramp rate 4T/s; Quadrupoles Gmax=27T/m, max. ramp rate 57T/m/s)
Scenario 1 (Proton operation)
HEBT dipoles dip13_0, dip13high: ramp rate 1.8T/1.9T*4(T/s)*(3/4)=2.84T/s
HEBT quad11: ramp rate (15T/m)/27(T/m)*57(T/m/s)*(3/4)=23.75T/m/s
Scenario 2 (Ion operation)
HEBT dipoles dip13_0, dip13high: ramp rate 1.8T/1.9T*4(T/s)=3.8T/s
HEBT quad11: ramp rate (15T/m)/27(T/m)*57(T/m/s)=32T/m/s
Divider magnets
dipole dip10_0: Umax limited to Umax420V  ramp rate 6.5T/s, rise time 277ms
quadrupole quad12 (Gmax=15T/m, rise time 277ms): ramp rate 54.2 T/m/s
F. Hagenbuck, 8th MAC meeting, Nov. 26th, 2012

15. F. Hagenbuck, 8th MAC meeting, Nov. 26th, 2012
Requirements and costs
The parameter tables of all affected HEBT magnet types (dip10_0, dip13_0, dip13high, quad11, quad12) were adapted to the required ramp rates of scenario 2 (ion operation).
The adapted parameter table of dip13_0 is included in the detailed specifications of HEBT Dipoles Batch1.
The other magnet types belong to Batch2 (and Batch3), the detailed specifications are currently in work.
F. Hagenbuck, 8th MAC meeting, Nov. 26th, 2012

16. F. Hagenbuck, 8th MAC meeting, Nov. 26th, 2012
Requirements and costs
Cost increase for Power Converters depends on how it was intented to operate the HEBT beamline sections originally
in detail for the first elements of T1C1:
F. Hagenbuck, 8th MAC meeting, Nov. 26th, 2012

17. total cost increase for power converters
Requirements and costs
total cost increase for power converters
F. Hagenbuck, 8th MAC meeting, Nov. 26th, 2012

18. Summary THANK YOU (and my colleagues)
SIS100 internal emergency dump is designed for dumping heavy ion beams and is not suited for protons.
To use the SIS100/300 machine setting dump in the HEBT system as emergency dump the beamline SIS100-Dump has to be ramped synchronously to SIS100.
All magnet parameter tables are already adapted (and included in the specifications given/to give to FAIR).
Cost increase for power converters amounts to 30% (Ion operation) and 23% (Proton operation)
THANK YOU (and my colleagues)
F. Hagenbuck, 8th MAC meeting, Nov. 26th, 2012