Feedthroughs for Beam Position Monitors at DESY · 2018. 3. 8. · Non metal Material of OMC...

Silke Vilcins, DESY 116.12.2008 Meeting at ANKA

Feedthroughsfor Beam Position Monitors

at DESYS.Vilcins, MDI


Introduction1. Overview of BPM’s at DESY for different applications and machines

2. Overview of UHV feedthroughs used at DESY during 20 years

3. Issues and aspects of feedthrough design

5. Test procedures and test facilities for BPM’s at DESY

6. Summary

4. An overview of feedthrough suppliers


Overview of BPM’s at DESY for different applications and machines

• Standard BPM’s:– HERA (offline), DORIS III, DESY, LIN II, PIA, PETRA III and FLASH

• Normally in use knob BPM’s and striplines

• Special BPM’s:– FLASH

• BAM (beam arrival monitor), Cavity BPM, resonant striplines, chicane BPM for BC3, reentrant BPM (warm) (Saclay)

• BPM’s operated under special conditions:– FLASH

• Reentrant BPM (cold)(Saclay) installed in ACC1, button BPM for module 8 and the 1,5 GHz Cavity BPM’s in modules 2-6


– HERA BPM’s– A. “Warm” striplines in proton ring

– B. “Cold” striplines in the cryo modules of the proton ring

– C. “Warm” button BPM’s in the interaction regions (south and north)



Photos of a warm stripline BPM in HERA p, taken by

M.Wendt


A PMB feedthrough!

• A. “Warm” striplines


Overview of UHV feedthrough used at DESY during 20 years

• A typical feedthrough from PMB, France

TIG welded into a Conflatflange adapter for cryo tests

A polished cut images from the part

This standard type is a welding version with a 11 mm button diameter


Metal Material of PMB standard feedthroughs:

• Body made from stainless steel, normally 316 L (ANSI), (German 1.4404/1.4435)

• The CTE of 316 L is 14,4 – 16 * 10 -6 K -1 20°C

• Center pin made from molybdenum which has an CTE of 5,2 – 5,5 * 10 -6 K -1 20°C

Non metal Material of PMB standard feedthroughs:

• The isolator is alumina Al2O3, ~ 97% minimum

• The CTE of alumina is 8,5 – 9 * 10 -6 K -1 20°C

Manufacturing process of the feedthroughs:

• Brazing the part together with additives, typical is additives with palladium, BrazeTec SCP 1 or SCP 2 CTE between 17,5 and 22 * 10 -6K -1 20°C




Cross cut of a cold proton BPM in 3D IDEAS

Made by H.P.Gausepohl, MDI

N-Type feedthrough, standard type of KyoceraB. “Cold” striplines


• N type feedthrough from Kyocera (~1990)

Feedthrough type N cross cut


Welded design N type Feedthrough


Metal Material of Kyocera standard feedthroughs:

• Body and conductor made from Fe-Ni-Co Alloy, which called Kovar, Vacon, Vacodil or Permealloy…. and a lot of more

• The CTE of Kovar is 5,0 * 10 -6 K -1 20°C

Non metal Material of Kyocera standard feedthroughs:

• The isolator is alumina Al2O3



• Brazing the part together with additives, with have a CTE between 10 -15 * 10 -6 K -1 20°C




C. “Warm” button BPM’s in the interaction regions


A few more pictures and photos of BPM’s in DORIS III, DESY, PIA and LINAC II


BPM DORIS III

DESY II

DESY designed feedthrough, screw able and welded… 17 mm button diameter, gold plated



• This feedthrough is from the 80’s and was designed by Franz Peters (DESY)

Metallic Material of this DESY feedthrough:

• Body is made from SST, the conductor with the insulator made from Fe-Ni-Co Alloy, which called Kovar, Vacon, Vacodil or Permealloy…. and a lot of more, this part came from FRIATEC as a purchase item.

NO cryo tests!


BPM LINAC II


BPM PIA

Both of them are “warm” BPM’s with PMB standard feedthroughs…as shown before….



BPM’ s for PETRA III

Designed by Annette Brenger, MDI DESY

A DESY designed feedthrough produced by Meggitt, USA

Feedthroughs, standard type from PMB, France


This is a feedthrough designed by DESY and produced by Meggitt, CA USA

Old design, used in this stripline BPM

New more rigid design modified by FEM calculation, with a thread end 1,6 mm, CuBe gold plated, flanges version

Feedthrough design by Maike Siemens, FEM simulation done by Carsten Muhl, MDI DESY

Overview of UHV feedthrough used at DESYduring 20 years


…FLASH stripline BPM’s…BPM “meets” Quad…

Standard BPM’ s for FLASH


A polished cut images from the old flange version from Meggitt


Button array BPM installed in FLASH for electronic tests….

A commercial feedthrough from Meggitt, button diameter 15 mm for welding applications

A polished cut images from the part as shown on the left

BPM’s used for special beam diagnostics



Metal Material of Meggitt feedthroughs:


• The CTE of 304LN/316 L is 14,4 – 16 * 10 -6 K -1 20°C


Non metal Material of Meggitt feedthroughs:




• Thermal heat assembling in a continuous heating furnace



Testadapter for welding test


High resolution BPM prototype for XFELTest facility for the XFEL Cavity BPM,

frequency 4,4 GHz, first prototype


Cross cut through N – Type feedthrough from OMC

…used a new N-type feedthrough designed by Dr Shintake, produced by OMC, Japan

XFEL prototype Cavity feedthrough



Non metal Material of OMC feedthroughs:

• The isolator is glass

• The CTE of glass is between 3,2 to 3,5 * 10 -6 K -1 20°C


Metal Material of OMC feedthroughs:


• The CTE of 316 L is 14,4 – 16 * 10 -6 K -1 20°C

• Center pin made from Kovar (NiFe) which has an CTE of ~ 5,0 * 10 -6 K -120°C


• Thermal heat assembling in a continuous heating furnace



Old design, used in this resonant stripline BPM

Resonant stripline, concept and RF calculation by Micha Dehler, PSI, design by Maike Siemens, DESY

Prototype of a resonant stripline BPM


BPM’s under special conditions


Cross cut through the reentrant BPM from SACLAY

…photo…

…installed in FLASH …and in one cryo module in FLASH!



Cross cut through the SACLAY reentrant feedthrough, produced by Solutions in Ceramic Technologies (SCT), France and PMB, France

Photo, cut out from web side of SCT, France

Drawing done by SACLAY

3D CAD picture done by SACLAY



BPM’s under special conditionsFirst prototype feedthrough designed by DESY, produced

by PMB, France, flange version with a 8 mm gold plated button. This feedthrough is not designed

exclusive for cold applications!

…installed in cryo module 8 for FLASHBody design courtesy by Nils Mildner, MVS DESY


Metal Material of PMB feedthroughs:


• The CTE of 304LN/316 L is 14,4 – 16 * 10 -6 K -1 20°C


Non metal Material of PMB feedthroughs:







Overview of UHV feedthrough used at DESYduring 20 years

Materials: SST, Al2O3 ceramic, maybe molybdenum center pin…

Responsible for this BPM’s is Christian Boccard, CERN

Prototype feedthrough designed at CERN, produced by BPM, France, flange version with a 24 mm button,

used in the modules of LHC

Feedthrough from another labs…


Issues and aspects of feedthrough design

•Design specs:

–Develop/Use feedthrough adapted to the requirements (accepted to the working environments)

•Working environments (warm, cold, high voltage or low current)–Feedthroughs for 2K / 4K working temperatures or for 330K or higher are different…–Welding or flange version possible…

•Flange version: easy cleaning, easy mounting, easy removable, but expensive•Welding version: less cleanable, no removable, no mounting, but cheaper

–Space requirement for the BPM….–Accuracy and resolution of the BPM are responsible of BPM’s–Bunch current, front end, electronic design have impact on the button diameter



•Design specs:

–FEM simulations are sometimes helpful, but they are not easy for cryogenic applications and need time–RF simulations are necessary for the RF parameter, but they also need time and experience–Ultra high vacuum requirements –also beampipe diameter–Quantity: a few or many–Total costs, mechanic and electronic…–Time of development…



What type of seal for cold applications?

Courtesy by VAT

First picture shows standard gasket for a lot of UHV application, most of them are static seal

Second picture shows special gasket for big diameters up to DN 250 and useful if knife edges are damaged

Third picture shows special gasket use with clamps, in high radiation areas, called “Helicoflex” seal for static applications

Fourth picture shows special gasket in synchrotrons, while the distance between flange to flange is very short, therefore good RF properties

The last two pictures shows new designs for dynamic seals, VAT find a combination of copper pad and knife edge (soft on hard) or the VATRING system (hard on hard)….we will tested in the future…



•Design specs:–For a flanged version it is essential, if the working environment is cold! This decides the type of gasket.

•Under cold conditions you have to have space between the mounted flanges, therefore you have a stable configuration if you change from room temperature to cold conditions (called: spring loading effect)•compression forces always at the limit from elastic to plastic/non elastic deformation


Cross cut through the new

feedthrough for the cold XFEL

reentrant BPM of SACLAY

Saclay prefer at this moment a copper Conflat gasketgasket

This principle called “soft on hard”

Cross cut through a Conflat

flange/flange,




Flange material mostly SST, sometimes titanium, seal material is OFHC copper, sometimes silver plated

“soft on hard” principle




Flange material mostly SST, aluminum or titanium, seal material is a spring in a housing of aluminum

BPM feedthrough for cold BPM at LHC, used Helicoflex gaskets

Also “soft on hard” principle



•Design specs:–For a flanged version it is essential, if the working environment is cold, because you have to choose the type of gaskets

•Under cold conditions you have to have space between the mountedflanges, therefore you have a stable configuration if you change from room temperature to cold conditions (called: spring loading effect)•compression forces always at the limit from elastic to plastic/non elastic deformation

The diagram and FEM analysis done by Paolo Michelato, INFR


feedthrough for the cold XFEL BPM, DESY

design




Which kind of gasket for cold applications?


feedthrough for the cold XFEL BPM, DESY

design

Courtesy by Maike Siemens, MDI DESY



The new DESY design for a XFEL cold feedthrough

Photo of one XFEL prototype feed through (from PMB and St. Gobain), to be used as prototypes for cryogenic tests

There are still new developments for seals, also special for cryogenic environments. Make tests!

Special gasket, used at DESY for cryoapplication, called diamond edge


Metallic Material of PMB and St.Gobain feedthroughs:

• Body made from titanium

• The CTE of titanium is 10,8 * 10 -6 K -1 20°C


Non metallic Material of PMB and St.Gobain feedthroughs:








ConclusionsRequirements:

- Leak tight

- Low out gassing rate, low desorption

- Low permeation of light gases

- Sometimes bake-able

- Reliable

- Long term radioactivity resistance

- Flexible to temperature change (spring loading effect)

AND:

- Repeated reliable sealing or

- Transfer of movement from atmosphere to vacuum

There are still new developments for seals, also special for cryogenic environments. If you have time, make tests!


A overview of feedthrough suppliers

•Companies:–PMB: http://www.pmb-alcen.com/, France, contact person: Mr. Focke

–Kyocera: http://www.kyocera.de/index/products/ultra_high_vacuum_products.html, Germay, Japan, contact person: Mr. Behrens

–OMC: http://www.orient-microwave.com/english/products.html, Japan, in Germany over SEMIC http://www.semic.de/de/ contact person: Mr. Gruber

–St.Gobain: http://www.solcera.com/, France, contact person: Mr. Tiesse

–Meggitt: http://www.meggittsafety.com/co_contact.asp, USA, contact in Germany over Globes http://www.globes.de/ Mr. Gothmann, Norderstedt

–SCT: http://www.sct-ceramics.com/, France, no contact person, maybe over Claire Simon CEA SACLAY

http://www.kyocera.de/index/products/ultra_high_vacuum_products.html

http://www.orient-microwave.com/english/products.html

http://www.semic.de/de/

http://www.solcera.com/

http://www.meggittsafety.com/co_contact.asp

http://www.globes.de/


A overview of feedthrough suppliers

•Companies:–OMLEY: http://www.omley.com/, I have no contact, but Mr. Möllerfrom DESY, OMLEY work together with Brookhaven for HOM probes under cryogenic environments

–Ceramaseal: http://www2.ceramtec.com/Index_Static.cfm, I have no experience, but PSI Switzerland has some….

http://www.omley.com/

http://www2.ceramtec.com/Index_Static.cfm


Test procedures and test facilities for BPM’s at DESY

This photos shows a small leakage detector, use in hall 3 located near by Cryostat 3

The photos on the right shows a bigger leakage detector, use in our machine shop (1*10 -9 mbar*l/(sec)



The photos from left to right shows ultrasonic bath #1, then #2 then the rinsing bath and

down the heater and the mounting area with particle measurements, leakage detector

(out) and mass spectrometer

Clean Room Facility at DESY, located in buld.55 MVSParticle Cleanliness is essential for superconducting RF



This photos shows the rinsing procedure, the mounting of FLASH striplines, a MDI colleague mounting the striplines and a sketch from the

rinsing room



Cryostat 3 a handmade cross cut

Testadapter for cryogenic tests in Cryostat 3

Photo of the open Cryostat 3 at DESY hall 3,

responsible DESY group MKS



This photo shows a test adapter for Cryostat 2 used for a series acceptance test of feedthroughs, e.g. for HOM probes



Screen shot during a test run from 330 K to 4,5 K liquid helium, 10 cycles (cold 30 min/warm~30min).

A continuous leak check during the test cycles show if there is a broken feedthrough or a leak seal. This procedure is controlled by a PC.

First cycle, second cycle, third cycle…

Break, stop of the temperature measurement with a PT 100

temperature

Start at 330 K

time


Summery

Material and design for the BPM body:• Use SST for welded and flanged versions. The material has to be agree to the German “TÜV” standard for “high pressure facilities” (Druckbehälterrichtlinie: Merkblatt AD W10), only for cold applications!

•The SST has to be ESU melted, forged and with reduced the nonmetal contents (phosphor, sulfur and silicium)

•but an increased nickel part (< 13 %)

•Choose materials with a suitable CTE with respect to each other

•Use titanium flanges (feedthrough) for flanged versions

Material for the feedthroughs:• Use SST or titanium, molybdenum, glass, oxideceramic or composition of both, respect to CTE of the choosing material, we prefer to use a filler material for feedthroughs use under cold conditions


Summery

Material and design of the seal:• We prefer using a diamond knife edge gasket, made of aluminum (AlMgSi 0,5 HRC 60), specified by the cryogenic group MKS. MKS use this type of gasket for the cavity flange connection and all flange connection within the beam pipe of XFEL cryomodules

•FEM simulation from P.Michelato shows a positive result

•We will start a FEM simulations with our concept in January 09, end mid of February

Design for the feedthroughs:• We have chosen a flanged version, due to the requirements of particle free cleaning

Manufacturing process of feedthroughs :• We prefer brazing with filler (additives) materials. They provide some flexibility during temperature changes between the different materials in of a feedthrough

•Use a fillermaterial with a wide CTE range


Summery

Special testing procedures of feedthroughs :• Yes, because it’s very important to avoid leakage during operation time

• With a cold test procedure you select out the failures in the feedthrough material and the manufacturing process. You increase the lifetime cycle of the feedthrough


Thank you very much for you attention!

Feedthroughs for Beam Position Monitors at DESY · 2018. 3. 8. · Non metal Material of OMC...

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