Vendors for parts
Ionization Chamber material
Modern Plastics
Source of Ertalyt and G10/FR4 plastic sheets
Address: 676 Howard Ave, Bridgeport, CT, 06605-0574
Phone: (203) 333-3128 / (800) 243-9696
sales reps: Vicky Rivera vrivera@modernplastics.com
Some previously used materials:
Ertalyte, PET NAT PET-P Plate natural
G10/FR4
Rohacell
was a company at Degussa.com
now it is called evonik http://www.evonik.com/en/index.html
http://www.rohacell.com/en/performanceplastics8344.html
Phone # 870 234 0286
The rohacell below was very thick and sturdy. Perhaps it can make a good lightweight chamber. It is not conducting so be carful of charge up effects. Rohacell 110 WF , CMS 01, Rev. G. Type 4 Grade B
Kapton windows
Gas connectors
Legris quick connect
This connector takes a 1/4 OD input hose and has a 5/32 OD output tube which is glued into the GEM detector
Gas Gaskets
Buna-N® A DuPont Dow Elastomers registered trademark brand name of a type of elastomer seal; butyl material which has excellent resistance to gas permeation; an early vacuum seal, generally displaced by Viton®.
http://www-hades.gsi.de/mdc/literatur/outgassing.ps
http://www.vacuumlab.com/Articles/Gas%20Loads%20and%20O-Rings.pdf
Permeation Rates for Air
BUNA-N =
VITON =
"The fact that Viton has an air permeation rate that is one order of magnitude lower than Buna-N shows one reason why it is used more and more often in high vacuum systems even though Buna-N's resiliency, as evidenced by the bounce test, makes it easier to achieve a leak-free seal. "
http://www.vacuumlab.com/Articles/Gas%20Loads%20Elastomer-Metal%20Seals.pdf
Marco Rubber
Vendor Contact
Marco Rubber & Plastic Products, Inc. 334 Clark Street North Andover, MA 01845 USA Telephone: 800-775-6525 Fax: 978-688-6915
O-ring design
http://www.marcorubber.com/gd-directory.htm
For example:
another vendor
http://www.allorings.com/material_selection.htm
candidate part numbers
Gasket Cord: part# CB1000-2.36 ; a 2.36 outer diameter O-ring cord which we can use to make O-rings. The O-grin groove should be 1.77 mm deep and you can use superglue to joing the ends of the cord.
Specifications
Compound# Color Hardness Shore A Tensile Mpa (Psi) Elongation % 22Hr C/S @ 100C Low Temp High Temp B1000 Black 70 15.0 (2,150) 400 10 –40°C(–40°F) 120°C(248°F)
- Buna-N is available in a wide range of Durometers and Colors,
Calculating the gaskets min radius of curvature
( inches)
- where
- R= radius of curvature in inches
- C= 1/2 the thickness of the material
- E= modulus of elasticity
- S= maximum fiber stress of yield stress of the material
Example for Buna-N
C = 2.36 mm/2
E= Elongation/Tensile = 4/2150 (1/psi)
S =?
Copper Clad Kapton
1.) Gus Gustafson DuPont Flexible Circuit Materials 14 T. W. Alexander Drive Research Triangle Park, NC 27709 Phone: 919-248-5280
AP7156E: 2 mil (50 micron kapton, 9 mil double sided copper. Need to etch the copper off of one side.
2.) Digikey; Copper foil tape. You can put a layer of kapton on the sticky side to prevent it from outgassing too much
Item # 3M1194D-1FT-ND
wave soldering
Connectors
SHV Panel Bulkhead
Kings solder SHV Bulkhead Receptacle, Kings Part # 1707-1 File:Kings1707-1 DESIGN.pdf
Kings Electronics
1685 Overview Drive
Rock Hill, SC 29730
Toll Free: 1-888-909-5551
Switchboard: 1-803-909-5000
Min order is 1000 pieces = $1300
Astrix can do smaller orders
818-381-8353 ask for Monique
BNC Female Panel Bulkhead
File:Amphenol BNC Panel Bulkhead.pdf
VFAT input connector
Panasonic P5KS 130 pin surface mount 6.5 mm mated heigth, 0.5 mm narrow pitch
https://panasonic-denko.co.jp/ac/e/control/connector/base-base/p5ks/attention/index.jsp
File:VFAT header inputconnector.pdf
http://panasonic-denko.co.jp/ac/e/control/connector/base-base/p5ks/index.jsp
Precidip Connector
20 pin single row 1.27 mm pitch connectors for back of 10 x 10 cm GEM charge collector
http://www.westfield.co.uk/tp/html/13.html straight pin: 850-90-020-10-001
socket connector : 851-91-020-10-001
http://www.westfield.co.uk/tp/html/13.html
Gas Flow
Filters
Swagelok Filters: Buy the Tee model so its easier to change filters. Model SS-4FT2-05 is a 0.5 micron filer shown below (~$150).
Filter elements are model number SWG ELEMENT and are about $7.14 each.
hoses
connectors
http://www.swagelok.com/search/find_products_home.aspx?SEARCH=/id-10000007/type-1
Chain and plug
part number 922:
http://www.westernenterprises.com/enterprises/fit_chain.php#
stainless steel tubing
http://www.coleparmer.com/catalog/product_view.asp?sku=3468060
8 ft line http://www.swagelok.com/search/product_detail.aspx?part=SS-FL4TA4TA4-96
http://www.swagelok.com/search/find_products_home.aspx?SEARCH=/id-10002236/type-1
Flexible tubing (pigtail)
Prices increase 5 fold if you want a completely stainless steel system. The cheap hoses come with brass connectors on the end.
Our local vendor (Praxair) is willing to special order swagelok parts in addition to using their standard vendor, Western Enterprises.
Praxair suggest the following part number from Western Enterprises
Pigtails : HPF-4-36 (Brass ends $30 for 3') and PF2-4-36 (stainless steel ends $163 for 3')
http://www.westernenterprises.com/enterprises/pigtails_flexible.php
flow meter
Matheson Flow tube # U203 (0.1-1) or U204 (0.2-2)
GEM detector volums 10 cm x 10 cm x 5 cm = 500 = 0.5 Liters
LHC Ar/Co2 (93/7 mix) high rates suggest a gas volume change every 10 hours http://vci.oeaw.ac.at/2001/talks/Tuesday/Aleksa.pdf
CDF Ar/ethane (50/50 mix) did one volume change every 30 hours http://www.slac.stanford.edu/pubs/icfa/spring05/paper1/paper1.pdf
SLAC (75% CO2, 21% Argon, 4% Isobutane, and 0.2% water mix) did 1 volume change every 10 hours , IEEE TRANSACTIONS ON NUCLEAR SCIENCE, VOL. 42, NO. 4, AUGUST 1995
BaBAR: The drift chamber represents a volume of 5m3 filled with a gas mixture of 80% Heand 20% C4H10. Gas will flow at approximately 15 l/min, giving one volume change every 5 to 8 hours.
A GEM detector volume change every 10 hours would need a flow meter capable of 0.05 Liters per hour (0.0017 /hr) measurement .
Media:Microcalibrator_for_DC.pdf this meter goes from 0 to 20 liter/min,probably accurate to 0.1 l/hr flow rate (want a factor of 2 lower flow rate measurement capability may be able to set for 1 volume change every 5 hours)
This flow meter can detect a volume change every 1/10 hour (0.2 ft^3/h) http://www.swagelok.com/search/product_detail.aspx?part=VAF-M1-01S-1-0
A glass tube VA flow meter goes down to 0.3 L/hr (a factor of 10 too high) GTF 1 CHD-B5-100 cm^3 /min http://www.roxspur.com/flow/glassva/1111.pdf
Probably won't be able to get a gas flow meter for the GEM.