phase 1 fpix insertion check with bpix supply tube and new beam pipe

Installation and Beampipe 1

Phase 1 FPIX Insertion Check with BPIX supply tube and new beam pipe

Phase 1 Pixel Upgrade - Aug2012

Kirk Arndt (Purdue)with the help of Silvan Streuli, PSI

for CMS FPIX Mechanical GroupS. Kwan, C.M. Lei, S. Los, G. Derylo (Fermilab)

G. Bolla, D. Bortoletto, I. Shipsey, Y. Ding, V. Noe-Kim, D. Snyder (Purdue)


Simplified model of FPIX upgrade service cylinder (SC) ready for insertion

Simplified model of BPIX upgrade barrel section and Supply Tubes (ST)

New rail extensions required for upgrade FPIX

FPIX SC fully inserted



BPIX supply tubeFPIX SC forward support foot (located at forward end of the stiff, double-walled SC section)

FPIX SC rear support foot



• The end of the BPIX supply tube will be moved outwards by 38mm after installation

• The envelop for the pixels inside the Tracker in a 2007 CAD model (see backup slide) allows the BPIX supply tube to swing out by an additional 7.75mm. Only a test installation at Point 5 can show if this theoretical space is really available.

• It's possible that the heavy cabling at the end of the BPIX supply tube may prevent us from swinging the supply tube by this additional distance.Phase 1 Pixel Upgrade - Aug2012


Insertion position 1o Z = 2525 mmo Minimum Clearance: 3.3 mm 8.9 mm

Note: clearances are listed with BPIX ST backendmoved 38mm 45.75mm



Insertion position 2o Z = 2275 mmo Minimum Clearance: 5.4 mm 7.4 mm



Insertion position 3o Z = 2050 mmo Side Clearance: 5.5 mm 11.6 mmo Minimum Clearance: 1.8 mm 3.8 mm



Insertion position 4o Z = 1630 mmo Minimum Clearance to Beam pipe

support collar 4.9 mm 4.9 mm

4.9mm



Insertion position 5o Z = 1077 mmo Side Clearance: 5.9 mm 8.6 mmo Minimum Clearance: 2.0 mm 2.8 mm



Insertion position 6 = final installed positiono Z = 290.4 mmo Top Clearance: 4.7 mm 4.7 mmo Minimum Clearance: 4.0 mm 4.0 mm



BPIX supply tube

FPIX SC forward support foot (located as far forward as possible)

FPIX SC rear support foot

Moving the front support towards IP

• Option to locate FPIX SC forward support foot as far forward as possible.• This increases the clearance between FPIX and BPIX throughout

installation, and does not change the clearance between FPIX and the beam pipe support collar.



Insertion Position

FPIX clearance to:

FPIX front Z distance from IP

Top/Bottom Clearance

Side Clearance


Side Clearance


Side Clearance

1 BPIX ST 2525 N/A 3.3 N/A 8.9 N/A 6.32 BPIX ST 2275 N/A 5.4 N/A 7.4 6.3 9.03 BPIX ST 2050 1.8 5.5 3.8 11.6 3.0 9.2

4 Beampipe support collar

1630 4.9 4.9 5.0

5 BPIX ST 1077 2.0 5.9 2.8 8.6 5.9 17.36 BPIX ST 290.4 4.7 4.0 4.7 4.0 4.7 4.0

BPIX ST backend moved 38 mm

BPIX ST backend moved 45.75 mm

BPIX ST backend moved 38 mm + FPIX SC support post moved to front


Summary of minimum clearances during phase 1 FPIX insertion


• For FPIX, the beam pipe support collar design is a critical issue, especially when the beam pipe is misaligned!

• The support collar design should be as sleek as possible (see image of an idea shown

below/right). • Some of the beam pipe collar designs proposed in the past are too bulky. A collar with a

length (along beam pipe) of 10mm, but with a thickness of only 1mm (cross section) in the critical area would be ideal.


Installation and Beampipe 14Phase 1 Pixel Upgrade - Aug2012

Minimum clearances as the forward end of upgrade FPIX overlaps the latest beam pipe support collar design

• The closest approach is between the face of the pin in the collar for fastening the vertical support wires and the ends of the inner rings of the half-disks (right-hand picture above)

clearance to the support collar …and to the pin in the support collar


1. Find a rail extension shape that optimizes the FPIX installation = DONE

2. Increasing the inner radii of the BPIX supply tube = not possible…already suffer from very little space to integrate all the necessary components.

3. Modify the outer shape of FPIX = don't see an easy change to the outer shape of the forward end of the new FPIX to create more clearance.

4. Move backend of BPIX supply tube out by an additional 7.75mm = may not be possible, and does little to increase clearance during insertion beyond beam pipe supports.

5. Make the beam pipe support collar design as sleek as possible. 6. Move the FPIX SC front support towards IP = best design option.7. Make the front pins movable (spring loaded?) in case of a contact

between FPIX SC and BPIX ST, so the FPIX SC can move slightly towards the beam pipe…?

Options to increase clearance during insertion of FPIX



Backup slide



Information from Silvan Streuli, PSI – Feb2012


phase 1 fpix insertion check with bpix supply tube and new beam pipe

Documents

mmminimum clearance

upgrade fpixfpix sc

mmside clearance

mmtop clearance

beampipeinsertion position

beampipe12 phase

bpix st

beam pipe collar designs