1. IR Beam Transport Status
C. Hutton, F. Lin, V. Morozov, R. Rajput-Ghoshal, G. Wei, & M. Wiseman
March 1, 2018

2. Outline Overall area view Magnet design status
Area and cryostat designs
Remaining high level plan
3/1/2018

3. IR Area The design thus far has been considered six distinct areas
Detector Solenoid ( 4 m)
SB1 dipole (1.5 m)
SB2 dipole (~4.6 m)
Ion entrant side cryostat (~8.7 m)
Electron entrant cryostat between the SB1 and Detector Solenoid (~2.6 m)
Ion down beam cryostat between the two dipoles (~11.1 m)
Our work so far has focused on the three beam transport areas
Paul Brindza has done some preliminary work on the detector solenoid, SB1, and SB2 magnets 1 2 5 6 3 4
~32 m i e
3/1/2018

4. Detector Solenoid and IR Vacuum Chamber
The detector solenoid as modeled
4m long, inner radius 150 cm and 10 cm thick
Don’t know if this matches the P. Brindza work
3T field used in beam transport studies
The vacuum chamber geometry defined by Charles Hide
“Interaction Region Optics and Beam Stay Clear for Ion Injection: Impact on Central Vacuum Pipe Design” Dec. 13, 2017
This is being used in impedance, vacuum, and detector studies
160 cm
240 cm e i
Interaction point
3/1/2018

5. SB1 & SB2 Dipole Models SB2 SB1 (CF Ion)
SB1 – P. Brindza 6/23/17
P. Brindza 9/8/17
SB1 and SB2 based on the above designs from P. Brindza
Cryostat w warm bore (blue) & yoke steel (grey)
Other designs are being considered for the SB1
SB1 (CF Ion)
SB2

6. Magnet Design Status
3/1/2018

7. Magnet Design Status
3/1/2018

8. Magnet-Magnet Interaction
Currently looking at the interaction between two closest magnets
QFFDS2 and QFFB1_US
Looking at the following parameters
Stored Energy of the magnet
Field from one magnet on the axis of the other magnet
Field from one magnet on the good field radius of the other magnet
Effect of one magnet on the gradient of the other magnet
Effect on higher order multipoles
Shielding
IPUSCORR2
QFFDS1
IPUSCORR1
QFFB1_US
QFFDS2
QFFDS3 e i
3/1/2018

9. Magnet-Magnet Interaction
QFFB1_US
QFFDS2
QFFB1_US and QFFDS2 Simulated together
Three Simulations:
Simulation 1: Both Magnets at Full current
Simulation 2: QFFDS2 at 0A and QFFB1_US at full current
Simulation 3: QFFB1_US at 0A and QFFDS2 at full current
Stored Energy
Simulation 1: J
Simulation 2: J
Simulation 3: J
Additional stored energy due to mutual inductance is approximately 438 J
Field at the Axis
3/1/2018

10. Magnet-Magnet Interaction
Three Simulations:
Simulation 1: Both Magnets at Full current
Simulation 2: QFFDS2 at 0A and QFFB1_US at full current
Simulation 3: QFFB1_US at 0A and QFFDS2 at full current
Effect on Gradient
QFFB1_US
QFFDS2
3/1/2018

11. Magnet-Magnet Interaction- Higher order Multipoles
3/1/2018

12. Magnet-Magnet Interaction- Higher order Multipoles
3/1/2018

13. Magnet-Magnet Interaction
Shielding
Iron (passive shield)
Coil (active shield)
Results from 10 mm thick passive shields
Parallel magnet configuration
QFFB1_US
QFFDS2
With Shielding
With Shielding
3/1/2018

14. Magnet-Magnet Interaction
Next step
Waiting for simulation to complete with 10 mm iron shield with QFFB1_US inclined
Change iron shield thickness based on the 10 mm thick shield results
Simulate an active shield
Study effect of magnet on the beam line of other magnets (some of the magnets are even closer to the beam line of other ring)
3/1/2018

15. Quad with nested skew quad
Ion Supply Side
Design efforts to date have focused on the ‘Z’ spacing of the magnets
As a rule of thumb we have tried to reserve 10 cm on each magnet end for field optimization, coil clamps etc.
Just starting to look at the radial design and magnet fringe fields
Three identical quads in electron line with nested skew quads
No multipole correctors planned
Three quads in ion line
Still to add nested skew quads and multipole correctors
1.2 m solenoid in each line (same design)
Two horizontal/vertical correctors in ion line near IP
Quad with nested skew quad
IPUSCORR2
QFFDS1
IPUSCORR1
QFFB1_US
QFFDS2
QFFB2_US
EL SOL ANTI_DS
QFFDS3
AASOLEUS
QFFB3_US
1st dipole in Compton chicane e i
3/1/2018

16. Ion Supply Side
Currently looking at stray fields in two ‘worst case’ locations
Between QFFDS1 and QFFB1_US quads
Plan to look near QFFDS1 and other areas as time permits
Requirements, spacing and size of the of ion correctors still being looked at
Common magnet design for now
Do not have the desired 10 cm of space on each end yet
IPSCORR2 is close to the electron vacuum line (~1.5cm) and the detector solenoid (~16 cm along beam line)
IPUSCORR2
QFFDS1
IPUSCORR1
QFFB1_US
QFFDS2
QFFDS3 i e
3/1/2018

17. Ion Supply Side All magnets based on cold bore design
Required for the ion beam quads, optional for the electron beam ones
One cryostat for all magnets
~ 8.7 m long on Ion beam line (~0.026 m beamline contraction)
Little room between magnets for smaller cryostats
18 + (?) magnets quads, 6 skew quads, 2 X&Y correctors, 2 anti-solenoids, (?) multipole correctors, & (?) shielding coils
Super KEKB IR cryostats have 25 and 30 magnets
Cryogenic connections and leads (location TBD)
~8.7m
3/1/2018

18. Cryostat ends
Additional considerations at the beam line ends of each cryostat
Example shown on next slide
Interconnects (space between cryostats and other components)
Reserve 10 to 20(?) cm for bellows, vacuum pumping, assembly etc.
Warm to cold beam tube transitions
Reserve 30 cm for cold bore designs
If we include a bellows this could be less
Since a bellows is also desired in the interconnects for installation, tried to avoid a bellows here to minimize the number of RF shielded bellows
Could be reduced to 10 cm for warm bore designs
With the current beam transport design some of this will end up inside the detector solenoid and SB1 dipole
~8.7m
3/1/2018

19. Warm to Cold Transitions and Bellows
10 cm
4 cm
30 cm
~34 cm inside detector solenoid
Vacuum vessel end wall
RF shielded bellows
Vacuum vessel bellows
10 cm for coil shaping, collar, etc.
30 cm warm to cold transition to flange
Trying to keep bellows out of the beam tube for now
Thin beam tube to minimize conduction, ~0.030”
Includes 4 cm for helium vessel, thermal shield, MLI, vacuum space
10 to 20 cm for shielded bellows, vacuum pumping, etc.
Vacuum vessel and bellows will extend inside the detector solenoid space
Cartoon shown on one vacuum tube only
Similar requirements on the ion down beam side around the detector solenoid and SB1 dipole e
ion
corrector
Quad w skew quad
3/1/2018

20. Ion Down Beam #1
Tried to keep all magnets outside of the SB1 dipole – Self imposed constraint
Common electron beam quad with nested skew quad
Still to add a H/V corrector on ion line
Design specification in progress
Large bore SB1 dipole shown
QFFUS1
IPDSCORR1 ?
QFFUS2
SB1 e i
3/1/2018

21. Synchrotron radiation intercept
Ion Down Beam #1
Intercept needed for synchrotron radiation in the electron line
Placeholder shown as a ‘waist’ in the vacuum tube
Located ~33 cm from QSFFUS1, so within the space needed for a warm to cold transition
May be able to move this when we look at the synchrotron radiation
Could push us to change to warm bore design in this area
QFFUS1 e i
Synchrotron radiation intercept
~33 cm
~53 cm
~4 cm
3/1/2018

22. Cryogenic connections and magnet leads
Ion Down Beam #1
One vacuum vessel between detector solenoid and SB1
~2.6 m long on e beam line
Both beam lines may need to be included in the cryostat
6 + (?) magnets - 2 quads, 2 skew quads, X&Y corrector, & (?) shielding coils
Most in e beam line
Vacuum vessel warm to cold beam tubes will extend into the SB1
~23 cm between QFFUS02 and SB1
Warm bore magnet designs might avoid this
Could consider combining with SB1
Area is closely coupled to SB1 and detector designs
Cryogenic connections and magnet leads
~2.6 m
3/1/2018

23. Ion Down Beam #2
Tried to keep all magnets outside of the SB1 dipole – Self imposed constraint
Common electron beam quad with nested skew quad (QFFUS3)
Solenoid in electron line same design as on ion supply side (EL SOL ANTI_DS)
Large bore solenoid in ion beam line (AASOLEDS)
Three large bore, high strength quads in ion line (QFFB1, 2, 3)
Working on multipole correctors
Four separate skew quads in ion line – final locations TBD (QFFDS01S, 02S, 22S, 03S)
Space is tight for the first one and may need more room between QFFB3 and the solenoid
Working on a corrector design located near the SB1 dipole in ion line (IPDSCORR2)
QFFUS3
IPDSCORR2 ?
QFFB1
EL SOL ANTI_US
QFFB2
QFFDS02S
QFFDS01S
QFFDS22S
QFFB3
QFFDS03S
AASOLEDS
Warm Quad
(not all shown)
SB1
SB2 e i
3/1/2018

24. Ion Down Beam #2 Area near the SB1 is crowded
~8 cm between QFFUS3 and SB1
As shown, ~2 cm to QFFDS01S and SB final location TBD
IPDSCORR2 corrector design in progress
Closely coupled to the SB1 design
Still need to consider detector requirements
QFFUS3
IPDSCORR2 ?
QFFB1
EL SOL ANTI_US
QFFB2
QFFDS02S
QFFDS01S
SB1
3/1/2018

25. Probably one vacuum vessel between the dipoles
Ion Down Beam #2
Probably one vacuum vessel between the dipoles
~11.1 m long along the ion line (~0.033 m cool down change in length)
Both beam lines included (at least near SB1)
~13 + magnets quads, 5 skew quads, X&Y corrector, 2 anti-solenoids, (?) Multipole correctors, & (?) shielding coils
Vacuum vessel warm to cold beam tubes will extend into the SB1
~11.1 m
Cryogenic connections and leads (location TBD)
3/1/2018

26. Near Term Plan
Incorporate detector requirements as needed for the pCDR
Look at stray field mitigation in worst locations
Incorporate the multipole corrector designs in at least one ion quad
Magnet and cryostat radial design for space in the worst location
Investigate the magnet stress in worst large bore ion quad
Generate the preliminary corrector designs for the ion beam line
As time permits, optimize the magnet ends, investigate forces, multipoles, etc. in other magnets
Support vacuum, impedance, detector background studies, etc
3/1/2018

27. Back Up Slides

28. 9/7/17 Electron Beam Entrant Quads
QFFB2e_US
QFFB3e_US
EL SOL ANTI_US e
QFFB1e_US I
IPDSCORR1
SB1
IPDSCORR2

29. 10/27/17 Electron Beam Entrant Quads
QFFUS1
QFFUS3
QFFUS2
IPDSCORR1
SB1