D. Peterson, “LC-TPC LP endplate”, LC-TPC group meeting at ALCPG07, 21-October-2007 1 Discussion for the LP endplate See also:

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D. Peterson, “LC-TPC LP endplate”, LC-TPC group meeting at ALCPG07, 21-October Discussion for the LP endplate See also: This project is supported by the US National Science Foundation (LEPP cooperative agreement) and an LCDRD consortium grant D. P. Peterson Cornell University, Laboratory for Accelerator-based ScienceS and Education

D. Peterson, “LC-TPC LP endplate”, LC-TPC group meeting at ALCPG07, 21-October Drawing from DESY , Changed to 9.4mm to center band 5 at 28.0mm.

D. Peterson, “LC-TPC LP endplate”, LC-TPC group meeting at ALCPG07, 21-October Endplate/band geometry (3GEM+G) mm stay clear

D. Peterson, “LC-TPC LP endplate”, LC-TPC group meeting at ALCPG07, 21-October Endplate/band geometry (3GEM=G) Changed to 3.2 mm board

D. Peterson, “LC-TPC LP endplate”, LC-TPC group meeting at ALCPG07, 21-October Endplate Drawings, Endplates drawings were prepared for sending to vendors and preliminary quotes Missing: gas holes skirt holes fun holes The missing items will not significantly affect evaluation by potential vendors.

D. Peterson, “LC-TPC LP endplate”, LC-TPC group meeting at ALCPG07, 21-October Endplate Drawings,

D. Peterson, “LC-TPC LP endplate”, LC-TPC group meeting at ALCPG07, 21-October Endplate Drawings,

D. Peterson, “LC-TPC LP endplate”, LC-TPC group meeting at ALCPG07, 21-October Endplate Drawings,

D. Peterson, “LC-TPC LP endplate”, LC-TPC group meeting at ALCPG07, 21-October Endplate Drawings,

D. Peterson, “LC-TPC LP endplate”, LC-TPC group meeting at ALCPG07, 21-October Endplate Drawings,

D. Peterson, “LC-TPC LP endplate”, LC-TPC group meeting at ALCPG07, 21-October Endplate Drawings,

D. Peterson, “LC-TPC LP endplate”, LC-TPC group meeting at ALCPG07, 21-October Endplate Drawings,

D. Peterson, “LC-TPC LP endplate”, LC-TPC group meeting at ALCPG07, 21-October Endplate Drawings,

D. Peterson, “LC-TPC LP endplate”, LC-TPC group meeting at ALCPG07, 21-October Endplate Drawings, While the endplate drawings are being sent to outside vendors, a series of module back-frames will be made in the Cornell shop. a total of 4 back-frames, 2 for Micromegas, pad board 3.2mm, 2 for GEM I need up-to-date information on the need of GEM. Currently I planned for 18mm of material: 2mm pad board, 3x 2mm GEM, 10mm Gate. In the absence of firm numbers, I am producing back-frames for 8mm material. (They can be re-machined, but they may warp.) This will be the full process: 75m oversize liquid N 2 stress relief 25m oversize liquid N 2 stress relief final cut

D. Peterson, “LC-TPC LP endplate”, LC-TPC group meeting at ALCPG07, 21-October Endplate Drawings,

D. Peterson, “LC-TPC LP endplate”, LC-TPC group meeting at ALCPG07, 21-October Stress relief test piece This shows the first in a series of “stress relief test pieces”. This has been cut with a center opening of 30cm wide. The “mullions” are the same size as proposed in the endplate drawing: 18mm at the widest width, 14mm in depth. This is the first baseline part, with no stress relief. It has been fully measured on a CMM. The mullion position is distorted upward by 500  m (0.020inch). The part was revised to have the strengthening section as shown in the current endplate.

D. Peterson, “LC-TPC LP endplate”, LC-TPC group meeting at ALCPG07, 21-October Stress relief test piece A close-up of the part shown in the previous slide.

D. Peterson, “LC-TPC LP endplate”, LC-TPC group meeting at ALCPG07, 21-October Machining a Stress Relief Test Piece, Motivation: A position tolerance of <25  m is needed for the modules to decouple the calibration of the magnetic field from the position calibration of the modules. I am trying to provide, at delivery, <25  m position tolerance of the mullions. The endplate will then be evaluated after some service time to determine the ability to maintain this tolerance. The program: 6 plates are being made to the revised drawing. A multi-step production is used: 1) machine to 1000  m oversize 2) machine to 750  m oversize, 3) stress relief 4) machine to 250  m oversize, 5) stress relief 6) machine to drawing dimensions Stress relief processes: 2 plates - (3)heat to 325F, (5)heat to 650F 2 plates - rapid cooling to liquid N 2 2 plates - ultrasonic cleaner, 6 hours

D. Peterson, “LC-TPC LP endplate”, LC-TPC group meeting at ALCPG07, 21-October Coordinate Measuring machine ( CMM ),

D. Peterson, “LC-TPC LP endplate”, LC-TPC group meeting at ALCPG07, 21-October CMM, , Z measurements y x Example of measurement after the 2 nd machining. Units are milli-inch inch = 25.5  m This is the Z view. There is a 30  m bowing in z-x. There is a twist about x from left to right of 25  m.

D. Peterson, “LC-TPC LP endplate”, LC-TPC group meeting at ALCPG07, 21-October CMM, , y measurements Example of measurement after the 2 nd machining. Units are milli-inch inch = 25.5  m This is the y view. There is a 30  m bowing in y of the indicated mullion. y x

D. Peterson, “LC-TPC LP endplate”, LC-TPC group meeting at ALCPG07, 21-October Endplate loading A test piece was loaded with 5 kg, 2.6millibar The center of the longest span deflected by 7 m.

D. Peterson, “LC-TPC LP endplate”, LC-TPC group meeting at ALCPG07, 21-October Gas Seal test, Test of the o-ring seal. It can be mounted either way. - model of mullion - back-frame - clamping bracket improved box seal improved module seal test of blank plate

D. Peterson, “LC-TPC LP endplate”, LC-TPC group meeting at ALCPG07, 21-October Gas Seal test, After 1 week, pressure changed from 20.1 inch water (~40 millibar) to 13 inch water Calculate: leak rate through module seal = 0.13 cc/hour (After another 8 weeks, the pressure has dropped to ~ 8 inch water, a much lower leak rate. The seal does not require pressure.)

D. Peterson, “LC-TPC LP endplate”, LC-TPC group meeting at ALCPG07, 21-October decisions Bolt size: (I propose 8mm, DESY proposes 5mm) I have ordered parts, as used in the gas seal test, with (5mm x 0.8mm) and (6mm x1mm) threads. Tests of torque to make the seal will follow. The proposed self tapping insert will require more a larger insert hole, limiting mounting screws to 5mm.

D. Peterson, “LC-TPC LP endplate”, LC-TPC group meeting at ALCPG07, 21-October decisions O-rings 4 surface contact 2 surface contact

D. Peterson, “LC-TPC LP endplate”, LC-TPC group meeting at ALCPG07, 21-October schedule I will know more about the schedule after first discussions with vendors.