Spreadsheet: 00086e2c-ca80-4016-b8c5-c32ab86e98d5
Sheet: Sheet1

Tests needed? | # [NAME] units needed | must be in string? | phase | need beam? | risk | homework assigned to | Comments
Test reliability of components. Of particular concern are components with long MTTR such as tuners, piezos, and couplers. |  | n | 0 | n |  |  | with reasonable size test can catch major screw-ups, but can't assure we meet the MTBF goals. Some items can be tested separately with perhaps accelerated tests.  Nobus Vancouver talk has many numbers for this.  May want to build specialized test setups for piezos and couplers and tuners to run them more often and stress them.
Check cryo control (maintain liquid levels, feedback time response etc.) and vibrations due to cryogen flows | 2 to 4 | y | 0 | n |  | himel | Petersons reply posted on Wiki 28Aug06.  XFEL will tell us this in 2012.  TTF tests may already be adequate.  [NAME] should talk to [NAME]
test beam based feedbacks (steering? Energy? Intratrain?) |  | y | 0 | y |  |  | will be done at TTF and is gradient independent
Check for beam losses |  | y | 0 | y |  |  | Can't remember what we meant
Evaluate cavity quench  rates and coupler breakdowns | >1 | n | 1 |  |  | himel | Evaluate [NAME] allowable rate and recovery times
measure dark current (effects cryo load) (including how much is accelerated) and radiation (question for both electronics and people in tunnel with RF on). | ~3 | y | 1 | n |  | kephart | dark current increases factor of 10 per 4 MeV. Poor correlation between vertical test, Horizontal test, and cryomodule.  Need better radiation detectors.  Quads need to be tunable to high energy for this test.  May be simulatible, but may not think of all possible  cases.  There is both captured and not captured dark current
Long term testing of cryomodules to evaluate degradation or other weaknesses before large scale series production begins | >1 | n | 1 | n |  |  | e.g. HOM failures in SNS caused by end wall heating due to field emissions. TTF has seen no degradation
Does thermal cycling degrade a cryomodule (include alignment) | 1 | y | 1 | n |  |  | dedicated test on two cryomodules (to test interconnects). Will be tested by XFEL if we don't change flanges and feedthroughs. Test feedthroughs separately.  Need to decide if use stretched wire or beam to measure motion.
Check both static and dynamic cryo heat loads | 1 | y | 1 | y |  |  | Helps size cryoplant correctly. Might HOMs with beam make heat load.  Need to test this at TTF. It is gradient independent. Beam must have timing and bunch length of ILC
Check for cavity and quad vibration due to use of piezo tuners | 0.33 | n | 1 | n
Check for quad vibration with accelerometer or laser interferometer | 0.33 | y | 1 | n | 5 |  | better to check quad vibrations directly with accelerometer. This will change with different cryomodule designs. May be system issues that require full mockup (vacuum pumps, water pumps). Could messure how much it amplifies ground motion.
Develop RF fault recognition and recovery software.  Insure that adequate instrumentation is available to sense likely faults. (coupler breakdowns, cavity quench, broken tuner motor, broken coupler motor, defective sensor…) | 1 | y | 1 | y
check for trapped HOMs including between the cavities | 1 | y | 1 | y
provide an RF unit for LLRF tests for several years | 1 | y | 1 | y |  |  | need to stress the system which may not be allowed at TTF.
show that we can internationally build this test system | 1 | y | 1 | n
Mock up actual tunnel layout to explore installation,maintenance, and repair issues prior to large scale construction of ILC, could influence civil designs | 2 | y | 1.5 | n
try a dirty vent on some cryomodules and see if things still work | 1 | y | 1.5 | n |  | [NAME], [NAME] | XFEL will test something like this. We should agree on a common design.
Do above with a fast acting valve to see effects both of valve and of the dirty vent | 1 | y | 1.5 | n |  | [NAME], [NAME]
Tight loop cryomodule system: Provide a test bed for evolving industrially produced cryomodules.  Scale is set by preproduction that is ~10% of full scale ILC production per year and desire to test preproduction cryomodules before full production | 7-10? | n | 2 | n |  | kephart | needs more thought
Evaluate performance of enough cryomodules reengineered for manufacturibility and cost reduction to approve changes for mass production |  | n | 2 | n |  | kephart
Is cryomodule instrumentation adequate but not excessive ( ie costly) not BPM |  | y | 2 | n
check for emittance growth due to cavity misalignments | 200 | y | 3 | y | 5 |  | Beam wasn't accelerated to maximize sensitivity
check dispersion effects of following earth's curvature |  | y | 3 | y
Check for emittance growth before and after DFS steering | 10 | y |  | y | 5 |  | 10 RF units is marginal with RF gun.  All cryomodules had a quad to maximize the sensitivity. Also, just 1-1 steering reduces emittance growth to less than we can measure
check beam phase and energy stability | 1 | y |  | y |  | [NAME] | closely related to LLRF test. Requires energy and phase measurements of the beam on ingoing and outgoing beam.  Need to check if we can get the necessary resolution
Provide a reason to build cryomodules that need to be built anyway to get industrialization going |  | n |  | n
KEPHART additions 7/30/06
Understand RF control issues in a system with many cavities and cryomodules distributed over a large physical space |  | y |  | y |  | ross | use long cables for phase reference between 2 RF units, but this could be done w/o RF units. See if there are any other reasons.
Measure x-ray emissions and evaluate adequacy of shielding for personnel protection before mass production of equipment | 1 | n |  | n |  |  | must make the klystron safe
Below added during meeting of 7/31/06 |  |  |  |  |  |  | 1
demonstrate to us and the world that we can make an RF unit to spec.
test transport of cryomodules and mixing those of different regions