# Presentation: 923313

## 400 MeV Transfer Line                 New Injection Scheme

- 400 MeV in a nutshell
- Optical Functions
- Matching to Booster lattice

## 400 MeV in a nutshell

- Transfer Line (TL) is ~65m long.
- TL is composed by

| Active Elements |  |
| --- | --- |
| Quadrupoles | 16 |
| Dipoles |   7 |
| Trims | 13 |
| Lambertson |   1 |
| Chopper |   1 |
| DCSep |   1 |

| Passive Elements |  |
| --- | --- |
| Beam Pos. Mon. | 18 |
| Beam Loss Mon. | 14 |
| Multi Wires | 12 |
| Toroids |  3 |

## 400MeV in a nutshell cont.

- Line optics:
- FO DO FO DO DO FO DO FO DO FO FO FO DO DO FO FO
-  Q2   Q3   Q4    Q5   Q6    Q7   Q8    Q9   Q10 Q11 Q12 Q13  Q14  Q15  Q16 Q17
- _[Demo](http://adwww.fnal.gov/proton/booster_400MeV/Lattice/Demo/Optics/Optics.html)_
- TL simulation is based on MAD-8.
- Starting: 1⁄2 L:Q74
- Ending:  Injection Foil

## Optical Functions

- β max  ≈ 64.0 m (vert.)
- D max =   3.8 m (hor.)

- chute

- Q13

- Reasonable agreement with
-   wire data

## TL Activation History

- F.G. Garcia

## Motivation for the                             new injection scheme

- - Installation of new orbump magnets
-     rearrangement of injection girder
- - Minimize the effect of beam motion due to field edges at injection
-     remove existing DCSEP magnet
- - Major reconfiguration of the 400 MeV TL at injection
-    rearrangement of  the line downstream of Q13
-   *(preserving debuncher stationing)*

- F.G. Garcia

## What needs to be changed?

- One possible stationing would look
-                                             something like....

- Unit:meter

- F.G. Garcia

## ...and for the quadrupoles...

| Device | Start | Final |
| --- | --- | --- |
| B:Q13 | 95.23 | 66.60 |
| B:Q14 | 4.973 | 2.91 |
| B:Q15 | 19.45 | 16.55 |
| B:Q16 | 15.82 | 16.35 |
| B:Q17 | 6.823 | -5.72 |

- Trivial changes!

- F.G. Garcia

## Comparison: Existing Scheme   vs   New Scheme 

-               βx =  6.412       βy = 23.276
-               αx = -0.117       αy =  0.017

-             βx =  6.292     βy = 20.997
-             αx = -0.091     αy =  0.092

-              **D****x**** =  4.0           ****D****x**** = 2.149**
**             ****D****y**** =  0.075       ****D****y**** = 0.81**

-             **D****x ****=  1.79      ****D****x****  = 2.180**
**            ****D****y ****=  0.78      ****D****y****  = 0.037**

- 400MeV           Booster

- 400MeV           Booster

## Conclusions

-  A new injection scheme has been proposed.
-  It was shown that is possible to match beta’s
-  and alpha’s to booster lattice.
- However, matching to the dispersion function proved to be not so easy. Work continues...

- F.G. Garcia

## END

- F.G. Garcia

## General Overview

|  |  |  |  |  |
| --- | --- | --- | --- | --- |
| Quads | Physical Length |  | Effective Length |  |
| l_Q74 | 0.0700 | m | 0.0853 | m |
| l_LL | 0.2540 | m | 0.2906 | m |
| l_Green | 0.2540 | m | 0.2956 | m |
| l_trim | 0.2508 | m |  |  |
| Instr. |   |   |   |   |
| l_bpm | 0.1880 | m |  |  |
| l_rw | 0.0508 | m |  |  |
| l_mw | 0.3302 | m |  |  |
| l_tor | 0.0699 | m |  |  |
| l_bv | 0.0620 | m |  |  |
| Dipoles | Physical Length |  | Effective Length |  |
| l_lam* | 0.8493 | m | 0.8493 | m |
| l_mv0 | 0.4681 | m | 0.6507 | m |
| l_mh1 | 1.2192 | m | 1.3020 | m |
| l_mv1 | 1.0668 | m | 1.1621 | m |
| l_mv2 | 1.0668 | m | 1.1621 | m |
| l_mh2 | 1.2192 | m | 1.3020 | m |
| l_dcsep | 1.2827 | m | 1.3205 | m |
| l_orbmp | 0.4830 | m | 0.5102 | m |
| l_chopper** | 1.3825 | m | 1.3825 | m |

- _General Overview_
- - Quadrupoles
- - Dipoles
- - Instrumentation

| 11.46 | T/kA |
| --- | --- |
| 15.41 | T/kA |
| 52.64 | T/kA |

**TF’**

## Transfer Line to Booster Ring

| TL length to 
Booster ring | 64.645 m |
| --- | --- |
| Beta-max (H)
Beta-max (V) | 32.13 m
56.16 m |
| Beta-min  (H)
Beta-min  (V) | 0.88 m
0.50 m |
| Dispersion at entrance | 0 m |
| Dispersion Max
(at injection foil) | 4 m |
| Injection Point  | L01 |

## Efficiency >95%

**Efficiency >95%**

- F.G. Garcia

## Booster Requires...

- Booster simulation @ foil
- βx =  6.412    βy = 23.276
- αx = -0.117    αy =  0.017
- Dx =  2.149   Dy =  0.075

- New Injection Scheme
- Booster simulation @ foil
- βx =  6.292    βy = 20.997
- αx = -0.091    αy =  0.092
- Dx =  2.180   Dy =  0.037

- F.G. Garcia

## New Injection Scheme Optics

- It is possible to match
- β’s and α’s to booster** **lattice...

- However, more investigation is
-   needed to better match the
-   dispersion functions!

## What needs to be changed

- Ideal situation would be to preserve all the existing configuration up to Q13.
- The scheme being proposed requires a 17o horizontal bend downstream of Q13. One could accomplished this by using only 2 MH2 magnets (existing line has 3 of these magnets).
- 4 quads would then be located downstream of the bender to help matching into booster.

- F.G. Garcia