psb h 0 -h - injection: sectorisation analysis
DESCRIPTION
PSB H 0 -H - Injection: Sectorisation Analysis. C.Pasquino, J. Hansen, P.Chiggiato. Why re-sectorising this sector?. At the moment the sector valves are foreseen to be positioned right before and right after the stripping foils;. Foil. A different sectorisation would allow: - PowerPoint PPT PresentationTRANSCRIPT
LIU - PSB Ho-H- Injection Meeting 1
PSB H0-H- Injection: Sectorisation Analysis
C.Pasquino, J. Hansen, P.Chiggiato
LIU - PSB Ho-H- Injection Meeting 2
Why re-sectorising this sector?At the moment the sector valves are foreseen to be positioned right before and right after the stripping foils; A different sectorisation would allow:
- Less radiation for TE/VSC during pumping and leak detection.
- More space for installation of stripping foils.
- Positioning of the sector valves away from a radioactive area;
- Less problems to find space for pumping and venting.
- A bigger sector might help in controlling the initial phase of the pump down and venting, preventing a sudden rupture of the graphite foils (experimental test are ongoing…)
Foil
Dump
LIU - PSB Ho-H- Injection Meeting 3
Several Case Study (1)Option1
Option2
Option3
1. Reference case study, always for 1 ring.
2. Sector valve at the third manifold to the left of the injection zone and after the stripping foil.
3. Sector valve at the third manifold to the left of the injection and at the third to the right.
= Sector Valve
LIU - PSB Ho-H- Injection Meeting 4
Several Case Study (2)
Option 4
Option 5
4. Sector valve at the first manifold to the left of the injection and after the dump. With double SIPs between BSW 1&2.
5. Sector valve at the first manifold to the left and at the first manifold on the right, With double SIPs between 1&2 and 3&4.
The pump down curve for all the options has been studied: for case 1 , 4 and 5, the pressure profile along the beam pipe will be presented as well.
LIU - PSB Ho-H- Injection Meeting 5
Pump down studies: option 1The pump down of a sector is divided in two stages:1. A fix TMP group takes care of
the pump down from atmospheric pressure down to 1*10-6 mbar;
2. At 1*10-6 mbar the sputter ion pump are flashed and switched on.
The time from atmospheric pressure to 1*10-3 mbar is not included and it will depend on the experimental results from the stripping foils test (ongoing).If we consider that at 1*10-7 mbar a first low intensity beam can be sent 5 to 6 hours after the end of the intervention including the leak detections.
0 2 4 6 8 1010-8
10-7
10-6
10-5
10-4
10-3
P (m
bar)
t (h)
Stripping foil Sector
SIP ON
TMP ON
SIP Connections
TMP &
LIU - PSB Ho-H- Injection Meeting 6
Pump down studies: option 2
TMP gate
SIP SIP SIP
Option 2
0 2 4 6 8 1010-8
10-7
10-6
10-5
10-4
10-3
Option 1
P (m
bar)
t (h)
Option 2
The intervention time is about 2 hours more than option 1.
LIU - PSB Ho-H- Injection Meeting 7
Pump down studies: option 3
TMP gate
SIP SIP SIP
Option 2
0 2 4 6 8 1010-8
10-7
10-6
10-5
10-4
10-3
Option 1
P (m
bar)
t (h)
Option 3SIP SIP
Option 3
The intervention time is the same as option 2.
LIU - PSB Ho-H- Injection Meeting 8
Pump down studies: option 4
TMP gate
2X SIP
Option 2
0 2 4 6 8 1010-8
10-7
10-6
10-5
10-4
10-3
Option 1
P (m
bar)
t (h)
Option 4
Option 3
Option 4 The intervention time is the same as option 2.
LIU - PSB Ho-H- Injection Meeting 9
Pump down studies: option 5
TMP gate
SIP
Option 2
0 2 4 6 8 1010-8
10-7
10-6
10-5
10-4
10-3
Option 1
P (m
bar)
t (h)
Option 5
Option 3
SIP
The intervention time is about 30
minutes more than option 1.
Option 4 Option 5
2X 2X
LIU - PSB Ho-H- Injection Meeting 10
Pressure Profile studies : Option 1
The pressure profiles have been studied for these
options after pump down with sector
valves open.
SIP SIP SIP SIP SIPSIP SIP
Position (m)
Read Pressure Point
0
0 2 4 6 8 10 12 14 16 18 20 2210-10
10-9
10-8
P (m
bar)
Position (m)
24 h 100 h -RT 100 h-50C (transient) 100 h -50C (steady state) 1000 h -50C (steady state)
Pressure distribution - Sector Valves as option 1
LIU - PSB Ho-H- Injection Meeting 11
Pressure Profile studies : Option 4
The pressure profiles have been studied for these
options after pump down with sector
valves open, considering the
displacement of 1 of the SIP upstream.
SIP SIP SIP2XSIP SIP
SIP SIP
Position (m)
Read Pressure Point
0
0 2 4 6 8 10 12 14 16 18 20 2210-10
10-9
10-8
P (m
bar)
Position (m)
24 h 100 h -RT 100 h-50C (transient) 100 h -50C (steady state) 1000 h -50C (steady state)
Option 4
LIU - PSB Ho-H- Injection Meeting 12
Pressure Profile studies : Option 5
SIP SIP SIP SIP SIPSIP SIP
Position (m)
Read Pressure Point
0
0 2 4 6 8 10 12 14 16 18 20 2210-10
10-9
10-8
P (m
bar)
Position (m)
24 h 100 h -RT 100 h-50C (transient) 100 h -50C (steady state) 1000 h -50C (steady state)
Pressure distribution - Sector Valves as option 5 - doubling SIP
The sputter ion pumps must be displaced where the sector
valves are: there is space to install a
further pump upstream, but no
space for replacing the downstream one.
LIU - PSB Ho-H- Injection Meeting 13
Pressure Profile studies : Option 1, 4 and 5, comparisons
Position (m)
Read Pressure Point
0
No sublimators taken into account!!
0 2 4 6 8 10 12 14 16 18 20 2210-10
10-9
10-8
P (m
bar)
Position (m)
Option 1 Option 4 Option 5 *2
100 h of pumpdown - 50 C - steady state
LIU - PSB Ho-H- Injection Meeting 14
Intervention probability• Option 1: high risk for the foil integrity and foil mechanical
assembly, high risk for MTV mechanical assembly (high intervention dose).
• Option 3 and 5: same as option 1, more stainless steel surface and dumps and we lose the dump conditioning every time the system is vented to air equal longer time to achieve nominal beam. (less personal dose for pumping and leak detection).
• Option 2 and 4: same as for option 1. More stainless steel surface, but not critical. More space in injector zone (less personal dose for pumping and leak detection) and no loss of the dump conditioning.
LIU - PSB Ho-H- Injection Meeting 15
Conclusions
• The displacement of these sector valves would allow for a safer intervention scenarios.
• It would create a bigger vacuum sectors, which might improve the initial phase of the venting and pumping of the stripping foil mechanism.
• Option 5 allows for doubling the SIP connected on both sides of the stripping foil mechanism, we can maintain the same level of vacuum in the stripping foil, but higher pressure down stream. The dump region will be vented at each intervention and there is a risk it will take longer before we can inject nominal beam.
• Option 4 gives a longer intervention time, but the dump would be protected from venting so shorter time to go to nominal beam and we will accumulate less personal dose.
LIU - PSB Ho-H- Injection Meeting 16
Stripping foil venting – pumpdown testbench
- Injection during pumpdown to slow down the descent in pressure in its initial phase;
- Injection at known different fluxes, checking the foil integrity;
Flowmeter (venting phase)
Injection(Pumpdown phase)
Thanks to Remy et Yves for assembling the foils!!