1. General remarks about the HESR and PANDA vacuum system
04. February Dieter Prasuhn

2. Vacuum System for the HESR @ FAIR Design parameters
Total average pressure better than 1 x 10-9 mbar at room temperature.
22 sections (incl. 2 for E-Cooler, 1 for PANDA)
Section length range between 6 m and 45 m, max. volume of 280 l.
All vacuum chambers made from AISI 316 LN stainless steel with low hydrogen content and low permeability.
On advice of the MAC 2010:
NEG pumping system and baking is planned.

3. Vacuum sections in the HESR
15/16
E-COOLER
(33/-)
18 Dipol23
(23/144)
17 Quad
(40/249) 14
Quad
(34/210)
13 Kicker
(9/-) 12
Dipol22
(20/127)
Boundary of E-Cooler hall
19 Dipol24
(45/280) 11
Dipol15
(45/280)
20 Dipol31
(41/254)
Vacuum chamber diameter: 89 mm around the ring,
Exception: PANDA section 10
Dipol09
(41/254)
(100/150)
vacuum section valve
length[m]/volume[l]
21 Dipol37
(45/280)
( . / .)
09 Dipol02
(45/280)
22 Dipol44
(26/161) 07
Septum
(17+6/140) 08
Dipol01
(27/166) 01
SEPTUM
(21+6/170) 02 RF
(7/-)
Boundary of PANDA hall 05
Quad
(19/116) 06
PickUP
(6/-)
HR09MH02 03
ANTISOL
(22/138) 04
PANDA (15/92)

4. Further Requirements
The HESR vacuum chamber is designed smooth with an inner diameter of 89 mm all around the ring
All feedthroughs and pumping stations are equipped with RF grids

5. Vacuum System for the HESR @ FAIR pumping body for the arcs
140 pieces in three variations (2 x arc, 1 x straights)

6. Beam diameter changes
q < 35°

7. The PANDA region

8. The PANDA section with magnets and detectors
Slide Valve
HR04VVT01
Slide Valve HR05VVT01
3 m
11.8 m
Pumping Body
HR03VR014
Pumping Body
HR05VR003
6.7 m
13.3 m
SC Antisol PANDA PANDA chicane Dipol

9. The vacuum system in the PANDA section
Pellet or cluster beam
p-bar beam

11. Target cross Ti, wall thickness 0.2 mm inner diameter 20.0 mm
outer diameter 20.4 mm

12. Target pipe Ti, wall thickness 0.2 mm inner diameter 20.0 mm
outer diameter 20.4 mm
Ti, wall thickness 0.3 mm
inner diameter 40.0 mm
outer diameter 40.6 mm

13. The bayonet junction
Torque = 100 N cm

14. HESR beam pipe Ti, wall thickness 0.2 mm inner diameter 20.0 mm
outer diameter 20.4 mm
Ti, wall thickness 0.3 mm
inner diameter 40.0 mm
outer diameter 40.6 mm

15. The Cone Ti, wall thickness 0.5 mm small diameter 20.0 mm
large diameter mm
length mm

16. Some Questions by Herbert Orth:
Types of flanges and sealings in the HESR:
CF flanges, all metal sealed
RF requirements:
RF grids in the pumping crosses
Transitions with an angle less than 35°
Valves with RF bridges
High quality weldings do not disturb the RF