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Table 4.1

Table 3.1

Table 3.2 Pre-linacs, Damping Rings and Main Linac Parameters - 1 TeV (c.m.)

Click here	TESLA		SBLC		JLC (C)		JLC (X)	NLC	JLC/NLC**	TBNLC		VLEPP		CLIC
to update your machine information for Table 3.2.	TRC 12/95	Updated* 8/98	TRC 12/95	Updated* 10/96	TRC 12/95	Updated* 9/99	TRC 12/95	TRC 12/95	Updated* 8/98	TRC 12/95	Updated*	TRC 12/95	Updated*	TRC 12/95	Updated* 9/99
Pre-linacs																Pre-linacs
First stage energy (GeV)	4	3.2	3.15		1.98		1.98	2	1.98	2		3		2.15	1.98	First stage energy (GeV)
Second stage energy (GeV)	-		-		20		10-20	10	10	10		-		9		Second stage energy (GeV)
Beam energy to make (GeV)	500	400	500		10		10	6	6	6		150		2.15	1.98	Beam energy to make (GeV)
Damping Rings																Damping Rings
pre-damping ring energy (GeV)	-		-		1.98		1.98	2	1.98	2		-		2.15	1.98	pre-damping ring energy (GeV)
damping ring energy (GeV)	4	3.2	3.15		1.98		1.98	2	1.98	2		3		2.15	1.98	damping ring energy (GeV)
Ring circumference (m)	20,000	17,000	650		321		277	223	300	223		160		283	298	Ring circumference (m)
	20/20		3.8/3.8		3.5/4.3		4/5.2	4.1/4.6	5.1/5.1	4.1/4.6		1.8/2.9		10.5/10.5	13.1/13.1
Number of bunches per ring	2,260	4,500	50		288		340	4 x 75	285	4 x 75		3		72 x 10	8 x 154	Number of bunches per ring
Bunch length (mm)	10	5	4		5		5	4.1	4	4.1		9.8		1.8	3	Bunch length (mm)
	10/.5		10/.5		3/.03		3/.03	3/.03	3/.03	3/.03		45.5/.45		2.5/.04	1.1/.01
Main Linacs																Main Linacs
RF frequency (GHz)	1.3		3		5.7		11.4	11.4	11.4	11.4		14		30		RF frequency (GHz)
Unloaded/loaded gradient (MV/m)	25/25	34/34	42/36		58/47	56/47	73/58	85/63	72.3/55	85/63		100/91		80/78	172/150	Unloaded/loaded gradient (MV/m)
Active two-linac length (km)	40	23	29.4		22.2	21.1	18.2	17	18	17		11.6		12.8	7.2	Active two-linac length (km)
Total two-linac length (km)	58	30	33		26.6		21.8	18.7	20.9	18.7		14		17.6	10	Total two-linac length (km)
Total number of klystrons	1,208	1,232	4,904		6,176	5,864	6,910	9,456	6,624	64		2,800		4	364	Total number of klystrons
Total number of modulators	1,280	1,232	4,904		3,088	5,864	6,910	4,728	3,312	18,912		280		NA	182	Total number of modulators
Klystron peak power (MW)	8		150		100	98.6	135	72	75	38480		150		NA	50	Klystron peak power (MW)
Klystron repetition rate (Hz)	5	3	50		50		150	120	120(100)	120		300		4,000/1,800	150	Klystron repetition rate (Hz)
	1,300		2.8		2.4		.5	1.1	1.55	.3		.5		.0176/.0176	33.3
Pulse compression ratio	1		?		5		2	5	4	1		4.55		NA	32(beam)	Pulse compression ratio
Pulse compression gain	1		?		3.5	3.35	1.96	3.6	3.4	1		3.3		NA	32(beam)	Pulse compression gain
	1,300		2.8		.48		.23	.22	.37	.3		.11		.0116/.0176	.13
Number of sections	38,656	19,712	5,034		12,352	11,728	13,820	9,456	9,934	9,456		11,200		45,772	14,140	Number of sections
Section length (m)	1.04		6		1.8		1.31	1.8	1.8	1.8		1		.280	.5	Section length (m)
a / (range if applicable)	.15		.16/.11		.16/.12		.20/.14	.22/.15	.216/.146	.22/.15		.14		.2	.225/.175	a / (range if applicable)
Total AC power to make rf (MW)	184	132	284		200	133	220	191	200(167)	152		114		275	150	Total AC power to make rf (MW)
Wall plug beam efficiency (%)	17.9	18	4.1		4.4	5.9	6.7	7.9	8.6	20		8.4		1.9/8.5	9.8	Wall plug beam efficiency (%)
Click here	TESLA		SBLC		JLC (C)		JLC (X)	NLC	JLC/NLC**	TBNLC		VLEPP		CLIC
to update your machine information for Table 3.2.	TRC 12/95	Updated* 8/98	TRC 12/95	Updated* 10/96	TRC 12/95	Updated* 9/99	TRC 12/95	TRC 12/95	Updated* 8/98	TRC 12/95	Updated*	TRC 12/95	Updated*	TRC 12/95	Updated* 9/99

*If a number does not appear in the updated column, this means that the number in the TRC column still holds.

**Numbers in ( ) under JLC/NLC correspond to 100 Hz repetition rate; numbers in ( ) under CLIC correspond to a
20% dilution in and 5% in .

The definitions for the TBNLC are somewhat different from the other machines. Each 300 m-long induction linac driver is counted as one klystron. There are 64 such drivers. Each has approximately 300 induction pulse power modules for reacceleration which are counted as modulators. There are two such modules per NLC accelerator section. With the rf pulse length increased to 300 ns, the number of bunches could be increased from 75 to 143, with a corresponding increase in luminosity.

The main linac loaded gradient includes the effect of single-bunch (all modes) and multibunch beam loading, assuming that the bunches ride on crest. Beam loading is based on bunch charges in the linacs, which are slightly higher than at the IP.

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Table 4.1

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This page modifed: October 7, 1999 - 2:00 p.m. PDT - E. Mitchell