Machine Detector Interface Workshop: ILC-SLAC, January 6-8, 2005.

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1 Intrnational Linar Collidr Machin Dtctor Intrfac Workshop: ILCSLAC, January 68, Prsntd by Brtt Parkr, BNLSMD Mssag: Tools ar now availabl to optimiz IR layout with compact suprconducting quadrupols in a crossing angl gomtry. 1

2 Intrnational Linar Collidr A Nw and Improvd ILC Compact Quadrupol FF Dsign: Th Outlin. History (Rviw Critical Points). Rcnt Work & Nw Possibilitis. Nar Trm Plans. Y (mm) Main Coils Extraction Lin Coils Our prfrrd compact coil suprconducting option (shown at lft) provids indpndntly adjustabl focusing to both th incoming and xtractd bams and cold masss containd in sparat cryostats. This is achivd by cooling th coils via 1.9 K hlium suprfluid which also may bring othr advantags. X (mm) 2

3 Intrnational Linar Collidr Canonical Compact Suprconducting Final Focus Magnt Dsign. 76 mm T h o r i g i n a l ( c o n s r v a t i v ) c o m p a c t 57 mm suprconducting magnt concpt has nstd coils so that innr bnds ar mad using small diamtr singl strand wir. Also annuli outsid ach coil pack ar usd for in/out cooling flow of prssurizd singlphas (suprcritical 4.5 K) hlium. Extractd bam passs outsid cryostat through fring fild rgion with first (dipol) corrction lmnt at largr L*. Us only 7 strand cabl for bst packing. Compact QD0 Gomtry with L* = 3.8 m & 20 mr xing Angl has xtractd bam passing outsid th cryostat. Considr 1.9 K cooling for bst prformanc. Try to optimiz fild sn by xtractd bam. 3

4 Intrnational Linar Collidr A Motivation for Making QD0 Coil Evn Mor Compact. Not: Both magnts shar common cryostat. Scond solution with QD0 insid compnsator. For normal IR outr magnt has a m uch smallr radius. 4

5 Intrnational Linar Collidr Can w wind 6around1 cabl with much smallr bnd radius? Ida was to try smiautomatic winding with a mchanical assist for th first turn. By th third cornr John Escallir had found procss paramtrs that workd for automatic winding of th rst of th coil (two layrs wr wound). 5

6 Intrnational Linar Collidr Compact Coil Solution: 20 mr Xing Angl and Extraction Lin Focusing. Both magnts includ doubllayr dipol, skw dipol and skw quadrupol corrction coils. Indpndnt Cryostats? 6

7 Intrnational Linar Collidr Compact Coil Solution with Cold Masss in Indpndnt Cryostats. Mik Harrison challngd mchanical nginrs to put th cold masss in indpndnt cryostats. Concpt uss spac abov and blow cold masss for cryognic plumbing and rducs hat lak with longr supports. Furthr away from IP, whr thr is mor spac, mak transition to round cryostats. L* = 3.8 m and 20 mr xing Angl 7

8 Intrnational Linar Collidr Th Nxt Stp: 1.9 K Opration and Singl Layr Corrction Coils. At 1.9 K plan to go from 10 to 6 layrs for main coil. Hav 31 mm (coil to coil) Y (mm) 20 mr x 3.8 m for 76 mm sparation X (mm) Us trick to gt lads out from pols with ovrlapping dipol, skw dipol and skw quadrupol windings. 8

9 Intrnational Linar Collidr For th corrction coils th wiring ordr dos mattr. First wind th dipol layr. Thn wind skw dipol with midplan gap to hav spac to bring out dipol lads. Pols of a skw quadrupol alrady lin up so w can bring out all th lads. Singl layr dipol, skw dipol and skw quadrupol windings. Coil Dtail With this schm w can hav multipl dipol corrctors along th 2 m lngth. 9

10 Intrnational Linar Collidr Concptual Study for Cooling an ILC Compact FF Magnt.* It is possibl kp th IP nd small sinc suprfluid hlium can conduct hat away vn through a small (but nonzro!) annular spac. Thn furthr out from IP w arrang to hat xchang btwn prssurizd hlium and a rducd prssur hlium bath. *K. C. Wu, BNL/SMD Not: 5 K Hat Shild and Control Valvs. Trad off spac for coils for spac for supports and hat shild. Hopfully yilds ovrall bttr dsign. 10

11 Intrnational Linar Collidr What should b don to tailor th xtrnal fild for th xtraction lin? Fild Profils Without Compnsation, L*=3800 mm, 20 mr xing By, Fild at Extraction Lin (Gauss) Tn Layr Solution Six Layr Solution Z, Distanc from IP (mm) Extrnal f ild is r d u c d whn coil is mor compact. Not: For rfrnc canonical dsign has 1160 Gauss max. xtrnal fild. 11

12 Intrnational Linar Collidr What should b don to tailor th xtrnal fild for th xtraction lin? For ths latst compact coils, th pak QD0 xtrnal fild at th xtraction lin is th sam ordr as that from th DID. Extrnal quadrupol with sam L* as QD0 should hlp th xtraction lin prformanc. Dipol and skw dipol coils usd to compnsat momntum dpndnt kicks. Skw quadrupol coil usd to giv an ffctiv roll. Sxtupol coils will b wound in a sparat coil packag. 12

13 Intrnational Linar Collidr Som Important Nar Trm Activitis. Whn winding machin is again availabl aftr BEPCII production, start winding 1 m main quadrupol prototyp (mak it short to b abl to tst in small dwar). Not at 4 K magnt oprating point is clos to 95% short sampl. Mak conductor tst to dtrmin xpctd prformanc at 1.9 K (limitd information on scaling at such low fild). Continu to look at support and cooling schm issus (hand off information to intrstd partis for making a mock up). Intgrat proposd corrction schm into optics dcks (us with DID to control synrad and polarization impacts). Itrat magnt paramtrs to optimiz xtraction lin (to mt xprimntal and acclrator physics goals). 13

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