HPPS long ring options

HPPS long V1

NMC cell without the middle dipole and QH3 splitted

μx=0.8 (still for a resonant arc with 5 NMC cells)

Reduced filling factor

Long straight section: μx=0.44, μy=0.56 slightly larger than previous version (is this enough for the collimation system?)

QH

1

QH

2

QH

3Q

H4

Ring params

Circ.: 1256.3

γt=-14.7

Max quad pole tip: 1.7 T @ 50 GeV @ QH3

Dipole gapy=119 mm

Working point (Qx,Qy)=(13.32,7.27)

No crossing of the integer (better than in the case of the previous WP)

FM of the previous lattice showed that the (2, -2) not a limitation needs to be confirmed

Difficult to tune in larger Qx without changing the arc μx

In any case in a more uniform distribution the nectai less wide

SC tune shift up to 4.5 σx,y

DA, FM and tunability studies needed

Space charge

εx=11.9 μm-rad

εy=14.78 μm-rad

Magnet parameters @ 50 GeV

Type Length [m]

V1.1

R [mm] Bpt [T]

MQDS1 (LSS) 2 70.5 -0.93

QH4 (ARC) 1.4 66.3 -0.99

QH2 (ARC) 1.1 62.3 -0.72

MQDS2 (LSS) 2 50.0 -0.07

QH1 (ARC) 1.1 51.6 0.67

MQFS1 (LSS) 2 58.1 0.71

QH3 (ARC) 2 84.8 0.85

V1.1Dipoles:gap_x=158.6 mmgap_y=118.7 mm

HPPS long V2

NMC cell without the middle dipole

μx=0.8 (still for a resonant arc with 5 NMC cells)

Reduced filling factor

Long straight section: μx=0.47, μy=0.5 is this enough for the collimation system?

Ring optics and WP v2.1

Circ.: 1256.3

γt=-13.2

Max quad pole tip: 1.16 T @ 50 GeV @ QH4

Dipole gapy=114 mm

Large betas

Ring optics and WP v2.2

Circ.: 1256.3

γt=-13.7

Max quad pole tip: 1.16 T @ 50 GeV @ QH4

Dipole gapy=123.7 mm

Larger betas

Working point

V2.2

(Qx,Qy)=(13.23,9.23)

SC tune shift up to 4.5 σx,y

V2.1

(Qx,Qy)=(13.41,9.6)

SC tune shift up to 4.5 σx,y

DA, FM and tunability studies needed

Space charge

εx=13.4 μm-rad

εy=13.45 μm-rad

Magnet parametersType Length

[m]V2.1

50 GeVV2.2

50 GeV

R [mm] Bpt [T] R [mm] Bpt [T]

QH3 (ARC)

1.6 62 -1.16 52 -1

MQDS1 (LSS)

2 72 -0.86 68 -0.66

QH1 (ARC)

1.272 54 -0.73 67 -0.87

MQDS2 (LSS)

2 52 0.32 65 0. 3

QH2 (ARC)

1.272 63 0.93 62 0.92

MQFS1 (LSS)

2 78 0. 39 82 0.86

QH4 (ARC)

2.6 74 0.90 74 0.89

v21Dipoles:gap_x=128.1 mmgap_y=105.1 mm

v22 Dipoles:gap_x=115.58gap_y=114.45 mm

Ring optics v2.3

Circ.: 1256.3

γt=-26.1

Max quad pole tip: 1.19 T @ 50 GeV @ QH3

Dipole gapx=128 mm

Dipole gapy=105 mm

Ring optics v2.3

Working point V23

V2.3

(Qx,Qy)=(13.875,12.31)

SC tune shift up to 4.5 σx,y

Space charge & emittance V23

εx=13.4 μm-rad

εy=13.45 μm-rad

Magnet parametersType Length

[m]V2.3

50 GeVV2.3

75 GeV

R [mm] Bpt [T] R [mm] Bpt [T]

QH3 (ARC)

1.6 58 -1.19 49 -1.50

QH1 (ARC)

1.2 57 -1.06 48 -1.33

MQFS1 (LSS)

2 68 -0.68 57 -0.86

MQDS2 (LSS)

2 54 0.27 46 0. 34

QH2 (ARC)

1.2 63 1.06 53 1.34

MQDS1 (LSS)

2 65 0.88 54 1.09

QH4 (ARC)

2.8 65 0.75 60 1.03

50 GeVDipoles:gap_x=127.9 mmgap_y=104.9 mm

75 GeVDipoles:gap_x=118.7 mmgap_y=88.3 mm